[{"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"},{"_id":"15"},{"_id":"35"},{"_id":"170"},{"_id":"297"}],"oa":"1","keyword":["tet_topic_phc","tet_topic_qd"],"type":"preprint","date_created":"2023-03-31T13:22:05Z","project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"},{"name":"TRR 142 - C09: TRR 142 - Subproject C09","_id":"173","grant_number":"231447078"},{"name":"TRR 142 - B06: TRR 142 - Subproject B06","_id":"167","grant_number":"231447078"},{"name":"TRR 142: TRR 142","_id":"53","grant_number":"231447078"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"name":"TRR 142 - C: TRR 142 - Project Area C","_id":"56"}],"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 $1550\\,\\mathrm{nm}$."}],"related_material":{"record":[{"status":"public","relation":"later_version","id":"48599"}]},"citation":{"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.","apa":"Bauch, D., Siebert, D., Jöns, K., Förstner, J., &#38; Schumacher, S. (2023). <i>On-demand indistinguishable and entangled photons at telecom frequencies using tailored cavity designs</i>.","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.","short":"D. Bauch, D. Siebert, K. Jöns, J. Förstner, S. Schumacher, (2023).","mla":"Bauch, David, et al. <i>On-Demand Indistinguishable and Entangled Photons at Telecom Frequencies Using Tailored Cavity Designs</i>. 2023.","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} }","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."},"user_id":"16199","language":[{"iso":"eng"}],"_id":"43246","main_file_link":[{"open_access":"1","url":"https://arxiv.org/pdf/2303.13871.pdf"}],"date_updated":"2023-12-21T10:41:17Z","author":[{"full_name":"Bauch, David","first_name":"David","last_name":"Bauch"},{"first_name":"Dustin","last_name":"Siebert","full_name":"Siebert, Dustin"},{"id":"85353","first_name":"Klaus","last_name":"Jöns","full_name":"Jöns, Klaus"},{"id":"158","orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","full_name":"Förstner, Jens"},{"id":"27271","last_name":"Schumacher","orcid":"0000-0003-4042-4951","first_name":"Stefan","full_name":"Schumacher, Stefan"}],"title":"On-demand indistinguishable and entangled photons at telecom frequencies using tailored cavity designs","status":"public","year":"2023"},{"status":"public","has_accepted_license":"1","page":"101207","publisher":"Elsevier BV","_id":"50012","user_id":"158","ddc":["530"],"volume":58,"file_date_updated":"2023-12-21T09:34:17Z","citation":{"apa":"Farheen, H., Strauch, A., Scheytt, J. C., Myroshnychenko, V., &#38; Förstner, J. (2023). Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays. <i>Photonics and Nanostructures - Fundamentals and Applications</i>, <i>58</i>, 101207. <a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">https://doi.org/10.1016/j.photonics.2023.101207</a>","ieee":"H. Farheen, A. Strauch, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays,” <i>Photonics and Nanostructures - Fundamentals and Applications</i>, vol. 58, p. 101207, 2023, doi: <a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">10.1016/j.photonics.2023.101207</a>.","chicago":"Farheen, Henna, Andreas Strauch, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays.” <i>Photonics and Nanostructures - Fundamentals and Applications</i> 58 (2023): 101207. <a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">https://doi.org/10.1016/j.photonics.2023.101207</a>.","short":"H. Farheen, A. Strauch, J.C. Scheytt, V. Myroshnychenko, J. Förstner, Photonics and Nanostructures - Fundamentals and Applications 58 (2023) 101207.","mla":"Farheen, Henna, et al. “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays.” <i>Photonics and Nanostructures - Fundamentals and Applications</i>, vol. 58, Elsevier BV, 2023, p. 101207, doi:<a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">10.1016/j.photonics.2023.101207</a>.","ama":"Farheen H, Strauch A, Scheytt JC, Myroshnychenko V, Förstner J. Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays. <i>Photonics and Nanostructures - Fundamentals and Applications</i>. 2023;58:101207. doi:<a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">10.1016/j.photonics.2023.101207</a>","bibtex":"@article{Farheen_Strauch_Scheytt_Myroshnychenko_Förstner_2023, title={Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays}, volume={58}, DOI={<a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">10.1016/j.photonics.2023.101207</a>}, 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} }"},"project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","grant_number":"PROFILNRW-2020-067","_id":"266"},{"grant_number":"231447078","_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"oa":"1","year":"2023","title":"Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays","publication_identifier":{"issn":["1569-4410"]},"author":[{"first_name":"Henna","orcid":"0000-0001-7730-3489","last_name":"Farheen","full_name":"Farheen, Henna","id":"53444"},{"full_name":"Strauch, Andreas","first_name":"Andreas","last_name":"Strauch"},{"full_name":"Scheytt, J. Christoph","last_name":"Scheytt","first_name":"J. Christoph","orcid":"0000-0002-5950-6618 ","id":"37144"},{"last_name":"Myroshnychenko","first_name":"Viktor","full_name":"Myroshnychenko, Viktor","id":"46371"},{"full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","id":"158"}],"publication_status":"published","date_updated":"2024-07-22T07:44:33Z","intvolume":"        58","language":[{"iso":"eng"}],"doi":"10.1016/j.photonics.2023.101207","publication":"Photonics and Nanostructures - Fundamentals and Applications","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"}],"related_material":{"link":[{"relation":"research_data","url":"https://doi.org/10.5281/zenodo.10044122"}]},"file":[{"creator":"fossie","date_created":"2023-12-21T09:34:17Z","date_updated":"2023-12-21T09:34:17Z","relation":"main_file","access_level":"open_access","file_size":3339442,"file_name":"2ß23-12 Farheen - PNFA - Optimized, highly efficient silicon antennas for optical phased arrays.pdf","content_type":"application/pdf","file_id":"50013"}],"date_created":"2023-12-21T09:30:03Z","type":"journal_article","keyword":["tet_topic_opticalantenna"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"58"}]},{"project":[{"grant_number":"231447078","_id":"53","name":"TRR 142: TRR 142"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"TRR 142 - B06: TRR 142 - Subproject B06","_id":"167","grant_number":"231447078"}],"citation":{"bibtex":"@article{Hammer_Farheen_Förstner_2023, title={How to suppress radiative losses in high-contrast integrated Bragg gratings}, volume={40}, DOI={<a href=\"https://doi.org/10.1364/josab.485725\">10.1364/josab.485725</a>}, 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} }","ama":"Hammer M, Farheen H, Förstner J. How to suppress radiative losses in high-contrast integrated Bragg gratings. <i>Journal of the Optical Society of America B</i>. 2023;40(4):862. doi:<a href=\"https://doi.org/10.1364/josab.485725\">10.1364/josab.485725</a>","mla":"Hammer, Manfred, et al. “How to Suppress Radiative Losses in High-Contrast Integrated Bragg Gratings.” <i>Journal of the Optical Society of America B</i>, vol. 40, no. 4, Optica Publishing Group, 2023, p. 862, doi:<a href=\"https://doi.org/10.1364/josab.485725\">10.1364/josab.485725</a>.","chicago":"Hammer, Manfred, Henna Farheen, and Jens Förstner. “How to Suppress Radiative Losses in High-Contrast Integrated Bragg Gratings.” <i>Journal of the Optical Society of America B</i> 40, no. 4 (2023): 862. <a href=\"https://doi.org/10.1364/josab.485725\">https://doi.org/10.1364/josab.485725</a>.","short":"M. Hammer, H. Farheen, J. Förstner, Journal of the Optical Society of America B 40 (2023) 862.","ieee":"M. Hammer, H. Farheen, and J. Förstner, “How to suppress radiative losses in high-contrast integrated Bragg gratings,” <i>Journal of the Optical Society of America B</i>, vol. 40, no. 4, p. 862, 2023, doi: <a href=\"https://doi.org/10.1364/josab.485725\">10.1364/josab.485725</a>.","apa":"Hammer, M., Farheen, H., &#38; Förstner, J. (2023). How to suppress radiative losses in high-contrast integrated Bragg gratings. <i>Journal of the Optical Society of America B</i>, <i>40</i>(4), 862. <a href=\"https://doi.org/10.1364/josab.485725\">https://doi.org/10.1364/josab.485725</a>"},"file_date_updated":"2023-03-31T13:14:59Z","oa":"1","has_accepted_license":"1","status":"public","volume":40,"ddc":["530"],"user_id":"158","publisher":"Optica Publishing Group","_id":"43245","page":"862","abstract":[{"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.","lang":"eng"}],"issue":"4","publication":"Journal of the Optical Society of America B","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"keyword":["tet_topic_waveguide"],"type":"journal_article","date_created":"2023-03-31T13:04:43Z","file":[{"date_created":"2023-03-31T13:14:59Z","creator":"fossie","file_id":"43247","content_type":"application/pdf","file_name":"ogr-afterreview.pdf","file_size":1982311,"access_level":"open_access","relation":"main_file","date_updated":"2023-03-31T13:14:59Z"}],"intvolume":"        40","date_updated":"2024-07-22T07:44:38Z","publication_status":"published","publication_identifier":{"issn":["0740-3224","1520-8540"]},"author":[{"id":"48077","full_name":"Hammer, Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348","first_name":"Manfred"},{"id":"53444","orcid":"0000-0001-7730-3489","last_name":"Farheen","first_name":"Henna","full_name":"Farheen, Henna"},{"id":"158","full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens"}],"title":"How to suppress radiative losses in high-contrast integrated Bragg gratings","year":"2023","doi":"10.1364/josab.485725","language":[{"iso":"eng"}]},{"date_updated":"2024-07-22T07:44:46Z","publication_status":"published","author":[{"id":"53444","first_name":"Henna","orcid":"0000-0001-7730-3489","last_name":"Farheen","full_name":"Farheen, Henna"},{"full_name":"Strauch, Andreas","last_name":"Strauch","first_name":"Andreas"},{"orcid":"https://orcid.org/0000-0002-5950-6618","last_name":"Scheytt","first_name":"J. Christoph","full_name":"Scheytt, J. Christoph","id":"37144"},{"first_name":"Viktor","last_name":"Myroshnychenko","full_name":"Myroshnychenko, Viktor","id":"46371"},{"last_name":"Förstner","first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","id":"158"}],"year":"2023","title":"Optimized silicon antennas for optical phased arrays","doi":"10.1117/12.2658716","language":[{"iso":"eng"}],"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."}],"publication":"Integrated Optics: Devices, Materials, and Technologies XXVII","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"keyword":["tet_topic_opticalantenna"],"type":"conference","date_created":"2023-03-21T12:35:18Z","file":[{"date_created":"2023-03-22T07:41:49Z","creator":"fossie","file_id":"43055","content_type":"application/pdf","file_name":"2023-01 Poster Photonics West Henna OPA_A0.pdf","access_level":"request","file_size":1747396,"relation":"main_file","date_updated":"2023-03-22T20:53:11Z"}],"has_accepted_license":"1","status":"public","editor":[{"first_name":"Sonia M.","last_name":"García-Blanco","full_name":"García-Blanco, Sonia M."},{"first_name":"Pavel","last_name":"Cheben","full_name":"Cheben, Pavel"}],"ddc":["530"],"user_id":"158","_id":"43052","publisher":"SPIE","page":"124241D ","citation":{"mla":"Farheen, Henna, et al. “Optimized Silicon Antennas for Optical Phased Arrays.” <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2023, p. 124241D, doi:<a href=\"https://doi.org/10.1117/12.2658716\">10.1117/12.2658716</a>.","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. <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>. SPIE; 2023:124241D. doi:<a href=\"https://doi.org/10.1117/12.2658716\">10.1117/12.2658716</a>","bibtex":"@inproceedings{Farheen_Strauch_Scheytt_Myroshnychenko_Förstner_2023, title={Optimized silicon antennas for optical phased arrays}, DOI={<a href=\"https://doi.org/10.1117/12.2658716\">10.1117/12.2658716</a>}, 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} }","apa":"Farheen, H., Strauch, A., Scheytt, J. C., Myroshnychenko, V., &#38; Förstner, J. (2023). Optimized silicon antennas for optical phased arrays. In S. M. García-Blanco &#38; P. Cheben (Eds.), <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i> (p. 124241D). SPIE. <a href=\"https://doi.org/10.1117/12.2658716\">https://doi.org/10.1117/12.2658716</a>","ieee":"H. Farheen, A. Strauch, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Optimized silicon antennas for optical phased arrays,” in <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, 2023, p. 124241D, doi: <a href=\"https://doi.org/10.1117/12.2658716\">10.1117/12.2658716</a>.","chicago":"Farheen, Henna, Andreas Strauch, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Optimized Silicon Antennas for Optical Phased Arrays.” In <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, edited by Sonia M. García-Blanco and Pavel Cheben, 124241D. SPIE, 2023. <a href=\"https://doi.org/10.1117/12.2658716\">https://doi.org/10.1117/12.2658716</a>.","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."},"file_date_updated":"2023-03-22T20:53:11Z"},{"date_updated":"2024-07-22T07:48:53Z","publication_status":"published","year":"2023","title":"Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas","status":"public","author":[{"id":"53444","full_name":"Farheen, Henna","orcid":"0000-0001-7730-3489","first_name":"Henna","last_name":"Farheen"},{"first_name":"S.","last_name":"Joshi","full_name":"Joshi, S."},{"full_name":"Scheytt, J. Christoph","orcid":"0000-0002-5950-6618 ","first_name":"J. Christoph","last_name":"Scheytt","id":"37144"},{"first_name":"Viktor","last_name":"Myroshnychenko","full_name":"Myroshnychenko, Viktor","id":"46371"},{"id":"158","orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","full_name":"Förstner, Jens"}],"doi":"10.1109/ipc57732.2023.10360519","user_id":"158","_id":"50466","publisher":"IEEE","language":[{"iso":"eng"}],"abstract":[{"text":"A key challenge in designing efficient optical phased arrays is the lack of a well-designed radiator. This work explores horn antennas numerically optimized to target high upward radiation efficiency to be employed in silicon-based phased arrays capable of producing elegant radiation patterns in the far-field.","lang":"eng"}],"project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","grant_number":"PROFILNRW-2020-067","_id":"266"},{"grant_number":"231447078","_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)"},{"grant_number":"231447078","_id":"75","name":"TRR 142 - C05: TRR 142 - Nichtlineare optische Oberflächen basierend auf ZnO-plasmonischen Hybrid-Nanostrukturen (C05)"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"publication":"2023 IEEE Photonics Conference (IPC)","citation":{"mla":"Farheen, Henna, et al. “Increasing the Upward Radiation Efficiency of Optical Phased Arrays Using Asymmetric Silicon Horn Antennas.” <i>2023 IEEE Photonics Conference (IPC)</i>, IEEE, 2023, doi:<a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">10.1109/ipc57732.2023.10360519</a>.","bibtex":"@inproceedings{Farheen_Joshi_Scheytt_Myroshnychenko_Förstner_2023, title={Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas}, DOI={<a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">10.1109/ipc57732.2023.10360519</a>}, booktitle={2023 IEEE Photonics Conference (IPC)}, publisher={IEEE}, author={Farheen, Henna and Joshi, S. and Scheytt, J. Christoph and Myroshnychenko, Viktor and Förstner, Jens}, year={2023} }","ama":"Farheen H, Joshi S, Scheytt JC, Myroshnychenko V, Förstner J. Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas. In: <i>2023 IEEE Photonics Conference (IPC)</i>. IEEE; 2023. doi:<a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">10.1109/ipc57732.2023.10360519</a>","ieee":"H. Farheen, S. Joshi, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas,” 2023, doi: <a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">10.1109/ipc57732.2023.10360519</a>.","apa":"Farheen, H., Joshi, S., Scheytt, J. C., Myroshnychenko, V., &#38; Förstner, J. (2023). Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas. <i>2023 IEEE Photonics Conference (IPC)</i>. <a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">https://doi.org/10.1109/ipc57732.2023.10360519</a>","chicago":"Farheen, Henna, S. Joshi, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Increasing the Upward Radiation Efficiency of Optical Phased Arrays Using Asymmetric Silicon Horn Antennas.” In <i>2023 IEEE Photonics Conference (IPC)</i>. IEEE, 2023. <a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">https://doi.org/10.1109/ipc57732.2023.10360519</a>.","short":"H. Farheen, S. Joshi, J.C. Scheytt, V. Myroshnychenko, J. Förstner, in: 2023 IEEE Photonics Conference (IPC), IEEE, 2023."},"type":"conference","keyword":["tet_topic_opticalantenna"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"date_created":"2024-01-12T07:37:54Z"},{"doi":"10.1016/j.jqsrt.2023.108557","article_number":"108557","language":[{"iso":"eng"}],"date_updated":"2023-03-15T17:36:13Z","publication_status":"published","intvolume":"       302","title":"Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength","year":"2023","publication_identifier":{"issn":["0022-4073"]},"author":[{"first_name":"Samer","last_name":"Alhaddad","full_name":"Alhaddad, Samer","id":"42456"},{"full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","id":"158"},{"full_name":"Grynko, Yevgen","last_name":"Grynko","first_name":"Yevgen","id":"26059"}],"type":"journal_article","keyword":["tet_topic_scattering"],"department":[{"_id":"61"}],"file":[{"access_level":"local","file_size":1508833,"file_name":"2023-03 Alhaddad - JQSRT - Numerical study of light backscattering from layers of absorbing particles larger than the wavelength.pdf","date_updated":"2023-03-15T15:58:15Z","relation":"main_file","content_type":"application/pdf","file_id":"43028","creator":"fossie","date_created":"2023-03-15T15:58:15Z"},{"date_created":"2023-03-15T17:35:29Z","creator":"fossie","content_type":"application/pdf","file_id":"43029","file_size":4254386,"access_level":"open_access","file_name":"2023-03 Alhaddad - JQSRT - Numerical study of light backscattering from layers of absorbing particles larger than the wavelength (accepted manuscript).pdf","date_updated":"2023-03-15T17:35:29Z","relation":"main_file"}],"date_created":"2023-03-14T12:32:54Z","publication":"Journal of Quantitative Spectroscopy and Radiative Transfer","ddc":["530"],"user_id":"158","volume":302,"publisher":"Elsevier BV","_id":"43018","has_accepted_license":"1","status":"public","oa":"1","project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"file_date_updated":"2023-03-15T17:35:29Z","citation":{"ama":"Alhaddad S, Förstner J, Grynko Y. Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength. <i>Journal of Quantitative Spectroscopy and Radiative Transfer</i>. 2023;302. doi:<a href=\"https://doi.org/10.1016/j.jqsrt.2023.108557\">10.1016/j.jqsrt.2023.108557</a>","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={<a href=\"https://doi.org/10.1016/j.jqsrt.2023.108557\">10.1016/j.jqsrt.2023.108557</a>}, number={108557}, journal={Journal of Quantitative Spectroscopy and Radiative Transfer}, publisher={Elsevier BV}, author={Alhaddad, Samer and Förstner, Jens and Grynko, Yevgen}, year={2023} }","mla":"Alhaddad, Samer, et al. “Numerical Study of Light Backscattering from Layers of Absorbing Irregular Particles Larger than the Wavelength.” <i>Journal of Quantitative Spectroscopy and Radiative Transfer</i>, vol. 302, 108557, Elsevier BV, 2023, doi:<a href=\"https://doi.org/10.1016/j.jqsrt.2023.108557\">10.1016/j.jqsrt.2023.108557</a>.","chicago":"Alhaddad, Samer, Jens Förstner, and Yevgen Grynko. “Numerical Study of Light Backscattering from Layers of Absorbing Irregular Particles Larger than the Wavelength.” <i>Journal of Quantitative Spectroscopy and Radiative Transfer</i> 302 (2023). <a href=\"https://doi.org/10.1016/j.jqsrt.2023.108557\">https://doi.org/10.1016/j.jqsrt.2023.108557</a>.","short":"S. Alhaddad, J. Förstner, Y. Grynko, Journal of Quantitative Spectroscopy and Radiative Transfer 302 (2023).","apa":"Alhaddad, S., Förstner, J., &#38; Grynko, Y. (2023). Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength. <i>Journal of Quantitative Spectroscopy and Radiative Transfer</i>, <i>302</i>, Article 108557. <a href=\"https://doi.org/10.1016/j.jqsrt.2023.108557\">https://doi.org/10.1016/j.jqsrt.2023.108557</a>","ieee":"S. Alhaddad, J. Förstner, and Y. Grynko, “Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength,” <i>Journal of Quantitative Spectroscopy and Radiative Transfer</i>, vol. 302, Art. no. 108557, 2023, doi: <a href=\"https://doi.org/10.1016/j.jqsrt.2023.108557\">10.1016/j.jqsrt.2023.108557</a>."}},{"publication_identifier":{"issn":["2047-7538"]},"author":[{"first_name":"David","last_name":"Hähnel","full_name":"Hähnel, David"},{"full_name":"Golla, Christian","first_name":"Christian","last_name":"Golla"},{"full_name":"Albert, Maximilian","first_name":"Maximilian","last_name":"Albert"},{"first_name":"Thomas","last_name":"Zentgraf","orcid":"0000-0002-8662-1101","full_name":"Zentgraf, Thomas","id":"30525"},{"id":"46371","full_name":"Myroshnychenko, Viktor","first_name":"Viktor","last_name":"Myroshnychenko"},{"last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens","full_name":"Förstner, Jens","id":"158"},{"last_name":"Meier","orcid":"https://orcid.org/0000-0002-3787-3572","first_name":"Cedrik","full_name":"Meier, Cedrik","id":"20798"}],"title":"A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces","year":"2023","intvolume":"        12","article_type":"original","date_updated":"2023-04-21T10:04:05Z","publication_status":"published","language":[{"iso":"eng"}],"doi":"https://doi.org/10.1038/s41377-023-01134-1","issue":"1","publication":"Light: Science & Applications","abstract":[{"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.","lang":"eng"}],"date_created":"2023-04-21T09:45:07Z","file":[{"creator":"fossie","date_created":"2023-04-21T10:00:27Z","file_size":2088874,"access_level":"open_access","file_name":"2023-04 Hähnel - LSA - Multimode Fano THG.pdf","date_updated":"2023-04-21T10:00:27Z","relation":"main_file","content_type":"application/pdf","file_id":"44098"},{"creator":"fossie","date_created":"2023-04-21T10:03:30Z","access_level":"open_access","file_size":986743,"file_name":"2023-04 Hähnel - LSA - Multimode Fano THG (supplementary information).pdf","date_updated":"2023-04-21T10:03:30Z","relation":"supplementary_material","content_type":"application/pdf","file_id":"44099"}],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"type":"journal_article","keyword":["tet_topic_meta"],"status":"public","has_accepted_license":"1","_id":"44097","publisher":"Springer Nature","page":"97","volume":12,"ddc":["530"],"user_id":"158","citation":{"mla":"Hähnel, David, et al. “A Multi-Mode Super-Fano Mechanism for Enhanced Third Harmonic Generation in Silicon Metasurfaces.” <i>Light: Science &#38; Applications</i>, vol. 12, no. 1, Springer Nature, 2023, p. 97, doi:<a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>.","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={<a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>}, number={1}, journal={Light: Science &#38; 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} }","ama":"Hähnel D, Golla C, Albert M, et al. A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. <i>Light: Science &#38; Applications</i>. 2023;12(1):97. doi:<a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>","ieee":"D. Hähnel <i>et al.</i>, “A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces,” <i>Light: Science &#38; Applications</i>, vol. 12, no. 1, p. 97, 2023, doi: <a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>.","apa":"Hähnel, D., Golla, C., Albert, M., Zentgraf, T., Myroshnychenko, V., Förstner, J., &#38; Meier, C. (2023). A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. <i>Light: Science &#38; Applications</i>, <i>12</i>(1), 97. <a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>","short":"D. Hähnel, C. Golla, M. Albert, T. Zentgraf, V. Myroshnychenko, J. Förstner, C. Meier, Light: Science &#38; Applications 12 (2023) 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.” <i>Light: Science &#38; Applications</i> 12, no. 1 (2023): 97. <a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>."},"file_date_updated":"2023-04-21T10:03:30Z","quality_controlled":"1","oa":"1"},{"citation":{"chicago":"Hähnel, David, Jens Förstner, and Viktor Myroshnychenko. “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.” <i>ACS Photonics</i>, 2023. <a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">https://doi.org/10.1021/acsphotonics.2c01967</a>.","short":"D. Hähnel, J. Förstner, V. Myroshnychenko, ACS Photonics (2023).","ieee":"D. Hähnel, J. Förstner, and V. Myroshnychenko, “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces,” <i>ACS Photonics</i>, 2023, doi: <a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">10.1021/acsphotonics.2c01967</a>.","apa":"Hähnel, D., Förstner, J., &#38; Myroshnychenko, V. (2023). Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces. <i>ACS Photonics</i>. <a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">https://doi.org/10.1021/acsphotonics.2c01967</a>","bibtex":"@article{Hähnel_Förstner_Myroshnychenko_2023, title={Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces}, DOI={<a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">10.1021/acsphotonics.2c01967</a>}, journal={ACS Photonics}, publisher={American Chemical Society (ACS)}, author={Hähnel, David and Förstner, Jens and Myroshnychenko, Viktor}, year={2023} }","ama":"Hähnel D, Förstner J, Myroshnychenko V. Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces. <i>ACS Photonics</i>. Published online 2023. doi:<a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">10.1021/acsphotonics.2c01967</a>","mla":"Hähnel, David, et al. “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.” <i>ACS Photonics</i>, American Chemical Society (ACS), 2023, doi:<a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">10.1021/acsphotonics.2c01967</a>."},"file_date_updated":"2023-06-13T09:48:17Z","project":[{"grant_number":"231447078","_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53","grant_number":"231447078"},{"name":"TRR 142 - C05: TRR 142 - Nichtlineare optische Oberflächen basierend auf ZnO-plasmonischen Hybrid-Nanostrukturen (C05)","_id":"75","grant_number":"231447078"},{"name":"TRR 142 - C: TRR 142 - Project Area C","_id":"56"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"oa":"1","status":"public","has_accepted_license":"1","publisher":"American Chemical Society (ACS)","_id":"45596","ddc":["530"],"user_id":"158","publication":"ACS Photonics","abstract":[{"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.","lang":"eng"}],"date_created":"2023-06-13T09:43:25Z","file":[{"file_id":"45597","content_type":"application/pdf","relation":"main_file","date_updated":"2023-06-13T09:48:17Z","file_name":"2023-06 Hähnel - ACS Photonics - Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.pdf","file_size":5382111,"access_level":"open_access","date_created":"2023-06-13T09:48:17Z","creator":"fossie"}],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"type":"journal_article","keyword":["tet_topic_meta"],"author":[{"full_name":"Hähnel, David","last_name":"Hähnel","first_name":"David"},{"id":"158","first_name":"Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens"},{"id":"46371","full_name":"Myroshnychenko, Viktor","last_name":"Myroshnychenko","first_name":"Viktor"}],"publication_identifier":{"issn":["2330-4022","2330-4022"]},"year":"2023","title":"Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces","date_updated":"2023-06-13T09:49:12Z","publication_status":"published","language":[{"iso":"eng"}],"main_file_link":[{"open_access":"1"}],"doi":"10.1021/acsphotonics.2c01967"},{"date_updated":"2025-05-23T05:57:14Z","publication_status":"published","title":"Tailoring the directive nature of optical waveguide antennas","year":"2023","author":[{"first_name":"Henna","last_name":"Farheen","orcid":"0000-0001-7730-3489","full_name":"Farheen, Henna","id":"53444"},{"last_name":"Yan","first_name":"Lok-Yee","full_name":"Yan, Lok-Yee"},{"full_name":"Leuteritz, Till","last_name":"Leuteritz","first_name":"Till"},{"last_name":"Qiao","first_name":"Siqi","full_name":"Qiao, Siqi"},{"full_name":"Spreyer, Florian","last_name":"Spreyer","first_name":"Florian"},{"first_name":"Christian","last_name":"Schlickriede","full_name":"Schlickriede, Christian"},{"full_name":"Quiring, Viktor","first_name":"Viktor","last_name":"Quiring"},{"last_name":"Eigner","first_name":"Christof","full_name":"Eigner, Christof"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"},{"id":"30525","orcid":"0000-0002-8662-1101","first_name":"Thomas","last_name":"Zentgraf","full_name":"Zentgraf, Thomas"},{"full_name":"Linden, Stefan","first_name":"Stefan","last_name":"Linden"},{"last_name":"Myroshnychenko","first_name":"Viktor","full_name":"Myroshnychenko, Viktor","id":"46371"},{"id":"158","last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens","full_name":"Förstner, Jens"}],"doi":"10.1117/12.2658921","language":[{"iso":"eng"}],"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."}],"publication":"Integrated Optics: Devices, Materials, and Technologies XXVII","type":"conference","keyword":["tet_topic_opticalantenna"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"file":[{"file_id":"43062","content_type":"application/pdf","relation":"main_file","date_updated":"2023-03-22T09:25:57Z","file_name":"2023-01 Poster Photonics West Henna OWA_A0.pdf","access_level":"local","file_size":1426599,"date_created":"2023-03-22T09:25:57Z","creator":"fossie"}],"date_created":"2023-03-21T12:28:31Z","has_accepted_license":"1","status":"public","ddc":["530"],"user_id":"30525","editor":[{"first_name":"Sonia M.","last_name":"García-Blanco","full_name":"García-Blanco, Sonia M."},{"last_name":"Cheben","first_name":"Pavel","full_name":"Cheben, Pavel"}],"page":"124241E","publisher":"SPIE","_id":"43051","project":[{"name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53","grant_number":"231447078"},{"name":"TRR 142 - A08: TRR 142 - Nichtlineare Kopplung von Zwischenschicht-Exzitonen in van der Waals-Heterostrukturen an plasmonische und dielektrische Nanokavitäten (A08)","_id":"65","grant_number":"231447078"}],"file_date_updated":"2023-03-22T09:25:57Z","citation":{"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={<a href=\"https://doi.org/10.1117/12.2658921\">10.1117/12.2658921</a>}, 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} }","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. <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>. SPIE; 2023:124241E. doi:<a href=\"https://doi.org/10.1117/12.2658921\">10.1117/12.2658921</a>","mla":"Farheen, Henna, et al. “Tailoring the Directive Nature of Optical Waveguide Antennas.” <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2023, p. 124241E, doi:<a href=\"https://doi.org/10.1117/12.2658921\">10.1117/12.2658921</a>.","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 <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, edited by Sonia M. García-Blanco and Pavel Cheben, 124241E. SPIE, 2023. <a href=\"https://doi.org/10.1117/12.2658921\">https://doi.org/10.1117/12.2658921</a>.","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.","ieee":"H. Farheen <i>et al.</i>, “Tailoring the directive nature of optical waveguide antennas,” in <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, 2023, p. 124241E, doi: <a href=\"https://doi.org/10.1117/12.2658921\">10.1117/12.2658921</a>.","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., &#38; Förstner, J. (2023). Tailoring the directive nature of optical waveguide antennas. In S. M. García-Blanco &#38; P. Cheben (Eds.), <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i> (p. 124241E). SPIE. <a href=\"https://doi.org/10.1117/12.2658921\">https://doi.org/10.1117/12.2658921</a>"}},{"status":"public","_id":"61252","publisher":"Wiley","volume":7,"user_id":"16199","citation":{"ieee":"D. Bauch, D. Siebert, K. D. Jöns, J. Förstner, and S. Schumacher, “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs,” <i>Advanced Quantum Technologies</i>, vol. 7, no. 1, Art. no. 2300142, 2023, doi: <a href=\"https://doi.org/10.1002/qute.202300142\">10.1002/qute.202300142</a>.","apa":"Bauch, D., Siebert, D., Jöns, K. D., Förstner, J., &#38; Schumacher, S. (2023). On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs. <i>Advanced Quantum Technologies</i>, <i>7</i>(1), Article 2300142. <a href=\"https://doi.org/10.1002/qute.202300142\">https://doi.org/10.1002/qute.202300142</a>","chicago":"Bauch, David, Dustin Siebert, Klaus D. Jöns, Jens Förstner, and Stefan Schumacher. “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs.” <i>Advanced Quantum Technologies</i> 7, no. 1 (2023). <a href=\"https://doi.org/10.1002/qute.202300142\">https://doi.org/10.1002/qute.202300142</a>.","short":"D. Bauch, D. Siebert, K.D. Jöns, J. Förstner, S. Schumacher, Advanced Quantum Technologies 7 (2023).","mla":"Bauch, David, et al. “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs.” <i>Advanced Quantum Technologies</i>, vol. 7, no. 1, 2300142, Wiley, 2023, doi:<a href=\"https://doi.org/10.1002/qute.202300142\">10.1002/qute.202300142</a>.","bibtex":"@article{Bauch_Siebert_Jöns_Förstner_Schumacher_2023, title={On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs}, volume={7}, DOI={<a href=\"https://doi.org/10.1002/qute.202300142\">10.1002/qute.202300142</a>}, number={12300142}, journal={Advanced Quantum Technologies}, publisher={Wiley}, author={Bauch, David and Siebert, Dustin and Jöns, Klaus D. and Förstner, Jens and Schumacher, Stefan}, year={2023} }","ama":"Bauch D, Siebert D, Jöns KD, Förstner J, Schumacher S. On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs. <i>Advanced Quantum Technologies</i>. 2023;7(1). doi:<a href=\"https://doi.org/10.1002/qute.202300142\">10.1002/qute.202300142</a>"},"project":[{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"_id":"55","name":"TRR 142 - Project Area B"},{"_id":"56","name":"TRR 142 - Project Area C"},{"name":"TRR 142; TP B06: Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems","_id":"167"},{"name":"TRR 142; TP C09: Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen","_id":"173"},{"_id":"266","name":"PhoQC: Photonisches Quantencomputing"}],"publication_identifier":{"issn":["2511-9044","2511-9044"]},"author":[{"last_name":"Bauch","first_name":"David","full_name":"Bauch, David"},{"full_name":"Siebert, Dustin","first_name":"Dustin","last_name":"Siebert"},{"id":"85353","last_name":"Jöns","first_name":"Klaus D.","full_name":"Jöns, Klaus D."},{"id":"158","full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens"},{"id":"27271","last_name":"Schumacher","first_name":"Stefan","orcid":"0000-0003-4042-4951","full_name":"Schumacher, Stefan"}],"title":"On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs","year":"2023","intvolume":"         7","date_updated":"2025-09-12T11:16:12Z","publication_status":"published","language":[{"iso":"eng"}],"article_number":"2300142","doi":"10.1002/qute.202300142","publication":"Advanced Quantum Technologies","issue":"1","abstract":[{"lang":"eng","text":"<jats:title>Abstract</jats:title><jats:p>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, 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.</jats:p>"}],"date_created":"2025-09-12T11:11:56Z","department":[{"_id":"15"},{"_id":"170"},{"_id":"297"},{"_id":"642"},{"_id":"61"},{"_id":"230"},{"_id":"35"},{"_id":"34"},{"_id":"429"},{"_id":"27"},{"_id":"623"}],"type":"journal_article"},{"citation":{"apa":"Lange, S., Hilleringmann, U., Hedayat, C., Kuhn, H., &#38; Förstner, J. (2023). Characterization of Various Environmental Influences on the Inductive Localization. <i>2023 IEEE Conference on Antenna Measurements and Applications (CAMA)</i>. 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), Genoa, Italy . <a href=\"https://doi.org/10.1109/cama57522.2023.10352780\">https://doi.org/10.1109/cama57522.2023.10352780</a>","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: <a href=\"https://doi.org/10.1109/cama57522.2023.10352780\">10.1109/cama57522.2023.10352780</a>.","chicago":"Lange, Sven, Ulrich Hilleringmann, Christian Hedayat, Harald Kuhn, and Jens Förstner. “Characterization of Various Environmental Influences on the Inductive Localization.” In <i>2023 IEEE Conference on Antenna Measurements and Applications (CAMA)</i>. Genoa, Italy : IEEE, 2023. <a href=\"https://doi.org/10.1109/cama57522.2023.10352780\">https://doi.org/10.1109/cama57522.2023.10352780</a>.","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.” <i>2023 IEEE Conference on Antenna Measurements and Applications (CAMA)</i>, IEEE, 2023, doi:<a href=\"https://doi.org/10.1109/cama57522.2023.10352780\">10.1109/cama57522.2023.10352780</a>.","ama":"Lange S, Hilleringmann U, Hedayat C, Kuhn H, Förstner J. Characterization of Various Environmental Influences on the Inductive Localization. In: <i>2023 IEEE Conference on Antenna Measurements and Applications (CAMA)</i>. IEEE; 2023. doi:<a href=\"https://doi.org/10.1109/cama57522.2023.10352780\">10.1109/cama57522.2023.10352780</a>","bibtex":"@inproceedings{Lange_Hilleringmann_Hedayat_Kuhn_Förstner_2023, place={Genoa, Italy }, title={Characterization of Various Environmental Influences on the Inductive Localization}, DOI={<a href=\"https://doi.org/10.1109/cama57522.2023.10352780\">10.1109/cama57522.2023.10352780</a>}, 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} }"},"place":"Genoa, Italy ","conference":{"end_date":"2023-11-17","start_date":"2023-11-15","name":"2023 IEEE Conference on Antenna Measurements and Applications (CAMA)","location":"Genoa, Italy "},"status":"public","_id":"49890","publisher":"IEEE","user_id":"158","publication":"2023 IEEE Conference on Antenna Measurements and Applications (CAMA)","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."}],"date_created":"2023-12-20T08:36:58Z","department":[{"_id":"59"},{"_id":"61"},{"_id":"485"}],"keyword":["Planar coils","inductive locating","magnetic fields","environmental influences","eddy currents","tet_topic_hf","tet_enas"],"type":"conference","publication_identifier":{"eisbn":["979-8-3503-2304-7"]},"author":[{"id":"38240","full_name":"Lange, Sven","orcid":"0009-0007-9150-2266 ","last_name":"Lange","first_name":"Sven"},{"full_name":"Hilleringmann, Ulrich","first_name":"Ulrich","last_name":"Hilleringmann","id":"20179"},{"first_name":"Christian","last_name":"Hedayat","full_name":"Hedayat, Christian"},{"first_name":"Harald","last_name":"Kuhn","full_name":"Kuhn, Harald"},{"full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","id":"158"}],"year":"2023","title":"Characterization of Various Environmental Influences on the Inductive Localization","date_updated":"2024-11-30T19:31:57Z","publication_status":"published","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://ieeexplore.ieee.org/document/10352780"}],"doi":"10.1109/cama57522.2023.10352780"},{"project":[{"_id":"56","name":"TRR 142 - C: TRR 142 - Project Area C"},{"name":"TRR 142: TRR 142","_id":"53"},{"name":"TRR 142 - C5: TRR 142 - Subproject C5","_id":"75"}],"file_date_updated":"2022-03-22T18:03:50Z","citation":{"ieee":"M. Hammer, L. Ebers, and J. Förstner, “Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber,” in <i>Complex Light and Optical Forces XVI</i>, 2022, p. 120170F, doi: <a href=\"https://doi.org/10.1117/12.2612179\">10.1117/12.2612179</a>.","apa":"Hammer, M., Ebers, L., &#38; Förstner, J. (2022). Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber. In D. L. Andrews, E. J. Galvez, &#38; H. Rubinsztein-Dunlop (Eds.), <i>Complex Light and Optical Forces XVI</i> (p. 120170F). SPIE. <a href=\"https://doi.org/10.1117/12.2612179\">https://doi.org/10.1117/12.2612179</a>","chicago":"Hammer, Manfred, Lena Ebers, and Jens Förstner. “Resonant Evanescent Excitation of OAM Modes in a High-Contrast Circular Step-Index Fiber.” In <i>Complex Light and Optical Forces XVI</i>, edited by David L. Andrews, Enrique J. Galvez, and Halina Rubinsztein-Dunlop, 120170F. SPIE, 2022. <a href=\"https://doi.org/10.1117/12.2612179\">https://doi.org/10.1117/12.2612179</a>.","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.","mla":"Hammer, Manfred, et al. “Resonant Evanescent Excitation of OAM Modes in a High-Contrast Circular Step-Index Fiber.” <i>Complex Light and Optical Forces XVI</i>, edited by David L. Andrews et al., SPIE, 2022, p. 120170F, doi:<a href=\"https://doi.org/10.1117/12.2612179\">10.1117/12.2612179</a>.","bibtex":"@inproceedings{Hammer_Ebers_Förstner_2022, title={Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber}, DOI={<a href=\"https://doi.org/10.1117/12.2612179\">10.1117/12.2612179</a>}, 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} }","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. <i>Complex Light and Optical Forces XVI</i>. SPIE; 2022:120170F. doi:<a href=\"https://doi.org/10.1117/12.2612179\">10.1117/12.2612179</a>"},"oa":"1","has_accepted_license":"1","status":"public","ddc":["530"],"user_id":"158","editor":[{"full_name":"Andrews, David L.","first_name":"David L.","last_name":"Andrews"},{"last_name":"Galvez","first_name":"Enrique J.","full_name":"Galvez, Enrique J."},{"full_name":"Rubinsztein-Dunlop, Halina","last_name":"Rubinsztein-Dunlop","first_name":"Halina"}],"page":"120170F","_id":"30387","publisher":"SPIE","abstract":[{"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","lang":"eng"}],"publication":"Complex Light and Optical Forces XVI","keyword":["tet_topic_waveguide"],"type":"conference","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"file":[{"creator":"fossie","date_created":"2022-03-22T18:03:50Z","file_name":"2022-03 Hammer - SPIE Photonics West 2022 - Resonant evanescent excitation of OAM modes in a high-contrast circular (official version).pdf","access_level":"open_access","file_size":2015899,"relation":"main_file","date_updated":"2022-03-22T18:03:50Z","file_id":"30444","content_type":"application/pdf"}],"date_created":"2022-03-21T10:12:58Z","date_updated":"2022-03-22T18:04:20Z","publication_status":"published","title":"Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber","year":"2022","author":[{"orcid":"0000-0002-6331-9348","last_name":"Hammer","first_name":"Manfred","full_name":"Hammer, Manfred","id":"48077"},{"id":"40428","full_name":"Ebers, Lena","first_name":"Lena","last_name":"Ebers"},{"full_name":"Förstner, Jens","last_name":"Förstner","first_name":"Jens","orcid":"0000-0001-7059-9862","id":"158"}],"doi":"10.1117/12.2612179","language":[{"iso":"eng"}]},{"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."},{"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.","lang":"eng"}],"supervisor":[{"last_name":"Förstner","first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","id":"158"}],"citation":{"bibtex":"@book{Ebers_2022, title={Semi-guided waves in integrated optical waveguide structures}, DOI={<a href=\"https://doi.org/10.17619/UNIPB/1-1288\">10.17619/UNIPB/1-1288</a>}, author={Ebers, Lena}, year={2022} }","chicago":"Ebers, Lena. <i>Semi-Guided Waves in Integrated Optical Waveguide Structures</i>, 2022. <a href=\"https://doi.org/10.17619/UNIPB/1-1288\">https://doi.org/10.17619/UNIPB/1-1288</a>.","ama":"Ebers L. <i>Semi-Guided Waves in Integrated Optical Waveguide Structures</i>.; 2022. doi:<a href=\"https://doi.org/10.17619/UNIPB/1-1288\">10.17619/UNIPB/1-1288</a>","short":"L. Ebers, Semi-Guided Waves in Integrated Optical Waveguide Structures, 2022.","ieee":"L. Ebers, <i>Semi-guided waves in integrated optical waveguide structures</i>. 2022.","apa":"Ebers, L. (2022). <i>Semi-guided waves in integrated optical waveguide structures</i>. <a href=\"https://doi.org/10.17619/UNIPB/1-1288\">https://doi.org/10.17619/UNIPB/1-1288</a>","mla":"Ebers, Lena. <i>Semi-Guided Waves in Integrated Optical Waveguide Structures</i>. 2022, doi:<a href=\"https://doi.org/10.17619/UNIPB/1-1288\">10.17619/UNIPB/1-1288</a>."},"keyword":["tet_topic_waveguide"],"type":"dissertation","department":[{"_id":"61"},{"_id":"230"}],"date_created":"2022-03-29T18:42:08Z","date_updated":"2022-03-29T18:44:30Z","title":"Semi-guided waves in integrated optical waveguide structures","status":"public","year":"2022","author":[{"id":"40428","last_name":"Ebers","first_name":"Lena","full_name":"Ebers, Lena"}],"doi":"10.17619/UNIPB/1-1288","user_id":"158","_id":"30722","language":[{"iso":"eng"}]},{"volume":384,"user_id":"158","ddc":["530"],"_id":"31574","publisher":"Elsevier BV","page":"115099","has_accepted_license":"1","status":"public","oa":"1","project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"citation":{"mla":"Grynko, Yevgen, et al. “Negative Polarization of Light at Backscattering from a Numerical Analog of Planetary Regoliths.” <i>Icarus</i>, vol. 384, Elsevier BV, 2022, p. 115099, doi:<a href=\"https://doi.org/10.1016/j.icarus.2022.115099\">10.1016/j.icarus.2022.115099</a>.","ama":"Grynko Y, Shkuratov Y, Alhaddad S, Förstner J. Negative polarization of light at backscattering from a numerical analog of planetary regoliths. <i>Icarus</i>. 2022;384:115099. doi:<a href=\"https://doi.org/10.1016/j.icarus.2022.115099\">10.1016/j.icarus.2022.115099</a>","bibtex":"@article{Grynko_Shkuratov_Alhaddad_Förstner_2022, title={Negative polarization of light at backscattering from a numerical analog of planetary regoliths}, volume={384}, DOI={<a href=\"https://doi.org/10.1016/j.icarus.2022.115099\">10.1016/j.icarus.2022.115099</a>}, journal={Icarus}, publisher={Elsevier BV}, author={Grynko, Yevgen and Shkuratov, Yuriy and Alhaddad, Samer and Förstner, Jens}, year={2022}, pages={115099} }","apa":"Grynko, Y., Shkuratov, Y., Alhaddad, S., &#38; Förstner, J. (2022). Negative polarization of light at backscattering from a numerical analog of planetary regoliths. <i>Icarus</i>, <i>384</i>, 115099. <a href=\"https://doi.org/10.1016/j.icarus.2022.115099\">https://doi.org/10.1016/j.icarus.2022.115099</a>","ieee":"Y. Grynko, Y. Shkuratov, S. Alhaddad, and J. Förstner, “Negative polarization of light at backscattering from a numerical analog of planetary regoliths,” <i>Icarus</i>, vol. 384, p. 115099, 2022, doi: <a href=\"https://doi.org/10.1016/j.icarus.2022.115099\">10.1016/j.icarus.2022.115099</a>.","chicago":"Grynko, Yevgen, Yuriy Shkuratov, Samer Alhaddad, and Jens Förstner. “Negative Polarization of Light at Backscattering from a Numerical Analog of Planetary Regoliths.” <i>Icarus</i> 384 (2022): 115099. <a href=\"https://doi.org/10.1016/j.icarus.2022.115099\">https://doi.org/10.1016/j.icarus.2022.115099</a>.","short":"Y. Grynko, Y. Shkuratov, S. Alhaddad, J. Förstner, Icarus 384 (2022) 115099."},"file_date_updated":"2022-06-01T18:56:44Z","doi":"10.1016/j.icarus.2022.115099","language":[{"iso":"eng"}],"intvolume":"       384","publication_status":"published","date_updated":"2022-06-01T18:57:51Z","publication_identifier":{"issn":["0019-1035"]},"author":[{"id":"26059","full_name":"Grynko, Yevgen","last_name":"Grynko","first_name":"Yevgen"},{"first_name":"Yuriy","last_name":"Shkuratov","full_name":"Shkuratov, Yuriy"},{"first_name":"Samer","last_name":"Alhaddad","full_name":"Alhaddad, Samer","id":"42456"},{"full_name":"Förstner, Jens","last_name":"Förstner","first_name":"Jens","orcid":"0000-0001-7059-9862","id":"158"}],"title":"Negative polarization of light at backscattering from a numerical analog of planetary regoliths","year":"2022","department":[{"_id":"61"}],"type":"journal_article","keyword":["tet_topic_scattering"],"date_created":"2022-06-01T18:53:35Z","file":[{"file_id":"31575","content_type":"application/pdf","file_name":"2022-06 Grynko - Icarus - Negative polarization of light at backscattering from a numerical analog of planetary regoliths.pdf","file_size":1419286,"access_level":"open_access","relation":"main_file","date_updated":"2022-06-01T18:56:44Z","date_created":"2022-06-01T18:56:44Z","creator":"fossie"}],"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."}],"publication":"Icarus"},{"issue":"2","publication":"Optics Letters","abstract":[{"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.","lang":"eng"}],"file":[{"file_id":"35129","content_type":"application/pdf","embargo":"2024-01-03","relation":"main_file","date_updated":"2023-01-03T09:36:34Z","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,"access_level":"local","date_created":"2023-01-03T09:36:34Z","embargo_to":"open_access","creator":"fossie"}],"date_created":"2023-01-03T09:32:47Z","keyword":["tet_topic_waveguide"],"type":"journal_article","department":[{"_id":"61"},{"_id":"230"}],"title":"Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint","year":"2022","author":[{"last_name":"Nikbakht","first_name":"Hamed","full_name":"Nikbakht, Hamed"},{"last_name":"Khoshmehr","first_name":"Mohammad Talebi","full_name":"Khoshmehr, Mohammad Talebi"},{"full_name":"van Someren, Bob","last_name":"van Someren","first_name":"Bob"},{"full_name":"Teichrib, Dieter","last_name":"Teichrib","first_name":"Dieter"},{"first_name":"Manfred","orcid":"0000-0002-6331-9348","last_name":"Hammer","full_name":"Hammer, Manfred","id":"48077"},{"full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens","id":"158"},{"full_name":"Akca, B. Imran","last_name":"Akca","first_name":"B. Imran"}],"publication_identifier":{"issn":["0146-9592","1539-4794"]},"date_updated":"2023-01-03T10:37:34Z","publication_status":"published","intvolume":"        48","language":[{"iso":"eng"}],"doi":"10.1364/ol.476537","file_date_updated":"2023-01-03T09:36:34Z","citation":{"ieee":"H. Nikbakht <i>et al.</i>, “Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint,” <i>Optics Letters</i>, vol. 48, no. 2, p. 207, 2022, doi: <a href=\"https://doi.org/10.1364/ol.476537\">10.1364/ol.476537</a>.","apa":"Nikbakht, H., Khoshmehr, M. T., van Someren, B., Teichrib, D., Hammer, M., Förstner, J., &#38; Akca, B. I. (2022). Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint. <i>Optics Letters</i>, <i>48</i>(2), 207. <a href=\"https://doi.org/10.1364/ol.476537\">https://doi.org/10.1364/ol.476537</a>","short":"H. Nikbakht, M.T. Khoshmehr, B. van Someren, D. Teichrib, M. Hammer, J. Förstner, B.I. Akca, Optics Letters 48 (2022) 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.” <i>Optics Letters</i> 48, no. 2 (2022): 207. <a href=\"https://doi.org/10.1364/ol.476537\">https://doi.org/10.1364/ol.476537</a>.","mla":"Nikbakht, Hamed, et al. “Asymmetric, Non-Uniform 3-DB Directional Coupler with 300-Nm Bandwidth and a Small Footprint.” <i>Optics Letters</i>, vol. 48, no. 2, Optica Publishing Group, 2022, p. 207, doi:<a href=\"https://doi.org/10.1364/ol.476537\">10.1364/ol.476537</a>.","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={<a href=\"https://doi.org/10.1364/ol.476537\">10.1364/ol.476537</a>}, 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} }","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. <i>Optics Letters</i>. 2022;48(2):207. doi:<a href=\"https://doi.org/10.1364/ol.476537\">10.1364/ol.476537</a>"},"status":"public","has_accepted_license":"1","page":"207","_id":"35128","publisher":"Optica Publishing Group","ddc":["530"],"user_id":"158","volume":48},{"doi":"10.1007/978-3-031-10298-1_4","series_title":"Springer Series in Light Scattering","language":[{"iso":"eng"}],"main_file_link":[{"url":"https://rdcu.be/cV5GC","open_access":"1"}],"intvolume":"         8","date_updated":"2023-01-11T15:28:17Z","publication_status":"published","author":[{"id":"26059","last_name":"Grynko","first_name":"Yevgen","full_name":"Grynko, Yevgen"},{"last_name":"Shkuratov","first_name":"Yuriy","full_name":"Shkuratov, Yuriy"},{"last_name":"Alhaddad","first_name":"Samer","full_name":"Alhaddad, Samer","id":"42456"},{"full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","id":"158"}],"publication_identifier":{"isbn":["9783031102974","9783031102981"],"issn":["2509-2790","2509-2804"]},"year":"2022","title":"Light Scattering by Large Densely Packed Clusters of Particles","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"type":"book_chapter","keyword":["tet_topic_scattering"],"date_created":"2022-09-22T09:18:45Z","file":[{"relation":"main_file","date_updated":"2022-09-22T09:24:45Z","file_name":"2022-09 Grynko - Book chapter on Light Scattering by Large Densely Packed Clusters of Particles.pdf","access_level":"local","file_size":1525307,"file_id":"33467","content_type":"application/pdf","creator":"fossie","date_created":"2022-09-22T09:24:45Z"}],"abstract":[{"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.","lang":"eng"}],"publication":"Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media","editor":[{"full_name":"Kokhanovsky, Alexander","last_name":"Kokhanovsky","first_name":"Alexander"}],"volume":8,"ddc":["530"],"user_id":"158","publisher":"Springer International Publishing","_id":"33466","has_accepted_license":"1","status":"public","oa":"1","place":"Cham","project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"citation":{"ieee":"Y. Grynko, Y. Shkuratov, S. Alhaddad, and J. Förstner, “Light Scattering by Large Densely Packed Clusters of Particles,” in <i>Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media</i>, vol. 8, A. Kokhanovsky, Ed. Cham: Springer International Publishing, 2022.","apa":"Grynko, Y., Shkuratov, Y., Alhaddad, S., &#38; Förstner, J. (2022). Light Scattering by Large Densely Packed Clusters of Particles. In A. Kokhanovsky (Ed.), <i>Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media</i> (Vol. 8). Springer International Publishing. <a href=\"https://doi.org/10.1007/978-3-031-10298-1_4\">https://doi.org/10.1007/978-3-031-10298-1_4</a>","chicago":"Grynko, Yevgen, Yuriy Shkuratov, Samer Alhaddad, and Jens Förstner. “Light Scattering by Large Densely Packed Clusters of Particles.” In <i>Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media</i>, edited by Alexander Kokhanovsky, Vol. 8. Springer Series in Light Scattering. Cham: Springer International Publishing, 2022. <a href=\"https://doi.org/10.1007/978-3-031-10298-1_4\">https://doi.org/10.1007/978-3-031-10298-1_4</a>.","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.","mla":"Grynko, Yevgen, et al. “Light Scattering by Large Densely Packed Clusters of Particles.” <i>Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media</i>, edited by Alexander Kokhanovsky, vol. 8, Springer International Publishing, 2022, doi:<a href=\"https://doi.org/10.1007/978-3-031-10298-1_4\">10.1007/978-3-031-10298-1_4</a>.","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={<a href=\"https://doi.org/10.1007/978-3-031-10298-1_4\">10.1007/978-3-031-10298-1_4</a>}, 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} }","ama":"Grynko Y, Shkuratov Y, Alhaddad S, Förstner J. Light Scattering by Large Densely Packed Clusters of Particles. In: Kokhanovsky A, ed. <i>Springer Series in Light Scattering - Volume 8: Light Polarization and Multiple Scattering in Turbid Media</i>. Vol 8. Springer Series in Light Scattering. Springer International Publishing; 2022. doi:<a href=\"https://doi.org/10.1007/978-3-031-10298-1_4\">10.1007/978-3-031-10298-1_4</a>"},"file_date_updated":"2022-09-22T09:24:45Z"},{"abstract":[{"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.","lang":"eng"}],"issue":"1","publication":"Journal of the Optical Society of America B","keyword":["tet_topic_opticalantenna"],"type":"journal_article","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"file":[{"access_level":"local","file_name":"2021-12 Farheen - JOSA B - Optimization of optical nanoantennas.pdf","embargo_to":"open_access","date_created":"2021-12-08T08:26:57Z","date_updated":"2021-12-08T08:26:57Z","embargo":"2022-12-08","relation":"main_file","file_size":14029741,"content_type":"application/pdf","file_id":"28417","creator":"fossie"},{"date_updated":"2021-12-08T08:29:49Z","relation":"supplementary_material","access_level":"open_access","file_size":655495,"file_name":"2021-12 Farheen - JOSA B - Optimization of optical nanoantennas SUPPLEMENTARY MATERIAL.pdf","content_type":"application/pdf","file_id":"28418","creator":"fossie","date_created":"2021-12-08T08:29:49Z"}],"date_created":"2021-12-08T07:14:39Z","date_updated":"2024-07-22T07:45:12Z","publication_status":"published","intvolume":"        39","year":"2022","title":"Optimization of optical waveguide antennas for directive emission of light","author":[{"id":"53444","orcid":"0000-0001-7730-3489","first_name":"Henna","last_name":"Farheen","full_name":"Farheen, Henna"},{"last_name":"Leuteritz","first_name":"Till","full_name":"Leuteritz, Till"},{"full_name":"Linden, Stefan","last_name":"Linden","first_name":"Stefan"},{"last_name":"Myroshnychenko","first_name":"Viktor","full_name":"Myroshnychenko, Viktor","id":"46371"},{"orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","full_name":"Förstner, Jens","id":"158"}],"publication_identifier":{"issn":["0740-3224","1520-8540"]},"doi":"10.1364/josab.438514","language":[{"iso":"eng"}],"project":[{"name":"TRR 142","grant_number":"231447078","_id":"53"},{"_id":"56","name":"TRR 142 - Project Area C"},{"_id":"75","grant_number":"231447078","name":"TRR 142 - Subproject C5"},{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"file_date_updated":"2021-12-08T08:29:49Z","citation":{"bibtex":"@article{Farheen_Leuteritz_Linden_Myroshnychenko_Förstner_2022, title={Optimization of optical waveguide antennas for directive emission of light}, volume={39}, DOI={<a href=\"https://doi.org/10.1364/josab.438514\">10.1364/josab.438514</a>}, 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} }","ama":"Farheen H, Leuteritz T, Linden S, Myroshnychenko V, Förstner J. Optimization of optical waveguide antennas for directive emission of light. <i>Journal of the Optical Society of America B</i>. 2022;39(1):83. doi:<a href=\"https://doi.org/10.1364/josab.438514\">10.1364/josab.438514</a>","mla":"Farheen, Henna, et al. “Optimization of Optical Waveguide Antennas for Directive Emission of Light.” <i>Journal of the Optical Society of America B</i>, vol. 39, no. 1, 2022, p. 83, doi:<a href=\"https://doi.org/10.1364/josab.438514\">10.1364/josab.438514</a>.","short":"H. Farheen, T. Leuteritz, S. Linden, V. Myroshnychenko, J. Förstner, Journal of the Optical Society of America B 39 (2022) 83.","chicago":"Farheen, Henna, Till Leuteritz, Stefan Linden, Viktor Myroshnychenko, and Jens Förstner. “Optimization of Optical Waveguide Antennas for Directive Emission of Light.” <i>Journal of the Optical Society of America B</i> 39, no. 1 (2022): 83. <a href=\"https://doi.org/10.1364/josab.438514\">https://doi.org/10.1364/josab.438514</a>.","ieee":"H. Farheen, T. Leuteritz, S. Linden, V. Myroshnychenko, and J. Förstner, “Optimization of optical waveguide antennas for directive emission of light,” <i>Journal of the Optical Society of America B</i>, vol. 39, no. 1, p. 83, 2022, doi: <a href=\"https://doi.org/10.1364/josab.438514\">10.1364/josab.438514</a>.","apa":"Farheen, H., Leuteritz, T., Linden, S., Myroshnychenko, V., &#38; Förstner, J. (2022). Optimization of optical waveguide antennas for directive emission of light. <i>Journal of the Optical Society of America B</i>, <i>39</i>(1), 83. <a href=\"https://doi.org/10.1364/josab.438514\">https://doi.org/10.1364/josab.438514</a>"},"oa":"1","has_accepted_license":"1","status":"public","ddc":["530"],"user_id":"158","volume":39,"page":"83","_id":"28413"},{"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"keyword":["tet_topic_scattering"],"type":"journal_article","date_created":"2021-12-21T13:49:29Z","file":[{"embargo_to":"open_access","date_created":"2021-12-21T13:53:47Z","access_level":"local","file_name":"2022-01 Alhaddad - Optics Letter - Double Scattering.pdf","creator":"fossie","date_updated":"2021-12-21T13:53:47Z","embargo":"2022-12-21","relation":"main_file","file_size":3197213,"content_type":"application/pdf","file_id":"29076"}],"abstract":[{"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.","lang":"eng"}],"issue":"1","publication":"Optics Letters","doi":"10.1364/ol.444953","language":[{"iso":"eng"}],"intvolume":"        47","publication_status":"published","date_updated":"2024-07-22T07:45:05Z","author":[{"id":"42456","full_name":"Alhaddad, Samer","first_name":"Samer","last_name":"Alhaddad"},{"first_name":"Yevgen","last_name":"Grynko","full_name":"Grynko, Yevgen","id":"26059"},{"id":"53444","last_name":"Farheen","orcid":"0000-0001-7730-3489","first_name":"Henna","full_name":"Farheen, Henna"},{"id":"158","full_name":"Förstner, Jens","first_name":"Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner"}],"publication_identifier":{"issn":["0146-9592","1539-4794"]},"title":"Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles","year":"2022","project":[{"name":"Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"citation":{"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,” <i>Optics Letters</i>, vol. 47, no. 1, p. 58, 2022, doi: <a href=\"https://doi.org/10.1364/ol.444953\">10.1364/ol.444953</a>.","apa":"Alhaddad, S., Grynko, Y., Farheen, H., &#38; Förstner, J. (2022). Numerical analysis of the coherent mechanism producing negative polarization at backscattering from systems of absorbing particles. <i>Optics Letters</i>, <i>47</i>(1), 58. <a href=\"https://doi.org/10.1364/ol.444953\">https://doi.org/10.1364/ol.444953</a>","mla":"Alhaddad, Samer, et al. “Numerical Analysis of the Coherent Mechanism Producing Negative Polarization at Backscattering from Systems of Absorbing Particles.” <i>Optics Letters</i>, vol. 47, no. 1, 2022, p. 58, doi:<a href=\"https://doi.org/10.1364/ol.444953\">10.1364/ol.444953</a>.","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={<a href=\"https://doi.org/10.1364/ol.444953\">10.1364/ol.444953</a>}, 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.” <i>Optics Letters</i> 47, no. 1 (2022): 58. <a href=\"https://doi.org/10.1364/ol.444953\">https://doi.org/10.1364/ol.444953</a>.","short":"S. Alhaddad, Y. Grynko, H. Farheen, J. Förstner, Optics Letters 47 (2022) 58.","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. <i>Optics Letters</i>. 2022;47(1):58. doi:<a href=\"https://doi.org/10.1364/ol.444953\">10.1364/ol.444953</a>"},"file_date_updated":"2021-12-21T13:53:47Z","volume":47,"user_id":"158","ddc":["530"],"_id":"29075","page":"58","has_accepted_license":"1","status":"public"},{"doi":"10.1364/oe.455815","language":[{"iso":"eng"}],"date_updated":"2024-07-22T07:44:58Z","publication_status":"published","intvolume":"        30","year":"2022","title":"Broadband optical Ta2O5 antennas for directional emission of light","author":[{"id":"53444","orcid":"0000-0001-7730-3489","first_name":"Henna","last_name":"Farheen","full_name":"Farheen, Henna"},{"full_name":"Yan, Lok-Yee","last_name":"Yan","first_name":"Lok-Yee"},{"last_name":"Quiring","first_name":"Viktor","full_name":"Quiring, Viktor"},{"last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","full_name":"Eigner, Christof","id":"13244"},{"id":"30525","full_name":"Zentgraf, Thomas","first_name":"Thomas","last_name":"Zentgraf","orcid":"0000-0002-8662-1101"},{"full_name":"Linden, Stefan","last_name":"Linden","first_name":"Stefan"},{"last_name":"Förstner","first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","id":"158"},{"last_name":"Myroshnychenko","first_name":"Viktor","full_name":"Myroshnychenko, Viktor","id":"46371"}],"publication_identifier":{"issn":["1094-4087"]},"type":"journal_article","keyword":["tet_topic_opticalantenna"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"date_created":"2022-05-18T16:39:17Z","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."}],"issue":"11","publication":"Optics Express","user_id":"158","volume":30,"page":"19288","_id":"31329","publisher":"Optica Publishing Group","status":"public","project":[{"grant_number":"231447078","_id":"75","name":"TRR 142 - C5: TRR 142 - Subproject C5"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"citation":{"mla":"Farheen, Henna, et al. “Broadband Optical Ta2O5 Antennas for Directional Emission of Light.” <i>Optics Express</i>, vol. 30, no. 11, Optica Publishing Group, 2022, p. 19288, doi:<a href=\"https://doi.org/10.1364/oe.455815\">10.1364/oe.455815</a>.","ama":"Farheen H, Yan L-Y, Quiring V, et al. Broadband optical Ta2O5 antennas for directional emission of light. <i>Optics Express</i>. 2022;30(11):19288. doi:<a href=\"https://doi.org/10.1364/oe.455815\">10.1364/oe.455815</a>","bibtex":"@article{Farheen_Yan_Quiring_Eigner_Zentgraf_Linden_Förstner_Myroshnychenko_2022, title={Broadband optical Ta2O5 antennas for directional emission of light}, volume={30}, DOI={<a href=\"https://doi.org/10.1364/oe.455815\">10.1364/oe.455815</a>}, 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} }","apa":"Farheen, H., Yan, L.-Y., Quiring, V., Eigner, C., Zentgraf, T., Linden, S., Förstner, J., &#38; Myroshnychenko, V. (2022). Broadband optical Ta2O5 antennas for directional emission of light. <i>Optics Express</i>, <i>30</i>(11), 19288. <a href=\"https://doi.org/10.1364/oe.455815\">https://doi.org/10.1364/oe.455815</a>","ieee":"H. Farheen <i>et al.</i>, “Broadband optical Ta2O5 antennas for directional emission of light,” <i>Optics Express</i>, vol. 30, no. 11, p. 19288, 2022, doi: <a href=\"https://doi.org/10.1364/oe.455815\">10.1364/oe.455815</a>.","short":"H. Farheen, L.-Y. Yan, V. Quiring, C. Eigner, T. Zentgraf, S. Linden, J. Förstner, V. Myroshnychenko, Optics Express 30 (2022) 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.” <i>Optics Express</i> 30, no. 11 (2022): 19288. <a href=\"https://doi.org/10.1364/oe.455815\">https://doi.org/10.1364/oe.455815</a>."}},{"publication":"Integrated Optics: Devices, Materials, and Technologies XXVI","abstract":[{"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.","lang":"eng"}],"file":[{"content_type":"application/pdf","file_id":"30445","date_updated":"2022-03-22T18:05:02Z","relation":"main_file","access_level":"open_access","file_size":868473,"file_name":"2022-03 Hammer - SPIE Photonics West 2022 - Small-scale online simulations in guided-wave photonics (official version).pdf","date_created":"2022-03-22T18:05:02Z","creator":"fossie"}],"date_created":"2022-03-21T10:17:30Z","type":"conference","keyword":["tet_topic_waveguide"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"year":"2022","title":"Small-scale online simulations in guided-wave photonics","author":[{"full_name":"Hammer, Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348","first_name":"Manfred","id":"48077"}],"publication_status":"published","date_updated":"2023-04-20T10:10:55Z","language":[{"iso":"eng"}],"doi":"10.1117/12.2612208","file_date_updated":"2022-03-22T18:05:02Z","citation":{"bibtex":"@inproceedings{Hammer_2022, title={Small-scale online simulations in guided-wave photonics}, DOI={<a href=\"https://doi.org/10.1117/12.2612208\">10.1117/12.2612208</a>}, 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} }","ama":"Hammer M. Small-scale online simulations in guided-wave photonics. In: García-Blanco SM, Cheben P, eds. <i>Integrated Optics: Devices, Materials, and Technologies XXVI</i>. SPIE; 2022:1200414. doi:<a href=\"https://doi.org/10.1117/12.2612208\">10.1117/12.2612208</a>","mla":"Hammer, Manfred. “Small-Scale Online Simulations in Guided-Wave Photonics.” <i>Integrated Optics: Devices, Materials, and Technologies XXVI</i>, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2022, p. 1200414, doi:<a href=\"https://doi.org/10.1117/12.2612208\">10.1117/12.2612208</a>.","chicago":"Hammer, Manfred. “Small-Scale Online Simulations in Guided-Wave Photonics.” In <i>Integrated Optics: Devices, Materials, and Technologies XXVI</i>, edited by Sonia M. García-Blanco and Pavel Cheben, 1200414. SPIE, 2022. <a href=\"https://doi.org/10.1117/12.2612208\">https://doi.org/10.1117/12.2612208</a>.","short":"M. Hammer, in: S.M. García-Blanco, P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVI, SPIE, 2022, p. 1200414.","ieee":"M. Hammer, “Small-scale online simulations in guided-wave photonics,” in <i>Integrated Optics: Devices, Materials, and Technologies XXVI</i>, 2022, p. 1200414, doi: <a href=\"https://doi.org/10.1117/12.2612208\">10.1117/12.2612208</a>.","apa":"Hammer, M. (2022). Small-scale online simulations in guided-wave photonics. In S. M. García-Blanco &#38; P. Cheben (Eds.), <i>Integrated Optics: Devices, Materials, and Technologies XXVI</i> (p. 1200414). SPIE. <a href=\"https://doi.org/10.1117/12.2612208\">https://doi.org/10.1117/12.2612208</a>"},"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"}],"oa":"1","status":"public","has_accepted_license":"1","page":"1200414","_id":"30389","publisher":"SPIE","user_id":"158","ddc":["530"],"editor":[{"last_name":"García-Blanco","first_name":"Sonia M.","full_name":"García-Blanco, Sonia M."},{"full_name":"Cheben, Pavel","first_name":"Pavel","last_name":"Cheben"}]}]