[{"language":[{"iso":"eng"}],"date_updated":"2024-03-21T10:40:51Z","oa":"1","doi":"10.1088/1402-4896/ad3172","department":[{"_id":"61"},{"_id":"230"}],"project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"publication_identifier":{"issn":["0031-8949","1402-4896"]},"publication_status":"published","title":"From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops","page":"045952","citation":{"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} }","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.","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.","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","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.","short":"V. Myroshnychenko, P.M. Mulavarickal Jose, H. Farheen, S. Ejaz, C. Brosseau, J. Förstner, Physica Scripta 99 (2024) 045952."},"year":"2024","type":"journal_article","intvolume":" 99","_id":"52700","issue":"4","file":[{"access_level":"open_access","date_created":"2024-03-21T10:39:32Z","file_name":"2024-03 Myroshnychenko - Physica Scripta - From Swiss-cheese to discrete ferroelectric.pdf","content_type":"application/pdf","date_updated":"2024-03-21T10:39:32Z","relation":"main_file","file_size":5386508,"creator":"fossie","file_id":"52701"}],"keyword":["tet_topic_ferro"],"publication":"Physica Scripta","file_date_updated":"2024-03-21T10:39:32Z","author":[{"full_name":"Myroshnychenko, Viktor","first_name":"Viktor","id":"46371","last_name":"Myroshnychenko"},{"last_name":"Mulavarickal Jose","full_name":"Mulavarickal Jose, Pious Mathews","first_name":"Pious Mathews"},{"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","orcid":"0000-0001-7059-9862","last_name":"Förstner","id":"158"}],"publisher":"IOP Publishing","date_created":"2024-03-21T10:34:48Z","status":"public","has_accepted_license":"1","volume":99,"abstract":[{"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.","lang":"eng"}],"user_id":"158","ddc":["530"]},{"related_material":{"record":[{"relation":"earlier_version","id":"43246","status":"public"}]},"title":"On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs","project":[{"name":"TRR 142 - C09: TRR 142 - Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen (C09*)","grant_number":"231447078","_id":"173"},{"_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)","grant_number":"231447078"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"publication_identifier":{"issn":["2511-9044","2511-9044"]},"publication_status":"published","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"oa":"1","doi":"10.1002/qute.202300142","date_updated":"2023-12-21T10:41:17Z","language":[{"iso":"eng"}],"user_id":"158","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."}],"date_created":"2023-11-03T10:07:38Z","status":"public","keyword":["tet_topic_qd"],"publication":"Advanced Quantum Technologies","publisher":"Wiley","author":[{"last_name":"Bauch","first_name":"David","full_name":"Bauch, David"},{"first_name":"Dustin","full_name":"Siebert, Dustin","last_name":"Siebert"},{"id":"85353","last_name":"Jöns","full_name":"Jöns, Klaus","first_name":"Klaus"},{"full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","first_name":"Jens","id":"158","last_name":"Förstner"},{"id":"27271","last_name":"Schumacher","orcid":"0000-0003-4042-4951","full_name":"Schumacher, Stefan","first_name":"Stefan"}],"_id":"48599","year":"2023","type":"journal_article","citation":{"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.","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.","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","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.","short":"D. Bauch, D. Siebert, K. Jöns, J. Förstner, S. Schumacher, Advanced Quantum Technologies (2023)."},"main_file_link":[{"url":"https://onlinelibrary.wiley.com/doi/10.1002/qute.202300142","open_access":"1"}]},{"title":"On-demand indistinguishable and entangled photons at telecom frequencies using tailored cavity designs","user_id":"16199","related_material":{"record":[{"relation":"later_version","id":"48599","status":"public"}]},"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 $1550\\,\\mathrm{nm}$."}],"status":"public","project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"_id":"173","grant_number":"231447078","name":"TRR 142 - C09: TRR 142 - Subproject C09"},{"grant_number":"231447078","name":"TRR 142 - B06: TRR 142 - Subproject B06","_id":"167"},{"_id":"53","grant_number":"231447078","name":"TRR 142: TRR 142"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"TRR 142 - C: TRR 142 - Project Area C","_id":"56"}],"date_created":"2023-03-31T13:22:05Z","author":[{"full_name":"Bauch, David","first_name":"David","last_name":"Bauch"},{"last_name":"Siebert","first_name":"Dustin","full_name":"Siebert, Dustin"},{"first_name":"Klaus","full_name":"Jöns, Klaus","last_name":"Jöns","id":"85353"},{"first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","last_name":"Förstner","id":"158"},{"full_name":"Schumacher, Stefan","orcid":"0000-0003-4042-4951","first_name":"Stefan","id":"27271","last_name":"Schumacher"}],"keyword":["tet_topic_phc","tet_topic_qd"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"},{"_id":"15"},{"_id":"35"},{"_id":"170"},{"_id":"297"}],"oa":"1","date_updated":"2023-12-21T10:41:17Z","_id":"43246","year":"2023","type":"preprint","citation":{"short":"D. Bauch, D. Siebert, K. Jöns, J. Förstner, S. Schumacher, (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.","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.","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} }","mla":"Bauch, David, et al. On-Demand Indistinguishable and Entangled Photons at Telecom Frequencies Using Tailored Cavity Designs. 2023."},"language":[{"iso":"eng"}],"main_file_link":[{"url":"https://arxiv.org/pdf/2303.13871.pdf","open_access":"1"}]},{"doi":"10.1109/cama57522.2023.10352780","date_updated":"2023-12-21T09:51:11Z","language":[{"iso":"eng"}],"title":"Characterization of Various Environmental Influences on the Inductive Localization","place":"Genoa, Italy ","publication_status":"published","publication_identifier":{"eisbn":["979-8-3503-2304-7"]},"department":[{"_id":"59"},{"_id":"61"},{"_id":"485"}],"_id":"49890","conference":{"start_date":"2023-11-15","name":"2023 IEEE Conference on Antenna Measurements and Applications (CAMA)","location":"Genoa, Italy ","end_date":"2023-11-17"},"type":"conference","citation":{"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.","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.","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.","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} }","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","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."},"year":"2023","main_file_link":[{"url":"https://ieeexplore.ieee.org/document/10352780"}],"user_id":"158","abstract":[{"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.","lang":"eng"}],"status":"public","date_created":"2023-12-20T08:36:58Z","publisher":"IEEE","author":[{"last_name":"Lange","id":"38240","first_name":"Sven","full_name":"Lange, Sven"},{"id":"20179","last_name":"Hilleringmann","full_name":"Hilleringmann, Ulrich","first_name":"Ulrich"},{"first_name":"Christian","full_name":"Hedayat, Christian","last_name":"Hedayat"},{"full_name":"Kuhn, Harald","first_name":"Harald","last_name":"Kuhn"},{"id":"158","last_name":"Förstner","full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","first_name":"Jens"}],"publication":"2023 IEEE Conference on Antenna Measurements and Applications (CAMA)","keyword":["Planar coils","inductive locating","magnetic fields","environmental influences","eddy currents","tet_topic_hf"]},{"related_material":{"link":[{"relation":"research_data","url":"https://doi.org/10.5281/zenodo.10044122"}]},"title":"Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays","project":[{"_id":"266","name":"PhoQC: PhoQC: Photonisches Quantencomputing","grant_number":"PROFILNRW-2020-067"},{"_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)","grant_number":"231447078"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"publication_status":"published","publication_identifier":{"issn":["1569-4410"]},"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"58"}],"oa":"1","doi":"10.1016/j.photonics.2023.101207","date_updated":"2023-12-21T09:48:39Z","language":[{"iso":"eng"}],"user_id":"158","ddc":["530"],"abstract":[{"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.","lang":"eng"}],"date_created":"2023-12-21T09:30:03Z","status":"public","has_accepted_license":"1","volume":58,"file":[{"relation":"main_file","content_type":"application/pdf","date_updated":"2023-12-21T09:34:17Z","file_id":"50013","creator":"fossie","file_size":3339442,"access_level":"open_access","file_name":"2ß23-12 Farheen - PNFA - Optimized, highly efficient silicon antennas for optical phased arrays.pdf","date_created":"2023-12-21T09:34:17Z"}],"publication":"Photonics and Nanostructures - Fundamentals and Applications","file_date_updated":"2023-12-21T09:34:17Z","keyword":["tet_topic_opticalantenna"],"publisher":"Elsevier BV","author":[{"first_name":"Henna","full_name":"Farheen, Henna","last_name":"Farheen"},{"first_name":"Andreas","full_name":"Strauch, Andreas","last_name":"Strauch"},{"last_name":"Scheytt","id":"37144","first_name":"J. Christoph","full_name":"Scheytt, J. Christoph","orcid":"0000-0002-5950-6618 "},{"full_name":"Myroshnychenko, Viktor","first_name":"Viktor","id":"46371","last_name":"Myroshnychenko"},{"id":"158","last_name":"Förstner","full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","first_name":"Jens"}],"intvolume":" 58","_id":"50012","page":"101207","year":"2023","type":"journal_article","citation":{"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.","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","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.","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} }","short":"H. Farheen, A. Strauch, J.C. Scheytt, V. Myroshnychenko, J. Förstner, Photonics and Nanostructures - Fundamentals and Applications 58 (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."}}]