--- _id: '52700' abstract: - lang: eng text: 'We explore the polarization hysteretic behaviour and field-dependent permittivity of ferroelectric-dielectric 2D materials formed by random dispersions of low permittivity inclusions in a ferroelectric matrix, using finite element simulations. We show how the degree of impenetrability of dielectric inclusions plays a substantial role in controlling the coercive field, remnant and saturation polarizations of the homogenized materials. The results highlight the significance of the degree of impenetrability of inclusion in tuning the effective polarization properties of such ferroelectric composites: coercive field drops significantly as percolation threshold is attained and remnant polarization decreases faster than a linear decay.' author: - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko - first_name: Pious Mathews full_name: Mulavarickal Jose, Pious Mathews last_name: Mulavarickal Jose - first_name: Henna full_name: Farheen, Henna last_name: Farheen - first_name: Shafaq full_name: Ejaz, Shafaq last_name: Ejaz - first_name: Christian full_name: Brosseau, Christian last_name: Brosseau - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Myroshnychenko V, Mulavarickal Jose PM, Farheen H, Ejaz S, Brosseau C, Förstner J. From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops. Physica Scripta. 2024;99(4):045952. doi:10.1088/1402-4896/ad3172' apa: 'Myroshnychenko, V., Mulavarickal Jose, P. M., Farheen, H., Ejaz, S., Brosseau, C., & Förstner, J. (2024). From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops. Physica Scripta, 99(4), 045952. https://doi.org/10.1088/1402-4896/ad3172' bibtex: '@article{Myroshnychenko_Mulavarickal Jose_Farheen_Ejaz_Brosseau_Förstner_2024, title={From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops}, volume={99}, DOI={10.1088/1402-4896/ad3172}, number={4}, journal={Physica Scripta}, publisher={IOP Publishing}, author={Myroshnychenko, Viktor and Mulavarickal Jose, Pious Mathews and Farheen, Henna and Ejaz, Shafaq and Brosseau, Christian and Förstner, Jens}, year={2024}, pages={045952} }' chicago: 'Myroshnychenko, Viktor, Pious Mathews Mulavarickal Jose, Henna Farheen, Shafaq Ejaz, Christian Brosseau, and Jens Förstner. “From Swiss-Cheese to Discrete Ferroelectric Composites: Assessing the Ferroelectric Butterfly Shape in Polarization Loops.” Physica Scripta 99, no. 4 (2024): 045952. https://doi.org/10.1088/1402-4896/ad3172.' ieee: 'V. Myroshnychenko, P. M. Mulavarickal Jose, H. Farheen, S. Ejaz, C. Brosseau, and J. Förstner, “From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops,” Physica Scripta, vol. 99, no. 4, p. 045952, 2024, doi: 10.1088/1402-4896/ad3172.' mla: 'Myroshnychenko, Viktor, et al. “From Swiss-Cheese to Discrete Ferroelectric Composites: Assessing the Ferroelectric Butterfly Shape in Polarization Loops.” Physica Scripta, vol. 99, no. 4, IOP Publishing, 2024, p. 045952, doi:10.1088/1402-4896/ad3172.' short: V. Myroshnychenko, P.M. Mulavarickal Jose, H. Farheen, S. Ejaz, C. Brosseau, J. Förstner, Physica Scripta 99 (2024) 045952. date_created: 2024-03-21T10:34:48Z date_updated: 2024-03-21T10:40:51Z ddc: - '530' department: - _id: '61' - _id: '230' doi: 10.1088/1402-4896/ad3172 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2024-03-21T10:39:32Z date_updated: 2024-03-21T10:39:32Z file_id: '52701' file_name: 2024-03 Myroshnychenko - Physica Scripta - From Swiss-cheese to discrete ferroelectric.pdf file_size: 5386508 relation: main_file file_date_updated: 2024-03-21T10:39:32Z has_accepted_license: '1' intvolume: ' 99' issue: '4' keyword: - tet_topic_ferro language: - iso: eng oa: '1' page: '045952' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Physica Scripta publication_identifier: issn: - 0031-8949 - 1402-4896 publication_status: published publisher: IOP Publishing status: public title: 'From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops' type: journal_article user_id: '158' volume: 99 year: '2024' ... --- _id: '48599' abstract: - lang: eng text: AbstractThe biexciton‐exciton emission cascade commonly used in quantum‐dot systems to generate polarization entanglement yields photons with intrinsically limited indistinguishability. In the present work, it focuses on the generation of pairs of photons with high degrees of polarization entanglement and simultaneously high indistinguishability. It achieves this goal by selectively reducing the biexciton lifetime with an optical resonator. It demonstrates that a suitably tailored circular Bragg reflector fulfills the requirements of sufficient selective Purcell enhancement of biexciton emission paired with spectrally broad photon extraction and twofold degenerate optical modes. The in‐depth theoretical study combines (i) the optimization of realistic photonic structures solving Maxwell's equations from which model parameters are extracted as input for (ii) microscopic simulations of quantum‐dot cavity excitation dynamics with full access to photon properties. It reports non‐trivial dependencies on system parameters and use the predictive power of the combined theoretical approach to determine the optimal range of Purcell enhancement that maximizes indistinguishability and entanglement to near unity values, here specifically for the telecom C‐band at 1550 nm. author: - first_name: David full_name: Bauch, David last_name: Bauch - first_name: Dustin full_name: Siebert, Dustin last_name: Siebert - first_name: Klaus full_name: Jöns, Klaus id: '85353' last_name: Jöns - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Stefan full_name: Schumacher, Stefan id: '27271' last_name: Schumacher orcid: 0000-0003-4042-4951 citation: ama: Bauch D, Siebert D, Jöns K, Förstner J, Schumacher S. On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs. Advanced Quantum Technologies. Published online 2023. doi:10.1002/qute.202300142 apa: Bauch, D., Siebert, D., Jöns, K., Förstner, J., & Schumacher, S. (2023). On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs. Advanced Quantum Technologies. https://doi.org/10.1002/qute.202300142 bibtex: '@article{Bauch_Siebert_Jöns_Förstner_Schumacher_2023, title={On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs}, DOI={10.1002/qute.202300142}, journal={Advanced Quantum Technologies}, publisher={Wiley}, author={Bauch, David and Siebert, Dustin and Jöns, Klaus and Förstner, Jens and Schumacher, Stefan}, year={2023} }' chicago: Bauch, David, Dustin Siebert, Klaus Jöns, Jens Förstner, and Stefan Schumacher. “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs.” Advanced Quantum Technologies, 2023. https://doi.org/10.1002/qute.202300142. ieee: 'D. Bauch, D. Siebert, K. Jöns, J. Förstner, and S. Schumacher, “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs,” Advanced Quantum Technologies, 2023, doi: 10.1002/qute.202300142.' mla: Bauch, David, et al. “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs.” Advanced Quantum Technologies, Wiley, 2023, doi:10.1002/qute.202300142. short: D. Bauch, D. Siebert, K. Jöns, J. Förstner, S. Schumacher, Advanced Quantum Technologies (2023). date_created: 2023-11-03T10:07:38Z date_updated: 2023-12-21T10:41:17Z department: - _id: '61' - _id: '230' - _id: '429' - _id: '623' doi: 10.1002/qute.202300142 keyword: - tet_topic_qd language: - iso: eng main_file_link: - open_access: '1' url: https://onlinelibrary.wiley.com/doi/10.1002/qute.202300142 oa: '1' project: - _id: '173' grant_number: '231447078' name: 'TRR 142 - C09: TRR 142 - Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen (C09*)' - _id: '167' grant_number: '231447078' name: 'TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)' - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Advanced Quantum Technologies publication_identifier: issn: - 2511-9044 - 2511-9044 publication_status: published publisher: Wiley related_material: record: - id: '43246' relation: earlier_version status: public status: public title: On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs type: journal_article user_id: '158' year: '2023' ... --- _id: '43246' abstract: - lang: eng text: The biexciton-exciton emission cascade commonly used in quantum-dot systems to generate polarization entanglement yields photons with intrinsically limited indistinguishability. In the present work we focus on the generation of pairs of photons with high degrees of polarization entanglement and simultaneously high indistinguishibility. We achieve this goal by selectively reducing the biexciton lifetime with an optical resonator. We demonstrate that a suitably tailored circular Bragg reflector fulfills the requirements of sufficient selective Purcell enhancement of biexciton emission paired with spectrally broad photon extraction and two-fold degenerate optical modes. Our in-depth theoretical study combines (i) the optimization of realistic photonic structures solving Maxwell's equations from which model parameters are extracted as input for (ii) microscopic simulations of quantum-dot cavity excitation dynamics with full access to photon properties. We report non-trivial dependencies on system parameters and use the predictive power of our combined theoretical approach to determine the optimal range of Purcell enhancement that maximizes indistinguishability and entanglement to near unity values in the telecom C-band at $1550\,\mathrm{nm}$. author: - first_name: David full_name: Bauch, David last_name: Bauch - first_name: Dustin full_name: Siebert, Dustin last_name: Siebert - first_name: Klaus full_name: Jöns, Klaus id: '85353' last_name: Jöns - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Stefan full_name: Schumacher, Stefan id: '27271' last_name: Schumacher orcid: 0000-0003-4042-4951 citation: ama: Bauch D, Siebert D, Jöns K, Förstner J, Schumacher S. On-demand indistinguishable and entangled photons at telecom frequencies using tailored cavity designs. Published online 2023. apa: Bauch, D., Siebert, D., Jöns, K., Förstner, J., & Schumacher, S. (2023). On-demand indistinguishable and entangled photons at telecom frequencies using tailored cavity designs. bibtex: '@article{Bauch_Siebert_Jöns_Förstner_Schumacher_2023, title={On-demand indistinguishable and entangled photons at telecom frequencies using tailored cavity designs}, author={Bauch, David and Siebert, Dustin and Jöns, Klaus and Förstner, Jens and Schumacher, Stefan}, year={2023} }' chicago: Bauch, David, Dustin Siebert, Klaus Jöns, Jens Förstner, and Stefan Schumacher. “On-Demand Indistinguishable and Entangled Photons at Telecom Frequencies Using Tailored Cavity Designs,” 2023. ieee: D. Bauch, D. Siebert, K. Jöns, J. Förstner, and S. Schumacher, “On-demand indistinguishable and entangled photons at telecom frequencies using tailored cavity designs.” 2023. mla: Bauch, David, et al. On-Demand Indistinguishable and Entangled Photons at Telecom Frequencies Using Tailored Cavity Designs. 2023. short: D. Bauch, D. Siebert, K. Jöns, J. Förstner, S. Schumacher, (2023). date_created: 2023-03-31T13:22:05Z date_updated: 2023-12-21T10:41:17Z department: - _id: '61' - _id: '230' - _id: '429' - _id: '623' - _id: '15' - _id: '35' - _id: '170' - _id: '297' keyword: - tet_topic_phc - tet_topic_qd language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/pdf/2303.13871.pdf oa: '1' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' - _id: '173' grant_number: '231447078' name: 'TRR 142 - C09: TRR 142 - Subproject C09' - _id: '167' grant_number: '231447078' name: 'TRR 142 - B06: TRR 142 - Subproject B06' - _id: '53' grant_number: '231447078' name: 'TRR 142: TRR 142' - _id: '55' name: 'TRR 142 - B: TRR 142 - Project Area B' - _id: '56' name: 'TRR 142 - C: TRR 142 - Project Area C' related_material: record: - id: '48599' relation: later_version status: public status: public title: On-demand indistinguishable and entangled photons at telecom frequencies using tailored cavity designs type: preprint user_id: '16199' year: '2023' ... --- _id: '49890' abstract: - lang: eng text: In this paper, the influence of the environment on an inductive location system is analyzed. In the inductive location method, high frequency magnetic fields generated by planar coils lead to induction in other coils, which is used for localization analysis. Magnetic fields are not affected by changes in the dielectric properties of the environment, which is an advantage over other localization methods. However, electrical material parameters can still affect the localization results by indirect effects. For this reason, in this publication the influence will be investigated using real material parameters and their effects on the localization will be considered, so that the robustness and the limits of the inductive localization can be evaluated. author: - first_name: Sven full_name: Lange, Sven id: '38240' last_name: Lange - first_name: Ulrich full_name: Hilleringmann, Ulrich id: '20179' last_name: Hilleringmann - first_name: Christian full_name: Hedayat, Christian last_name: Hedayat - first_name: Harald full_name: Kuhn, Harald last_name: Kuhn - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Lange S, Hilleringmann U, Hedayat C, Kuhn H, Förstner J. Characterization of Various Environmental Influences on the Inductive Localization. In: 2023 IEEE Conference on Antenna Measurements and Applications (CAMA). IEEE; 2023. doi:10.1109/cama57522.2023.10352780' apa: Lange, S., Hilleringmann, U., Hedayat, C., Kuhn, H., & Förstner, J. (2023). Characterization of Various Environmental Influences on the Inductive Localization. 2023 IEEE Conference on Antenna Measurements and Applications (CAMA). 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), Genoa, Italy . https://doi.org/10.1109/cama57522.2023.10352780 bibtex: '@inproceedings{Lange_Hilleringmann_Hedayat_Kuhn_Förstner_2023, place={Genoa, Italy }, title={Characterization of Various Environmental Influences on the Inductive Localization}, DOI={10.1109/cama57522.2023.10352780}, booktitle={2023 IEEE Conference on Antenna Measurements and Applications (CAMA)}, publisher={IEEE}, author={Lange, Sven and Hilleringmann, Ulrich and Hedayat, Christian and Kuhn, Harald and Förstner, Jens}, year={2023} }' chicago: 'Lange, Sven, Ulrich Hilleringmann, Christian Hedayat, Harald Kuhn, and Jens Förstner. “Characterization of Various Environmental Influences on the Inductive Localization.” In 2023 IEEE Conference on Antenna Measurements and Applications (CAMA). Genoa, Italy : IEEE, 2023. https://doi.org/10.1109/cama57522.2023.10352780.' ieee: 'S. Lange, U. Hilleringmann, C. Hedayat, H. Kuhn, and J. Förstner, “Characterization of Various Environmental Influences on the Inductive Localization,” presented at the 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), Genoa, Italy , 2023, doi: 10.1109/cama57522.2023.10352780.' mla: Lange, Sven, et al. “Characterization of Various Environmental Influences on the Inductive Localization.” 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), IEEE, 2023, doi:10.1109/cama57522.2023.10352780. short: 'S. Lange, U. Hilleringmann, C. Hedayat, H. Kuhn, J. Förstner, in: 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), IEEE, Genoa, Italy , 2023.' conference: end_date: 2023-11-17 location: 'Genoa, Italy ' name: 2023 IEEE Conference on Antenna Measurements and Applications (CAMA) start_date: 2023-11-15 date_created: 2023-12-20T08:36:58Z date_updated: 2023-12-21T09:51:11Z department: - _id: '59' - _id: '61' - _id: '485' doi: 10.1109/cama57522.2023.10352780 keyword: - Planar coils - inductive locating - magnetic fields - environmental influences - eddy currents - tet_topic_hf language: - iso: eng main_file_link: - url: https://ieeexplore.ieee.org/document/10352780 place: 'Genoa, Italy ' publication: 2023 IEEE Conference on Antenna Measurements and Applications (CAMA) publication_identifier: eisbn: - 979-8-3503-2304-7 publication_status: published publisher: IEEE status: public title: Characterization of Various Environmental Influences on the Inductive Localization type: conference user_id: '158' year: '2023' ... --- _id: '50012' abstract: - lang: eng text: Silicon photonics, in conjunction with complementary metal-oxide-semiconductor (CMOS) fabrication, has greatly enhanced the development of integrated optical phased arrays. This facilitates a dynamic control of light in a compact form factor that enables the synthesis of arbitrary complex wavefronts in the infrared spectrum. We numerically demonstrate a large-scale two-dimensional silicon-based optical phased array (OPA) composed of nanoantennas with circular gratings that are balanced in power and aligned in phase, required for producing elegant radiation patterns in the far-field. For a wavelength of 1.55 μm, we optimize two antennas for the OPA exhibiting an upward radiation efficiency as high as 90%, with almost 6.8% of optical power concentrated in the field of view. Additionally, we believe that the proposed OPAs can be easily fabricated and would have the ability to generate complex holographic images, rendering them an attractive candidate for a wide range of applications like LiDAR sensors, optical trapping, optogenetic stimulation, and augmented-reality displays. author: - first_name: Henna full_name: Farheen, Henna last_name: Farheen - first_name: Andreas full_name: Strauch, Andreas last_name: Strauch - first_name: J. Christoph full_name: Scheytt, J. Christoph id: '37144' last_name: Scheytt orcid: '0000-0002-5950-6618 ' - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Farheen H, Strauch A, Scheytt JC, Myroshnychenko V, Förstner J. Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays. Photonics and Nanostructures - Fundamentals and Applications. 2023;58:101207. doi:10.1016/j.photonics.2023.101207 apa: Farheen, H., Strauch, A., Scheytt, J. C., Myroshnychenko, V., & Förstner, J. (2023). Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays. Photonics and Nanostructures - Fundamentals and Applications, 58, 101207. https://doi.org/10.1016/j.photonics.2023.101207 bibtex: '@article{Farheen_Strauch_Scheytt_Myroshnychenko_Förstner_2023, title={Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays}, volume={58}, DOI={10.1016/j.photonics.2023.101207}, journal={Photonics and Nanostructures - Fundamentals and Applications}, publisher={Elsevier BV}, author={Farheen, Henna and Strauch, Andreas and Scheytt, J. Christoph and Myroshnychenko, Viktor and Förstner, Jens}, year={2023}, pages={101207} }' chicago: 'Farheen, Henna, Andreas Strauch, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays.” Photonics and Nanostructures - Fundamentals and Applications 58 (2023): 101207. https://doi.org/10.1016/j.photonics.2023.101207.' ieee: 'H. Farheen, A. Strauch, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays,” Photonics and Nanostructures - Fundamentals and Applications, vol. 58, p. 101207, 2023, doi: 10.1016/j.photonics.2023.101207.' mla: Farheen, Henna, et al. “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays.” Photonics and Nanostructures - Fundamentals and Applications, vol. 58, Elsevier BV, 2023, p. 101207, doi:10.1016/j.photonics.2023.101207. short: H. Farheen, A. Strauch, J.C. Scheytt, V. Myroshnychenko, J. Förstner, Photonics and Nanostructures - Fundamentals and Applications 58 (2023) 101207. date_created: 2023-12-21T09:30:03Z date_updated: 2023-12-21T09:48:39Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' - _id: '58' doi: 10.1016/j.photonics.2023.101207 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2023-12-21T09:34:17Z date_updated: 2023-12-21T09:34:17Z file_id: '50013' file_name: 2ß23-12 Farheen - PNFA - Optimized, highly efficient silicon antennas for optical phased arrays.pdf file_size: 3339442 relation: main_file file_date_updated: 2023-12-21T09:34:17Z has_accepted_license: '1' intvolume: ' 58' keyword: - tet_topic_opticalantenna language: - iso: eng oa: '1' page: '101207' project: - _id: '266' grant_number: PROFILNRW-2020-067 name: 'PhoQC: PhoQC: Photonisches Quantencomputing' - _id: '167' grant_number: '231447078' name: 'TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)' - _id: '55' name: 'TRR 142 - B: TRR 142 - Project Area B' - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Photonics and Nanostructures - Fundamentals and Applications publication_identifier: issn: - 1569-4410 publication_status: published publisher: Elsevier BV related_material: link: - relation: research_data url: https://doi.org/10.5281/zenodo.10044122 status: public title: Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays type: journal_article user_id: '158' volume: 58 year: '2023' ... --- _id: '45596' abstract: - lang: eng text: Dielectric metasurfaces provide a unique platform for efficient harmonic generation and optical wavefront manipulation at the nanoscale. Tailoring phase and amplitude of a nonlinearly generated wave with a high emission efficiency using resonance-based metasurfaces is a challenging task that often requires state-of-the-art numerical methods. Here, we propose a simple yet effective approach combining a sampling method with a Monte Carlo approach to design the third-harmonic wavefront generated by all-dielectric metasurfaces composed of elliptical silicon nanodisks. Using this approach, we theoretically demonstrate the full nonlinear 2π phase control with a uniform and highest possible amplitude in the considered parameter space, allowing us to design metasurfaces operating as third harmonic beam deflectors capable of steering light into a desired direction with high emission efficiency. The TH beam deflection with a record calculated average conversion efficiency of 1.2 × 10–1 W–2 is achieved. We anticipate that the proposed approach will be widely applied as alternative to commonly used optimization algorithms with higher complexity and implementation effort for the design of metasurfaces with other holographic functionalities. author: - first_name: David full_name: Hähnel, David last_name: Hähnel - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko citation: ama: Hähnel D, Förstner J, Myroshnychenko V. Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces. ACS Photonics. Published online 2023. doi:10.1021/acsphotonics.2c01967 apa: Hähnel, D., Förstner, J., & Myroshnychenko, V. (2023). Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces. ACS Photonics. https://doi.org/10.1021/acsphotonics.2c01967 bibtex: '@article{Hähnel_Förstner_Myroshnychenko_2023, title={Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces}, DOI={10.1021/acsphotonics.2c01967}, journal={ACS Photonics}, publisher={American Chemical Society (ACS)}, author={Hähnel, David and Förstner, Jens and Myroshnychenko, Viktor}, year={2023} }' chicago: Hähnel, David, Jens Förstner, and Viktor Myroshnychenko. “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.” ACS Photonics, 2023. https://doi.org/10.1021/acsphotonics.2c01967. ieee: 'D. Hähnel, J. Förstner, and V. Myroshnychenko, “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces,” ACS Photonics, 2023, doi: 10.1021/acsphotonics.2c01967.' mla: Hähnel, David, et al. “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.” ACS Photonics, American Chemical Society (ACS), 2023, doi:10.1021/acsphotonics.2c01967. short: D. Hähnel, J. Förstner, V. Myroshnychenko, ACS Photonics (2023). date_created: 2023-06-13T09:43:25Z date_updated: 2023-06-13T09:49:12Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1021/acsphotonics.2c01967 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2023-06-13T09:48:17Z date_updated: 2023-06-13T09:48:17Z file_id: '45597' file_name: 2023-06 Hähnel - ACS Photonics - Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.pdf file_size: 5382111 relation: main_file file_date_updated: 2023-06-13T09:48:17Z has_accepted_license: '1' keyword: - tet_topic_meta language: - iso: eng main_file_link: - open_access: '1' oa: '1' project: - _id: '167' grant_number: '231447078' name: 'TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)' - _id: '55' name: 'TRR 142 - B: TRR 142 - Project Area B' - _id: '53' grant_number: '231447078' name: 'TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen' - _id: '75' grant_number: '231447078' name: 'TRR 142 - C05: TRR 142 - Nichtlineare optische Oberflächen basierend auf ZnO-plasmonischen Hybrid-Nanostrukturen (C05)' - _id: '56' name: 'TRR 142 - C: TRR 142 - Project Area C' - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: ACS Photonics publication_identifier: issn: - 2330-4022 - 2330-4022 publication_status: published publisher: American Chemical Society (ACS) status: public title: Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces type: journal_article user_id: '158' year: '2023' ... --- _id: '44097' abstract: - lang: eng text: We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These ‘Super-Fano’ resonances are investigated numerically in great detail using full-wave simulations. The theoretically predicted behavior of the metasurface is experimentally verified by linear and nonlinear transmission spectroscopy. Moreover, quantitative nonlinear measurements are performed, in which an absolute conversion efficiency as high as ηmax ≈ 2.8 × 10−7 a peak power intensity of 1.2 GW cm−2 is found. Compared to an unpatterned silicon film of the same thickness amplification factors of up to ~900 are demonstrated. Our results pave the way to exploiting a strong Fano-type multi-mode coupling in metasurfaces for high THG in potential applications. article_type: original author: - first_name: David full_name: Hähnel, David last_name: Hähnel - first_name: Christian full_name: Golla, Christian last_name: Golla - first_name: Maximilian full_name: Albert, Maximilian last_name: Albert - first_name: Thomas full_name: Zentgraf, Thomas id: '30525' last_name: Zentgraf orcid: 0000-0002-8662-1101 - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Cedrik full_name: Meier, Cedrik id: '20798' last_name: Meier orcid: https://orcid.org/0000-0002-3787-3572 citation: ama: 'Hähnel D, Golla C, Albert M, et al. A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. Light: Science & Applications. 2023;12(1):97. doi:https://doi.org/10.1038/s41377-023-01134-1' apa: 'Hähnel, D., Golla, C., Albert, M., Zentgraf, T., Myroshnychenko, V., Förstner, J., & Meier, C. (2023). A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. Light: Science & Applications, 12(1), 97. https://doi.org/10.1038/s41377-023-01134-1' bibtex: '@article{Hähnel_Golla_Albert_Zentgraf_Myroshnychenko_Förstner_Meier_2023, title={A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces}, volume={12}, DOI={https://doi.org/10.1038/s41377-023-01134-1}, number={1}, journal={Light: Science & Applications}, publisher={Springer Nature}, author={Hähnel, David and Golla, Christian and Albert, Maximilian and Zentgraf, Thomas and Myroshnychenko, Viktor and Förstner, Jens and Meier, Cedrik}, year={2023}, pages={97} }' chicago: 'Hähnel, David, Christian Golla, Maximilian Albert, Thomas Zentgraf, Viktor Myroshnychenko, Jens Förstner, and Cedrik Meier. “A Multi-Mode Super-Fano Mechanism for Enhanced Third Harmonic Generation in Silicon Metasurfaces.” Light: Science & Applications 12, no. 1 (2023): 97. https://doi.org/10.1038/s41377-023-01134-1.' ieee: 'D. Hähnel et al., “A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces,” Light: Science & Applications, vol. 12, no. 1, p. 97, 2023, doi: https://doi.org/10.1038/s41377-023-01134-1.' mla: 'Hähnel, David, et al. “A Multi-Mode Super-Fano Mechanism for Enhanced Third Harmonic Generation in Silicon Metasurfaces.” Light: Science & Applications, vol. 12, no. 1, Springer Nature, 2023, p. 97, doi:https://doi.org/10.1038/s41377-023-01134-1.' short: 'D. Hähnel, C. Golla, M. Albert, T. Zentgraf, V. Myroshnychenko, J. Förstner, C. Meier, Light: Science & Applications 12 (2023) 97.' date_created: 2023-04-21T09:45:07Z date_updated: 2023-04-21T10:04:05Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: https://doi.org/10.1038/s41377-023-01134-1 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2023-04-21T10:00:27Z date_updated: 2023-04-21T10:00:27Z file_id: '44098' file_name: 2023-04 Hähnel - LSA - Multimode Fano THG.pdf file_size: 2088874 relation: main_file - access_level: open_access content_type: application/pdf creator: fossie date_created: 2023-04-21T10:03:30Z date_updated: 2023-04-21T10:03:30Z file_id: '44099' file_name: 2023-04 Hähnel - LSA - Multimode Fano THG (supplementary information).pdf file_size: 986743 relation: supplementary_material file_date_updated: 2023-04-21T10:03:30Z has_accepted_license: '1' intvolume: ' 12' issue: '1' keyword: - tet_topic_meta language: - iso: eng oa: '1' page: '97' publication: 'Light: Science & Applications' publication_identifier: issn: - 2047-7538 publication_status: published publisher: Springer Nature quality_controlled: '1' status: public title: A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces type: journal_article user_id: '158' volume: 12 year: '2023' ... --- _id: '43245' abstract: - lang: eng text: High-contrast slab waveguide Bragg gratings with 1D periodicity are investigated. For specific oblique excitation by semi-guided waves at sufficiently high angles of incidence, the idealized structures do not exhibit any radiative losses, such that reflectance and transmittance for the single port mode add strictly up to one. We consider a series of symmetric, fully and partly etched finite gratings, for parameters found in integrated silicon photonics. These can act as spectral filters with a reasonably flattop response. Apodization can lead to more box shaped reflectance and transmittance spectra. Together with a narrowband Fabry–Perot filter, these configurations are characterized by reflection bands, or transmittance peaks, with widths that span three orders of magnitude. author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Henna full_name: Farheen, Henna last_name: Farheen - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Hammer M, Farheen H, Förstner J. How to suppress radiative losses in high-contrast integrated Bragg gratings. Journal of the Optical Society of America B. 2023;40(4):862. doi:10.1364/josab.485725 apa: Hammer, M., Farheen, H., & Förstner, J. (2023). How to suppress radiative losses in high-contrast integrated Bragg gratings. Journal of the Optical Society of America B, 40(4), 862. https://doi.org/10.1364/josab.485725 bibtex: '@article{Hammer_Farheen_Förstner_2023, title={How to suppress radiative losses in high-contrast integrated Bragg gratings}, volume={40}, DOI={10.1364/josab.485725}, number={4}, journal={Journal of the Optical Society of America B}, publisher={Optica Publishing Group}, author={Hammer, Manfred and Farheen, Henna and Förstner, Jens}, year={2023}, pages={862} }' chicago: 'Hammer, Manfred, Henna Farheen, and Jens Förstner. “How to Suppress Radiative Losses in High-Contrast Integrated Bragg Gratings.” Journal of the Optical Society of America B 40, no. 4 (2023): 862. https://doi.org/10.1364/josab.485725.' ieee: 'M. Hammer, H. Farheen, and J. Förstner, “How to suppress radiative losses in high-contrast integrated Bragg gratings,” Journal of the Optical Society of America B, vol. 40, no. 4, p. 862, 2023, doi: 10.1364/josab.485725.' mla: Hammer, Manfred, et al. “How to Suppress Radiative Losses in High-Contrast Integrated Bragg Gratings.” Journal of the Optical Society of America B, vol. 40, no. 4, Optica Publishing Group, 2023, p. 862, doi:10.1364/josab.485725. short: M. Hammer, H. Farheen, J. Förstner, Journal of the Optical Society of America B 40 (2023) 862. date_created: 2023-03-31T13:04:43Z date_updated: 2023-04-20T10:03:40Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1364/josab.485725 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2023-03-31T13:14:59Z date_updated: 2023-03-31T13:14:59Z file_id: '43247' file_name: ogr-afterreview.pdf file_size: 1982311 relation: main_file file_date_updated: 2023-03-31T13:14:59Z has_accepted_license: '1' intvolume: ' 40' issue: '4' keyword: - tet_topic_waveguide language: - iso: eng oa: '1' page: '862' project: - _id: '53' name: 'TRR 142: TRR 142' - _id: '55' name: 'TRR 142 - B: TRR 142 - Project Area B' - _id: '167' name: 'TRR 142 - B06: TRR 142 - Subproject B06' publication: Journal of the Optical Society of America B publication_identifier: issn: - 0740-3224 - 1520-8540 publication_status: published publisher: Optica Publishing Group status: public title: How to suppress radiative losses in high-contrast integrated Bragg gratings type: journal_article user_id: '158' volume: 40 year: '2023' ... --- _id: '43052' abstract: - lang: eng text: We demonstrate a large-scale two dimensional silicon-based optical phased array (OPA) composed of nanoantennas with circular gratings that are balanced in power and aligned in phase, required for producing desired radiation patterns in the far-field. The OPAs are numerically optimized to have an upward efficiency of up to 90%, targeting radiation concentration mainly in the field of view. We envision that our OPAs have the ability of generating complex holographic images, rendering them an attractive candidate for a wide range of applications like LiDAR sensors, optical trapping, optogenetic stimulation and augmented-reality displays. author: - first_name: Henna full_name: Farheen, Henna last_name: Farheen - first_name: Andreas full_name: Strauch, Andreas last_name: Strauch - first_name: J. Christoph full_name: Scheytt, J. Christoph id: '37144' last_name: Scheytt orcid: https://orcid.org/0000-0002-5950-6618 - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Farheen H, Strauch A, Scheytt JC, Myroshnychenko V, Förstner J. Optimized silicon antennas for optical phased arrays. In: García-Blanco SM, Cheben P, eds. Integrated Optics: Devices, Materials, and Technologies XXVII. SPIE; 2023:124241D. doi:10.1117/12.2658716' apa: 'Farheen, H., Strauch, A., Scheytt, J. C., Myroshnychenko, V., & Förstner, J. (2023). Optimized silicon antennas for optical phased arrays. In S. M. García-Blanco & P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVII (p. 124241D). SPIE. https://doi.org/10.1117/12.2658716' bibtex: '@inproceedings{Farheen_Strauch_Scheytt_Myroshnychenko_Förstner_2023, title={Optimized silicon antennas for optical phased arrays}, DOI={10.1117/12.2658716}, booktitle={Integrated Optics: Devices, Materials, and Technologies XXVII}, publisher={SPIE}, author={Farheen, Henna and Strauch, Andreas and Scheytt, J. Christoph and Myroshnychenko, Viktor and Förstner, Jens}, editor={García-Blanco, Sonia M. and Cheben, Pavel}, year={2023}, pages={124241D} }' chicago: 'Farheen, Henna, Andreas Strauch, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Optimized Silicon Antennas for Optical Phased Arrays.” In Integrated Optics: Devices, Materials, and Technologies XXVII, edited by Sonia M. García-Blanco and Pavel Cheben, 124241D. SPIE, 2023. https://doi.org/10.1117/12.2658716.' ieee: 'H. Farheen, A. Strauch, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Optimized silicon antennas for optical phased arrays,” in Integrated Optics: Devices, Materials, and Technologies XXVII, 2023, p. 124241D, doi: 10.1117/12.2658716.' mla: 'Farheen, Henna, et al. “Optimized Silicon Antennas for Optical Phased Arrays.” Integrated Optics: Devices, Materials, and Technologies XXVII, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2023, p. 124241D, doi:10.1117/12.2658716.' short: 'H. Farheen, A. Strauch, J.C. Scheytt, V. Myroshnychenko, J. Förstner, in: S.M. García-Blanco, P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVII, SPIE, 2023, p. 124241D.' date_created: 2023-03-21T12:35:18Z date_updated: 2023-03-22T20:53:50Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1117/12.2658716 editor: - first_name: Sonia M. full_name: García-Blanco, Sonia M. last_name: García-Blanco - first_name: Pavel full_name: Cheben, Pavel last_name: Cheben file: - access_level: request content_type: application/pdf creator: fossie date_created: 2023-03-22T07:41:49Z date_updated: 2023-03-22T20:53:11Z file_id: '43055' file_name: 2023-01 Poster Photonics West Henna OPA_A0.pdf file_size: 1747396 relation: main_file file_date_updated: 2023-03-22T20:53:11Z has_accepted_license: '1' keyword: - tet_topic_opticalantenna language: - iso: eng page: '124241D ' publication: 'Integrated Optics: Devices, Materials, and Technologies XXVII' publication_status: published publisher: SPIE status: public title: Optimized silicon antennas for optical phased arrays type: conference user_id: '14931' year: '2023' ... --- _id: '43051' abstract: - lang: eng text: We demonstrate the numerical and experimental realization of optimized optical traveling-wave antennas made of low-loss dielectric materials. These antennas exhibit highly directive radiation patterns and our studies reveal that this nature comes from two dominant guided TE modes excited in the waveguide-like director of the antenna, in addition to the leaky modes. The optimized antennas possess a broadband nature and have a nearunity radiation efficiency at an operational wavelength of 780 nm. Compared to the previously studied plasmonic antennas for photon emission, our all-dielectric approach demonstrates a new class of highly directional, low-loss, and broadband optical antennas. author: - first_name: Henna full_name: Farheen, Henna last_name: Farheen - first_name: Lok-Yee full_name: Yan, Lok-Yee last_name: Yan - first_name: Till full_name: Leuteritz, Till last_name: Leuteritz - first_name: Siqi full_name: Qiao, Siqi last_name: Qiao - first_name: Florian full_name: Spreyer, Florian last_name: Spreyer - first_name: Christian full_name: Schlickriede, Christian last_name: Schlickriede - first_name: Viktor full_name: Quiring, Viktor last_name: Quiring - first_name: Christof full_name: Eigner, Christof last_name: Eigner - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Thomas full_name: Zentgraf, Thomas id: '30525' last_name: Zentgraf orcid: 0000-0002-8662-1101 - first_name: Stefan full_name: Linden, Stefan last_name: Linden - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Farheen H, Yan L-Y, Leuteritz T, et al. Tailoring the directive nature of optical waveguide antennas. In: García-Blanco SM, Cheben P, eds. Integrated Optics: Devices, Materials, and Technologies XXVII. SPIE; 2023:124241E. doi:10.1117/12.2658921' apa: 'Farheen, H., Yan, L.-Y., Leuteritz, T., Qiao, S., Spreyer, F., Schlickriede, C., Quiring, V., Eigner, C., Silberhorn, C., Zentgraf, T., Linden, S., Myroshnychenko, V., & Förstner, J. (2023). Tailoring the directive nature of optical waveguide antennas. In S. M. García-Blanco & P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVII (p. 124241E). SPIE. https://doi.org/10.1117/12.2658921' bibtex: '@inproceedings{Farheen_Yan_Leuteritz_Qiao_Spreyer_Schlickriede_Quiring_Eigner_Silberhorn_Zentgraf_et al._2023, title={Tailoring the directive nature of optical waveguide antennas}, DOI={10.1117/12.2658921}, booktitle={Integrated Optics: Devices, Materials, and Technologies XXVII}, publisher={SPIE}, author={Farheen, Henna and Yan, Lok-Yee and Leuteritz, Till and Qiao, Siqi and Spreyer, Florian and Schlickriede, Christian and Quiring, Viktor and Eigner, Christof and Silberhorn, Christine and Zentgraf, Thomas and et al.}, editor={García-Blanco, Sonia M. and Cheben, Pavel}, year={2023}, pages={124241E} }' chicago: 'Farheen, Henna, Lok-Yee Yan, Till Leuteritz, Siqi Qiao, Florian Spreyer, Christian Schlickriede, Viktor Quiring, et al. “Tailoring the Directive Nature of Optical Waveguide Antennas.” In Integrated Optics: Devices, Materials, and Technologies XXVII, edited by Sonia M. García-Blanco and Pavel Cheben, 124241E. SPIE, 2023. https://doi.org/10.1117/12.2658921.' ieee: 'H. Farheen et al., “Tailoring the directive nature of optical waveguide antennas,” in Integrated Optics: Devices, Materials, and Technologies XXVII, 2023, p. 124241E, doi: 10.1117/12.2658921.' mla: 'Farheen, Henna, et al. “Tailoring the Directive Nature of Optical Waveguide Antennas.” Integrated Optics: Devices, Materials, and Technologies XXVII, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2023, p. 124241E, doi:10.1117/12.2658921.' short: 'H. Farheen, L.-Y. Yan, T. Leuteritz, S. Qiao, F. Spreyer, C. Schlickriede, V. Quiring, C. Eigner, C. Silberhorn, T. Zentgraf, S. Linden, V. Myroshnychenko, J. Förstner, in: S.M. García-Blanco, P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVII, SPIE, 2023, p. 124241E.' date_created: 2023-03-21T12:28:31Z date_updated: 2023-03-22T09:26:25Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1117/12.2658921 editor: - first_name: Sonia M. full_name: García-Blanco, Sonia M. last_name: García-Blanco - first_name: Pavel full_name: Cheben, Pavel last_name: Cheben file: - access_level: local content_type: application/pdf creator: fossie date_created: 2023-03-22T09:25:57Z date_updated: 2023-03-22T09:25:57Z file_id: '43062' file_name: 2023-01 Poster Photonics West Henna OWA_A0.pdf file_size: 1426599 relation: main_file file_date_updated: 2023-03-22T09:25:57Z has_accepted_license: '1' keyword: - tet_topic_opticalantenna language: - iso: eng page: 124241E publication: 'Integrated Optics: Devices, Materials, and Technologies XXVII' publication_status: published publisher: SPIE status: public title: Tailoring the directive nature of optical waveguide antennas type: conference user_id: '158' year: '2023' ... --- _id: '43018' article_number: '108557' author: - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko citation: ama: Alhaddad S, Förstner J, Grynko Y. Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength. Journal of Quantitative Spectroscopy and Radiative Transfer. 2023;302. doi:10.1016/j.jqsrt.2023.108557 apa: Alhaddad, S., Förstner, J., & Grynko, Y. (2023). Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength. Journal of Quantitative Spectroscopy and Radiative Transfer, 302, Article 108557. https://doi.org/10.1016/j.jqsrt.2023.108557 bibtex: '@article{Alhaddad_Förstner_Grynko_2023, title={Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength}, volume={302}, DOI={10.1016/j.jqsrt.2023.108557}, number={108557}, journal={Journal of Quantitative Spectroscopy and Radiative Transfer}, publisher={Elsevier BV}, author={Alhaddad, Samer and Förstner, Jens and Grynko, Yevgen}, year={2023} }' chicago: Alhaddad, Samer, Jens Förstner, and Yevgen Grynko. “Numerical Study of Light Backscattering from Layers of Absorbing Irregular Particles Larger than the Wavelength.” Journal of Quantitative Spectroscopy and Radiative Transfer 302 (2023). https://doi.org/10.1016/j.jqsrt.2023.108557. ieee: 'S. Alhaddad, J. Förstner, and Y. Grynko, “Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength,” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 302, Art. no. 108557, 2023, doi: 10.1016/j.jqsrt.2023.108557.' mla: Alhaddad, Samer, et al. “Numerical Study of Light Backscattering from Layers of Absorbing Irregular Particles Larger than the Wavelength.” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 302, 108557, Elsevier BV, 2023, doi:10.1016/j.jqsrt.2023.108557. short: S. Alhaddad, J. Förstner, Y. Grynko, Journal of Quantitative Spectroscopy and Radiative Transfer 302 (2023). date_created: 2023-03-14T12:32:54Z date_updated: 2023-03-15T17:36:13Z ddc: - '530' department: - _id: '61' doi: 10.1016/j.jqsrt.2023.108557 file: - access_level: local content_type: application/pdf creator: fossie date_created: 2023-03-15T15:58:15Z date_updated: 2023-03-15T15:58:15Z file_id: '43028' file_name: 2023-03 Alhaddad - JQSRT - Numerical study of light backscattering from layers of absorbing particles larger than the wavelength.pdf file_size: 1508833 relation: main_file - access_level: open_access content_type: application/pdf creator: fossie date_created: 2023-03-15T17:35:29Z date_updated: 2023-03-15T17:35:29Z file_id: '43029' file_name: 2023-03 Alhaddad - JQSRT - Numerical study of light backscattering from layers of absorbing particles larger than the wavelength (accepted manuscript).pdf file_size: 4254386 relation: main_file file_date_updated: 2023-03-15T17:35:29Z has_accepted_license: '1' intvolume: ' 302' keyword: - tet_topic_scattering language: - iso: eng oa: '1' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Journal of Quantitative Spectroscopy and Radiative Transfer publication_identifier: issn: - 0022-4073 publication_status: published publisher: Elsevier BV status: public title: Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength type: journal_article user_id: '158' volume: 302 year: '2023' ... --- _id: '33509' abstract: - lang: eng text: In this publication a novel method for far-field prediction from magnetic Huygens box data based on the boundary element method (BEM) is presented. Two examples are considered for the validation of this method. The first example represents an electric dipole so that the obtained calculations can be compared to an analytical solution. As a second example, a printed circuit board is considered and the calculated far-field is compared to a fullwave simulation. In both cases, the calculations for different field integral equations are under comparison, and the results indicate that the presented method performs very well with a combined field integral equation, for the specified problem, when only magnetic Huygens box data is given. author: - first_name: Christoph full_name: Marschalt, Christoph last_name: Marschalt - first_name: Dominik full_name: Schroder, Dominik last_name: Schroder - first_name: Sven full_name: Lange, Sven id: '38240' last_name: Lange - first_name: Ulrich full_name: Hilleringmann, Ulrich id: '20179' last_name: Hilleringmann - first_name: Christian full_name: Hedayat, Christian last_name: Hedayat - first_name: Harald full_name: Kuhn, Harald last_name: Kuhn - first_name: Denis full_name: Sievers, Denis last_name: Sievers - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Marschalt C, Schroder D, Lange S, et al. Far-field Calculation from magnetic Huygens Box Data using the Boundary Element Method. In: 2022 Smart Systems Integration (SSI). IEEE; 2022. doi:10.1109/ssi56489.2022.9901431' apa: Marschalt, C., Schroder, D., Lange, S., Hilleringmann, U., Hedayat, C., Kuhn, H., Sievers, D., & Förstner, J. (2022). Far-field Calculation from magnetic Huygens Box Data using the Boundary Element Method. 2022 Smart Systems Integration (SSI). 2022 Smart Systems Integration (SSI), Grenoble, France. https://doi.org/10.1109/ssi56489.2022.9901431 bibtex: '@inproceedings{Marschalt_Schroder_Lange_Hilleringmann_Hedayat_Kuhn_Sievers_Förstner_2022, place={Grenoble, France}, title={Far-field Calculation from magnetic Huygens Box Data using the Boundary Element Method}, DOI={10.1109/ssi56489.2022.9901431}, booktitle={2022 Smart Systems Integration (SSI)}, publisher={IEEE}, author={Marschalt, Christoph and Schroder, Dominik and Lange, Sven and Hilleringmann, Ulrich and Hedayat, Christian and Kuhn, Harald and Sievers, Denis and Förstner, Jens}, year={2022} }' chicago: 'Marschalt, Christoph, Dominik Schroder, Sven Lange, Ulrich Hilleringmann, Christian Hedayat, Harald Kuhn, Denis Sievers, and Jens Förstner. “Far-Field Calculation from Magnetic Huygens Box Data Using the Boundary Element Method.” In 2022 Smart Systems Integration (SSI). Grenoble, France: IEEE, 2022. https://doi.org/10.1109/ssi56489.2022.9901431.' ieee: 'C. Marschalt et al., “Far-field Calculation from magnetic Huygens Box Data using the Boundary Element Method,” presented at the 2022 Smart Systems Integration (SSI), Grenoble, France, 2022, doi: 10.1109/ssi56489.2022.9901431.' mla: Marschalt, Christoph, et al. “Far-Field Calculation from Magnetic Huygens Box Data Using the Boundary Element Method.” 2022 Smart Systems Integration (SSI), IEEE, 2022, doi:10.1109/ssi56489.2022.9901431. short: 'C. Marschalt, D. Schroder, S. Lange, U. Hilleringmann, C. Hedayat, H. Kuhn, D. Sievers, J. Förstner, in: 2022 Smart Systems Integration (SSI), IEEE, Grenoble, France, 2022.' conference: end_date: 2022-04-28 location: Grenoble, France name: 2022 Smart Systems Integration (SSI) start_date: 2022-04-27 date_created: 2022-10-04T11:31:43Z date_updated: 2023-10-31T07:40:54Z department: - _id: '59' - _id: '61' - _id: '485' doi: 10.1109/ssi56489.2022.9901431 keyword: - Near-Field Scanning - Huygens Box - Boundary Element Method - Method of Moments - tet_topic_hf language: - iso: eng main_file_link: - url: https://ieeexplore.ieee.org/document/9901431 place: Grenoble, France project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: 2022 Smart Systems Integration (SSI) publication_identifier: eisbn: - 978-1-6654-8849-5 publication_status: published publisher: IEEE status: public title: Far-field Calculation from magnetic Huygens Box Data using the Boundary Element Method type: conference user_id: '20179' year: '2022' ... --- _id: '30389' abstract: - lang: eng text: Online solvers for a series of standard 1-D or 2-D problems in integrated optics will be discussed. Implemented on the basis of HTML/JavaScript/SVG with core routines compiled from well tested C++-sources, the quasi-analytical algorithms require a computational load that can be handled easily even by current mobile devices. So far the series covers the 1-D guided modes of dielectric multilayer slab waveguides and the oblique plane wave reflection from these, the modes of rectangular channel waveguides (in an approximation of effective indices), bend modes of curved multilayer slabs, whispering-gallery resonances (“Quasi-Normal-Modes”) supported by circular dielectric cavities, the hybrid modes of circular multi-step-index optical fibers, bound and leaky modes of 1-D complex multilayers, including plasmonic surface modes, and, with restrictions, quite general rectangular scattering problems in 2-D. author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 citation: ama: 'Hammer M. Small-scale online simulations in guided-wave photonics. In: García-Blanco SM, Cheben P, eds. Integrated Optics: Devices, Materials, and Technologies XXVI. SPIE; 2022:1200414. doi:10.1117/12.2612208' apa: 'Hammer, M. (2022). Small-scale online simulations in guided-wave photonics. In S. M. García-Blanco & P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVI (p. 1200414). SPIE. https://doi.org/10.1117/12.2612208' bibtex: '@inproceedings{Hammer_2022, title={Small-scale online simulations in guided-wave photonics}, DOI={10.1117/12.2612208}, booktitle={Integrated Optics: Devices, Materials, and Technologies XXVI}, publisher={SPIE}, author={Hammer, Manfred}, editor={García-Blanco, Sonia M. and Cheben, Pavel}, year={2022}, pages={1200414} }' chicago: 'Hammer, Manfred. “Small-Scale Online Simulations in Guided-Wave Photonics.” In Integrated Optics: Devices, Materials, and Technologies XXVI, edited by Sonia M. García-Blanco and Pavel Cheben, 1200414. SPIE, 2022. https://doi.org/10.1117/12.2612208.' ieee: 'M. Hammer, “Small-scale online simulations in guided-wave photonics,” in Integrated Optics: Devices, Materials, and Technologies XXVI, 2022, p. 1200414, doi: 10.1117/12.2612208.' mla: 'Hammer, Manfred. “Small-Scale Online Simulations in Guided-Wave Photonics.” Integrated Optics: Devices, Materials, and Technologies XXVI, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2022, p. 1200414, doi:10.1117/12.2612208.' short: 'M. Hammer, in: S.M. García-Blanco, P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVI, SPIE, 2022, p. 1200414.' date_created: 2022-03-21T10:17:30Z date_updated: 2023-04-20T10:10:55Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1117/12.2612208 editor: - first_name: Sonia M. full_name: García-Blanco, Sonia M. last_name: García-Blanco - first_name: Pavel full_name: Cheben, Pavel last_name: Cheben file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2022-03-22T18:05:02Z date_updated: 2022-03-22T18:05:02Z file_id: '30445' file_name: 2022-03 Hammer - SPIE Photonics West 2022 - Small-scale online simulations in guided-wave photonics (official version).pdf file_size: 868473 relation: main_file file_date_updated: 2022-03-22T18:05:02Z has_accepted_license: '1' keyword: - tet_topic_waveguide language: - iso: eng oa: '1' page: '1200414' project: - _id: '53' name: 'TRR 142: TRR 142' - _id: '56' name: 'TRR 142 - C: TRR 142 - Project Area C' - _id: '75' name: 'TRR 142 - C05: TRR 142 - Subproject C05' publication: 'Integrated Optics: Devices, Materials, and Technologies XXVI' publication_status: published publisher: SPIE status: public title: Small-scale online simulations in guided-wave photonics type: conference user_id: '158' year: '2022' ... --- _id: '30210' abstract: - lang: eng text: Lithium niobate on insulator (LNOI) has a great potential for photonic integrated circuits, providing substantial versatility in design of various integrated components. To properly use these components in the implementation of different quantum protocols, photons with different properties are required. In this paper, we theoretically demonstrate a flexible source of correlated photons built on the LNOI waveguide of a special geometry. This source is based on the parametric down-conversion (PDC) process, in which the signal and idler photons are generated at the telecom wavelength and have different spatial profiles and polarizations, but the same group velocities. Distinguishability in polarizations and spatial profiles facilitates the routing and manipulating individual photons, while the equality of their group velocities leads to the absence of temporal walk-off between photons. We show how the spectral properties of the generated photons and the number of their frequency modes can be controlled depending on the pump characteristics and the waveguide length. Finally, we discuss special regimes, in which narrowband light with strong frequency correlations and polarization-entangled Bell states are generated at the telecom wavelength. author: - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Alessandro full_name: Ferreri, Alessandro id: '65609' last_name: Ferreri - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Maximilian full_name: Albert, Maximilian last_name: Albert - first_name: Cedrik full_name: Meier, Cedrik id: '20798' last_name: Meier orcid: https://orcid.org/0000-0002-3787-3572 - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Polina R. full_name: Sharapova, Polina R. id: '60286' last_name: Sharapova citation: ama: 'Ebers L, Ferreri A, Hammer M, et al. Flexible source of correlated photons based on LNOI rib waveguides. Journal of Physics: Photonics. 2022;4:025001. doi:10.1088/2515-7647/ac5a5b' apa: 'Ebers, L., Ferreri, A., Hammer, M., Albert, M., Meier, C., Förstner, J., & Sharapova, P. R. (2022). Flexible source of correlated photons based on LNOI rib waveguides. Journal of Physics: Photonics, 4, 025001. https://doi.org/10.1088/2515-7647/ac5a5b' bibtex: '@article{Ebers_Ferreri_Hammer_Albert_Meier_Förstner_Sharapova_2022, title={Flexible source of correlated photons based on LNOI rib waveguides}, volume={4}, DOI={10.1088/2515-7647/ac5a5b}, journal={Journal of Physics: Photonics}, publisher={IOP Publishing}, author={Ebers, Lena and Ferreri, Alessandro and Hammer, Manfred and Albert, Maximilian and Meier, Cedrik and Förstner, Jens and Sharapova, Polina R.}, year={2022}, pages={025001} }' chicago: 'Ebers, Lena, Alessandro Ferreri, Manfred Hammer, Maximilian Albert, Cedrik Meier, Jens Förstner, and Polina R. Sharapova. “Flexible Source of Correlated Photons Based on LNOI Rib Waveguides.” Journal of Physics: Photonics 4 (2022): 025001. https://doi.org/10.1088/2515-7647/ac5a5b.' ieee: 'L. Ebers et al., “Flexible source of correlated photons based on LNOI rib waveguides,” Journal of Physics: Photonics, vol. 4, p. 025001, 2022, doi: 10.1088/2515-7647/ac5a5b.' mla: 'Ebers, Lena, et al. “Flexible Source of Correlated Photons Based on LNOI Rib Waveguides.” Journal of Physics: Photonics, vol. 4, IOP Publishing, 2022, p. 025001, doi:10.1088/2515-7647/ac5a5b.' short: 'L. Ebers, A. Ferreri, M. Hammer, M. Albert, C. Meier, J. Förstner, P.R. Sharapova, Journal of Physics: Photonics 4 (2022) 025001.' date_created: 2022-03-07T09:51:50Z date_updated: 2023-03-24T07:39:18Z department: - _id: '61' - _id: '230' - _id: '429' - _id: '15' - _id: '569' - _id: '170' - _id: '287' doi: 10.1088/2515-7647/ac5a5b intvolume: ' 4' keyword: - tet_topic_waveguide language: - iso: eng page: '025001' project: - _id: '56' name: 'TRR 142 - C: TRR 142 - Project Area C' - _id: '75' name: 'TRR 142 - C5: TRR 142 - Subproject C5' - _id: '72' name: 'TRR 142 - C2: TRR 142 - Subproject C2' - _id: '53' name: 'TRR 142: TRR 142' publication: 'Journal of Physics: Photonics' publication_identifier: issn: - 2515-7647 publication_status: published publisher: IOP Publishing related_material: link: - description: Corrigendum for table C1 relation: erratum url: https://doi.org/10.1088/2515-7647/acc70c status: public title: Flexible source of correlated photons based on LNOI rib waveguides type: journal_article user_id: '158' volume: 4 year: '2022' ... --- _id: '33466' abstract: - lang: eng text: 'We review our results of numerical simulations of light scattering from different systems of densely packed irregular particles. We consider spherical clusters, thick layers and monolayers with realistic topologies and dimensions much larger than the wavelength of light. The maximum bulk packing density of clusters is 0.5. A numerically exact solution of the electromagnetic problem is obtained using the Discontinuous Galerkin Time Domain method and with application of high- performance computing. We show that high packing density causes light localization in such structures which makes an impact on the opposition phenomena: backscattering intensity surge and negative linear polarization feature. Diffuse multiple scattering is significantly reduced in the case of non-absorbing particles and near-field interaction results in a percolation-like light transport determined by the topology of the medium. With this the negative polarization feature caused by single scattering gets enhanced if compared to lower density samples. We also confirm coherent double scattering mechanism of negative polarization for light scattered from dense absorbing slabs. In this case convergent result for the scattering angle polarization dependency at backscattering can be obtained for a layer of just a few tens of particles if they are larger than the wavelength.' author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Grynko Y, Shkuratov Y, Alhaddad S, Förstner J. Light Scattering by Large Densely Packed Clusters of Particles. In: Kokhanovsky A, ed. Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media. Vol 8. Springer Series in Light Scattering. Springer International Publishing; 2022. doi:10.1007/978-3-031-10298-1_4' apa: 'Grynko, Y., Shkuratov, Y., Alhaddad, S., & Förstner, J. (2022). Light Scattering by Large Densely Packed Clusters of Particles. In A. Kokhanovsky (Ed.), Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media (Vol. 8). Springer International Publishing. https://doi.org/10.1007/978-3-031-10298-1_4' bibtex: '@inbook{Grynko_Shkuratov_Alhaddad_Förstner_2022, place={Cham}, series={Springer Series in Light Scattering}, title={Light Scattering by Large Densely Packed Clusters of Particles}, volume={8}, DOI={10.1007/978-3-031-10298-1_4}, booktitle={Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media}, publisher={Springer International Publishing}, author={Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}, editor={Kokhanovsky, Alexander}, year={2022}, collection={Springer Series in Light Scattering} }' chicago: 'Grynko, Yevgen, Yuriy Shkuratov, Samer Alhaddad, and Jens Förstner. “Light Scattering by Large Densely Packed Clusters of Particles.” In Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media, edited by Alexander Kokhanovsky, Vol. 8. Springer Series in Light Scattering. Cham: Springer International Publishing, 2022. https://doi.org/10.1007/978-3-031-10298-1_4.' ieee: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, and J. Förstner, “Light Scattering by Large Densely Packed Clusters of Particles,” in Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media, vol. 8, A. Kokhanovsky, Ed. Cham: Springer International Publishing, 2022.' mla: 'Grynko, Yevgen, et al. “Light Scattering by Large Densely Packed Clusters of Particles.” Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media, edited by Alexander Kokhanovsky, vol. 8, Springer International Publishing, 2022, doi:10.1007/978-3-031-10298-1_4.' short: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, J. Förstner, in: A. Kokhanovsky (Ed.), Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media, Springer International Publishing, Cham, 2022.' date_created: 2022-09-22T09:18:45Z date_updated: 2023-01-11T15:28:17Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1007/978-3-031-10298-1_4 editor: - first_name: Alexander full_name: Kokhanovsky, Alexander last_name: Kokhanovsky file: - access_level: local content_type: application/pdf creator: fossie date_created: 2022-09-22T09:24:45Z date_updated: 2022-09-22T09:24:45Z file_id: '33467' file_name: 2022-09 Grynko - Book chapter on Light Scattering by Large Densely Packed Clusters of Particles.pdf file_size: 1525307 relation: main_file file_date_updated: 2022-09-22T09:24:45Z has_accepted_license: '1' intvolume: ' 8' keyword: - tet_topic_scattering language: - iso: eng main_file_link: - open_access: '1' url: https://rdcu.be/cV5GC oa: '1' place: Cham project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: 'Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media' publication_identifier: isbn: - '9783031102974' - '9783031102981' issn: - 2509-2790 - 2509-2804 publication_status: published publisher: Springer International Publishing series_title: Springer Series in Light Scattering status: public title: Light Scattering by Large Densely Packed Clusters of Particles type: book_chapter user_id: '158' volume: 8 year: '2022' ... --- _id: '35128' abstract: - lang: eng text: Here we demonstrate a new, to the best of our knowledge, type of 3-dB coupler that has an ultra-broadband operational range from 1300 to 1600 nm with low fabrication sensitivity. The overall device size is 800 µm including in/out S-bend waveguides. The coupler is an asymmetric non-uniform directional coupler that consists of two tapered waveguides. One of the coupler arms is shifted by 100 µm in the propagation direction, which results in a more wavelength-insensitive 3-dB response compared to a standard (not shifted) coupler. Moreover, compared to a long adiabatic coupler, we achieved a similar wavelength response at a 16-times-smaller device length. The couplers were fabricated using the silicon nitride platform of Lionix International. We also experimentally demonstrated an optical switch that is made by using two of these couplers in a Mach–Zehnder interferometer configuration. According to experimental results, this optical switch exhibits –10 dB of extinction ratio over the 1500–1600 nm wavelength range. Our results indicate that this new type of coupler holds great promise for various applications, including optical imaging, telecommunications, and reconfigurable photonic processors where compact, fabrication-tolerant, and wavelength-insensitive couplers are essential. author: - first_name: Hamed full_name: Nikbakht, Hamed last_name: Nikbakht - first_name: Mohammad Talebi full_name: Khoshmehr, Mohammad Talebi last_name: Khoshmehr - first_name: Bob full_name: van Someren, Bob last_name: van Someren - first_name: Dieter full_name: Teichrib, Dieter last_name: Teichrib - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: B. Imran full_name: Akca, B. Imran last_name: Akca citation: ama: Nikbakht H, Khoshmehr MT, van Someren B, et al. Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint. Optics Letters. 2022;48(2):207. doi:10.1364/ol.476537 apa: Nikbakht, H., Khoshmehr, M. T., van Someren, B., Teichrib, D., Hammer, M., Förstner, J., & Akca, B. I. (2022). Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint. Optics Letters, 48(2), 207. https://doi.org/10.1364/ol.476537 bibtex: '@article{Nikbakht_Khoshmehr_van Someren_Teichrib_Hammer_Förstner_Akca_2022, title={Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint}, volume={48}, DOI={10.1364/ol.476537}, number={2}, journal={Optics Letters}, publisher={Optica Publishing Group}, author={Nikbakht, Hamed and Khoshmehr, Mohammad Talebi and van Someren, Bob and Teichrib, Dieter and Hammer, Manfred and Förstner, Jens and Akca, B. Imran}, year={2022}, pages={207} }' chicago: 'Nikbakht, Hamed, Mohammad Talebi Khoshmehr, Bob van Someren, Dieter Teichrib, Manfred Hammer, Jens Förstner, and B. Imran Akca. “Asymmetric, Non-Uniform 3-DB Directional Coupler with 300-Nm Bandwidth and a Small Footprint.” Optics Letters 48, no. 2 (2022): 207. https://doi.org/10.1364/ol.476537.' ieee: 'H. Nikbakht et al., “Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint,” Optics Letters, vol. 48, no. 2, p. 207, 2022, doi: 10.1364/ol.476537.' mla: Nikbakht, Hamed, et al. “Asymmetric, Non-Uniform 3-DB Directional Coupler with 300-Nm Bandwidth and a Small Footprint.” Optics Letters, vol. 48, no. 2, Optica Publishing Group, 2022, p. 207, doi:10.1364/ol.476537. short: H. Nikbakht, M.T. Khoshmehr, B. van Someren, D. Teichrib, M. Hammer, J. Förstner, B.I. Akca, Optics Letters 48 (2022) 207. date_created: 2023-01-03T09:32:47Z date_updated: 2023-01-03T10:37:34Z ddc: - '530' department: - _id: '61' - _id: '230' doi: 10.1364/ol.476537 file: - access_level: local content_type: application/pdf creator: fossie date_created: 2023-01-03T09:36:34Z date_updated: 2023-01-03T09:36:34Z embargo: 2024-01-03 embargo_to: open_access file_id: '35129' file_name: 2023-01 Nikbakht - Optics Letter - Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and small footprint.pdf file_size: 3731864 relation: main_file file_date_updated: 2023-01-03T09:36:34Z has_accepted_license: '1' intvolume: ' 48' issue: '2' keyword: - tet_topic_waveguide language: - iso: eng page: '207' publication: Optics Letters publication_identifier: issn: - 0146-9592 - 1539-4794 publication_status: published publisher: Optica Publishing Group status: public title: Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint type: journal_article user_id: '158' volume: 48 year: '2022' ... --- _id: '34136' author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Grynko Y, Shkuratov Y, Alhaddad S, Förstner J. Light backscattering from numerical analog of planetary regoliths. In: Copernicus GmbH; 2022. doi:  10.5194/epsc2022-151' apa: Grynko, Y., Shkuratov, Y., Alhaddad, S., & Förstner, J. (2022). Light backscattering from numerical analog of planetary regoliths. 16th Europlanet Science Congress 2022, Granada, Spain. https://doi.org/  10.5194/epsc2022-151 bibtex: '@inproceedings{Grynko_Shkuratov_Alhaddad_Förstner_2022, title={Light backscattering from numerical analog of planetary regoliths}, DOI={  10.5194/epsc2022-151}, publisher={Copernicus GmbH}, author={Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}, year={2022} }' chicago: Grynko, Yevgen, Yuriy Shkuratov, Samer Alhaddad, and Jens Förstner. “Light Backscattering from Numerical Analog of Planetary Regoliths.” Copernicus GmbH, 2022. https://doi.org/  10.5194/epsc2022-151. ieee: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, and J. Förstner, “Light backscattering from numerical analog of planetary regoliths,” presented at the 16th Europlanet Science Congress 2022, Granada, Spain, 2022, doi:   10.5194/epsc2022-151.' mla: Grynko, Yevgen, et al. Light Backscattering from Numerical Analog of Planetary Regoliths. Copernicus GmbH, 2022, doi:  10.5194/epsc2022-151. short: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, J. Förstner, in: Copernicus GmbH, 2022.' conference: end_date: 2022-09-23 location: Granada, Spain name: 16th Europlanet Science Congress 2022 start_date: 2022-09-18 date_created: 2022-11-23T12:03:29Z date_updated: 2022-11-23T12:09:03Z ddc: - '530' department: - _id: '61' - _id: '230' doi: ' 10.5194/epsc2022-151' file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2022-11-23T12:07:10Z date_updated: 2022-11-23T12:07:10Z file_id: '34137' file_name: 2022-09 Grynko - EPSC2022 conference -151-print.pdf file_size: 645190 relation: main_file file_date_updated: 2022-11-23T12:07:10Z has_accepted_license: '1' keyword: - tet_topic_scattering language: - iso: eng oa: '1' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication_status: published publisher: Copernicus GmbH status: public title: Light backscattering from numerical analog of planetary regoliths type: conference_abstract user_id: '158' year: '2022' ... --- _id: '31574' abstract: - lang: eng text: We model negative polarization, which is observed for planetary regoliths at backscattering, solving a full wave problem of light scattering with a numerically exact Discontinuous Galerkin Time Domain (DGTD) method. Pieces of layers with the bulk packing density of particles close to 0.5 are used. The model particles are highly absorbing and have irregular shapes and sizes larger than the wavelength of light. This represents a realistic analog of low-albedo planetary regoliths. Our simulations confirm coherent backscattering mechanism of the origin of negative polarization. We show that angular profiles of polarization are stabilized if the number of particles in a layer piece becomes larger than ten. This allows application of our approach to the negative polarization modeling for planetary regoliths. author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Grynko Y, Shkuratov Y, Alhaddad S, Förstner J. Negative polarization of light at backscattering from a numerical analog of planetary regoliths. Icarus. 2022;384:115099. doi:10.1016/j.icarus.2022.115099 apa: Grynko, Y., Shkuratov, Y., Alhaddad, S., & Förstner, J. (2022). Negative polarization of light at backscattering from a numerical analog of planetary regoliths. Icarus, 384, 115099. https://doi.org/10.1016/j.icarus.2022.115099 bibtex: '@article{Grynko_Shkuratov_Alhaddad_Förstner_2022, title={Negative polarization of light at backscattering from a numerical analog of planetary regoliths}, volume={384}, DOI={10.1016/j.icarus.2022.115099}, journal={Icarus}, publisher={Elsevier BV}, author={Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}, year={2022}, pages={115099} }' chicago: 'Grynko, Yevgen, Yuriy Shkuratov, Samer Alhaddad, and Jens Förstner. “Negative Polarization of Light at Backscattering from a Numerical Analog of Planetary Regoliths.” Icarus 384 (2022): 115099. https://doi.org/10.1016/j.icarus.2022.115099.' ieee: 'Y. Grynko, Y. Shkuratov, S. Alhaddad, and J. Förstner, “Negative polarization of light at backscattering from a numerical analog of planetary regoliths,” Icarus, vol. 384, p. 115099, 2022, doi: 10.1016/j.icarus.2022.115099.' mla: Grynko, Yevgen, et al. “Negative Polarization of Light at Backscattering from a Numerical Analog of Planetary Regoliths.” Icarus, vol. 384, Elsevier BV, 2022, p. 115099, doi:10.1016/j.icarus.2022.115099. short: Y. Grynko, Y. Shkuratov, S. Alhaddad, J. Förstner, Icarus 384 (2022) 115099. date_created: 2022-06-01T18:53:35Z date_updated: 2022-06-01T18:57:51Z ddc: - '530' department: - _id: '61' doi: 10.1016/j.icarus.2022.115099 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2022-06-01T18:56:44Z date_updated: 2022-06-01T18:56:44Z file_id: '31575' file_name: 2022-06 Grynko - Icarus - Negative polarization of light at backscattering from a numerical analog of planetary regoliths.pdf file_size: 1419286 relation: main_file file_date_updated: 2022-06-01T18:56:44Z has_accepted_license: '1' intvolume: ' 384' keyword: - tet_topic_scattering language: - iso: eng oa: '1' page: '115099' project: - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Icarus publication_identifier: issn: - 0019-1035 publication_status: published publisher: Elsevier BV status: public title: Negative polarization of light at backscattering from a numerical analog of planetary regoliths type: journal_article user_id: '158' volume: 384 year: '2022' ... --- _id: '31329' abstract: - lang: eng text: Highly directive antennas with the ability of shaping radiation patterns in desired directions are essential for efficient on-chip optical communication with reduced cross talk. In this paper, we design and optimize three distinct broadband traveling-wave tantalum pentoxide antennas exhibiting highly directional characteristics. Our antennas contain a director and reflector deposited on a glass substrate, which are excited by a dipole emitter placed in the feed gap between the two elements. Full-wave simulations in conjunction with global optimization provide structures with an enhanced linear directivity as high as 119 radiating in the substrate. The high directivity is a result of the interplay between two dominant TE modes and the leaky modes present in the antenna director. Furthermore, these low-loss dielectric antennas exhibit a near-unity radiation efficiency at the operational wavelength of 780 nm and maintain a broad bandwidth. Our numerical results are in good agreement with experimental measurements from the optimized antennas fabricated using a two-step electron-beam lithography, revealing the highly directive nature of our structures. We envision that our antenna designs can be conveniently adapted to other dielectric materials and prove instrumental for inter-chip optical communications and other on-chip applications. author: - first_name: Henna full_name: Farheen, Henna last_name: Farheen - first_name: Lok-Yee full_name: Yan, Lok-Yee last_name: Yan - first_name: Viktor full_name: Quiring, Viktor last_name: Quiring - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Thomas full_name: Zentgraf, Thomas id: '30525' last_name: Zentgraf orcid: 0000-0002-8662-1101 - first_name: Stefan full_name: Linden, Stefan last_name: Linden - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko citation: ama: Farheen H, Yan L-Y, Quiring V, et al. Broadband optical Ta2O5 antennas for directional emission of light. Optics Express. 2022;30(11):19288. doi:10.1364/oe.455815 apa: Farheen, H., Yan, L.-Y., Quiring, V., Eigner, C., Zentgraf, T., Linden, S., Förstner, J., & Myroshnychenko, V. (2022). Broadband optical Ta2O5 antennas for directional emission of light. Optics Express, 30(11), 19288. https://doi.org/10.1364/oe.455815 bibtex: '@article{Farheen_Yan_Quiring_Eigner_Zentgraf_Linden_Förstner_Myroshnychenko_2022, title={Broadband optical Ta2O5 antennas for directional emission of light}, volume={30}, DOI={10.1364/oe.455815}, number={11}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Farheen, Henna and Yan, Lok-Yee and Quiring, Viktor and Eigner, Christof and Zentgraf, Thomas and Linden, Stefan and Förstner, Jens and Myroshnychenko, Viktor}, year={2022}, pages={19288} }' chicago: 'Farheen, Henna, Lok-Yee Yan, Viktor Quiring, Christof Eigner, Thomas Zentgraf, Stefan Linden, Jens Förstner, and Viktor Myroshnychenko. “Broadband Optical Ta2O5 Antennas for Directional Emission of Light.” Optics Express 30, no. 11 (2022): 19288. https://doi.org/10.1364/oe.455815.' ieee: 'H. Farheen et al., “Broadband optical Ta2O5 antennas for directional emission of light,” Optics Express, vol. 30, no. 11, p. 19288, 2022, doi: 10.1364/oe.455815.' mla: Farheen, Henna, et al. “Broadband Optical Ta2O5 Antennas for Directional Emission of Light.” Optics Express, vol. 30, no. 11, Optica Publishing Group, 2022, p. 19288, doi:10.1364/oe.455815. short: H. Farheen, L.-Y. Yan, V. Quiring, C. Eigner, T. Zentgraf, S. Linden, J. Förstner, V. Myroshnychenko, Optics Express 30 (2022) 19288. date_created: 2022-05-18T16:39:17Z date_updated: 2022-05-18T20:01:46Z department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1364/oe.455815 intvolume: ' 30' issue: '11' keyword: - tet_topic_opticalantenna language: - iso: eng page: '19288' project: - _id: '75' name: 'TRR 142 - C5: TRR 142 - Subproject C5' - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Optics Express publication_identifier: issn: - 1094-4087 publication_status: published publisher: Optica Publishing Group status: public title: Broadband optical Ta2O5 antennas for directional emission of light type: journal_article user_id: '158' volume: 30 year: '2022' ... --- _id: '30722' abstract: - lang: eng text: In dieser Arbeit wird die elektromagnetische Wellenausbreitung in integrierten optischen Wellenleitern mit Hilfe von halb analytischen und numerischen Simulationsmethoden untersucht. Im ersten Teil werden 2-D Si/SiO2-Wellenleiterkonfigurationen mit hohem Brechungsindexkontrast betrachtet. Die Strukturen werden mit halb geführten Wellen unter schrägen Ausbreitungswinkeln angeregt. Dadurch kann die Leistungsübertragung zu bestimmten ausgehenden Moden unterdrückt werden, wodurch vollständig verlustfreie Systeme entstehen. Zusätzlich dient die Anregung mit einem seitlich begrenzten, einfallenden Wellenbündel aus halb geführten Wellen dazu, praktisch relevantere 3-D Konfigurationen zu realisieren. Darüber hinaus wird eine schrittweise Winkelspektrum-Methode vorgestellt, die es ermöglicht, in Kombination mit voll vektoriellen 2-D Finite-Elemente-Lösungen für Teilprobleme mit geringerer Komplexität, die Wellenausbreitung in planaren, linsenförmigen Wellenleitern numerisch in drei Raumrichtungen zu berechnen. Im zweiten Teil dieser Arbeit wird die Ausbreitung in Wellenleiterstrukturen aus Lithiumniobat untersucht, welche für quantenoptische Effekte genutzt werden. Zur Detektion einzelner Photonen werden supraleitende Nanodrähte auf eindiffundierten Lithiumniobat Wellenleitern mit zusätzlicher Taperschicht aus Silizium betrachtet. Um die Wellenausbreitung in diesen 3-D Wellenleitern zu beschreiben, wird eine einseitig gerichtete Finite-Elemente „Modal Matching“ Methode eingeführt. Abschließend werden Rippenwellenleiter aus Lithiumniobat analysiert, die auf Siliziumdioxid Plattformen aufgebracht sind. Der Schwerpunkt liegt hier auf dem nichtlinearen „Parametric Down-Conversion“ Prozess, der für die Erzeugung verschränkter Photonen verwendet wird. - lang: eng text: In this work, the electromagnetic wave propagation in integrated optical waveguides is studied by using semi-analytical and numerical simulation methods. In the first part, 2-D high-index contrast Si/SiO2 dielectric slab waveguide configurations are investigated. The structures are excited with semi-guided waves at oblique angles of propagation. Due to this, power transfer to specific outgoing modes can be suppressed, resulting in completely lossless configurations. The excitation is further examined for incoming, laterally confined wave bundles of semi-guided waves to realize practically more relevant 3-D configurations. Additionally, a stepwise angular spectrum method in combination with full vectorial 2-D finite element solutions for subproblems of lower complexity to numerically simulate the wave propagation in full 3-D planar lens-like waveguides is presented. In the second part, the wave propagation in lithium niobate waveguide structures is examined, which are used for quantum optical effects. On the one hand, superconducting nanowires on titanium in-diffused lithium niobate waveguides with an additional tapered silicon layer are used for single photon detection. The wave propagation in these 3-D multiscale tapers is studied by introducing a unidirectional finite element modal matching method. On the other hand, lithium niobate rib waveguides on silicon dioxide platforms are analyzed, focusing on the nonlinear parametric down-conversion process used for the generation of entangled photons. author: - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers citation: ama: Ebers L. Semi-Guided Waves in Integrated Optical Waveguide Structures.; 2022. doi:10.17619/UNIPB/1-1288 apa: Ebers, L. (2022). Semi-guided waves in integrated optical waveguide structures. https://doi.org/10.17619/UNIPB/1-1288 bibtex: '@book{Ebers_2022, title={Semi-guided waves in integrated optical waveguide structures}, DOI={10.17619/UNIPB/1-1288}, author={Ebers, Lena}, year={2022} }' chicago: Ebers, Lena. Semi-Guided Waves in Integrated Optical Waveguide Structures, 2022. https://doi.org/10.17619/UNIPB/1-1288. ieee: L. Ebers, Semi-guided waves in integrated optical waveguide structures. 2022. mla: Ebers, Lena. Semi-Guided Waves in Integrated Optical Waveguide Structures. 2022, doi:10.17619/UNIPB/1-1288. short: L. Ebers, Semi-Guided Waves in Integrated Optical Waveguide Structures, 2022. date_created: 2022-03-29T18:42:08Z date_updated: 2022-03-29T18:44:30Z department: - _id: '61' - _id: '230' doi: 10.17619/UNIPB/1-1288 keyword: - tet_topic_waveguide language: - iso: eng status: public supervisor: - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 title: Semi-guided waves in integrated optical waveguide structures type: dissertation user_id: '158' year: '2022' ... --- _id: '30387' abstract: - lang: eng text: Resonant evanescent coupling can be utilized to selectively excite orbital angular momentum (OAM) modes of high angular order supported by a thin circular dielectric rod. Our 2.5-D hybrid-analytical coupled mode model combines the vectorial fields associated with the fundamental TE- and TM-modes of a standard silicon photonics slab waveguide, propagating at oblique angles with respect to the rod axis, and the hybrid modes supported by the rod. One observes an efficient resonant interaction in cases where the common axial wavenumber of the waves in the slab matches the propagation constant of one or more modes of the rod. For certain modes of high angular order, the incident wave is able to transfer its directionality to the field in the fiber, exciting effectively only one of a pair of degenerate OAM modes author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Hammer M, Ebers L, Förstner J. Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber. In: Andrews DL, Galvez EJ, Rubinsztein-Dunlop H, eds. Complex Light and Optical Forces XVI. SPIE; 2022:120170F. doi:10.1117/12.2612179' apa: Hammer, M., Ebers, L., & Förstner, J. (2022). Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber. In D. L. Andrews, E. J. Galvez, & H. Rubinsztein-Dunlop (Eds.), Complex Light and Optical Forces XVI (p. 120170F). SPIE. https://doi.org/10.1117/12.2612179 bibtex: '@inproceedings{Hammer_Ebers_Förstner_2022, title={Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber}, DOI={10.1117/12.2612179}, booktitle={Complex Light and Optical Forces XVI}, publisher={SPIE}, author={Hammer, Manfred and Ebers, Lena and Förstner, Jens}, editor={Andrews, David L. and Galvez, Enrique J. and Rubinsztein-Dunlop, Halina}, year={2022}, pages={120170F} }' chicago: Hammer, Manfred, Lena Ebers, and Jens Förstner. “Resonant Evanescent Excitation of OAM Modes in a High-Contrast Circular Step-Index Fiber.” In Complex Light and Optical Forces XVI, edited by David L. Andrews, Enrique J. Galvez, and Halina Rubinsztein-Dunlop, 120170F. SPIE, 2022. https://doi.org/10.1117/12.2612179. ieee: 'M. Hammer, L. Ebers, and J. Förstner, “Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber,” in Complex Light and Optical Forces XVI, 2022, p. 120170F, doi: 10.1117/12.2612179.' mla: Hammer, Manfred, et al. “Resonant Evanescent Excitation of OAM Modes in a High-Contrast Circular Step-Index Fiber.” Complex Light and Optical Forces XVI, edited by David L. Andrews et al., SPIE, 2022, p. 120170F, doi:10.1117/12.2612179. short: 'M. Hammer, L. Ebers, J. Förstner, in: D.L. Andrews, E.J. Galvez, H. Rubinsztein-Dunlop (Eds.), Complex Light and Optical Forces XVI, SPIE, 2022, p. 120170F.' date_created: 2022-03-21T10:12:58Z date_updated: 2022-03-22T18:04:20Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1117/12.2612179 editor: - first_name: David L. full_name: Andrews, David L. last_name: Andrews - first_name: Enrique J. full_name: Galvez, Enrique J. last_name: Galvez - first_name: Halina full_name: Rubinsztein-Dunlop, Halina last_name: Rubinsztein-Dunlop file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2022-03-22T18:03:50Z date_updated: 2022-03-22T18:03:50Z file_id: '30444' file_name: 2022-03 Hammer - SPIE Photonics West 2022 - Resonant evanescent excitation of OAM modes in a high-contrast circular (official version).pdf file_size: 2015899 relation: main_file file_date_updated: 2022-03-22T18:03:50Z has_accepted_license: '1' keyword: - tet_topic_waveguide language: - iso: eng oa: '1' page: 120170F project: - _id: '56' name: 'TRR 142 - C: TRR 142 - Project Area C' - _id: '53' name: 'TRR 142: TRR 142' - _id: '75' name: 'TRR 142 - C5: TRR 142 - Subproject C5' publication: Complex Light and Optical Forces XVI publication_status: published publisher: SPIE status: public title: Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber type: conference user_id: '158' year: '2022' ... --- _id: '29075' abstract: - lang: eng text: We study a double-scattering coherent mechanism of negative polarization (NP) near opposition that is observed for powder-like surfaces. The problem is solved numerically for absorbing structures with irregular constituents, cubes, spheres, and ellipsoids larger than the wavelength of incident light. Our simulations show that double scattering between two random irregular particles shows weak NP. Adding one more particle significantly increases the relative contribution of double scattering which enhances NP. Simulations with regular shapes and controlled geometric parameters show that the interference mechanism is sensitive to the geometry of the scattering system and can also result in no polarization or even strong enhancement of positive polarization at backscattering. author: - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Henna full_name: Farheen, Henna last_name: Farheen - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Alhaddad S, Grynko Y, Farheen H, Förstner J. Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles. Optics Letters. 2022;47(1):58. doi:10.1364/ol.444953 apa: Alhaddad, S., Grynko, Y., Farheen, H., & Förstner, J. (2022). Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles. Optics Letters, 47(1), 58. https://doi.org/10.1364/ol.444953 bibtex: '@article{Alhaddad_Grynko_Farheen_Förstner_2022, title={Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles}, volume={47}, DOI={10.1364/ol.444953}, number={1}, journal={Optics Letters}, author={Alhaddad, Samer and Grynko, Yevgen and Farheen, Henna and Förstner, Jens}, year={2022}, pages={58} }' chicago: 'Alhaddad, Samer, Yevgen Grynko, Henna Farheen, and Jens Förstner. “Numerical Analysis of the Coherent Mechanism Producing Negative Polarization at Backscattering from Systems of Absorbing Particles.” Optics Letters 47, no. 1 (2022): 58. https://doi.org/10.1364/ol.444953.' ieee: 'S. Alhaddad, Y. Grynko, H. Farheen, and J. Förstner, “Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles,” Optics Letters, vol. 47, no. 1, p. 58, 2022, doi: 10.1364/ol.444953.' mla: Alhaddad, Samer, et al. “Numerical Analysis of the Coherent Mechanism Producing Negative Polarization at Backscattering from Systems of Absorbing Particles.” Optics Letters, vol. 47, no. 1, 2022, p. 58, doi:10.1364/ol.444953. short: S. Alhaddad, Y. Grynko, H. Farheen, J. Förstner, Optics Letters 47 (2022) 58. date_created: 2021-12-21T13:49:29Z date_updated: 2022-01-06T06:58:46Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1364/ol.444953 file: - access_level: local content_type: application/pdf creator: fossie date_created: 2021-12-21T13:53:47Z date_updated: 2021-12-21T13:53:47Z embargo: 2022-12-21 embargo_to: open_access file_id: '29076' file_name: 2022-01 Alhaddad - Optics Letter - Double Scattering.pdf file_size: 3197213 relation: main_file file_date_updated: 2021-12-21T13:53:47Z has_accepted_license: '1' intvolume: ' 47' issue: '1' keyword: - tet_topic_scattering language: - iso: eng page: '58' project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Optics Letters publication_identifier: issn: - 0146-9592 - 1539-4794 publication_status: published status: public title: Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles type: journal_article user_id: '158' volume: 47 year: '2022' ... --- _id: '28413' abstract: - lang: eng text: Optical traveling wave antennas offer unique opportunities to control and selectively guide light into a specific direction, which renders them excellent candidates for optical communication and sensing. These applications require state-of-the-art engineering to reach optimized functionalities such as high directivity and radiation efficiency, low sidelobe levels, broadband and tunable capabilities, and compact design. In this work, we report on the numerical optimization of the directivity of optical traveling wave antennas made from low-loss dielectric materials using full-wave numerical simulations in conjunction with the particle swarm optimization algorithm. The antennas are composed of a reflector and a director deposited on a glass substrate, and an emitter placed in the feed gap between them serves as an internal source of excitation. In particular, we analyze antennas with rectangular- and horn-shaped directors made of either hafnium dioxide or silicon. The optimized antennas produce highly directional emissions due to the presence of two dominant guided TE modes in the director in addition to leaky modes. These guided modes dominate the far-field emission pattern and govern the direction of the main lobe emission, which predominately originates from the end facet of the director. Our work also provides a comprehensive analysis of the modes, radiation patterns, parametric influences, and bandwidths of the antennas, which highlights their robust nature. author: - first_name: Henna full_name: Farheen, Henna last_name: Farheen - first_name: Till full_name: Leuteritz, Till last_name: Leuteritz - first_name: Stefan full_name: Linden, Stefan last_name: Linden - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Farheen H, Leuteritz T, Linden S, Myroshnychenko V, Förstner J. Optimization of optical waveguide antennas for directive emission of light. Journal of the Optical Society of America B. 2022;39(1):83. doi:10.1364/josab.438514 apa: Farheen, H., Leuteritz, T., Linden, S., Myroshnychenko, V., & Förstner, J. (2022). Optimization of optical waveguide antennas for directive emission of light. Journal of the Optical Society of America B, 39(1), 83. https://doi.org/10.1364/josab.438514 bibtex: '@article{Farheen_Leuteritz_Linden_Myroshnychenko_Förstner_2022, title={Optimization of optical waveguide antennas for directive emission of light}, volume={39}, DOI={10.1364/josab.438514}, number={1}, journal={Journal of the Optical Society of America B}, author={Farheen, Henna and Leuteritz, Till and Linden, Stefan and Myroshnychenko, Viktor and Förstner, Jens}, year={2022}, pages={83} }' chicago: 'Farheen, Henna, Till Leuteritz, Stefan Linden, Viktor Myroshnychenko, and Jens Förstner. “Optimization of Optical Waveguide Antennas for Directive Emission of Light.” Journal of the Optical Society of America B 39, no. 1 (2022): 83. https://doi.org/10.1364/josab.438514.' ieee: 'H. Farheen, T. Leuteritz, S. Linden, V. Myroshnychenko, and J. Förstner, “Optimization of optical waveguide antennas for directive emission of light,” Journal of the Optical Society of America B, vol. 39, no. 1, p. 83, 2022, doi: 10.1364/josab.438514.' mla: Farheen, Henna, et al. “Optimization of Optical Waveguide Antennas for Directive Emission of Light.” Journal of the Optical Society of America B, vol. 39, no. 1, 2022, p. 83, doi:10.1364/josab.438514. short: H. Farheen, T. Leuteritz, S. Linden, V. Myroshnychenko, J. Förstner, Journal of the Optical Society of America B 39 (2022) 83. date_created: 2021-12-08T07:14:39Z date_updated: 2022-01-06T06:58:04Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1364/josab.438514 file: - access_level: local content_type: application/pdf creator: fossie date_created: 2021-12-08T08:26:57Z date_updated: 2021-12-08T08:26:57Z embargo: 2022-12-08 embargo_to: open_access file_id: '28417' file_name: 2021-12 Farheen - JOSA B - Optimization of optical nanoantennas.pdf file_size: 14029741 relation: main_file - access_level: open_access content_type: application/pdf creator: fossie date_created: 2021-12-08T08:29:49Z date_updated: 2021-12-08T08:29:49Z file_id: '28418' file_name: 2021-12 Farheen - JOSA B - Optimization of optical nanoantennas SUPPLEMENTARY MATERIAL.pdf file_size: 655495 relation: supplementary_material file_date_updated: 2021-12-08T08:29:49Z has_accepted_license: '1' intvolume: ' 39' issue: '1' keyword: - tet_topic_opticalantenna language: - iso: eng oa: '1' page: '83' project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C - _id: '75' name: TRR 142 - Subproject C5 - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Journal of the Optical Society of America B publication_identifier: issn: - 0740-3224 - 1520-8540 publication_status: published status: public title: Optimization of optical waveguide antennas for directive emission of light type: journal_article user_id: '158' volume: 39 year: '2022' ... --- _id: '24788' author: - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Stefan full_name: Groth, Stefan last_name: Groth - first_name: Daniel full_name: Grünewald, Daniel last_name: Grünewald - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Frank full_name: Hannig, Frank last_name: Hannig - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter - first_name: Franz‐Josef full_name: Pfreundt, Franz‐Josef last_name: Pfreundt - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 - first_name: Merlind full_name: Schotte, Merlind last_name: Schotte - first_name: Thomas full_name: Steinke, Thomas last_name: Steinke - first_name: Jürgen full_name: Teich, Jürgen last_name: Teich - first_name: Martin full_name: Weiser, Martin last_name: Weiser - first_name: Florian full_name: Wende, Florian last_name: Wende citation: ama: 'Alhaddad S, Förstner J, Groth S, et al. The HighPerMeshes framework for numerical algorithms on unstructured grids. Concurrency and Computation: Practice and Experience. Published online 2021:e6616. doi:10.1002/cpe.6616' apa: 'Alhaddad, S., Förstner, J., Groth, S., Grünewald, D., Grynko, Y., Hannig, F., Kenter, T., Pfreundt, F., Plessl, C., Schotte, M., Steinke, T., Teich, J., Weiser, M., & Wende, F. (2021). The HighPerMeshes framework for numerical algorithms on unstructured grids. Concurrency and Computation: Practice and Experience, e6616. https://doi.org/10.1002/cpe.6616' bibtex: '@article{Alhaddad_Förstner_Groth_Grünewald_Grynko_Hannig_Kenter_Pfreundt_Plessl_Schotte_et al._2021, title={The HighPerMeshes framework for numerical algorithms on unstructured grids}, DOI={10.1002/cpe.6616}, journal={Concurrency and Computation: Practice and Experience}, author={Alhaddad, Samer and Förstner, Jens and Groth, Stefan and Grünewald, Daniel and Grynko, Yevgen and Hannig, Frank and Kenter, Tobias and Pfreundt, Franz‐Josef and Plessl, Christian and Schotte, Merlind and et al.}, year={2021}, pages={e6616} }' chicago: 'Alhaddad, Samer, Jens Förstner, Stefan Groth, Daniel Grünewald, Yevgen Grynko, Frank Hannig, Tobias Kenter, et al. “The HighPerMeshes Framework for Numerical Algorithms on Unstructured Grids.” Concurrency and Computation: Practice and Experience, 2021, e6616. https://doi.org/10.1002/cpe.6616.' ieee: 'S. Alhaddad et al., “The HighPerMeshes framework for numerical algorithms on unstructured grids,” Concurrency and Computation: Practice and Experience, p. e6616, 2021, doi: 10.1002/cpe.6616.' mla: 'Alhaddad, Samer, et al. “The HighPerMeshes Framework for Numerical Algorithms on Unstructured Grids.” Concurrency and Computation: Practice and Experience, 2021, p. e6616, doi:10.1002/cpe.6616.' short: 'S. Alhaddad, J. Förstner, S. Groth, D. Grünewald, Y. Grynko, F. Hannig, T. Kenter, F. Pfreundt, C. Plessl, M. Schotte, T. Steinke, J. Teich, M. Weiser, F. Wende, Concurrency and Computation: Practice and Experience (2021) e6616.' date_created: 2021-09-22T06:15:50Z date_updated: 2023-09-26T11:42:19Z ddc: - '004' department: - _id: '61' - _id: '230' - _id: '27' - _id: '518' doi: 10.1002/cpe.6616 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2021-09-22T06:19:29Z date_updated: 2021-09-22T06:19:29Z file_id: '24789' file_name: 2021-09 Alhaddad - Concurrency... - The HighPerMeshes framework for numerical algorithms on unstructured grids.pdf file_size: 2300152 relation: main_file file_date_updated: 2021-09-22T06:19:29Z has_accepted_license: '1' keyword: - tet_topic_hpc language: - iso: eng oa: '1' page: e6616 project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing - _id: '33' grant_number: 01|H16005A name: HighPerMeshes publication: 'Concurrency and Computation: Practice and Experience' publication_identifier: issn: - 1532-0626 - 1532-0634 publication_status: published quality_controlled: '1' status: public title: The HighPerMeshes framework for numerical algorithms on unstructured grids type: journal_article user_id: '15278' year: '2021' ... --- _id: '21587' abstract: - lang: eng text: Solving partial differential equations on unstructured grids is a cornerstone of engineering and scientific computing. Nowadays, heterogeneous parallel platforms with CPUs, GPUs, and FPGAs enable energy-efficient and computationally demanding simulations. We developed the HighPerMeshes C++-embedded Domain-Specific Language (DSL) for bridging the abstraction gap between the mathematical and algorithmic formulation of mesh-based algorithms for PDE problems on the one hand and an increasing number of heterogeneous platforms with their different parallel programming and runtime models on the other hand. Thus, the HighPerMeshes DSL aims at higher productivity in the code development process for multiple target platforms. We introduce the concepts as well as the basic structure of the HighPerMeshes DSL, and demonstrate its usage with three examples, a Poisson and monodomain problem, respectively, solved by the continuous finite element method, and the discontinuous Galerkin method for Maxwell’s equation. The mapping of the abstract algorithmic description onto parallel hardware, including distributed memory compute clusters, is presented. Finally, the achievable performance and scalability are demonstrated for a typical example problem on a multi-core CPU cluster. author: - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Stefan full_name: Groth, Stefan last_name: Groth - first_name: Daniel full_name: Grünewald, Daniel last_name: Grünewald - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Frank full_name: Hannig, Frank last_name: Hannig - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter - first_name: Franz-Josef full_name: Pfreundt, Franz-Josef last_name: Pfreundt - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 - first_name: Merlind full_name: Schotte, Merlind last_name: Schotte - first_name: Thomas full_name: Steinke, Thomas last_name: Steinke - first_name: Jürgen full_name: Teich, Jürgen last_name: Teich - first_name: Martin full_name: Weiser, Martin last_name: Weiser - first_name: Florian full_name: Wende, Florian last_name: Wende citation: ama: 'Alhaddad S, Förstner J, Groth S, et al. HighPerMeshes – A Domain-Specific Language for Numerical Algorithms on Unstructured Grids. In: Euro-Par 2020: Parallel Processing Workshops. ; 2021. doi:10.1007/978-3-030-71593-9_15' apa: 'Alhaddad, S., Förstner, J., Groth, S., Grünewald, D., Grynko, Y., Hannig, F., Kenter, T., Pfreundt, F.-J., Plessl, C., Schotte, M., Steinke, T., Teich, J., Weiser, M., & Wende, F. (2021). HighPerMeshes – A Domain-Specific Language for Numerical Algorithms on Unstructured Grids. In Euro-Par 2020: Parallel Processing Workshops. https://doi.org/10.1007/978-3-030-71593-9_15' bibtex: '@inbook{Alhaddad_Förstner_Groth_Grünewald_Grynko_Hannig_Kenter_Pfreundt_Plessl_Schotte_et al._2021, place={Cham}, title={HighPerMeshes – A Domain-Specific Language for Numerical Algorithms on Unstructured Grids}, DOI={10.1007/978-3-030-71593-9_15}, booktitle={Euro-Par 2020: Parallel Processing Workshops}, author={Alhaddad, Samer and Förstner, Jens and Groth, Stefan and Grünewald, Daniel and Grynko, Yevgen and Hannig, Frank and Kenter, Tobias and Pfreundt, Franz-Josef and Plessl, Christian and Schotte, Merlind and et al.}, year={2021} }' chicago: 'Alhaddad, Samer, Jens Förstner, Stefan Groth, Daniel Grünewald, Yevgen Grynko, Frank Hannig, Tobias Kenter, et al. “HighPerMeshes – A Domain-Specific Language for Numerical Algorithms on Unstructured Grids.” In Euro-Par 2020: Parallel Processing Workshops. Cham, 2021. https://doi.org/10.1007/978-3-030-71593-9_15.' ieee: 'S. Alhaddad et al., “HighPerMeshes – A Domain-Specific Language for Numerical Algorithms on Unstructured Grids,” in Euro-Par 2020: Parallel Processing Workshops, Cham, 2021.' mla: 'Alhaddad, Samer, et al. “HighPerMeshes – A Domain-Specific Language for Numerical Algorithms on Unstructured Grids.” Euro-Par 2020: Parallel Processing Workshops, 2021, doi:10.1007/978-3-030-71593-9_15.' short: 'S. Alhaddad, J. Förstner, S. Groth, D. Grünewald, Y. Grynko, F. Hannig, T. Kenter, F.-J. Pfreundt, C. Plessl, M. Schotte, T. Steinke, J. Teich, M. Weiser, F. Wende, in: Euro-Par 2020: Parallel Processing Workshops, Cham, 2021.' date_created: 2021-03-31T19:39:42Z date_updated: 2023-09-26T11:40:25Z ddc: - '004' department: - _id: '61' - _id: '230' - _id: '429' - _id: '27' - _id: '518' doi: 10.1007/978-3-030-71593-9_15 file: - access_level: closed content_type: application/pdf creator: fossie date_created: 2021-03-31T19:42:52Z date_updated: 2021-03-31T19:42:52Z file_id: '21588' file_name: 2021-03 Alhaddad2021_Chapter_HighPerMeshesADomain-SpecificL.pdf file_size: 564398 relation: main_file success: 1 file_date_updated: 2021-03-31T19:42:52Z has_accepted_license: '1' keyword: - tet_topic_hpc language: - iso: eng place: Cham project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: 'Euro-Par 2020: Parallel Processing Workshops' publication_identifier: isbn: - '9783030715922' - '9783030715939' issn: - 0302-9743 - 1611-3349 publication_status: published quality_controlled: '1' status: public title: HighPerMeshes – A Domain-Specific Language for Numerical Algorithms on Unstructured Grids type: book_chapter user_id: '15278' year: '2021' ... --- _id: '23816' abstract: - lang: eng text: Employing the ultrafast control of electronic states of a semiconductor quantum dot in a cavity, we introduce an approach to achieve on-demand emission of single photons with almost perfect indistinguishability and photon pairs with near ideal entanglement. Our scheme is based on optical excitation off resonant to a cavity mode followed by ultrafast control of the electronic states using the time-dependent quantum-confined Stark effect, which then allows for cavity-resonant emission. Our theoretical analysis considers cavity-loss mechanisms, the Stark effect, and phonon-induced dephasing, allowing realistic predictions for finite temperatures. author: - first_name: David full_name: Bauch, David last_name: Bauch - first_name: Dirk Florian full_name: Heinze, Dirk Florian id: '10904' last_name: Heinze - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Klaus full_name: Jöns, Klaus id: '85353' last_name: Jöns - first_name: Stefan full_name: Schumacher, Stefan id: '27271' last_name: Schumacher orcid: 0000-0003-4042-4951 citation: ama: Bauch D, Heinze DF, Förstner J, Jöns K, Schumacher S. Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots. Physical Review B. 2021;104:085308. doi:10.1103/physrevb.104.085308 apa: Bauch, D., Heinze, D. F., Förstner, J., Jöns, K., & Schumacher, S. (2021). Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots. Physical Review B, 104, 085308. https://doi.org/10.1103/physrevb.104.085308 bibtex: '@article{Bauch_Heinze_Förstner_Jöns_Schumacher_2021, title={Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots}, volume={104}, DOI={10.1103/physrevb.104.085308}, journal={Physical Review B}, author={Bauch, David and Heinze, Dirk Florian and Förstner, Jens and Jöns, Klaus and Schumacher, Stefan}, year={2021}, pages={085308} }' chicago: 'Bauch, David, Dirk Florian Heinze, Jens Förstner, Klaus Jöns, and Stefan Schumacher. “Ultrafast Electric Control of Cavity Mediated Single-Photon and Photon-Pair Generation with Semiconductor Quantum Dots.” Physical Review B 104 (2021): 085308. https://doi.org/10.1103/physrevb.104.085308.' ieee: 'D. Bauch, D. F. Heinze, J. Förstner, K. Jöns, and S. Schumacher, “Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots,” Physical Review B, vol. 104, p. 085308, 2021, doi: 10.1103/physrevb.104.085308.' mla: Bauch, David, et al. “Ultrafast Electric Control of Cavity Mediated Single-Photon and Photon-Pair Generation with Semiconductor Quantum Dots.” Physical Review B, vol. 104, 2021, p. 085308, doi:10.1103/physrevb.104.085308. short: D. Bauch, D.F. Heinze, J. Förstner, K. Jöns, S. Schumacher, Physical Review B 104 (2021) 085308. date_created: 2021-09-06T18:02:44Z date_updated: 2023-04-20T15:33:52Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '15' - _id: '170' - _id: '297' - _id: '429' - _id: '623' - _id: '35' doi: 10.1103/physrevb.104.085308 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2021-09-07T06:32:25Z date_updated: 2021-09-07T07:43:47Z file_id: '23818' file_name: 2021-08 Bauch PhysRevB.104.085308.pdf file_size: 887439 relation: main_file file_date_updated: 2021-09-07T07:43:47Z has_accepted_license: '1' intvolume: ' 104' keyword: - tet_topic_qd language: - iso: eng oa: '1' page: '085308' project: - _id: '53' name: TRR 142 - _id: '54' name: TRR 142 - Project Area A - _id: '60' name: TRR 142 - Subproject A3 - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' publication: Physical Review B publication_identifier: issn: - 2469-9950 - 2469-9969 publication_status: published status: public title: Ultrafast electric control of cavity mediated single-photon and photon-pair generation with semiconductor quantum dots type: journal_article user_id: '16199' volume: 104 year: '2021' ... --- _id: '27099' abstract: - lang: eng text: In our work, we have engineered low capacitance single quantum dot photodiodes as sensor devices for the optoelectronic sampling of ultrafast electric signals. By the Stark effect, a time-dependent electric signal is converted into a time-dependent shift of the transition energy. This shift is measured accurately by resonant ps laser spectroscopy with photocurrent detection. In our experiments, we sample the laser synchronous output pulse of an ultrafast CMOS circuit with high resolution. With our quantum dot sensor device, we were able to sample transients below 20 ps with a voltage resolution in the mV-range. author: - first_name: Alex full_name: Widhalm, Alex last_name: Widhalm - first_name: Sebastian full_name: Krehs, Sebastian last_name: Krehs - first_name: Dustin full_name: Siebert, Dustin last_name: Siebert - first_name: Nand Lal full_name: Sharma, Nand Lal last_name: Sharma - first_name: Timo full_name: Langer, Timo last_name: Langer - first_name: Björn full_name: Jonas, Björn last_name: Jonas - first_name: Dirk full_name: Reuter, Dirk id: '37763' last_name: Reuter - first_name: Andreas full_name: Thiede, Andreas id: '538' last_name: Thiede - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Artur full_name: Zrenner, Artur id: '606' last_name: Zrenner orcid: 0000-0002-5190-0944 citation: ama: Widhalm A, Krehs S, Siebert D, et al. Optoelectronic sampling of ultrafast electric transients with single quantum dots. Applied Physics Letters. 2021;119:181109. doi:10.1063/5.0061358 apa: Widhalm, A., Krehs, S., Siebert, D., Sharma, N. L., Langer, T., Jonas, B., Reuter, D., Thiede, A., Förstner, J., & Zrenner, A. (2021). Optoelectronic sampling of ultrafast electric transients with single quantum dots. Applied Physics Letters, 119, 181109. https://doi.org/10.1063/5.0061358 bibtex: '@article{Widhalm_Krehs_Siebert_Sharma_Langer_Jonas_Reuter_Thiede_Förstner_Zrenner_2021, title={Optoelectronic sampling of ultrafast electric transients with single quantum dots}, volume={119}, DOI={10.1063/5.0061358}, journal={Applied Physics Letters}, author={Widhalm, Alex and Krehs, Sebastian and Siebert, Dustin and Sharma, Nand Lal and Langer, Timo and Jonas, Björn and Reuter, Dirk and Thiede, Andreas and Förstner, Jens and Zrenner, Artur}, year={2021}, pages={181109} }' chicago: 'Widhalm, Alex, Sebastian Krehs, Dustin Siebert, Nand Lal Sharma, Timo Langer, Björn Jonas, Dirk Reuter, Andreas Thiede, Jens Förstner, and Artur Zrenner. “Optoelectronic Sampling of Ultrafast Electric Transients with Single Quantum Dots.” Applied Physics Letters 119 (2021): 181109. https://doi.org/10.1063/5.0061358.' ieee: 'A. Widhalm et al., “Optoelectronic sampling of ultrafast electric transients with single quantum dots,” Applied Physics Letters, vol. 119, p. 181109, 2021, doi: 10.1063/5.0061358.' mla: Widhalm, Alex, et al. “Optoelectronic Sampling of Ultrafast Electric Transients with Single Quantum Dots.” Applied Physics Letters, vol. 119, 2021, p. 181109, doi:10.1063/5.0061358. short: A. Widhalm, S. Krehs, D. Siebert, N.L. Sharma, T. Langer, B. Jonas, D. Reuter, A. Thiede, J. Förstner, A. Zrenner, Applied Physics Letters 119 (2021) 181109. date_created: 2021-11-03T10:32:03Z date_updated: 2023-01-24T11:11:54Z ddc: - '530' department: - _id: '15' - _id: '230' - _id: '61' - _id: '51' doi: 10.1063/5.0061358 file: - access_level: local content_type: application/pdf creator: fossie date_created: 2021-11-04T13:46:27Z date_updated: 2021-11-04T13:46:27Z embargo: 2022-11-04 embargo_to: open_access file_id: '27157' file_name: 2021-11 Widhalm - APL - Optoelectronic sampling of ultrafast electric transients with single quantum dots (published version).pdf file_size: 1999652 relation: main_file file_date_updated: 2021-11-04T13:46:27Z has_accepted_license: '1' intvolume: ' 119' keyword: - tet_topic_qd language: - iso: eng page: '181109' project: - _id: '74' name: TRR 142 - Subproject C4 - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing - _id: '60' name: TRR 142 - Subproject A3 publication: Applied Physics Letters publication_identifier: issn: - 0003-6951 - 1077-3118 publication_status: published status: public title: Optoelectronic sampling of ultrafast electric transients with single quantum dots type: journal_article user_id: '158' volume: 119 year: '2021' ... --- _id: '28196' abstract: - lang: eng text: We show that narrow trenches in a high-contrast silicon-photonics slab can act as lossless power dividers for semi-guided waves. Reflectance and transmittance can be easily configured by selecting the trench width. At sufficiently high angles of incidence, the devices are lossless, apart from material attenuation and scattering due to surface roughness. We numerically simulate a series of devices within the full 0-to-1-range of splitting ratios, for semi-guided plane wave incidence as well as for excitation by focused Gaussian wave bundles. Straightforward cascading of the trenches leads to concepts for 1×M-power dividers and a polarization beam splitter. author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Hammer M, Ebers L, Förstner J. Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics. OSA Continuum. 2021;4(12):3081. doi:10.1364/osac.437549 apa: Hammer, M., Ebers, L., & Förstner, J. (2021). Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics. OSA Continuum, 4(12), 3081. https://doi.org/10.1364/osac.437549 bibtex: '@article{Hammer_Ebers_Förstner_2021, title={Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics}, volume={4}, DOI={10.1364/osac.437549}, number={12}, journal={OSA Continuum}, author={Hammer, Manfred and Ebers, Lena and Förstner, Jens}, year={2021}, pages={3081} }' chicago: 'Hammer, Manfred, Lena Ebers, and Jens Förstner. “Configurable Lossless Broadband Beam Splitters for Semi-Guided Waves in Integrated Silicon Photonics.” OSA Continuum 4, no. 12 (2021): 3081. https://doi.org/10.1364/osac.437549.' ieee: 'M. Hammer, L. Ebers, and J. Förstner, “Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics,” OSA Continuum, vol. 4, no. 12, p. 3081, 2021, doi: 10.1364/osac.437549.' mla: Hammer, Manfred, et al. “Configurable Lossless Broadband Beam Splitters for Semi-Guided Waves in Integrated Silicon Photonics.” OSA Continuum, vol. 4, no. 12, 2021, p. 3081, doi:10.1364/osac.437549. short: M. Hammer, L. Ebers, J. Förstner, OSA Continuum 4 (2021) 3081. date_created: 2021-11-30T20:04:57Z date_updated: 2022-11-18T09:58:03Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1364/osac.437549 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2021-11-30T20:07:53Z date_updated: 2021-11-30T20:19:15Z file_id: '28197' file_name: 2021-11 Hammer - OSA Continuum - Trenches.pdf file_size: 6618403 relation: main_file file_date_updated: 2021-11-30T20:19:15Z has_accepted_license: '1' intvolume: ' 4' issue: '12' keyword: - tet_topic_waveguide language: - iso: eng oa: '1' page: '3081' project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C publication: OSA Continuum publication_identifier: issn: - 2578-7519 publication_status: published status: public title: Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics type: journal_article user_id: '477' volume: 4 year: '2021' ... --- _id: '23728' abstract: - lang: eng text: We demonstrate the integration of amorphous tungsten silicide superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides. We show proof-of-principle detection of evanescently coupled photons of 1550 nm wavelength using bidirectional waveguide coupling for two orthogonal polarization directions. We investigate the internal detection efficiency as well as detector absorption using coupling-independent characterization measurements. Furthermore, we describe strategies to improve the yield and efficiency of these devices. article_type: original author: - first_name: Jan Philipp full_name: Höpker, Jan Philipp id: '33913' last_name: Höpker - first_name: Varun B full_name: Verma, Varun B last_name: Verma - first_name: Maximilian full_name: Protte, Maximilian id: '46170' last_name: Protte - first_name: Raimund full_name: Ricken, Raimund last_name: Ricken - first_name: Viktor full_name: Quiring, Viktor last_name: Quiring - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Richard P full_name: Mirin, Richard P last_name: Mirin - first_name: Sae full_name: Woo Nam, Sae last_name: Woo Nam - first_name: Tim full_name: Bartley, Tim id: '49683' last_name: Bartley citation: ama: 'Höpker JP, Verma VB, Protte M, et al. Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides. Journal of Physics: Photonics. 2021;3:034022. doi:10.1088/2515-7647/ac105b' apa: 'Höpker, J. P., Verma, V. B., Protte, M., Ricken, R., Quiring, V., Eigner, C., Ebers, L., Hammer, M., Förstner, J., Silberhorn, C., Mirin, R. P., Woo Nam, S., & Bartley, T. (2021). Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides. Journal of Physics: Photonics, 3, 034022. https://doi.org/10.1088/2515-7647/ac105b' bibtex: '@article{Höpker_Verma_Protte_Ricken_Quiring_Eigner_Ebers_Hammer_Förstner_Silberhorn_et al._2021, title={Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides}, volume={3}, DOI={10.1088/2515-7647/ac105b}, journal={Journal of Physics: Photonics}, author={Höpker, Jan Philipp and Verma, Varun B and Protte, Maximilian and Ricken, Raimund and Quiring, Viktor and Eigner, Christof and Ebers, Lena and Hammer, Manfred and Förstner, Jens and Silberhorn, Christine and et al.}, year={2021}, pages={034022} }' chicago: 'Höpker, Jan Philipp, Varun B Verma, Maximilian Protte, Raimund Ricken, Viktor Quiring, Christof Eigner, Lena Ebers, et al. “Integrated Superconducting Nanowire Single-Photon Detectors on Titanium in-Diffused Lithium Niobate Waveguides.” Journal of Physics: Photonics 3 (2021): 034022. https://doi.org/10.1088/2515-7647/ac105b.' ieee: 'J. P. Höpker et al., “Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides,” Journal of Physics: Photonics, vol. 3, p. 034022, 2021, doi: 10.1088/2515-7647/ac105b.' mla: 'Höpker, Jan Philipp, et al. “Integrated Superconducting Nanowire Single-Photon Detectors on Titanium in-Diffused Lithium Niobate Waveguides.” Journal of Physics: Photonics, vol. 3, 2021, p. 034022, doi:10.1088/2515-7647/ac105b.' short: 'J.P. Höpker, V.B. Verma, M. Protte, R. Ricken, V. Quiring, C. Eigner, L. Ebers, M. Hammer, J. Förstner, C. Silberhorn, R.P. Mirin, S. Woo Nam, T. Bartley, Journal of Physics: Photonics 3 (2021) 034022.' date_created: 2021-09-03T08:04:06Z date_updated: 2022-10-25T07:34:42Z ddc: - '530' department: - _id: '15' - _id: '61' - _id: '230' doi: 10.1088/2515-7647/ac105b file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2021-09-07T07:41:04Z date_updated: 2021-09-07T07:41:04Z file_id: '23825' file_name: 2021-07 Höpker J._Phys._Photonics_3_034022.pdf file_size: 1097820 relation: main_file file_date_updated: 2021-09-07T07:41:04Z has_accepted_license: '1' intvolume: ' 3' language: - iso: eng oa: '1' page: '034022' project: - _id: '53' name: TRR 142 publication: 'Journal of Physics: Photonics' publication_identifier: issn: - 2515-7647 publication_status: published status: public title: Integrated superconducting nanowire single-photon detectors on titanium in-diffused lithium niobate waveguides type: journal_article user_id: '49683' volume: 3 year: '2021' ... --- _id: '21932' abstract: - lang: eng text: Gaussian-beam-like bundles of semi-guided waves propagating in a dielectric slab can excite modes with high-order optical angular momentum supported by a circular fiber. We consider a multimode step-index fiber with a high-index coating, where the waves in the slab are evanescently coupled to the modes of the fiber. Conditions for effective resonant interaction are identified. Based on a hybrid analytical–numerical coupled mode model, our simulations predict that substantial fractions of the input power can be focused into waves with specific orbital angular momentum, of excellent purity, with a clear distinction between degenerate modes with opposite vorticity. author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Hammer M, Ebers L, Förstner J. Resonant evanescent excitation of guided waves with high-order optical angular momentum. Journal of the Optical Society of America B. 2021;38(5):1717. doi:10.1364/josab.422731 apa: Hammer, M., Ebers, L., & Förstner, J. (2021). Resonant evanescent excitation of guided waves with high-order optical angular momentum. Journal of the Optical Society of America B, 38(5), 1717. https://doi.org/10.1364/josab.422731 bibtex: '@article{Hammer_Ebers_Förstner_2021, title={Resonant evanescent excitation of guided waves with high-order optical angular momentum}, volume={38}, DOI={10.1364/josab.422731}, number={5}, journal={Journal of the Optical Society of America B}, author={Hammer, Manfred and Ebers, Lena and Förstner, Jens}, year={2021}, pages={1717} }' chicago: 'Hammer, Manfred, Lena Ebers, and Jens Förstner. “Resonant Evanescent Excitation of Guided Waves with High-Order Optical Angular Momentum.” Journal of the Optical Society of America B 38, no. 5 (2021): 1717. https://doi.org/10.1364/josab.422731.' ieee: M. Hammer, L. Ebers, and J. Förstner, “Resonant evanescent excitation of guided waves with high-order optical angular momentum,” Journal of the Optical Society of America B, vol. 38, no. 5, p. 1717, 2021. mla: Hammer, Manfred, et al. “Resonant Evanescent Excitation of Guided Waves with High-Order Optical Angular Momentum.” Journal of the Optical Society of America B, vol. 38, no. 5, 2021, p. 1717, doi:10.1364/josab.422731. short: M. Hammer, L. Ebers, J. Förstner, Journal of the Optical Society of America B 38 (2021) 1717. date_created: 2021-04-30T11:54:03Z date_updated: 2022-01-06T06:55:20Z ddc: - '530' department: - _id: '61' - _id: '230' doi: 10.1364/josab.422731 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2021-04-30T11:57:14Z date_updated: 2021-04-30T11:57:14Z file_id: '21933' file_name: oamex.pdf file_size: 1963211 relation: main_file - access_level: local content_type: application/pdf creator: fossie date_created: 2021-04-30T11:59:16Z date_updated: 2021-04-30T11:59:16Z embargo: 2022-05-01 embargo_to: open_access file_id: '21934' file_name: 2021-04 Hammer - JOSA B - Resonant evanescent excitation of guides waves with high-order angular momentum.pdf file_size: 7750006 relation: main_file file_date_updated: 2021-04-30T11:59:16Z has_accepted_license: '1' intvolume: ' 38' issue: '5' keyword: - tet_topic_waveguides language: - iso: eng oa: '1' page: '1717' project: - _id: '56' name: TRR 142 - Project Area C - _id: '53' name: TRR 142 - _id: '75' name: TRR 142 - Subproject C5 publication: Journal of the Optical Society of America B publication_identifier: issn: - 0740-3224 - 1520-8540 publication_status: published status: public title: Resonant evanescent excitation of guided waves with high-order optical angular momentum type: journal_article user_id: '158' volume: 38 year: '2021' ... --- _id: '21821' abstract: - lang: eng text: We present a combined experimental and numerical study of the far-field emission properties of optical travelling wave antennas made from low-loss dielectric materials. The antennas considered here are composed of two simple building blocks, a director and a reflector, deposited on a glass substrate. Colloidal quantum dots placed in the feed gap between the two elements serve as internal light source. The emission profile of the antenna is mainly formed by the director while the reflector suppresses backward emission. Systematic studies of the director dimensions as well as variation of antenna material show that the effective refractive index of the director primarily governs the far-field emission pattern. Below cut off, i.e., if the director’s effective refractive index is smaller than the refractive index of the substrate, the main lobe results from leaky wave emission along the director. In contrast, if the director supports a guided mode, the emission predominately originates from the end facet of the director. article_number: '14694' author: - first_name: T. full_name: Leuteritz, T. last_name: Leuteritz - first_name: H. full_name: Farheen, H. last_name: Farheen - first_name: S. full_name: Qiao, S. last_name: Qiao - first_name: F. full_name: Spreyer, F. last_name: Spreyer - first_name: Christian full_name: Schlickriede, Christian id: '59792' last_name: Schlickriede - first_name: Thomas full_name: Zentgraf, Thomas id: '30525' last_name: Zentgraf orcid: 0000-0002-8662-1101 - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: S. full_name: Linden, S. last_name: Linden citation: ama: Leuteritz T, Farheen H, Qiao S, et al. Dielectric travelling wave antennas for directional light emission. Optics Express. 2021;29(10). doi:10.1364/oe.422984 apa: Leuteritz, T., Farheen, H., Qiao, S., Spreyer, F., Schlickriede, C., Zentgraf, T., … Linden, S. (2021). Dielectric travelling wave antennas for directional light emission. Optics Express, 29(10). https://doi.org/10.1364/oe.422984 bibtex: '@article{Leuteritz_Farheen_Qiao_Spreyer_Schlickriede_Zentgraf_Myroshnychenko_Förstner_Linden_2021, title={Dielectric travelling wave antennas for directional light emission}, volume={29}, DOI={10.1364/oe.422984}, number={1014694}, journal={Optics Express}, author={Leuteritz, T. and Farheen, H. and Qiao, S. and Spreyer, F. and Schlickriede, Christian and Zentgraf, Thomas and Myroshnychenko, Viktor and Förstner, Jens and Linden, S.}, year={2021} }' chicago: Leuteritz, T., H. Farheen, S. Qiao, F. Spreyer, Christian Schlickriede, Thomas Zentgraf, Viktor Myroshnychenko, Jens Förstner, and S. Linden. “Dielectric Travelling Wave Antennas for Directional Light Emission.” Optics Express 29, no. 10 (2021). https://doi.org/10.1364/oe.422984. ieee: T. Leuteritz et al., “Dielectric travelling wave antennas for directional light emission,” Optics Express, vol. 29, no. 10, 2021. mla: Leuteritz, T., et al. “Dielectric Travelling Wave Antennas for Directional Light Emission.” Optics Express, vol. 29, no. 10, 14694, 2021, doi:10.1364/oe.422984. short: T. Leuteritz, H. Farheen, S. Qiao, F. Spreyer, C. Schlickriede, T. Zentgraf, V. Myroshnychenko, J. Förstner, S. Linden, Optics Express 29 (2021). date_created: 2021-04-29T06:56:40Z date_updated: 2022-01-06T06:55:17Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' - _id: '15' - _id: '289' doi: 10.1364/oe.422984 file: - access_level: closed content_type: application/pdf creator: fossie date_created: 2021-04-29T06:59:39Z date_updated: 2021-04-29T06:59:39Z file_id: '21822' file_name: 2021-04 Leuteritz - Optics Express - Dielectric travelling wave antennas.pdf file_size: 7464073 relation: main_file success: 1 file_date_updated: 2021-04-29T06:59:39Z has_accepted_license: '1' intvolume: ' 29' issue: '10' keyword: - tet_topic_opticalantenna language: - iso: eng project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C - _id: '75' name: TRR 142 - Subproject C5 publication: Optics Express publication_identifier: issn: - 1094-4087 publication_status: published status: public title: Dielectric travelling wave antennas for directional light emission type: journal_article user_id: '30525' volume: 29 year: '2021' ... --- _id: '39966' author: - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: A. full_name: Widhalm, A. last_name: Widhalm - first_name: A. full_name: Mukherjee, A. last_name: Mukherjee - first_name: S. full_name: Krehs, S. last_name: Krehs - first_name: B. full_name: Jonas, B. last_name: Jonas - first_name: K. full_name: Spychala, K. last_name: Spychala - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Andreas full_name: Thiede, Andreas id: '538' last_name: Thiede - first_name: Dirk full_name: Reuter, Dirk id: '37763' last_name: Reuter - first_name: Artur full_name: Zrenner, Artur id: '606' last_name: Zrenner orcid: 0000-0002-5190-0944 citation: ama: 'Förstner J, Widhalm A, Mukherjee A, et al. Ultrafast electric control of a single QD exciton. In: 11th International Conference on Quantum Dots. ; 2020.' apa: Förstner, J., Widhalm, A., Mukherjee, A., Krehs, S., Jonas, B., Spychala, K., Förstner, J., Thiede, A., Reuter, D., & Zrenner, A. (2020). Ultrafast electric control of a single QD exciton. 11th International Conference on Quantum Dots. bibtex: '@inproceedings{Förstner_Widhalm_Mukherjee_Krehs_Jonas_Spychala_Förstner_Thiede_Reuter_Zrenner_2020, place={Munich/Germany}, title={Ultrafast electric control of a single QD exciton}, booktitle={11th International Conference on Quantum Dots}, author={Förstner, Jens and Widhalm, A. and Mukherjee, A. and Krehs, S. and Jonas, B. and Spychala, K. and Förstner, Jens and Thiede, Andreas and Reuter, Dirk and Zrenner, Artur}, year={2020} }' chicago: Förstner, Jens, A. Widhalm, A. Mukherjee, S. Krehs, B. Jonas, K. Spychala, Jens Förstner, Andreas Thiede, Dirk Reuter, and Artur Zrenner. “Ultrafast Electric Control of a Single QD Exciton.” In 11th International Conference on Quantum Dots. Munich/Germany, 2020. ieee: J. Förstner et al., “Ultrafast electric control of a single QD exciton,” 2020. mla: Förstner, Jens, et al. “Ultrafast Electric Control of a Single QD Exciton.” 11th International Conference on Quantum Dots, 2020. short: 'J. Förstner, A. Widhalm, A. Mukherjee, S. Krehs, B. Jonas, K. Spychala, J. Förstner, A. Thiede, D. Reuter, A. Zrenner, in: 11th International Conference on Quantum Dots, Munich/Germany, 2020.' date_created: 2023-01-25T11:11:42Z date_updated: 2023-01-25T11:11:53Z department: - _id: '61' - _id: '230' - _id: '429' - _id: '51' language: - iso: eng place: Munich/Germany publication: 11th International Conference on Quantum Dots status: public title: Ultrafast electric control of a single QD exciton type: conference_abstract user_id: '158' year: '2020' ... --- _id: '17322' author: - first_name: Amlan full_name: Mukherjee, Amlan last_name: Mukherjee - first_name: Alex full_name: Widhalm, Alex last_name: Widhalm - first_name: Dustin full_name: Siebert, Dustin last_name: Siebert - first_name: Sebastian full_name: Krehs, Sebastian last_name: Krehs - first_name: Nandlal full_name: Sharma, Nandlal last_name: Sharma - first_name: Andreas full_name: Thiede, Andreas id: '538' last_name: Thiede - first_name: Dirk full_name: Reuter, Dirk id: '37763' last_name: Reuter - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Artur full_name: Zrenner, Artur id: '606' last_name: Zrenner orcid: 0000-0002-5190-0944 citation: ama: Mukherjee A, Widhalm A, Siebert D, et al. Electrically controlled rapid adiabatic passage in a single quantum dot. Applied Physics Letters. 2020;116:251103. doi:10.1063/5.0012257 apa: Mukherjee, A., Widhalm, A., Siebert, D., Krehs, S., Sharma, N., Thiede, A., Reuter, D., Förstner, J., & Zrenner, A. (2020). Electrically controlled rapid adiabatic passage in a single quantum dot. Applied Physics Letters, 116, 251103. https://doi.org/10.1063/5.0012257 bibtex: '@article{Mukherjee_Widhalm_Siebert_Krehs_Sharma_Thiede_Reuter_Förstner_Zrenner_2020, title={Electrically controlled rapid adiabatic passage in a single quantum dot}, volume={116}, DOI={10.1063/5.0012257}, journal={Applied Physics Letters}, author={Mukherjee, Amlan and Widhalm, Alex and Siebert, Dustin and Krehs, Sebastian and Sharma, Nandlal and Thiede, Andreas and Reuter, Dirk and Förstner, Jens and Zrenner, Artur}, year={2020}, pages={251103} }' chicago: 'Mukherjee, Amlan, Alex Widhalm, Dustin Siebert, Sebastian Krehs, Nandlal Sharma, Andreas Thiede, Dirk Reuter, Jens Förstner, and Artur Zrenner. “Electrically Controlled Rapid Adiabatic Passage in a Single Quantum Dot.” Applied Physics Letters 116 (2020): 251103. https://doi.org/10.1063/5.0012257.' ieee: 'A. Mukherjee et al., “Electrically controlled rapid adiabatic passage in a single quantum dot,” Applied Physics Letters, vol. 116, p. 251103, 2020, doi: 10.1063/5.0012257.' mla: Mukherjee, Amlan, et al. “Electrically Controlled Rapid Adiabatic Passage in a Single Quantum Dot.” Applied Physics Letters, vol. 116, 2020, p. 251103, doi:10.1063/5.0012257. short: A. Mukherjee, A. Widhalm, D. Siebert, S. Krehs, N. Sharma, A. Thiede, D. Reuter, J. Förstner, A. Zrenner, Applied Physics Letters 116 (2020) 251103. date_created: 2020-06-25T12:31:42Z date_updated: 2023-01-24T11:12:09Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' - _id: '51' doi: 10.1063/5.0012257 file: - access_level: request content_type: application/pdf creator: fossie date_created: 2020-06-25T12:45:04Z date_updated: 2022-01-06T06:53:07Z embargo: 2021-06-25 embargo_to: open_access file_id: '17325' file_name: 2020-06 Widhalm - APL - Electrically controlled RAP in single QD (official).pdf file_size: 1359326 relation: main_file file_date_updated: 2022-01-06T06:53:07Z has_accepted_license: '1' intvolume: ' 116' keyword: - tet_topic_qd language: - iso: eng page: '251103' project: - _id: '56' name: TRR 142 - Project Area C - _id: '74' name: TRR 142 - Subproject C4 - _id: '53' name: TRR 142 - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Applied Physics Letters publication_identifier: issn: - 0003-6951 - 1077-3118 publication_status: published status: public title: Electrically controlled rapid adiabatic passage in a single quantum dot type: journal_article user_id: '158' volume: 116 year: '2020' ... --- _id: '21719' abstract: - lang: eng text: We fabricate silicon tapers to increase the mode overlap of superconducting detectors on Ti:LiNbO3 waveguides. Mode images show a reduction in mode size from 6 µm to 2 µm FWHM, agreeing with beam propagation simulations. article_number: QTh7A.8 author: - first_name: Maximilian full_name: Protte, Maximilian id: '46170' last_name: Protte - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Jan Philipp full_name: Höpker, Jan Philipp id: '33913' last_name: Höpker - first_name: Maximilian full_name: Albert, Maximilian last_name: Albert - first_name: Viktor full_name: Quiring, Viktor last_name: Quiring - first_name: Cedrik full_name: Meier, Cedrik id: '20798' last_name: Meier orcid: https://orcid.org/0000-0002-3787-3572 - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Tim full_name: Bartley, Tim id: '49683' last_name: Bartley citation: ama: 'Protte M, Ebers L, Hammer M, et al. Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics. In: OSA Quantum 2.0 Conference. ; 2020. doi:10.1364/quantum.2020.qth7a.8' apa: Protte, M., Ebers, L., Hammer, M., Höpker, J. P., Albert, M., Quiring, V., Meier, C., Förstner, J., Silberhorn, C., & Bartley, T. (2020). Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics. OSA Quantum 2.0 Conference, Article QTh7A.8. https://doi.org/10.1364/quantum.2020.qth7a.8 bibtex: '@inproceedings{Protte_Ebers_Hammer_Höpker_Albert_Quiring_Meier_Förstner_Silberhorn_Bartley_2020, title={Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics}, DOI={10.1364/quantum.2020.qth7a.8}, number={QTh7A.8}, booktitle={OSA Quantum 2.0 Conference}, author={Protte, Maximilian and Ebers, Lena and Hammer, Manfred and Höpker, Jan Philipp and Albert, Maximilian and Quiring, Viktor and Meier, Cedrik and Förstner, Jens and Silberhorn, Christine and Bartley, Tim}, year={2020} }' chicago: Protte, Maximilian, Lena Ebers, Manfred Hammer, Jan Philipp Höpker, Maximilian Albert, Viktor Quiring, Cedrik Meier, Jens Förstner, Christine Silberhorn, and Tim Bartley. “Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics.” In OSA Quantum 2.0 Conference, 2020. https://doi.org/10.1364/quantum.2020.qth7a.8. ieee: 'M. Protte et al., “Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics,” 2020, doi: 10.1364/quantum.2020.qth7a.8.' mla: Protte, Maximilian, et al. “Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics.” OSA Quantum 2.0 Conference, QTh7A.8, 2020, doi:10.1364/quantum.2020.qth7a.8. short: 'M. Protte, L. Ebers, M. Hammer, J.P. Höpker, M. Albert, V. Quiring, C. Meier, J. Förstner, C. Silberhorn, T. Bartley, in: OSA Quantum 2.0 Conference, 2020.' date_created: 2021-04-22T15:56:45Z date_updated: 2022-10-25T07:41:15Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' - _id: '15' doi: 10.1364/quantum.2020.qth7a.8 file: - access_level: closed content_type: application/pdf creator: fossie date_created: 2021-04-22T15:58:52Z date_updated: 2021-04-22T15:58:52Z file_id: '21720' file_name: Quantum2.0-Towards SSC hybrid integration for quantum photonics[4936].pdf file_size: 1704199 relation: main_file success: 1 file_date_updated: 2021-04-22T15:58:52Z has_accepted_license: '1' keyword: - tet_topic_waveguide language: - iso: eng publication: OSA Quantum 2.0 Conference publication_identifier: isbn: - '9781943580811' publication_status: published status: public title: Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics type: conference user_id: '49683' year: '2020' ... --- _id: '20372' abstract: - lang: eng text: A stepwise angular spectrum method (SASM) for curved interfaces is presented to calculate the wave propagation in planar lens-like integrated optical structures based on photonic slab waveguides. The method is derived and illustrated for an effective 2D setup first and then for 3D slab waveguide lenses. We employ slab waveguides of different thicknesses connected by curved surfaces to realize a lens-like structure. To simulate the wave propagation in 3D including reflection and scattering losses, the stepwise angular spectrum method is combined with full vectorial finite element computations for subproblems with lower complexity. Our SASM results show excellent agreement with rigorous numerical simulations of the full structures with a substantially lower computational effort and can be utilized for the simulation-based design and optimization of complex and large scale setups. author: - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Ebers L, Hammer M, Förstner J. Light diffraction in slab waveguide lenses simulated with the stepwise angular spectrum method. Optics Express. 2020;28(24):36361. doi:10.1364/oe.409612 apa: Ebers, L., Hammer, M., & Förstner, J. (2020). Light diffraction in slab waveguide lenses simulated with the stepwise angular spectrum method. Optics Express, 28(24), 36361. https://doi.org/10.1364/oe.409612 bibtex: '@article{Ebers_Hammer_Förstner_2020, title={Light diffraction in slab waveguide lenses simulated with the stepwise angular spectrum method}, volume={28}, DOI={10.1364/oe.409612}, number={24}, journal={Optics Express}, author={Ebers, Lena and Hammer, Manfred and Förstner, Jens}, year={2020}, pages={36361} }' chicago: 'Ebers, Lena, Manfred Hammer, and Jens Förstner. “Light Diffraction in Slab Waveguide Lenses Simulated with the Stepwise Angular Spectrum Method.” Optics Express 28, no. 24 (2020): 36361. https://doi.org/10.1364/oe.409612.' ieee: L. Ebers, M. Hammer, and J. Förstner, “Light diffraction in slab waveguide lenses simulated with the stepwise angular spectrum method,” Optics Express, vol. 28, no. 24, p. 36361, 2020. mla: Ebers, Lena, et al. “Light Diffraction in Slab Waveguide Lenses Simulated with the Stepwise Angular Spectrum Method.” Optics Express, vol. 28, no. 24, 2020, p. 36361, doi:10.1364/oe.409612. short: L. Ebers, M. Hammer, J. Förstner, Optics Express 28 (2020) 36361. date_created: 2020-11-17T09:52:47Z date_updated: 2022-01-06T06:54:26Z department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1364/oe.409612 intvolume: ' 28' issue: '24' keyword: - tet_topic_waveguides language: - iso: eng page: '36361' project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C - _id: '74' name: TRR 142 - Subproject C4 - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Optics Express publication_identifier: issn: - 1094-4087 publication_status: published status: public title: Light diffraction in slab waveguide lenses simulated with the stepwise angular spectrum method type: journal_article user_id: '158' volume: 28 year: '2020' ... --- _id: '20233' abstract: - lang: eng text: The challenge of designing new tunable nonlinear dielectric materials with tailored properties has attracted an increasing amount of interest recently. Herein, we study the effective nonlinear dielectric response of a stochastic paraelectric-dielectric composite consisting of equilibrium distributions of circular and partially penetrable disks (or parallel, infinitely long, identical, partially penetrable, circular cylinders) of a dielectric phase randomly dispersed in a continuous matrix of a paraelectric phase. The random microstructures were generated using the Metropolis Monte Carlo algorithm. The evaluation of the effective permittivity and tunability were carried out by employing either a Landau thermodynamic model or its Johnson’s approximation to describe the field-dependent permittivity of the paraelectric phase and solving continuum-electrostatics equations using finite element calculations. We reveal that the percolation threshold in this composite governs the critical behavior of the effective permittivity and tunability. For microstructures below the percolation threshold, our simulations demonstrate a strong nonlinear behaviour of the field-dependent effective permittivity and very high tunability that increases as a function of dielectric phase concentration. Above the percolation threshold, the effective permittivity shows the tendency to linearization and the tunability dramatically drops down. The highly reduced permittivity and extraordinarily high tunability are obtained for the composites with dielectric impenetrable disks at high concentrations, in which the triggering of the percolation transition is avoided. The reported results cast light on distinct nonlinear behaviour of 2D and 3D stochastic composites and can guide the design of novel composites with the controlled morphology and tailored permittivity and tunability. author: - first_name: Viktor full_name: Myroshnychenko, Viktor id: '46371' last_name: Myroshnychenko - first_name: Stanislav full_name: Smirnov, Stanislav last_name: Smirnov - first_name: Pious Mathews Mulavarickal full_name: Jose, Pious Mathews Mulavarickal last_name: Jose - first_name: Christian full_name: Brosseau, Christian last_name: Brosseau - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Myroshnychenko V, Smirnov S, Jose PMM, Brosseau C, Förstner J. Nonlinear dielectric properties of random paraelectric-dielectric composites. Acta Materialia. 2020;203:116432. doi:10.1016/j.actamat.2020.10.051 apa: Myroshnychenko, V., Smirnov, S., Jose, P. M. M., Brosseau, C., & Förstner, J. (2020). Nonlinear dielectric properties of random paraelectric-dielectric composites. Acta Materialia, 203, 116432. https://doi.org/10.1016/j.actamat.2020.10.051 bibtex: '@article{Myroshnychenko_Smirnov_Jose_Brosseau_Förstner_2020, title={Nonlinear dielectric properties of random paraelectric-dielectric composites}, volume={203}, DOI={10.1016/j.actamat.2020.10.051}, journal={Acta Materialia}, author={Myroshnychenko, Viktor and Smirnov, Stanislav and Jose, Pious Mathews Mulavarickal and Brosseau, Christian and Förstner, Jens}, year={2020}, pages={116432} }' chicago: 'Myroshnychenko, Viktor, Stanislav Smirnov, Pious Mathews Mulavarickal Jose, Christian Brosseau, and Jens Förstner. “Nonlinear Dielectric Properties of Random Paraelectric-Dielectric Composites.” Acta Materialia 203 (2020): 116432. https://doi.org/10.1016/j.actamat.2020.10.051.' ieee: V. Myroshnychenko, S. Smirnov, P. M. M. Jose, C. Brosseau, and J. Förstner, “Nonlinear dielectric properties of random paraelectric-dielectric composites,” Acta Materialia, vol. 203, p. 116432, 2020. mla: Myroshnychenko, Viktor, et al. “Nonlinear Dielectric Properties of Random Paraelectric-Dielectric Composites.” Acta Materialia, vol. 203, 2020, p. 116432, doi:10.1016/j.actamat.2020.10.051. short: V. Myroshnychenko, S. Smirnov, P.M.M. Jose, C. Brosseau, J. Förstner, Acta Materialia 203 (2020) 116432. date_created: 2020-10-30T13:51:42Z date_updated: 2022-01-06T06:54:24Z ddc: - '530' department: - _id: '61' - _id: '230' doi: 10.1016/j.actamat.2020.10.051 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2020-10-30T13:52:58Z date_updated: 2020-10-30T13:52:58Z file_id: '20234' file_name: 2020-10 Myroshnychenko - Acta Material (accepted preprint)_compressed.pdf file_size: 3934721 relation: main_file title: (Accepted Preprint) file_date_updated: 2020-10-30T13:52:58Z has_accepted_license: '1' intvolume: ' 203' language: - iso: eng oa: '1' page: '116432' project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Acta Materialia publication_identifier: issn: - 1359-6454 publication_status: published status: public title: Nonlinear dielectric properties of random paraelectric-dielectric composites type: journal_article user_id: '158' volume: 203 year: '2020' ... --- _id: '20189' abstract: - lang: eng text: A dielectric step-index optical fiber with tube-like profile is considered, being positioned with a small gap on top of a dielectric slab waveguide. We propose a 2.5-D hybrid analytical/numerical coupled mode model for the evanescent excitation of the tube through semi-guided waves propagating in the slab at oblique angles. The model combines the directional polarized modes supported by the slab with analytic solutions for the TE-, TM-, and orbital-angular-momentum (OAM) modes of the tube-shaped fiber. Implementational details of the scheme are discussed, complemented by finite-element simulations for verification purposes. Our results include configurations with resonant in-fiber excitation of OAM modes with large orbital angular momentum and strong field enhancement. article_number: '472' author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Hammer M, Ebers L, Förstner J. Hybrid coupled mode modelling of the evanescent excitation of a dielectric tube by semi-guided waves at oblique angles. Optical and Quantum Electronics. 2020;52. doi:10.1007/s11082-020-02595-z apa: Hammer, M., Ebers, L., & Förstner, J. (2020). Hybrid coupled mode modelling of the evanescent excitation of a dielectric tube by semi-guided waves at oblique angles. Optical and Quantum Electronics, 52. https://doi.org/10.1007/s11082-020-02595-z bibtex: '@article{Hammer_Ebers_Förstner_2020, title={Hybrid coupled mode modelling of the evanescent excitation of a dielectric tube by semi-guided waves at oblique angles}, volume={52}, DOI={10.1007/s11082-020-02595-z}, number={472}, journal={Optical and Quantum Electronics}, author={Hammer, Manfred and Ebers, Lena and Förstner, Jens}, year={2020} }' chicago: Hammer, Manfred, Lena Ebers, and Jens Förstner. “Hybrid Coupled Mode Modelling of the Evanescent Excitation of a Dielectric Tube by Semi-Guided Waves at Oblique Angles.” Optical and Quantum Electronics 52 (2020). https://doi.org/10.1007/s11082-020-02595-z. ieee: M. Hammer, L. Ebers, and J. Förstner, “Hybrid coupled mode modelling of the evanescent excitation of a dielectric tube by semi-guided waves at oblique angles,” Optical and Quantum Electronics, vol. 52, 2020. mla: Hammer, Manfred, et al. “Hybrid Coupled Mode Modelling of the Evanescent Excitation of a Dielectric Tube by Semi-Guided Waves at Oblique Angles.” Optical and Quantum Electronics, vol. 52, 472, 2020, doi:10.1007/s11082-020-02595-z. short: M. Hammer, L. Ebers, J. Förstner, Optical and Quantum Electronics 52 (2020). date_created: 2020-10-24T08:03:58Z date_updated: 2022-01-06T06:54:22Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1007/s11082-020-02595-z file: - access_level: closed content_type: application/pdf creator: fossie date_created: 2020-10-24T08:11:40Z date_updated: 2020-10-24T08:11:40Z file_id: '20190' file_name: 2020-10 Hammer - OQE - Hybrid Coupled Mode Modelling Dielectric Tube.pdf file_size: 2212769 relation: main_file success: 1 file_date_updated: 2020-10-24T08:11:40Z has_accepted_license: '1' intvolume: ' 52' keyword: - tet_topic_waveguides language: - iso: eng project: - _id: '56' name: TRR 142 - Project Area C - _id: '75' name: TRR 142 - Subproject C5 - _id: '53' name: TRR 142 publication: Optical and Quantum Electronics publication_identifier: issn: - 0306-8919 - 1572-817X publication_status: published status: public title: Hybrid coupled mode modelling of the evanescent excitation of a dielectric tube by semi-guided waves at oblique angles type: journal_article user_id: '158' volume: 52 year: '2020' ... --- _id: '17803' abstract: - lang: eng text: We numerically simulate multiple light scattering in discrete disordered media represented by large clusters of irregular non-absorbing particles. The packing density of clusters is 0.5. With such conditions diffuse scattering is significantly reduced and light transport follows propagation channels that are determined by the particle size and topology of the medium. This kind of localization produces coherent backscattering intensity surge and enhanced negative polarization branch if compared to lower density samples. author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Grynko Y, Shkuratov Y, Förstner J. Light backscattering from large clusters of densely packed irregular particles. Journal of Quantitative Spectroscopy and Radiative Transfer. 2020;255:107234. doi:10.1016/j.jqsrt.2020.107234 apa: Grynko, Y., Shkuratov, Y., & Förstner, J. (2020). Light backscattering from large clusters of densely packed irregular particles. Journal of Quantitative Spectroscopy and Radiative Transfer, 255, 107234. https://doi.org/10.1016/j.jqsrt.2020.107234 bibtex: '@article{Grynko_Shkuratov_Förstner_2020, title={Light backscattering from large clusters of densely packed irregular particles}, volume={255}, DOI={10.1016/j.jqsrt.2020.107234}, journal={Journal of Quantitative Spectroscopy and Radiative Transfer}, author={Grynko, Yevgen and Shkuratov, Yuriy and Förstner, Jens}, year={2020}, pages={107234} }' chicago: 'Grynko, Yevgen, Yuriy Shkuratov, and Jens Förstner. “Light Backscattering from Large Clusters of Densely Packed Irregular Particles.” Journal of Quantitative Spectroscopy and Radiative Transfer 255 (2020): 107234. https://doi.org/10.1016/j.jqsrt.2020.107234.' ieee: Y. Grynko, Y. Shkuratov, and J. Förstner, “Light backscattering from large clusters of densely packed irregular particles,” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 255, p. 107234, 2020. mla: Grynko, Yevgen, et al. “Light Backscattering from Large Clusters of Densely Packed Irregular Particles.” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 255, 2020, p. 107234, doi:10.1016/j.jqsrt.2020.107234. short: Y. Grynko, Y. Shkuratov, J. Förstner, Journal of Quantitative Spectroscopy and Radiative Transfer 255 (2020) 107234. date_created: 2020-08-11T09:07:04Z date_updated: 2022-01-06T06:53:20Z ddc: - '530' department: - _id: '61' - _id: '230' doi: 10.1016/j.jqsrt.2020.107234 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2020-08-11T15:24:31Z date_updated: 2020-08-11T15:24:31Z file_id: '17814' file_name: 2020-08 Grynko - JQSRT PREPRINT - Large Cluster.pdf file_size: 1567605 relation: main_file title: Preprint file_date_updated: 2020-08-11T15:24:31Z has_accepted_license: '1' intvolume: ' 255' keyword: - tet_topic_scattering language: - iso: eng oa: '1' page: '107234' project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: Journal of Quantitative Spectroscopy and Radiative Transfer publication_identifier: issn: - 0022-4073 publication_status: published status: public title: Light backscattering from large clusters of densely packed irregular particles type: journal_article user_id: '158' volume: 255 year: '2020' ... --- _id: '8634' abstract: - lang: eng text: "A rectangular dielectric strip at some distance above an optical slab waveguide is\r\nbeing considered, for evanescent excitation of the strip through the semi-guided waves supported\r\nby the slab, at specific oblique angles. The 2.5-D configuration shows resonant transmission\r\nproperties with respect to variations of the angle of incidence, or of the excitation frequency,\r\nrespectively. The strength of the interaction can be controlled by the gap between strip and slab.\r\nFor increasing distance, our simulations predict resonant states with unit extremal reflectance\r\nof an angular or spectral width that tends to zero, i.e. resonances with a Q-factor that tends\r\nto infinity, while the resonance position approaches the level of the guided mode of the strip.\r\nThis exceptionally simple system realizes what might be termed a “bound state coupled to the\r\ncontinuum”." article_type: original author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Hammer M, Ebers L, Förstner J. Oblique evanescent excitation of a dielectric strip: A model resonator with an open optical cavity of unlimited Q. Optics Express. 2019;27(7):8. doi:10.1364/OE.27.009313' apa: 'Hammer, M., Ebers, L., & Förstner, J. (2019). Oblique evanescent excitation of a dielectric strip: A model resonator with an open optical cavity of unlimited Q. Optics Express, 27(7), 8. https://doi.org/10.1364/OE.27.009313' bibtex: '@article{Hammer_Ebers_Förstner_2019, title={Oblique evanescent excitation of a dielectric strip: A model resonator with an open optical cavity of unlimited Q}, volume={27}, DOI={10.1364/OE.27.009313}, number={7}, journal={Optics Express}, author={Hammer, Manfred and Ebers, Lena and Förstner, Jens}, year={2019}, pages={8} }' chicago: 'Hammer, Manfred, Lena Ebers, and Jens Förstner. “Oblique Evanescent Excitation of a Dielectric Strip: A Model Resonator with an Open Optical Cavity of Unlimited Q.” Optics Express 27, no. 7 (2019): 8. https://doi.org/10.1364/OE.27.009313.' ieee: 'M. Hammer, L. Ebers, and J. Förstner, “Oblique evanescent excitation of a dielectric strip: A model resonator with an open optical cavity of unlimited Q,” Optics Express, vol. 27, no. 7, p. 8, 2019, doi: 10.1364/OE.27.009313.' mla: 'Hammer, Manfred, et al. “Oblique Evanescent Excitation of a Dielectric Strip: A Model Resonator with an Open Optical Cavity of Unlimited Q.” Optics Express, vol. 27, no. 7, 2019, p. 8, doi:10.1364/OE.27.009313.' short: M. Hammer, L. Ebers, J. Förstner, Optics Express 27 (2019) 8. date_created: 2019-03-26T10:39:00Z date_updated: 2023-01-03T10:34:29Z ddc: - '600' department: - _id: '61' doi: 10.1364/OE.27.009313 file: - access_level: closed content_type: application/pdf creator: nprante date_created: 2019-03-27T13:47:50Z date_updated: 2019-03-27T13:47:50Z file_id: '8714' file_name: oe-27-7-9313.pdf file_size: 2388537 relation: main_file success: 1 file_date_updated: 2019-03-27T13:47:50Z has_accepted_license: '1' intvolume: ' 27' issue: '7' keyword: - tet_topic_waveguides language: - iso: eng page: '8' publication: Optics Express status: public title: 'Oblique evanescent excitation of a dielectric strip: A model resonator with an open optical cavity of unlimited Q' type: journal_article user_id: '158' volume: 27 year: '2019' ... --- _id: '7720' abstract: - lang: ger text: 'Die Erfindung betrifft einen optischen Übergang zwischen zwei optischen Schichtwellenleitern. Dazu ist eine Anordnung vorgesehen aus einem ersten optischen Schichtwellenleiter (2) und einem zweiten optischen Schichtwellenleiter (3), wobei der erste optische Schichtwellenleiter (2) und der zweite optische Schichtwellenleiter (3) voneinander verschiedene über ihre jeweilige Länge konstante Dicken (d, r) aufweisen, der erste optische Schichtwellenleiter (2) mit dem zweiten optischen Schichtwellenleiter (3) mittels einer optischen Schichtwellenleiterstruktur (4) verbunden ist, die über ihre gesamte Länge (w) eine Dicke (h) aufweist, die zwischen der Dicke (d) des ersten optischen Schichtwellenleiters (2) und der Dicke (r) des zweiten optischen Schichtwellenleiters (3) liegt. Erfindungsgemäß ist die Dicke (h) der optischen Schichtwellenleiterstruktur (4) über die gesamte Länge (w) der optischen Schichtwellenleiterstruktur (4) konstant. Damit wird eine Möglichkeit für einen effizienten und mit geringen Verlusten behafteten Übergang zwischen zwei optischen Schichtwellenleitern mit unterschiedlicher Dicke bereitgestellt. ' - lang: eng text: The invention relates to an optical junction between two optical planar waveguides. For this purpose, an arrangement is provided of a first optical layer waveguide (2) and a second optical slab waveguide (3), wherein the first optical layer waveguide (2) and the second optical slab waveguide (3) different from each other is constant over their respective length of thicknesses (d, r ) which the first optical layer waveguide (2) with the second optical film waveguide (3) (by means of an optical layer waveguide structure 4) is connected, which (along their entire length w) has a thickness (h) which is between the thickness (d) the first optical waveguide layer (2) and the thickness (r) of the second optical waveguide layer (3). According to the invention, the thickness (h) of the optical layer waveguide structure (4) over the entire length (w) of the optical layer waveguide structure (4) constant. Thus, a possibility for an efficient and entailing low loss transition between two optical planar waveguides is provided with different thickness. application_date: 2018-04-05 application_number: '102018108110' author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers citation: ama: Hammer M, Förstner J, Ebers L. Optical transition between two optical waveguides layer and method for transmitting light. Published online 2019. apa: Hammer, M., Förstner, J., & Ebers, L. (2019). Optical transition between two optical waveguides layer and method for transmitting light. bibtex: '@article{Hammer_Förstner_Ebers_2019, title={Optical transition between two optical waveguides layer and method for transmitting light}, author={Hammer, Manfred and Förstner, Jens and Ebers, Lena}, year={2019} }' chicago: Hammer, Manfred, Jens Förstner, and Lena Ebers. “Optical Transition between Two Optical Waveguides Layer and Method for Transmitting Light,” 2019. ieee: M. Hammer, J. Förstner, and L. Ebers, “Optical transition between two optical waveguides layer and method for transmitting light.” 2019. mla: Hammer, Manfred, et al. Optical Transition between Two Optical Waveguides Layer and Method for Transmitting Light. 2019. short: M. Hammer, J. Förstner, L. Ebers, (2019). date_created: 2019-02-15T10:25:59Z date_updated: 2022-04-27T07:35:46Z ddc: - '530' department: - _id: '61' - _id: '230' file: - access_level: closed content_type: application/pdf creator: fossie date_created: 2019-02-15T10:21:08Z date_updated: 2019-02-15T10:21:08Z file_id: '7721' file_name: 2019-01-31 DE-Patentschrift_5349.pdf file_size: 155604 relation: main_file success: 1 file_date_updated: 2019-02-15T10:21:08Z has_accepted_license: '1' ipc: G02B 6/26 ipn: DE102018108110B3 keyword: - tet_topic_waveguides main_file_link: - url: https://patents.google.com/patent/DE102018108110B3/en page: '9' project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C - _id: '75' name: TRR 142 - Subproject C5 publication_date: 2019-01-31 status: public title: Optical transition between two optical waveguides layer and method for transmitting light type: patent user_id: '158' year: '2019' ... --- _id: '21462' abstract: - lang: eng text: This paper presents a new methodology by using a multiple coil array for energy transmission. The complex current strengths of the transmitting coil array are calculated by having the knowledge about of the mutual inductances and the symmetries of the transmitting coil array, so that its resulting magnetic field mainly penetrates only the receiving coil and is strongly attenuated outside. This method is used for an optimized wireless energy transmission but can also be implemented for other inductive applications. author: - first_name: Sven full_name: Lange, Sven id: '38240' last_name: Lange - first_name: Maik-Julian full_name: Büker, Maik-Julian last_name: Büker - first_name: Denis full_name: Sievers, Denis last_name: Sievers - first_name: Christian full_name: Hedayat, Christian last_name: Hedayat - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Ulrich full_name: Hilleringmann, Ulrich last_name: Hilleringmann - first_name: Thomas full_name: Otto, Thomas last_name: Otto citation: ama: 'Lange S, Büker M-J, Sievers D, et al. Method of superposing a multiple driven magnetic field to minimize stray fields around the receiver for inductive wireless power transmission. In: Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems. Berlin · Offenbach: VDE VERLAG GMBH; 2019:1-4.' apa: 'Lange, S., Büker, M.-J., Sievers, D., Hedayat, C., Förstner, J., Hilleringmann, U., & Otto, T. (2019). Method of superposing a multiple driven magnetic field to minimize stray fields around the receiver for inductive wireless power transmission. In Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems (pp. 1–4). Berlin · Offenbach: VDE VERLAG GMBH.' bibtex: '@inproceedings{Lange_Büker_Sievers_Hedayat_Förstner_Hilleringmann_Otto_2019, place={Berlin · Offenbach}, title={Method of superposing a multiple driven magnetic field to minimize stray fields around the receiver for inductive wireless power transmission}, booktitle={Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems}, publisher={VDE VERLAG GMBH}, author={Lange, Sven and Büker, Maik-Julian and Sievers, Denis and Hedayat, Christian and Förstner, Jens and Hilleringmann, Ulrich and Otto, Thomas}, year={2019}, pages={1–4} }' chicago: 'Lange, Sven, Maik-Julian Büker, Denis Sievers, Christian Hedayat, Jens Förstner, Ulrich Hilleringmann, and Thomas Otto. “Method of Superposing a Multiple Driven Magnetic Field to Minimize Stray Fields around the Receiver for Inductive Wireless Power Transmission.” In Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems, 1–4. Berlin · Offenbach: VDE VERLAG GMBH, 2019.' ieee: S. Lange et al., “Method of superposing a multiple driven magnetic field to minimize stray fields around the receiver for inductive wireless power transmission,” in Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems, Barcelona, Spain , 2019, pp. 1–4. mla: Lange, Sven, et al. “Method of Superposing a Multiple Driven Magnetic Field to Minimize Stray Fields around the Receiver for Inductive Wireless Power Transmission.” Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems, VDE VERLAG GMBH, 2019, pp. 1–4. short: 'S. Lange, M.-J. Büker, D. Sievers, C. Hedayat, J. Förstner, U. Hilleringmann, T. Otto, in: Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems, VDE VERLAG GMBH, Berlin · Offenbach, 2019, pp. 1–4.' conference: end_date: 2019-04-11 location: 'Barcelona, Spain ' name: Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems start_date: 2019-04-10 date_created: 2021-03-12T09:46:55Z date_updated: 2022-01-06T07:04:11Z department: - _id: '59' - _id: '61' - _id: '485' language: - iso: eng main_file_link: - url: https://ieeexplore.ieee.org/document/8727831 page: 1-4 place: Berlin · Offenbach publication: Smart Systems Integration; 13th International Conference and Exhibition on Integration Issues of Miniaturized Systems publication_identifier: isbn: - 978-3-8007-4919-5 publication_status: published publisher: VDE VERLAG GMBH related_material: record: - id: '9265' relation: other status: returned status: public title: Method of superposing a multiple driven magnetic field to minimize stray fields around the receiver for inductive wireless power transmission type: conference user_id: '38240' year: '2019' ... --- _id: '8872' abstract: - lang: eng text: We consider light scattering from a new type of model particle whose shape is represented in the form of a generalized ellipsoid having N foci, where N is greater than two. Such particles can be convex as well as concave. We use the geometrical optics approximation to study the light scattering from 3-foci particles. Non-zero elements of the scattering matrix are calculated for ensembles of randomly oriented independent transparent particles, m = n + i0. Several internal reflection orders are considered separately. It was found that the transmission-transmission (TT) and transmission-reflectance-transmission (TRT) components dominate in the formation of intensity of scattered light at large and small phase angles, respectively. We found a significant role of the total internal reflections of the TRT in the middle portion of the phase angle range. The main factors in the formation of positive linear polarization are the R and TRT component. The TT component is responsible for the formation of negative polarization branch at large phase angles. author: - first_name: Dmitriy full_name: Stankevich, Dmitriy last_name: Stankevich - first_name: Larissa full_name: Hradyska, Larissa last_name: Hradyska - first_name: Yuriy full_name: Shkuratov, Yuriy last_name: Shkuratov - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Gorden full_name: Videen, Gorden last_name: Videen - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Stankevich D, Hradyska L, Shkuratov Y, Grynko Y, Videen G, Förstner J. Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation. Journal of Quantitative Spectroscopy and Radiative Transfer. 2019;231:49. doi:10.1016/j.jqsrt.2019.04.016 apa: Stankevich, D., Hradyska, L., Shkuratov, Y., Grynko, Y., Videen, G., & Förstner, J. (2019). Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation. Journal of Quantitative Spectroscopy and Radiative Transfer, 231, 49. https://doi.org/10.1016/j.jqsrt.2019.04.016 bibtex: '@article{Stankevich_Hradyska_Shkuratov_Grynko_Videen_Förstner_2019, title={Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation}, volume={231}, DOI={10.1016/j.jqsrt.2019.04.016}, journal={Journal of Quantitative Spectroscopy and Radiative Transfer}, author={Stankevich, Dmitriy and Hradyska, Larissa and Shkuratov, Yuriy and Grynko, Yevgen and Videen, Gorden and Förstner, Jens}, year={2019}, pages={49} }' chicago: 'Stankevich, Dmitriy, Larissa Hradyska, Yuriy Shkuratov, Yevgen Grynko, Gorden Videen, and Jens Förstner. “Light Scattering by 3-Foci Convex and Concave Particles in the Geometrical Optics Approximation.” Journal of Quantitative Spectroscopy and Radiative Transfer 231 (2019): 49. https://doi.org/10.1016/j.jqsrt.2019.04.016.' ieee: D. Stankevich, L. Hradyska, Y. Shkuratov, Y. Grynko, G. Videen, and J. Förstner, “Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation,” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 231, p. 49, 2019. mla: Stankevich, Dmitriy, et al. “Light Scattering by 3-Foci Convex and Concave Particles in the Geometrical Optics Approximation.” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 231, 2019, p. 49, doi:10.1016/j.jqsrt.2019.04.016. short: D. Stankevich, L. Hradyska, Y. Shkuratov, Y. Grynko, G. Videen, J. Förstner, Journal of Quantitative Spectroscopy and Radiative Transfer 231 (2019) 49. date_created: 2019-04-11T07:38:54Z date_updated: 2022-01-06T07:04:04Z department: - _id: '61' doi: 10.1016/j.jqsrt.2019.04.016 intvolume: ' 231' keyword: - tet_topic_scattering language: - iso: eng page: '49' publication: Journal of Quantitative Spectroscopy and Radiative Transfer publication_identifier: issn: - 0022-4073 publication_status: published status: public title: Light scattering by 3-Foci convex and concave particles in the geometrical optics approximation type: journal_article user_id: '158' volume: 231 year: '2019' ... --- _id: '14990' abstract: - lang: eng text: We investigate optical microresonators consisting of either one or two coupled rectangular strips between upper and lower slab waveguides. The cavities are evanescently excited under oblique angles by thin-film guided, in-plane unguided waves supported by one of the slab waveguides. Beyond a specific incidence angle, losses are fully suppressed. The interaction between the guided mode of the cavity-strip and the incoming slab modes leads to resonant behavior for specific incidence angles and gaps. For a single cavity, at resonance, the input power is equally split among each of the four output ports, while for two cavities an add-drop filter can be realized that, at resonance, routes the incoming power completely to the forward drop waveguide via the cavity. For both applications, the strength of the interaction is controlled by the gaps between cavities and waveguides. author: - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Manuel B. full_name: Berkemeier, Manuel B. last_name: Berkemeier - first_name: Alexander full_name: Menzel, Alexander last_name: Menzel - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Ebers L, Hammer M, Berkemeier MB, Menzel A, Förstner J. Coupled microstrip-cavities under oblique incidence of semi-guided waves: a lossless integrated optical add-drop filter. OSA Continuum. 2019;2:3288. doi:10.1364/osac.2.003288' apa: 'Ebers, L., Hammer, M., Berkemeier, M. B., Menzel, A., & Förstner, J. (2019). Coupled microstrip-cavities under oblique incidence of semi-guided waves: a lossless integrated optical add-drop filter. OSA Continuum, 2, 3288. https://doi.org/10.1364/osac.2.003288' bibtex: '@article{Ebers_Hammer_Berkemeier_Menzel_Förstner_2019, title={Coupled microstrip-cavities under oblique incidence of semi-guided waves: a lossless integrated optical add-drop filter}, volume={2}, DOI={10.1364/osac.2.003288}, journal={OSA Continuum}, author={Ebers, Lena and Hammer, Manfred and Berkemeier, Manuel B. and Menzel, Alexander and Förstner, Jens}, year={2019}, pages={3288} }' chicago: 'Ebers, Lena, Manfred Hammer, Manuel B. Berkemeier, Alexander Menzel, and Jens Förstner. “Coupled Microstrip-Cavities under Oblique Incidence of Semi-Guided Waves: A Lossless Integrated Optical Add-Drop Filter.” OSA Continuum 2 (2019): 3288. https://doi.org/10.1364/osac.2.003288.' ieee: 'L. Ebers, M. Hammer, M. B. Berkemeier, A. Menzel, and J. Förstner, “Coupled microstrip-cavities under oblique incidence of semi-guided waves: a lossless integrated optical add-drop filter,” OSA Continuum, vol. 2, p. 3288, 2019.' mla: 'Ebers, Lena, et al. “Coupled Microstrip-Cavities under Oblique Incidence of Semi-Guided Waves: A Lossless Integrated Optical Add-Drop Filter.” OSA Continuum, vol. 2, 2019, p. 3288, doi:10.1364/osac.2.003288.' short: L. Ebers, M. Hammer, M.B. Berkemeier, A. Menzel, J. Förstner, OSA Continuum 2 (2019) 3288. date_created: 2019-11-15T07:21:20Z date_updated: 2022-01-06T06:52:13Z ddc: - '530' department: - _id: '61' - _id: '230' doi: 10.1364/osac.2.003288 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2019-11-15T15:33:26Z date_updated: 2019-11-15T15:33:26Z file_id: '15012' file_name: 2019-11-12 Ebers - Add Drop Filter - OSA continuum (official version).pdf file_size: 882779 relation: main_file file_date_updated: 2019-11-15T15:33:26Z has_accepted_license: '1' intvolume: ' 2' keyword: - tet_topic_waveguides language: - iso: eng main_file_link: - open_access: '1' url: https://www.osapublishing.org/osac/abstract.cfm?uri=osac-2-11-3288 oa: '1' page: '3288' project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C - _id: '75' name: TRR 142 - Subproject C5 publication: OSA Continuum publication_identifier: issn: - 2578-7519 publication_status: published status: public title: 'Coupled microstrip-cavities under oblique incidence of semi-guided waves: a lossless integrated optical add-drop filter' type: journal_article user_id: '158' volume: 2 year: '2019' ... --- _id: '12908' author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Hammer M, Ebers L, Förstner J. Oblique quasi-lossless excitation of a thin silicon slab waveguide: a guided-wave variant of an anti-reflection coating. Journal of the Optical Society of America B. 2019;36:2395. doi:10.1364/josab.36.002395' apa: 'Hammer, M., Ebers, L., & Förstner, J. (2019). Oblique quasi-lossless excitation of a thin silicon slab waveguide: a guided-wave variant of an anti-reflection coating. Journal of the Optical Society of America B, 36, 2395. https://doi.org/10.1364/josab.36.002395' bibtex: '@article{Hammer_Ebers_Förstner_2019, title={Oblique quasi-lossless excitation of a thin silicon slab waveguide: a guided-wave variant of an anti-reflection coating}, volume={36}, DOI={10.1364/josab.36.002395}, journal={Journal of the Optical Society of America B}, author={Hammer, Manfred and Ebers, Lena and Förstner, Jens}, year={2019}, pages={2395} }' chicago: 'Hammer, Manfred, Lena Ebers, and Jens Förstner. “Oblique Quasi-Lossless Excitation of a Thin Silicon Slab Waveguide: A Guided-Wave Variant of an Anti-Reflection Coating.” Journal of the Optical Society of America B 36 (2019): 2395. https://doi.org/10.1364/josab.36.002395.' ieee: 'M. Hammer, L. Ebers, and J. Förstner, “Oblique quasi-lossless excitation of a thin silicon slab waveguide: a guided-wave variant of an anti-reflection coating,” Journal of the Optical Society of America B, vol. 36, p. 2395, 2019.' mla: 'Hammer, Manfred, et al. “Oblique Quasi-Lossless Excitation of a Thin Silicon Slab Waveguide: A Guided-Wave Variant of an Anti-Reflection Coating.” Journal of the Optical Society of America B, vol. 36, 2019, p. 2395, doi:10.1364/josab.36.002395.' short: M. Hammer, L. Ebers, J. Förstner, Journal of the Optical Society of America B 36 (2019) 2395. date_created: 2019-08-09T07:07:45Z date_updated: 2022-01-06T06:51:24Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1364/josab.36.002395 file: - access_level: open_access content_type: application/pdf creator: fossie date_created: 2019-08-09T07:09:04Z date_updated: 2019-08-09T07:09:04Z file_id: '12909' file_name: 2019-07 Hammer - JOSA B - Oblique Quasi-Lossless Excitation of a Thin Silicon Slab Waveguide (preprint).pdf file_size: 728533 relation: main_file file_date_updated: 2019-08-09T07:09:04Z has_accepted_license: '1' intvolume: ' 36' keyword: - tet_topic_waveguides language: - iso: eng oa: '1' page: '2395' project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C - _id: '75' name: TRR 142 - Subproject C5 publication: Journal of the Optical Society of America B publication_identifier: issn: - 0740-3224 - 1520-8540 publication_status: published status: public title: 'Oblique quasi-lossless excitation of a thin silicon slab waveguide: a guided-wave variant of an anti-reflection coating' type: journal_article user_id: '158' volume: 36 year: '2019' ... --- _id: '1588' abstract: - lang: eng text: The exploration of FPGAs as accelerators for scientific simulations has so far mostly been focused on small kernels of methods working on regular data structures, for example in the form of stencil computations for finite difference methods. In computational sciences, often more advanced methods are employed that promise better stability, convergence, locality and scaling. Unstructured meshes are shown to be more effective and more accurate, compared to regular grids, in representing computation domains of various shapes. Using unstructured meshes, the discontinuous Galerkin method preserves the ability to perform explicit local update operations for simulations in the time domain. In this work, we investigate FPGAs as target platform for an implementation of the nodal discontinuous Galerkin method to find time-domain solutions of Maxwell's equations in an unstructured mesh. When maximizing data reuse and fitting constant coefficients into suitably partitioned on-chip memory, high computational intensity allows us to implement and feed wide data paths with hundreds of floating point operators. By decoupling off-chip memory accesses from the computations, high memory bandwidth can be sustained, even for the irregular access pattern required by parts of the application. Using the Intel/Altera OpenCL SDK for FPGAs, we present different implementation variants for different polynomial orders of the method. In different phases of the algorithm, either computational or bandwidth limits of the Arria 10 platform are almost reached, thus outperforming a highly multithreaded CPU implementation by around 2x. author: - first_name: Tobias full_name: Kenter, Tobias id: '3145' last_name: Kenter - first_name: Gopinath full_name: Mahale, Gopinath last_name: Mahale - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Christian full_name: Schmitt, Christian last_name: Schmitt - first_name: Ayesha full_name: Afzal, Ayesha last_name: Afzal - first_name: Frank full_name: Hannig, Frank last_name: Hannig - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Christian full_name: Plessl, Christian id: '16153' last_name: Plessl orcid: 0000-0001-5728-9982 citation: ama: 'Kenter T, Mahale G, Alhaddad S, et al. OpenCL-based FPGA Design to Accelerate the Nodal Discontinuous Galerkin Method for Unstructured Meshes. In: Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM). IEEE; 2018. doi:10.1109/FCCM.2018.00037' apa: Kenter, T., Mahale, G., Alhaddad, S., Grynko, Y., Schmitt, C., Afzal, A., Hannig, F., Förstner, J., & Plessl, C. (2018). OpenCL-based FPGA Design to Accelerate the Nodal Discontinuous Galerkin Method for Unstructured Meshes. Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM). Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM). https://doi.org/10.1109/FCCM.2018.00037 bibtex: '@inproceedings{Kenter_Mahale_Alhaddad_Grynko_Schmitt_Afzal_Hannig_Förstner_Plessl_2018, title={OpenCL-based FPGA Design to Accelerate the Nodal Discontinuous Galerkin Method for Unstructured Meshes}, DOI={10.1109/FCCM.2018.00037}, booktitle={Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM)}, publisher={IEEE}, author={Kenter, Tobias and Mahale, Gopinath and Alhaddad, Samer and Grynko, Yevgen and Schmitt, Christian and Afzal, Ayesha and Hannig, Frank and Förstner, Jens and Plessl, Christian}, year={2018} }' chicago: Kenter, Tobias, Gopinath Mahale, Samer Alhaddad, Yevgen Grynko, Christian Schmitt, Ayesha Afzal, Frank Hannig, Jens Förstner, and Christian Plessl. “OpenCL-Based FPGA Design to Accelerate the Nodal Discontinuous Galerkin Method for Unstructured Meshes.” In Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM). IEEE, 2018. https://doi.org/10.1109/FCCM.2018.00037. ieee: 'T. Kenter et al., “OpenCL-based FPGA Design to Accelerate the Nodal Discontinuous Galerkin Method for Unstructured Meshes,” presented at the Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM), 2018, doi: 10.1109/FCCM.2018.00037.' mla: Kenter, Tobias, et al. “OpenCL-Based FPGA Design to Accelerate the Nodal Discontinuous Galerkin Method for Unstructured Meshes.” Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM), IEEE, 2018, doi:10.1109/FCCM.2018.00037. short: 'T. Kenter, G. Mahale, S. Alhaddad, Y. Grynko, C. Schmitt, A. Afzal, F. Hannig, J. Förstner, C. Plessl, in: Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM), IEEE, 2018.' conference: name: Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM) date_created: 2018-03-22T10:48:01Z date_updated: 2023-09-26T11:47:52Z ddc: - '000' department: - _id: '27' - _id: '518' - _id: '61' doi: 10.1109/FCCM.2018.00037 file: - access_level: closed content_type: application/pdf creator: ups date_created: 2018-11-02T14:45:05Z date_updated: 2018-11-02T14:45:05Z file_id: '5282' file_name: 08457652.pdf file_size: 269130 relation: main_file success: 1 file_date_updated: 2018-11-02T14:45:05Z has_accepted_license: '1' keyword: - tet_topic_hpc language: - iso: eng project: - _id: '33' grant_number: 01|H16005A name: HighPerMeshes - _id: '1' grant_number: '160364472' name: SFB 901 - _id: '4' name: SFB 901 - Project Area C - _id: '14' grant_number: '160364472' name: SFB 901 - Subproject C2 publication: Proc. Int. Symp. on Field-Programmable Custom Computing Machines (FCCM) publisher: IEEE quality_controlled: '1' status: public title: OpenCL-based FPGA Design to Accelerate the Nodal Discontinuous Galerkin Method for Unstructured Meshes type: conference user_id: '15278' year: '2018' ... --- _id: '3427' abstract: - lang: eng text: "We report on the coherent phase manipulation of quantum dot excitons by electric means. For our\r\nexperiments, we use a low capacitance single quantum dot photodiode which is electrically\r\ncontrolled by a custom designed SiGe:C BiCMOS chip. The phase manipulation is performed and\r\nquantified in a Ramsey experiment, where ultrafast transient detuning of the exciton energy is\r\nperformed synchronous to double pulse p/2 ps laser excitation. We are able to demonstrate\r\nelectrically controlled phase manipulations with magnitudes up to 3p within 100 ps which is below\r\nthe dephasing time of the quantum dot exciton." article_type: original author: - first_name: Alex full_name: Widhalm, Alex last_name: Widhalm - first_name: Amlan full_name: Mukherjee, Amlan last_name: Mukherjee - first_name: Sebastian full_name: Krehs, Sebastian last_name: Krehs - first_name: Nandlal full_name: Sharma, Nandlal last_name: Sharma - first_name: Peter full_name: Kölling, Peter last_name: Kölling - first_name: Andreas full_name: Thiede, Andreas id: '538' last_name: Thiede - first_name: Dirk full_name: Reuter, Dirk id: '37763' last_name: Reuter - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 - first_name: Artur full_name: Zrenner, Artur id: '606' last_name: Zrenner orcid: 0000-0002-5190-0944 citation: ama: Widhalm A, Mukherjee A, Krehs S, et al. Ultrafast electric phase control of a single exciton qubit. Applied Physics Letters. 2018;112(11):111105. doi:10.1063/1.5020364 apa: Widhalm, A., Mukherjee, A., Krehs, S., Sharma, N., Kölling, P., Thiede, A., Reuter, D., Förstner, J., & Zrenner, A. (2018). Ultrafast electric phase control of a single exciton qubit. Applied Physics Letters, 112(11), 111105. https://doi.org/10.1063/1.5020364 bibtex: '@article{Widhalm_Mukherjee_Krehs_Sharma_Kölling_Thiede_Reuter_Förstner_Zrenner_2018, title={Ultrafast electric phase control of a single exciton qubit}, volume={112}, DOI={10.1063/1.5020364}, number={11}, journal={Applied Physics Letters}, author={Widhalm, Alex and Mukherjee, Amlan and Krehs, Sebastian and Sharma, Nandlal and Kölling, Peter and Thiede, Andreas and Reuter, Dirk and Förstner, Jens and Zrenner, Artur}, year={2018}, pages={111105} }' chicago: 'Widhalm, Alex, Amlan Mukherjee, Sebastian Krehs, Nandlal Sharma, Peter Kölling, Andreas Thiede, Dirk Reuter, Jens Förstner, and Artur Zrenner. “Ultrafast Electric Phase Control of a Single Exciton Qubit.” Applied Physics Letters 112, no. 11 (2018): 111105. https://doi.org/10.1063/1.5020364.' ieee: 'A. Widhalm et al., “Ultrafast electric phase control of a single exciton qubit,” Applied Physics Letters, vol. 112, no. 11, p. 111105, 2018, doi: 10.1063/1.5020364.' mla: Widhalm, Alex, et al. “Ultrafast Electric Phase Control of a Single Exciton Qubit.” Applied Physics Letters, vol. 112, no. 11, 2018, p. 111105, doi:10.1063/1.5020364. short: A. Widhalm, A. Mukherjee, S. Krehs, N. Sharma, P. Kölling, A. Thiede, D. Reuter, J. Förstner, A. Zrenner, Applied Physics Letters 112 (2018) 111105. date_created: 2018-07-05T09:47:26Z date_updated: 2023-01-24T11:00:08Z ddc: - '530' department: - _id: '15' - _id: '230' - _id: '61' - _id: '51' doi: 10.1063/1.5020364 file: - access_level: request content_type: application/pdf creator: fossie date_created: 2018-08-16T07:42:38Z date_updated: 2022-01-06T06:59:16Z embargo: 2019-03-01 embargo_to: open_access file_id: '3914' file_name: 2018-03 Widhalm APL Ultrafast electric phase control of a single exciton qubit.pdf file_size: 923692 relation: main_file file_date_updated: 2022-01-06T06:59:16Z has_accepted_license: '1' intvolume: ' 112' issue: '11' keyword: - tet_topic_qd language: - iso: eng page: '111105' project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C - _id: '74' name: TRR 142 - Subproject C4 publication: Applied Physics Letters publication_identifier: issn: - 0003-6951 publication_status: published status: public title: Ultrafast electric phase control of a single exciton qubit type: journal_article user_id: '158' volume: 112 year: '2018' ... --- _id: '5469' abstract: - lang: ger text: In diesem Beitrag werden simulatorische und messtechnische EMV-Untersuchungen von Gleichspannungswandlern vorgestellt. Der Fokus liegt auf leitungsgeführten Störspannungen, ihre Abhängigkeit vom Schaltungslayout und ihre Unterdrückung durch Filterung. Der Simulationsprozess besteht aus kombinierten Feld- und Netzwerksimulationen. Zur Bewertung der Simulationsresultate werden zwei Prototypen gezeigt, die gute und schlechte EMV-Eigenschaften aufweisen. Bei der Beurteilung der Resultate wird insbesondere Wert auf die Untersuchung gelegt, inwieweit einfache Schaltungssimulationen ausreichen, um leitungsgeführte Störspannungen korrekt vorherzusagen und wann aufwändigere Feldsimulationen notwendig sind. author: - first_name: Tim full_name: Baumgarten, Tim last_name: Baumgarten - first_name: Peter full_name: Scholz, Peter last_name: Scholz - first_name: Denis full_name: Sievers, Denis last_name: Sievers - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Baumgarten T, Scholz P, Sievers D, Förstner J. Simulation leitungsgeführter Störspannungen von DC-DC-Wandlern. In: Garbe H, ed. Elektromagnetische Verträglichkeit - Internationale Fachmesse Und Kongress 2018. ; 2018:47.' apa: Baumgarten, T., Scholz, P., Sievers, D., & Förstner, J. (2018). Simulation leitungsgeführter Störspannungen von DC-DC-Wandlern. In H. Garbe (Ed.), Elektromagnetische Verträglichkeit - Internationale Fachmesse und Kongress 2018 (p. 47). Düsseldorf. bibtex: '@inproceedings{Baumgarten_Scholz_Sievers_Förstner_2018, title={Simulation leitungsgeführter Störspannungen von DC-DC-Wandlern}, booktitle={Elektromagnetische Verträglichkeit - Internationale Fachmesse und Kongress 2018}, author={Baumgarten, Tim and Scholz, Peter and Sievers, Denis and Förstner, Jens}, editor={Garbe, HeynoEditor}, year={2018}, pages={47} }' chicago: Baumgarten, Tim, Peter Scholz, Denis Sievers, and Jens Förstner. “Simulation Leitungsgeführter Störspannungen von DC-DC-Wandlern.” In Elektromagnetische Verträglichkeit - Internationale Fachmesse Und Kongress 2018, edited by Heyno Garbe, 47, 2018. ieee: T. Baumgarten, P. Scholz, D. Sievers, and J. Förstner, “Simulation leitungsgeführter Störspannungen von DC-DC-Wandlern,” in Elektromagnetische Verträglichkeit - Internationale Fachmesse und Kongress 2018, Düsseldorf, 2018, p. 47. mla: Baumgarten, Tim, et al. “Simulation Leitungsgeführter Störspannungen von DC-DC-Wandlern.” Elektromagnetische Verträglichkeit - Internationale Fachmesse Und Kongress 2018, edited by Heyno Garbe, 2018, p. 47. short: 'T. Baumgarten, P. Scholz, D. Sievers, J. Förstner, in: H. Garbe (Ed.), Elektromagnetische Verträglichkeit - Internationale Fachmesse Und Kongress 2018, 2018, p. 47.' conference: location: Düsseldorf name: emv Internationale Fachmesse und Kongress 2018 date_created: 2018-11-08T23:44:10Z date_updated: 2022-01-06T07:01:55Z department: - _id: '61' editor: - first_name: Heyno full_name: Garbe, Heyno last_name: Garbe language: - iso: eng page: '47' publication: Elektromagnetische Verträglichkeit - Internationale Fachmesse und Kongress 2018 publication_identifier: isbn: - 978-3-95735-077-0 status: public title: Simulation leitungsgeführter Störspannungen von DC-DC-Wandlern type: conference user_id: '158' year: '2018' ... --- _id: '4831' abstract: - lang: eng text: Polarization of light is essential for some living organisms and many optical applications. Here, an orientation dependent polarization conversion effect is reported for light reflected from diamond‐structure‐based photonic crystals (D‐structure) inside the scales of a beetle, the weevil Entimus imperialis. When linearly polarized light propagates along its 〈100〉 directions, the D‐structure behaves analogous to a half‐wave plate in reflection but based on a different mechanism. The D‐structure rotates the polarization direction of linearly polarized light, and reflects circularly polarized light of both handednesses without changing it. This polarization effect is different from circular dichroism occurring in chiral biological photonic structures discovered before. The structural origin of this effect is symmetry breaking inside D‐structure's unit cell. This finding demonstrates that natural photonic structures can exploit multiple functionalities inherent to the design principles of their structural organization. Aiming at transferring the inherent polarization effect of the biological D‐structure to technically realizable materials, three simplified biomimetic structural models are derived and it is theoretically demonstrated that they retain the effect. Out of these structures, functioning woodpile structure prototypes are fabricated. author: - first_name: Xia full_name: Wu, Xia last_name: Wu - first_name: Fernando L. full_name: Rodríguez-Gallegos, Fernando L. last_name: Rodríguez-Gallegos - first_name: Marie-Christin full_name: Heep, Marie-Christin last_name: Heep - first_name: Bertram full_name: Schwind, Bertram last_name: Schwind - first_name: Guixin full_name: Li, Guixin last_name: Li - first_name: Helge-Otto full_name: Fabritius, Helge-Otto last_name: Fabritius - first_name: Georg full_name: von Freymann, Georg last_name: von Freymann - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: Wu X, Rodríguez-Gallegos FL, Heep M-C, et al. Polarization Conversion Effect in Biological and Synthetic Photonic Diamond Structures. Advanced Optical Materials. 2018;6(24):1800635. doi:10.1002/adom.201800635 apa: Wu, X., Rodríguez-Gallegos, F. L., Heep, M.-C., Schwind, B., Li, G., Fabritius, H.-O., … Förstner, J. (2018). Polarization Conversion Effect in Biological and Synthetic Photonic Diamond Structures. Advanced Optical Materials, 6(24), 1800635. https://doi.org/10.1002/adom.201800635 bibtex: '@article{Wu_Rodríguez-Gallegos_Heep_Schwind_Li_Fabritius_von Freymann_Förstner_2018, title={Polarization Conversion Effect in Biological and Synthetic Photonic Diamond Structures}, volume={6}, DOI={10.1002/adom.201800635}, number={24}, journal={Advanced Optical Materials}, publisher={Wiley}, author={Wu, Xia and Rodríguez-Gallegos, Fernando L. and Heep, Marie-Christin and Schwind, Bertram and Li, Guixin and Fabritius, Helge-Otto and von Freymann, Georg and Förstner, Jens}, year={2018}, pages={1800635} }' chicago: 'Wu, Xia, Fernando L. Rodríguez-Gallegos, Marie-Christin Heep, Bertram Schwind, Guixin Li, Helge-Otto Fabritius, Georg von Freymann, and Jens Förstner. “Polarization Conversion Effect in Biological and Synthetic Photonic Diamond Structures.” Advanced Optical Materials 6, no. 24 (2018): 1800635. https://doi.org/10.1002/adom.201800635.' ieee: X. Wu et al., “Polarization Conversion Effect in Biological and Synthetic Photonic Diamond Structures,” Advanced Optical Materials, vol. 6, no. 24, p. 1800635, 2018. mla: Wu, Xia, et al. “Polarization Conversion Effect in Biological and Synthetic Photonic Diamond Structures.” Advanced Optical Materials, vol. 6, no. 24, Wiley, 2018, p. 1800635, doi:10.1002/adom.201800635. short: X. Wu, F.L. Rodríguez-Gallegos, M.-C. Heep, B. Schwind, G. Li, H.-O. Fabritius, G. von Freymann, J. Förstner, Advanced Optical Materials 6 (2018) 1800635. date_created: 2018-10-24T11:50:29Z date_updated: 2022-01-06T07:01:26Z ddc: - '530' department: - _id: '61' doi: 10.1002/adom.201800635 file: - access_level: closed content_type: application/pdf creator: fossie date_created: 2018-10-24T11:55:33Z date_updated: 2018-10-24T11:55:33Z file_id: '4832' file_name: 2018-10 Xia Wu - Advanced Optical Materials - Polarization Conversion Effect in Biological and Synthetic Photonic Diamond Structures.pdf file_size: 4191754 relation: main_file success: 1 file_date_updated: 2018-10-24T11:55:33Z has_accepted_license: '1' intvolume: ' 6' issue: '24' keyword: - tet_topic_phc - tet_topic_bio language: - iso: eng page: '1800635' project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C - _id: '74' name: TRR 142 - Subproject C4 publication: Advanced Optical Materials publication_identifier: issn: - 2195-1071 publication_status: published publisher: Wiley status: public title: Polarization Conversion Effect in Biological and Synthetic Photonic Diamond Structures type: journal_article user_id: '158' volume: 6 year: '2018' ... --- _id: '4581' author: - first_name: Yevgen full_name: Grynko, Yevgen id: '26059' last_name: Grynko - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Grynko Y, Förstner J. Application of the Discontinuous Galerkin Time Domain Method in Nonlinear Nanoplasmonics. In: 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE; 2018. doi:10.1109/mmet.2018.8460261' apa: Grynko, Y., & Förstner, J. (2018). Application of the Discontinuous Galerkin Time Domain Method in Nonlinear Nanoplasmonics. In 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE. https://doi.org/10.1109/mmet.2018.8460261 bibtex: '@inproceedings{Grynko_Förstner_2018, title={Application of the Discontinuous Galerkin Time Domain Method in Nonlinear Nanoplasmonics}, DOI={10.1109/mmet.2018.8460261}, booktitle={2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)}, publisher={IEEE}, author={Grynko, Yevgen and Förstner, Jens}, year={2018} }' chicago: Grynko, Yevgen, and Jens Förstner. “Application of the Discontinuous Galerkin Time Domain Method in Nonlinear Nanoplasmonics.” In 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE, 2018. https://doi.org/10.1109/mmet.2018.8460261. ieee: Y. Grynko and J. Förstner, “Application of the Discontinuous Galerkin Time Domain Method in Nonlinear Nanoplasmonics,” in 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET), 2018. mla: Grynko, Yevgen, and Jens Förstner. “Application of the Discontinuous Galerkin Time Domain Method in Nonlinear Nanoplasmonics.” 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET), IEEE, 2018, doi:10.1109/mmet.2018.8460261. short: 'Y. Grynko, J. Förstner, in: 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET), IEEE, 2018.' date_created: 2018-10-04T22:21:39Z date_updated: 2022-01-06T07:01:14Z ddc: - '530' department: - _id: '61' doi: 10.1109/mmet.2018.8460261 file: - access_level: closed content_type: application/pdf creator: fossie date_created: 2018-10-04T22:25:59Z date_updated: 2018-10-04T22:25:59Z file_id: '4582' file_name: 2018-09 Grynko - MMET (preprint).pdf file_size: 1131678 relation: main_file success: 1 file_date_updated: 2018-10-04T22:25:59Z has_accepted_license: '1' keyword: - tet_topic_numerics - tet_topic_shg language: - iso: eng project: - _id: '52' name: Computing Resources Provided by the Paderborn Center for Parallel Computing publication: 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET) publication_identifier: isbn: - '9781538654385' publication_status: published publisher: IEEE status: public title: Application of the Discontinuous Galerkin Time Domain Method in Nonlinear Nanoplasmonics type: conference user_id: '158' year: '2018' ... --- _id: '4579' abstract: - lang: eng text: Semi-guided waves confined in dielectric slab waveguides are being considered for oblique angles of propagation. If the waves encounter a linear discontinuity of (mostly) arbitrary shape and extension, a variant of Snell's law applies, separately for each pair of incoming and outgoing modes. Depending on the effective indices involved, and on the angle of incidence, power transfer to specific outgoing waves can be allowed or forbidden. In particular, critical angles of incidence can be identified, beyond which any power transfer to non-guided waves is forbidden, i.e. all radiative losses are suppressed. In that case the input power is carried away from the discontinuity exclusively by reflected semi-guided waves in the input slab, or by semi-guided waves that are transmitted into other outgoing slab waveguides. Vectorial equations on a 2-D cross sectional domain apply. These are formally identical to the equations that govern the eigenmodes of 3-D channel waveguides. Here, however, these need to be solved not as an eigenvalue problem, but as an inhomogeneous problem with a right-hand-side that is given by the incoming semi-guided wave, and subject to transparent boundary conditions. The equations resemble a standard 2-D Helmholtz problem, with an effective permittivity in place of the actual relative permittivity. Depending on the properties of the incoming wave, including the angle of incidence, this effective permittivity can become locally negative, causing the suppression of propagating outgoing waves. A series of high-contrast example configurations are discussed, where these effects lead to - in some respects - quite surprising transmission characteristics. author: - first_name: Manfred full_name: Hammer, Manfred id: '48077' last_name: Hammer orcid: 0000-0002-6331-9348 - first_name: Lena full_name: Ebers, Lena id: '40428' last_name: Ebers - first_name: Andre full_name: Hildebrandt, Andre last_name: Hildebrandt - first_name: Samer full_name: Alhaddad, Samer id: '42456' last_name: Alhaddad - first_name: Jens full_name: Förstner, Jens id: '158' last_name: Förstner orcid: 0000-0001-7059-9862 citation: ama: 'Hammer M, Ebers L, Hildebrandt A, Alhaddad S, Förstner J. Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity. In: 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE; 2018. doi:10.1109/mmet.2018.8460455' apa: 'Hammer, M., Ebers, L., Hildebrandt, A., Alhaddad, S., & Förstner, J. (2018). Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity. In 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE. https://doi.org/10.1109/mmet.2018.8460455' bibtex: '@inproceedings{Hammer_Ebers_Hildebrandt_Alhaddad_Förstner_2018, title={Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity}, DOI={10.1109/mmet.2018.8460455}, booktitle={2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)}, publisher={IEEE}, author={Hammer, Manfred and Ebers, Lena and Hildebrandt, Andre and Alhaddad, Samer and Förstner, Jens}, year={2018} }' chicago: 'Hammer, Manfred, Lena Ebers, Andre Hildebrandt, Samer Alhaddad, and Jens Förstner. “Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity.” In 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET). IEEE, 2018. https://doi.org/10.1109/mmet.2018.8460455.' ieee: 'M. Hammer, L. Ebers, A. Hildebrandt, S. Alhaddad, and J. Förstner, “Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity,” in 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET), 2018.' mla: 'Hammer, Manfred, et al. “Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity.” 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET), IEEE, 2018, doi:10.1109/mmet.2018.8460455.' short: 'M. Hammer, L. Ebers, A. Hildebrandt, S. Alhaddad, J. Förstner, in: 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET), IEEE, 2018.' date_created: 2018-10-02T17:11:59Z date_updated: 2022-01-06T07:01:13Z ddc: - '530' department: - _id: '61' - _id: '230' - _id: '429' doi: 10.1109/mmet.2018.8460455 file: - access_level: closed content_type: application/pdf creator: fossie date_created: 2018-10-02T17:13:55Z date_updated: 2018-10-02T17:13:55Z file_id: '4580' file_name: 2018-09 Hammer - MMET (final draft).pdf file_size: 242956 relation: main_file success: 1 file_date_updated: 2018-10-02T17:13:55Z has_accepted_license: '1' keyword: - tet_topic_waveguides project: - _id: '53' name: TRR 142 - _id: '56' name: TRR 142 - Project Area C - _id: '75' name: TRR 142 - Subproject C5 publication: 2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET) publication_identifier: isbn: - '9781538654385' publication_status: published publisher: IEEE status: public title: 'Oblique Semi-Guided Waves: 2-D Integrated Photonics with Negative Effective Permittivity' type: conference user_id: '158' year: '2018' ...