[{"doi":"10.1088/1402-4896/ad3172","oa":"1","date_updated":"2024-03-21T10:40:51Z","language":[{"iso":"eng"}],"title":"From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops","publication_status":"published","publication_identifier":{"issn":["0031-8949","1402-4896"]},"project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"department":[{"_id":"61"},{"_id":"230"}],"issue":"4","_id":"52700","intvolume":" 99","page":"045952","type":"journal_article","citation":{"ieee":"V. Myroshnychenko, P. M. Mulavarickal Jose, H. Farheen, S. Ejaz, C. Brosseau, and J. Förstner, “From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops,” Physica Scripta, vol. 99, no. 4, p. 045952, 2024, doi: 10.1088/1402-4896/ad3172.","short":"V. Myroshnychenko, P.M. Mulavarickal Jose, H. Farheen, S. Ejaz, C. Brosseau, J. Förstner, Physica Scripta 99 (2024) 045952.","mla":"Myroshnychenko, Viktor, et al. “From Swiss-Cheese to Discrete Ferroelectric Composites: Assessing the Ferroelectric Butterfly Shape in Polarization Loops.” Physica Scripta, vol. 99, no. 4, IOP Publishing, 2024, p. 045952, doi:10.1088/1402-4896/ad3172.","bibtex":"@article{Myroshnychenko_Mulavarickal Jose_Farheen_Ejaz_Brosseau_Förstner_2024, title={From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops}, volume={99}, DOI={10.1088/1402-4896/ad3172}, number={4}, journal={Physica Scripta}, publisher={IOP Publishing}, author={Myroshnychenko, Viktor and Mulavarickal Jose, Pious Mathews and Farheen, Henna and Ejaz, Shafaq and Brosseau, Christian and Förstner, Jens}, year={2024}, pages={045952} }","apa":"Myroshnychenko, V., Mulavarickal Jose, P. M., Farheen, H., Ejaz, S., Brosseau, C., & Förstner, J. (2024). From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops. Physica Scripta, 99(4), 045952. https://doi.org/10.1088/1402-4896/ad3172","ama":"Myroshnychenko V, Mulavarickal Jose PM, Farheen H, Ejaz S, Brosseau C, Förstner J. From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops. Physica Scripta. 2024;99(4):045952. doi:10.1088/1402-4896/ad3172","chicago":"Myroshnychenko, Viktor, Pious Mathews Mulavarickal Jose, Henna Farheen, Shafaq Ejaz, Christian Brosseau, and Jens Förstner. “From Swiss-Cheese to Discrete Ferroelectric Composites: Assessing the Ferroelectric Butterfly Shape in Polarization Loops.” Physica Scripta 99, no. 4 (2024): 045952. https://doi.org/10.1088/1402-4896/ad3172."},"year":"2024","ddc":["530"],"user_id":"158","abstract":[{"text":"We explore the polarization hysteretic behaviour and field-dependent permittivity of ferroelectric-dielectric 2D materials formed by random dispersions of low permittivity inclusions in a ferroelectric matrix, using finite element simulations. We show how the degree of impenetrability of dielectric inclusions plays a substantial role in controlling the coercive field, remnant and saturation polarizations of the homogenized materials. The results highlight the significance of the degree of impenetrability of inclusion in tuning the effective polarization properties of such ferroelectric composites: coercive field drops significantly as percolation threshold is attained and remnant polarization decreases faster than a linear decay.","lang":"eng"}],"volume":99,"date_created":"2024-03-21T10:34:48Z","status":"public","has_accepted_license":"1","keyword":["tet_topic_ferro"],"file_date_updated":"2024-03-21T10:39:32Z","publication":"Physica Scripta","author":[{"first_name":"Viktor","full_name":"Myroshnychenko, Viktor","last_name":"Myroshnychenko","id":"46371"},{"first_name":"Pious Mathews","full_name":"Mulavarickal Jose, Pious Mathews","last_name":"Mulavarickal Jose"},{"last_name":"Farheen","first_name":"Henna","full_name":"Farheen, Henna"},{"first_name":"Shafaq","full_name":"Ejaz, Shafaq","last_name":"Ejaz"},{"last_name":"Brosseau","first_name":"Christian","full_name":"Brosseau, Christian"},{"last_name":"Förstner","id":"158","first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens"}],"publisher":"IOP Publishing","file":[{"access_level":"open_access","date_created":"2024-03-21T10:39:32Z","file_name":"2024-03 Myroshnychenko - Physica Scripta - From Swiss-cheese to discrete ferroelectric.pdf","content_type":"application/pdf","date_updated":"2024-03-21T10:39:32Z","relation":"main_file","file_size":5386508,"file_id":"52701","creator":"fossie"}]},{"language":[{"iso":"eng"}],"oa":"1","doi":"10.1016/j.jqsrt.2023.108557","date_updated":"2023-03-15T17:36:13Z","project":[{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"publication_identifier":{"issn":["0022-4073"]},"publication_status":"published","department":[{"_id":"61"}],"title":"Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength","type":"journal_article","year":"2023","citation":{"ieee":"S. Alhaddad, J. Förstner, and Y. Grynko, “Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength,” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 302, Art. no. 108557, 2023, doi: 10.1016/j.jqsrt.2023.108557.","short":"S. Alhaddad, J. Förstner, Y. Grynko, Journal of Quantitative Spectroscopy and Radiative Transfer 302 (2023).","bibtex":"@article{Alhaddad_Förstner_Grynko_2023, title={Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength}, volume={302}, DOI={10.1016/j.jqsrt.2023.108557}, number={108557}, journal={Journal of Quantitative Spectroscopy and Radiative Transfer}, publisher={Elsevier BV}, author={Alhaddad, Samer and Förstner, Jens and Grynko, Yevgen}, year={2023} }","mla":"Alhaddad, Samer, et al. “Numerical Study of Light Backscattering from Layers of Absorbing Irregular Particles Larger than the Wavelength.” Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 302, 108557, Elsevier BV, 2023, doi:10.1016/j.jqsrt.2023.108557.","chicago":"Alhaddad, Samer, Jens Förstner, and Yevgen Grynko. “Numerical Study of Light Backscattering from Layers of Absorbing Irregular Particles Larger than the Wavelength.” Journal of Quantitative Spectroscopy and Radiative Transfer 302 (2023). https://doi.org/10.1016/j.jqsrt.2023.108557.","ama":"Alhaddad S, Förstner J, Grynko Y. Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength. Journal of Quantitative Spectroscopy and Radiative Transfer. 2023;302. doi:10.1016/j.jqsrt.2023.108557","apa":"Alhaddad, S., Förstner, J., & Grynko, Y. (2023). Numerical study of light backscattering from layers of absorbing irregular particles larger than the wavelength. Journal of Quantitative Spectroscopy and Radiative Transfer, 302, Article 108557. https://doi.org/10.1016/j.jqsrt.2023.108557"},"article_number":"108557","_id":"43018","intvolume":" 302","date_created":"2023-03-14T12:32:54Z","status":"public","has_accepted_license":"1","volume":302,"file":[{"file_size":1508833,"creator":"fossie","file_id":"43028","date_updated":"2023-03-15T15:58:15Z","content_type":"application/pdf","relation":"main_file","date_created":"2023-03-15T15:58:15Z","file_name":"2023-03 Alhaddad - JQSRT - Numerical study of light backscattering from layers of absorbing particles larger than the wavelength.pdf","access_level":"local"},{"date_created":"2023-03-15T17:35:29Z","file_name":"2023-03 Alhaddad - JQSRT - Numerical study of light backscattering from layers of absorbing particles larger than the wavelength (accepted manuscript).pdf","access_level":"open_access","file_size":4254386,"file_id":"43029","creator":"fossie","date_updated":"2023-03-15T17:35:29Z","content_type":"application/pdf","relation":"main_file"}],"file_date_updated":"2023-03-15T17:35:29Z","publication":"Journal of Quantitative Spectroscopy and Radiative Transfer","keyword":["tet_topic_scattering"],"publisher":"Elsevier BV","author":[{"id":"42456","last_name":"Alhaddad","full_name":"Alhaddad, Samer","first_name":"Samer"},{"first_name":"Jens","full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","id":"158"},{"id":"26059","last_name":"Grynko","full_name":"Grynko, Yevgen","first_name":"Yevgen"}],"user_id":"158","ddc":["530"]},{"page":"124241E","type":"conference","citation":{"chicago":"Farheen, Henna, Lok-Yee Yan, Till Leuteritz, Siqi Qiao, Florian Spreyer, Christian Schlickriede, Viktor Quiring, et al. “Tailoring the Directive Nature of Optical Waveguide Antennas.” In Integrated Optics: Devices, Materials, and Technologies XXVII, edited by Sonia M. García-Blanco and Pavel Cheben, 124241E. SPIE, 2023. https://doi.org/10.1117/12.2658921.","apa":"Farheen, H., Yan, L.-Y., Leuteritz, T., Qiao, S., Spreyer, F., Schlickriede, C., Quiring, V., Eigner, C., Silberhorn, C., Zentgraf, T., Linden, S., Myroshnychenko, V., & Förstner, J. (2023). Tailoring the directive nature of optical waveguide antennas. In S. M. García-Blanco & P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVII (p. 124241E). SPIE. https://doi.org/10.1117/12.2658921","ama":"Farheen H, Yan L-Y, Leuteritz T, et al. Tailoring the directive nature of optical waveguide antennas. In: García-Blanco SM, Cheben P, eds. Integrated Optics: Devices, Materials, and Technologies XXVII. SPIE; 2023:124241E. doi:10.1117/12.2658921","mla":"Farheen, Henna, et al. “Tailoring the Directive Nature of Optical Waveguide Antennas.” Integrated Optics: Devices, Materials, and Technologies XXVII, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2023, p. 124241E, doi:10.1117/12.2658921.","bibtex":"@inproceedings{Farheen_Yan_Leuteritz_Qiao_Spreyer_Schlickriede_Quiring_Eigner_Silberhorn_Zentgraf_et al._2023, title={Tailoring the directive nature of optical waveguide antennas}, DOI={10.1117/12.2658921}, booktitle={Integrated Optics: Devices, Materials, and Technologies XXVII}, publisher={SPIE}, author={Farheen, Henna and Yan, Lok-Yee and Leuteritz, Till and Qiao, Siqi and Spreyer, Florian and Schlickriede, Christian and Quiring, Viktor and Eigner, Christof and Silberhorn, Christine and Zentgraf, Thomas and et al.}, editor={García-Blanco, Sonia M. and Cheben, Pavel}, year={2023}, pages={124241E} }","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 et al., “Tailoring the directive nature of optical waveguide antennas,” in Integrated Optics: Devices, Materials, and Technologies XXVII, 2023, p. 124241E, doi: 10.1117/12.2658921."},"year":"2023","_id":"43051","file":[{"access_level":"local","date_created":"2023-03-22T09:25:57Z","file_name":"2023-01 Poster Photonics West Henna OWA_A0.pdf","relation":"main_file","content_type":"application/pdf","date_updated":"2023-03-22T09:25:57Z","file_id":"43062","creator":"fossie","file_size":1426599}],"file_date_updated":"2023-03-22T09:25:57Z","publication":"Integrated Optics: Devices, Materials, and Technologies XXVII","keyword":["tet_topic_opticalantenna"],"publisher":"SPIE","author":[{"first_name":"Henna","full_name":"Farheen, Henna","last_name":"Farheen"},{"first_name":"Lok-Yee","full_name":"Yan, Lok-Yee","last_name":"Yan"},{"full_name":"Leuteritz, Till","first_name":"Till","last_name":"Leuteritz"},{"full_name":"Qiao, Siqi","first_name":"Siqi","last_name":"Qiao"},{"last_name":"Spreyer","full_name":"Spreyer, Florian","first_name":"Florian"},{"full_name":"Schlickriede, Christian","first_name":"Christian","last_name":"Schlickriede"},{"last_name":"Quiring","full_name":"Quiring, Viktor","first_name":"Viktor"},{"first_name":"Christof","full_name":"Eigner, Christof","last_name":"Eigner"},{"id":"26263","last_name":"Silberhorn","full_name":"Silberhorn, Christine","first_name":"Christine"},{"first_name":"Thomas","full_name":"Zentgraf, Thomas","orcid":"0000-0002-8662-1101","last_name":"Zentgraf","id":"30525"},{"last_name":"Linden","first_name":"Stefan","full_name":"Linden, Stefan"},{"first_name":"Viktor","full_name":"Myroshnychenko, Viktor","last_name":"Myroshnychenko","id":"46371"},{"last_name":"Förstner","id":"158","first_name":"Jens","full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862"}],"date_created":"2023-03-21T12:28:31Z","has_accepted_license":"1","status":"public","abstract":[{"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.","lang":"eng"}],"user_id":"158","ddc":["530"],"language":[{"iso":"eng"}],"date_updated":"2023-03-22T09:26:25Z","doi":"10.1117/12.2658921","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"publication_status":"published","editor":[{"last_name":"García-Blanco","first_name":"Sonia M.","full_name":"García-Blanco, Sonia M."},{"last_name":"Cheben","full_name":"Cheben, Pavel","first_name":"Pavel"}],"title":"Tailoring the directive nature of optical waveguide antennas"},{"has_accepted_license":"1","status":"public","date_created":"2023-03-21T12:35:18Z","publisher":"SPIE","author":[{"last_name":"Farheen","first_name":"Henna","full_name":"Farheen, Henna"},{"last_name":"Strauch","first_name":"Andreas","full_name":"Strauch, Andreas"},{"last_name":"Scheytt","id":"37144","first_name":"J. Christoph","orcid":"https://orcid.org/0000-0002-5950-6618","full_name":"Scheytt, J. Christoph"},{"last_name":"Myroshnychenko","id":"46371","first_name":"Viktor","full_name":"Myroshnychenko, Viktor"},{"last_name":"Förstner","id":"158","first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens"}],"publication":"Integrated Optics: Devices, Materials, and Technologies XXVII","file_date_updated":"2023-03-22T20:53:11Z","keyword":["tet_topic_opticalantenna"],"file":[{"file_size":1747396,"file_id":"43055","creator":"fossie","content_type":"application/pdf","date_updated":"2023-03-22T20:53:11Z","relation":"main_file","date_created":"2023-03-22T07:41:49Z","file_name":"2023-01 Poster Photonics West Henna OPA_A0.pdf","access_level":"request"}],"ddc":["530"],"user_id":"14931","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."}],"type":"conference","year":"2023","citation":{"ieee":"H. Farheen, A. Strauch, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Optimized silicon antennas for optical phased arrays,” in Integrated Optics: Devices, Materials, and Technologies XXVII, 2023, p. 124241D, doi: 10.1117/12.2658716.","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.","bibtex":"@inproceedings{Farheen_Strauch_Scheytt_Myroshnychenko_Förstner_2023, title={Optimized silicon antennas for optical phased arrays}, DOI={10.1117/12.2658716}, booktitle={Integrated Optics: Devices, Materials, and Technologies XXVII}, publisher={SPIE}, author={Farheen, Henna and Strauch, Andreas and Scheytt, J. Christoph and Myroshnychenko, Viktor and Förstner, Jens}, editor={García-Blanco, Sonia M. and Cheben, Pavel}, year={2023}, pages={124241D} }","mla":"Farheen, Henna, et al. “Optimized Silicon Antennas for Optical Phased Arrays.” Integrated Optics: Devices, Materials, and Technologies XXVII, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2023, p. 124241D, doi:10.1117/12.2658716.","ama":"Farheen H, Strauch A, Scheytt JC, Myroshnychenko V, Förstner J. Optimized silicon antennas for optical phased arrays. In: García-Blanco SM, Cheben P, eds. Integrated Optics: Devices, Materials, and Technologies XXVII. SPIE; 2023:124241D. doi:10.1117/12.2658716","apa":"Farheen, H., Strauch, A., Scheytt, J. C., Myroshnychenko, V., & Förstner, J. (2023). Optimized silicon antennas for optical phased arrays. In S. M. García-Blanco & P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVII (p. 124241D). SPIE. https://doi.org/10.1117/12.2658716","chicago":"Farheen, Henna, Andreas Strauch, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Optimized Silicon Antennas for Optical Phased Arrays.” In Integrated Optics: Devices, Materials, and Technologies XXVII, edited by Sonia M. García-Blanco and Pavel Cheben, 124241D. SPIE, 2023. https://doi.org/10.1117/12.2658716."},"page":"124241D ","_id":"43052","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"}],"publication_status":"published","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"title":"Optimized silicon antennas for optical phased arrays","language":[{"iso":"eng"}],"doi":"10.1117/12.2658716","date_updated":"2023-03-22T20:53:50Z"},{"page":"862","citation":{"ieee":"M. Hammer, H. Farheen, and J. Förstner, “How to suppress radiative losses in high-contrast integrated Bragg gratings,” Journal of the Optical Society of America B, vol. 40, no. 4, p. 862, 2023, doi: 10.1364/josab.485725.","short":"M. Hammer, H. Farheen, J. Förstner, Journal of the Optical Society of America B 40 (2023) 862.","bibtex":"@article{Hammer_Farheen_Förstner_2023, title={How to suppress radiative losses in high-contrast integrated Bragg gratings}, volume={40}, DOI={10.1364/josab.485725}, number={4}, journal={Journal of the Optical Society of America B}, publisher={Optica Publishing Group}, author={Hammer, Manfred and Farheen, Henna and Förstner, Jens}, year={2023}, pages={862} }","mla":"Hammer, Manfred, et al. “How to Suppress Radiative Losses in High-Contrast Integrated Bragg Gratings.” Journal of the Optical Society of America B, vol. 40, no. 4, Optica Publishing Group, 2023, p. 862, doi:10.1364/josab.485725.","apa":"Hammer, M., Farheen, H., & Förstner, J. (2023). How to suppress radiative losses in high-contrast integrated Bragg gratings. Journal of the Optical Society of America B, 40(4), 862. https://doi.org/10.1364/josab.485725","ama":"Hammer M, Farheen H, Förstner J. How to suppress radiative losses in high-contrast integrated Bragg gratings. Journal of the Optical Society of America B. 2023;40(4):862. doi:10.1364/josab.485725","chicago":"Hammer, Manfred, Henna Farheen, and Jens Förstner. “How to Suppress Radiative Losses in High-Contrast Integrated Bragg Gratings.” Journal of the Optical Society of America B 40, no. 4 (2023): 862. https://doi.org/10.1364/josab.485725."},"year":"2023","type":"journal_article","intvolume":" 40","_id":"43245","issue":"4","file":[{"file_name":"ogr-afterreview.pdf","date_created":"2023-03-31T13:14:59Z","access_level":"open_access","creator":"fossie","file_id":"43247","file_size":1982311,"relation":"main_file","date_updated":"2023-03-31T13:14:59Z","content_type":"application/pdf"}],"publication":"Journal of the Optical Society of America B","keyword":["tet_topic_waveguide"],"file_date_updated":"2023-03-31T13:14:59Z","publisher":"Optica Publishing Group","author":[{"id":"48077","last_name":"Hammer","orcid":"0000-0002-6331-9348","full_name":"Hammer, Manfred","first_name":"Manfred"},{"full_name":"Farheen, Henna","first_name":"Henna","last_name":"Farheen"},{"orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","first_name":"Jens","id":"158","last_name":"Förstner"}],"date_created":"2023-03-31T13:04:43Z","has_accepted_license":"1","status":"public","volume":40,"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"}],"user_id":"158","ddc":["530"],"language":[{"iso":"eng"}],"date_updated":"2023-04-20T10:03:40Z","oa":"1","doi":"10.1364/josab.485725","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"project":[{"_id":"53","name":"TRR 142: TRR 142"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"_id":"167","name":"TRR 142 - B06: TRR 142 - Subproject B06"}],"publication_status":"published","publication_identifier":{"issn":["0740-3224","1520-8540"]},"title":"How to suppress radiative losses in high-contrast integrated Bragg gratings"},{"citation":{"ieee":"D. Hähnel et al., “A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces,” Light: Science & Applications, vol. 12, no. 1, p. 97, 2023, doi: https://doi.org/10.1038/s41377-023-01134-1.","short":"D. Hähnel, C. Golla, M. Albert, T. Zentgraf, V. Myroshnychenko, J. Förstner, C. Meier, Light: Science & Applications 12 (2023) 97.","mla":"Hähnel, David, et al. “A Multi-Mode Super-Fano Mechanism for Enhanced Third Harmonic Generation in Silicon Metasurfaces.” Light: Science & Applications, vol. 12, no. 1, Springer Nature, 2023, p. 97, doi:https://doi.org/10.1038/s41377-023-01134-1.","bibtex":"@article{Hähnel_Golla_Albert_Zentgraf_Myroshnychenko_Förstner_Meier_2023, title={A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces}, volume={12}, DOI={https://doi.org/10.1038/s41377-023-01134-1}, number={1}, journal={Light: Science & Applications}, publisher={Springer Nature}, author={Hähnel, David and Golla, Christian and Albert, Maximilian and Zentgraf, Thomas and Myroshnychenko, Viktor and Förstner, Jens and Meier, Cedrik}, year={2023}, pages={97} }","chicago":"Hähnel, David, Christian Golla, Maximilian Albert, Thomas Zentgraf, Viktor Myroshnychenko, Jens Förstner, and Cedrik Meier. “A Multi-Mode Super-Fano Mechanism for Enhanced Third Harmonic Generation in Silicon Metasurfaces.” Light: Science & Applications 12, no. 1 (2023): 97. https://doi.org/10.1038/s41377-023-01134-1.","ama":"Hähnel D, Golla C, Albert M, et al. A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. Light: Science & Applications. 2023;12(1):97. doi:https://doi.org/10.1038/s41377-023-01134-1","apa":"Hähnel, D., Golla, C., Albert, M., Zentgraf, T., Myroshnychenko, V., Förstner, J., & Meier, C. (2023). A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. Light: Science & Applications, 12(1), 97. https://doi.org/10.1038/s41377-023-01134-1"},"year":"2023","type":"journal_article","page":"97","issue":"1","intvolume":" 12","_id":"44097","volume":12,"status":"public","has_accepted_license":"1","date_created":"2023-04-21T09:45:07Z","quality_controlled":"1","author":[{"first_name":"David","full_name":"Hähnel, David","last_name":"Hähnel"},{"full_name":"Golla, Christian","first_name":"Christian","last_name":"Golla"},{"full_name":"Albert, Maximilian","first_name":"Maximilian","last_name":"Albert"},{"orcid":"0000-0002-8662-1101","full_name":"Zentgraf, Thomas","first_name":"Thomas","id":"30525","last_name":"Zentgraf"},{"id":"46371","last_name":"Myroshnychenko","full_name":"Myroshnychenko, Viktor","first_name":"Viktor"},{"last_name":"Förstner","id":"158","first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens"},{"first_name":"Cedrik","full_name":"Meier, Cedrik","orcid":"https://orcid.org/0000-0002-3787-3572","last_name":"Meier","id":"20798"}],"publisher":"Springer Nature","publication":"Light: Science & Applications","keyword":["tet_topic_meta"],"file_date_updated":"2023-04-21T10:03:30Z","file":[{"access_level":"open_access","date_created":"2023-04-21T10:00:27Z","file_name":"2023-04 Hähnel - LSA - Multimode Fano THG.pdf","content_type":"application/pdf","date_updated":"2023-04-21T10:00:27Z","relation":"main_file","file_size":2088874,"file_id":"44098","creator":"fossie"},{"access_level":"open_access","date_created":"2023-04-21T10:03:30Z","file_name":"2023-04 Hähnel - LSA - Multimode Fano THG (supplementary information).pdf","relation":"supplementary_material","content_type":"application/pdf","date_updated":"2023-04-21T10:03:30Z","file_id":"44099","creator":"fossie","file_size":986743}],"ddc":["530"],"user_id":"158","article_type":"original","abstract":[{"lang":"eng","text":"We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These ‘Super-Fano’ resonances are investigated numerically in great detail using full-wave simulations. The theoretically predicted behavior of the metasurface is experimentally verified by linear and nonlinear transmission spectroscopy. Moreover, quantitative nonlinear measurements are performed, in which an absolute conversion efficiency as high as ηmax ≈ 2.8 × 10−7 a peak power intensity of 1.2 GW cm−2 is found. Compared to an unpatterned silicon film of the same thickness amplification factors of up to ~900 are demonstrated. Our results pave the way to exploiting a strong Fano-type multi-mode coupling in metasurfaces for high THG in potential applications."}],"language":[{"iso":"eng"}],"doi":"https://doi.org/10.1038/s41377-023-01134-1","oa":"1","date_updated":"2023-04-21T10:04:05Z","publication_status":"published","publication_identifier":{"issn":["2047-7538"]},"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"title":"A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces"},{"keyword":["tet_topic_meta"],"publication":"ACS Photonics","file_date_updated":"2023-06-13T09:48:17Z","publisher":"American Chemical Society (ACS)","author":[{"full_name":"Hähnel, David","first_name":"David","last_name":"Hähnel"},{"full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","first_name":"Jens","id":"158","last_name":"Förstner"},{"last_name":"Myroshnychenko","id":"46371","first_name":"Viktor","full_name":"Myroshnychenko, Viktor"}],"file":[{"creator":"fossie","file_id":"45597","file_size":5382111,"relation":"main_file","date_updated":"2023-06-13T09:48:17Z","content_type":"application/pdf","file_name":"2023-06 Hähnel - ACS Photonics - Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.pdf","date_created":"2023-06-13T09:48:17Z","access_level":"open_access"}],"date_created":"2023-06-13T09:43:25Z","status":"public","has_accepted_license":"1","abstract":[{"lang":"eng","text":"Dielectric metasurfaces provide a unique platform for efficient harmonic generation and optical wavefront manipulation at the nanoscale. Tailoring phase and amplitude of a nonlinearly generated wave with a high emission efficiency using resonance-based metasurfaces is a challenging task that often requires state-of-the-art numerical methods. Here, we propose a simple yet effective approach combining a sampling method with a Monte Carlo approach to design the third-harmonic wavefront generated by all-dielectric metasurfaces composed of elliptical silicon nanodisks. Using this approach, we theoretically demonstrate the full nonlinear 2π phase control with a uniform and highest possible amplitude in the considered parameter space, allowing us to design metasurfaces operating as third harmonic beam deflectors capable of steering light into a desired direction with high emission efficiency. The TH beam deflection with a record calculated average conversion efficiency of 1.2 × 10–1 W–2 is achieved. We anticipate that the proposed approach will be widely applied as alternative to commonly used optimization algorithms with higher complexity and implementation effort for the design of metasurfaces with other holographic functionalities."}],"ddc":["530"],"user_id":"158","main_file_link":[{"open_access":"1"}],"citation":{"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,” ACS Photonics, 2023, doi: 10.1021/acsphotonics.2c01967.","ama":"Hähnel D, Förstner J, Myroshnychenko V. Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces. ACS Photonics. Published online 2023. doi:10.1021/acsphotonics.2c01967","apa":"Hähnel, D., Förstner, J., & Myroshnychenko, V. (2023). Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces. ACS Photonics. https://doi.org/10.1021/acsphotonics.2c01967","chicago":"Hähnel, David, Jens Förstner, and Viktor Myroshnychenko. “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.” ACS Photonics, 2023. https://doi.org/10.1021/acsphotonics.2c01967.","mla":"Hähnel, David, et al. “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.” ACS Photonics, American Chemical Society (ACS), 2023, doi:10.1021/acsphotonics.2c01967.","bibtex":"@article{Hähnel_Förstner_Myroshnychenko_2023, title={Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces}, DOI={10.1021/acsphotonics.2c01967}, journal={ACS Photonics}, publisher={American Chemical Society (ACS)}, author={Hähnel, David and Förstner, Jens and Myroshnychenko, Viktor}, year={2023} }"},"year":"2023","type":"journal_article","_id":"45596","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"publication_identifier":{"issn":["2330-4022","2330-4022"]},"publication_status":"published","project":[{"_id":"167","grant_number":"231447078","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"},{"grant_number":"231447078","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"_id":"75","grant_number":"231447078","name":"TRR 142 - C05: TRR 142 - Nichtlineare optische Oberflächen basierend auf ZnO-plasmonischen Hybrid-Nanostrukturen (C05)"},{"_id":"56","name":"TRR 142 - C: TRR 142 - Project Area C"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"title":"Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces","language":[{"iso":"eng"}],"date_updated":"2023-06-13T09:49:12Z","doi":"10.1021/acsphotonics.2c01967","oa":"1"},{"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"}],"user_id":"158","ddc":["530"],"file":[{"date_created":"2023-12-21T09:34:17Z","file_name":"2ß23-12 Farheen - PNFA - Optimized, highly efficient silicon antennas for optical phased arrays.pdf","access_level":"open_access","file_size":3339442,"creator":"fossie","file_id":"50013","content_type":"application/pdf","date_updated":"2023-12-21T09:34:17Z","relation":"main_file"}],"publisher":"Elsevier BV","author":[{"full_name":"Farheen, Henna","first_name":"Henna","last_name":"Farheen"},{"first_name":"Andreas","full_name":"Strauch, Andreas","last_name":"Strauch"},{"last_name":"Scheytt","id":"37144","first_name":"J. Christoph","orcid":"0000-0002-5950-6618 ","full_name":"Scheytt, J. Christoph"},{"last_name":"Myroshnychenko","id":"46371","first_name":"Viktor","full_name":"Myroshnychenko, Viktor"},{"last_name":"Förstner","id":"158","first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens"}],"keyword":["tet_topic_opticalantenna"],"file_date_updated":"2023-12-21T09:34:17Z","publication":"Photonics and Nanostructures - Fundamentals and Applications","has_accepted_license":"1","status":"public","date_created":"2023-12-21T09:30:03Z","volume":58,"_id":"50012","intvolume":" 58","year":"2023","citation":{"short":"H. Farheen, A. Strauch, J.C. Scheytt, V. Myroshnychenko, J. Förstner, Photonics and Nanostructures - Fundamentals and Applications 58 (2023) 101207.","ieee":"H. Farheen, A. Strauch, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays,” Photonics and Nanostructures - Fundamentals and Applications, vol. 58, p. 101207, 2023, doi: 10.1016/j.photonics.2023.101207.","ama":"Farheen H, Strauch A, Scheytt JC, Myroshnychenko V, Förstner J. Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays. Photonics and Nanostructures - Fundamentals and Applications. 2023;58:101207. doi:10.1016/j.photonics.2023.101207","apa":"Farheen, H., Strauch, A., Scheytt, J. C., Myroshnychenko, V., & Förstner, J. (2023). Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays. Photonics and Nanostructures - Fundamentals and Applications, 58, 101207. https://doi.org/10.1016/j.photonics.2023.101207","chicago":"Farheen, Henna, Andreas Strauch, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays.” Photonics and Nanostructures - Fundamentals and Applications 58 (2023): 101207. https://doi.org/10.1016/j.photonics.2023.101207.","bibtex":"@article{Farheen_Strauch_Scheytt_Myroshnychenko_Förstner_2023, title={Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays}, volume={58}, DOI={10.1016/j.photonics.2023.101207}, journal={Photonics and Nanostructures - Fundamentals and Applications}, publisher={Elsevier BV}, author={Farheen, Henna and Strauch, Andreas and Scheytt, J. Christoph and Myroshnychenko, Viktor and Förstner, Jens}, year={2023}, pages={101207} }","mla":"Farheen, Henna, et al. “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays.” Photonics and Nanostructures - Fundamentals and Applications, vol. 58, Elsevier BV, 2023, p. 101207, doi:10.1016/j.photonics.2023.101207."},"type":"journal_article","page":"101207","related_material":{"link":[{"url":"https://doi.org/10.5281/zenodo.10044122","relation":"research_data"}]},"title":"Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"58"}],"project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","grant_number":"PROFILNRW-2020-067","_id":"266"},{"_id":"167","grant_number":"231447078","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)"},{"_id":"55","name":"TRR 142 - B: TRR 142 - Project Area B"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"publication_identifier":{"issn":["1569-4410"]},"publication_status":"published","date_updated":"2023-12-21T09:48:39Z","oa":"1","doi":"10.1016/j.photonics.2023.101207","language":[{"iso":"eng"}]},{"place":"Genoa, Italy ","title":"Characterization of Various Environmental Influences on the Inductive Localization","department":[{"_id":"59"},{"_id":"61"},{"_id":"485"}],"publication_status":"published","publication_identifier":{"eisbn":["979-8-3503-2304-7"]},"date_updated":"2023-12-21T09:51:11Z","doi":"10.1109/cama57522.2023.10352780","language":[{"iso":"eng"}],"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."}],"user_id":"158","publication":"2023 IEEE Conference on Antenna Measurements and Applications (CAMA)","keyword":["Planar coils","inductive locating","magnetic fields","environmental influences","eddy currents","tet_topic_hf"],"publisher":"IEEE","author":[{"last_name":"Lange","id":"38240","first_name":"Sven","full_name":"Lange, Sven"},{"id":"20179","last_name":"Hilleringmann","full_name":"Hilleringmann, Ulrich","first_name":"Ulrich"},{"first_name":"Christian","full_name":"Hedayat, Christian","last_name":"Hedayat"},{"last_name":"Kuhn","first_name":"Harald","full_name":"Kuhn, Harald"},{"first_name":"Jens","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","last_name":"Förstner","id":"158"}],"date_created":"2023-12-20T08:36:58Z","status":"public","conference":{"start_date":"2023-11-15","name":"2023 IEEE Conference on Antenna Measurements and Applications (CAMA)","location":"Genoa, Italy ","end_date":"2023-11-17"},"_id":"49890","main_file_link":[{"url":"https://ieeexplore.ieee.org/document/10352780"}],"year":"2023","citation":{"apa":"Lange, S., Hilleringmann, U., Hedayat, C., Kuhn, H., & Förstner, J. (2023). Characterization of Various Environmental Influences on the Inductive Localization. 2023 IEEE Conference on Antenna Measurements and Applications (CAMA). 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), Genoa, Italy . https://doi.org/10.1109/cama57522.2023.10352780","ama":"Lange S, Hilleringmann U, Hedayat C, Kuhn H, Förstner J. Characterization of Various Environmental Influences on the Inductive Localization. In: 2023 IEEE Conference on Antenna Measurements and Applications (CAMA). IEEE; 2023. doi:10.1109/cama57522.2023.10352780","chicago":"Lange, Sven, Ulrich Hilleringmann, Christian Hedayat, Harald Kuhn, and Jens Förstner. “Characterization of Various Environmental Influences on the Inductive Localization.” In 2023 IEEE Conference on Antenna Measurements and Applications (CAMA). Genoa, Italy : IEEE, 2023. https://doi.org/10.1109/cama57522.2023.10352780.","bibtex":"@inproceedings{Lange_Hilleringmann_Hedayat_Kuhn_Förstner_2023, place={Genoa, Italy }, title={Characterization of Various Environmental Influences on the Inductive Localization}, DOI={10.1109/cama57522.2023.10352780}, booktitle={2023 IEEE Conference on Antenna Measurements and Applications (CAMA)}, publisher={IEEE}, author={Lange, Sven and Hilleringmann, Ulrich and Hedayat, Christian and Kuhn, Harald and Förstner, Jens}, year={2023} }","mla":"Lange, Sven, et al. “Characterization of Various Environmental Influences on the Inductive Localization.” 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), IEEE, 2023, doi:10.1109/cama57522.2023.10352780.","short":"S. Lange, U. Hilleringmann, C. Hedayat, H. Kuhn, J. Förstner, in: 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), IEEE, Genoa, Italy , 2023.","ieee":"S. Lange, U. Hilleringmann, C. Hedayat, H. Kuhn, and J. Förstner, “Characterization of Various Environmental Influences on the Inductive Localization,” presented at the 2023 IEEE Conference on Antenna Measurements and Applications (CAMA), Genoa, Italy , 2023, doi: 10.1109/cama57522.2023.10352780."},"type":"conference"},{"language":[{"iso":"eng"}],"date_updated":"2023-12-21T10:41:17Z","doi":"10.1002/qute.202300142","oa":"1","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"publication_status":"published","publication_identifier":{"issn":["2511-9044","2511-9044"]},"project":[{"_id":"173","name":"TRR 142 - C09: TRR 142 - Ideale Erzeugung von Photonenpaaren für Verschränkungsaustausch bei Telekom Wellenlängen (C09*)","grant_number":"231447078"},{"_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)","grant_number":"231447078"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"title":"On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs","related_material":{"record":[{"id":"43246","status":"public","relation":"earlier_version"}]},"main_file_link":[{"open_access":"1","url":"https://onlinelibrary.wiley.com/doi/10.1002/qute.202300142"}],"citation":{"short":"D. Bauch, D. Siebert, K. Jöns, J. Förstner, S. Schumacher, Advanced Quantum Technologies (2023).","ieee":"D. Bauch, D. Siebert, K. Jöns, J. Förstner, and S. Schumacher, “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs,” Advanced Quantum Technologies, 2023, doi: 10.1002/qute.202300142.","chicago":"Bauch, David, Dustin Siebert, Klaus Jöns, Jens Förstner, and Stefan Schumacher. “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs.” Advanced Quantum Technologies, 2023. https://doi.org/10.1002/qute.202300142.","apa":"Bauch, D., Siebert, D., Jöns, K., Förstner, J., & Schumacher, S. (2023). On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs. Advanced Quantum Technologies. https://doi.org/10.1002/qute.202300142","ama":"Bauch D, Siebert D, Jöns K, Förstner J, Schumacher S. On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs. Advanced Quantum Technologies. Published online 2023. doi:10.1002/qute.202300142","bibtex":"@article{Bauch_Siebert_Jöns_Förstner_Schumacher_2023, title={On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs}, DOI={10.1002/qute.202300142}, journal={Advanced Quantum Technologies}, publisher={Wiley}, author={Bauch, David and Siebert, Dustin and Jöns, Klaus and Förstner, Jens and Schumacher, Stefan}, year={2023} }","mla":"Bauch, David, et al. “On‐Demand Indistinguishable and Entangled Photons Using Tailored Cavity Designs.” Advanced Quantum Technologies, Wiley, 2023, doi:10.1002/qute.202300142."},"year":"2023","type":"journal_article","_id":"48599","publisher":"Wiley","author":[{"last_name":"Bauch","first_name":"David","full_name":"Bauch, David"},{"first_name":"Dustin","full_name":"Siebert, Dustin","last_name":"Siebert"},{"full_name":"Jöns, Klaus","first_name":"Klaus","id":"85353","last_name":"Jöns"},{"orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","first_name":"Jens","id":"158","last_name":"Förstner"},{"first_name":"Stefan","orcid":"0000-0003-4042-4951","full_name":"Schumacher, Stefan","last_name":"Schumacher","id":"27271"}],"keyword":["tet_topic_qd"],"publication":"Advanced Quantum Technologies","status":"public","date_created":"2023-11-03T10:07:38Z","abstract":[{"text":"AbstractThe biexciton‐exciton emission cascade commonly used in quantum‐dot systems to generate polarization entanglement yields photons with intrinsically limited indistinguishability. In the present work, it focuses on the generation of pairs of photons with high degrees of polarization entanglement and simultaneously high indistinguishability. It achieves this goal by selectively reducing the biexciton lifetime with an optical resonator. It demonstrates that a suitably tailored circular Bragg reflector fulfills the requirements of sufficient selective Purcell enhancement of biexciton emission paired with spectrally broad photon extraction and twofold degenerate optical modes. The in‐depth theoretical study combines (i) the optimization of realistic photonic structures solving Maxwell's equations from which model parameters are extracted as input for (ii) microscopic simulations of quantum‐dot cavity excitation dynamics with full access to photon properties. It reports non‐trivial dependencies on system parameters and use the predictive power of the combined theoretical approach to determine the optimal range of Purcell enhancement that maximizes indistinguishability and entanglement to near unity values, here specifically for the telecom C‐band at 1550 nm.","lang":"eng"}],"user_id":"158"}]