[{"date_created":"2025-08-06T09:36:30Z","file":[{"file_id":"61516","content_type":"application/pdf","success":1,"file_name":"2025-08 Hammer - Optics Continuum - TFLN channel waveguides of rib and strip type. Properties of guided modes (official version).pdf","access_level":"closed","file_size":5417636,"relation":"main_file","date_updated":"2025-10-05T11:48:25Z","date_created":"2025-10-05T11:48:25Z","creator":"fossie"}],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"type":"journal_article","keyword":["tet_topic_waveguide"],"publication":"Optics Continuum","issue":"10","abstract":[{"text":"Straight dielectric waveguide channels made from slabs of thin-film lithium niobate (TFLN), or lithium niobate on insulator (LNOI), are investigated in the linear regime, for channels of rib and strip type with common trapezoidal cross sections, in Z-cut and X-cut samples at varying on-chip orientation. We clarify the theoretical basis for the waveguides with potentially non-diagonal core permittivity. Symmetry classes can be distinguished that differ in their consequences for potential modal degeneracy and polarization conversion. Our rigorous numerical analysis by means of a finite-element solver takes the anisotropy of the lithium niobate cores rigorously into account. We discuss extensive data for effective indices, polarization properties, and hybridization of guided modes, in single- and multimode channels. Scans over the waveguide width and orientation as primary parameters are complemented by a series of illustrations of vectorial mode profiles. These turn out to be essentially complex in cases of X-cut channels at non-crystal-axis-aligned orientations.","lang":"eng"}],"language":[{"iso":"eng"}],"doi":"10.1364/optcon.569959","publication_identifier":{"issn":["2770-0208"]},"author":[{"full_name":"Hammer, Manfred","last_name":"Hammer","first_name":"Manfred","orcid":"0000-0002-6331-9348","id":"48077"},{"last_name":"Khan","first_name":"Shahriar","full_name":"Khan, Shahriar"},{"first_name":"Behnood","last_name":"Taheri","full_name":"Taheri, Behnood"},{"last_name":"Farheen","first_name":"Henna","orcid":"0000-0001-7730-3489","full_name":"Farheen, Henna","id":"53444"},{"id":"158","last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens","full_name":"Förstner, Jens"}],"year":"2025","title":"TFLN channel waveguides of rib and strip type: Properties of guided modes","intvolume":"         4","publication_status":"published","date_updated":"2025-10-05T11:52:55Z","citation":{"mla":"Hammer, Manfred, et al. “TFLN Channel Waveguides of Rib and Strip Type: Properties of Guided Modes.” <i>Optics Continuum</i>, vol. 4, no. 10, Optica Publishing Group, 2025, p. 2356, doi:<a href=\"https://doi.org/10.1364/optcon.569959\">10.1364/optcon.569959</a>.","ama":"Hammer M, Khan S, Taheri B, Farheen H, Förstner J. TFLN channel waveguides of rib and strip type: Properties of guided modes. <i>Optics Continuum</i>. 2025;4(10):2356. doi:<a href=\"https://doi.org/10.1364/optcon.569959\">10.1364/optcon.569959</a>","bibtex":"@article{Hammer_Khan_Taheri_Farheen_Förstner_2025, title={TFLN channel waveguides of rib and strip type: Properties of guided modes}, volume={4}, DOI={<a href=\"https://doi.org/10.1364/optcon.569959\">10.1364/optcon.569959</a>}, number={10}, journal={Optics Continuum}, publisher={Optica Publishing Group}, author={Hammer, Manfred and Khan, Shahriar and Taheri, Behnood and Farheen, Henna and Förstner, Jens}, year={2025}, pages={2356} }","apa":"Hammer, M., Khan, S., Taheri, B., Farheen, H., &#38; Förstner, J. (2025). TFLN channel waveguides of rib and strip type: Properties of guided modes. <i>Optics Continuum</i>, <i>4</i>(10), 2356. <a href=\"https://doi.org/10.1364/optcon.569959\">https://doi.org/10.1364/optcon.569959</a>","ieee":"M. Hammer, S. Khan, B. Taheri, H. Farheen, and J. Förstner, “TFLN channel waveguides of rib and strip type: Properties of guided modes,” <i>Optics Continuum</i>, vol. 4, no. 10, p. 2356, 2025, doi: <a href=\"https://doi.org/10.1364/optcon.569959\">10.1364/optcon.569959</a>.","chicago":"Hammer, Manfred, Shahriar Khan, Behnood Taheri, Henna Farheen, and Jens Förstner. “TFLN Channel Waveguides of Rib and Strip Type: Properties of Guided Modes.” <i>Optics Continuum</i> 4, no. 10 (2025): 2356. <a href=\"https://doi.org/10.1364/optcon.569959\">https://doi.org/10.1364/optcon.569959</a>.","short":"M. Hammer, S. Khan, B. Taheri, H. Farheen, J. Förstner, Optics Continuum 4 (2025) 2356."},"file_date_updated":"2025-10-05T11:48:25Z","_id":"60891","publisher":"Optica Publishing Group","page":"2356","volume":4,"user_id":"158","ddc":["530"],"status":"public","has_accepted_license":"1"},{"publication_status":"published","date_updated":"2025-10-08T15:22:30Z","author":[{"first_name":"Henna","last_name":"Farheen","orcid":"0000-0001-7730-3489","full_name":"Farheen, Henna","id":"53444"},{"full_name":"Chen, Yuheng","first_name":"Yuheng","last_name":"Chen"},{"full_name":"Chen, Peigang","last_name":"Chen","first_name":"Peigang"},{"last_name":"Kryvobok","first_name":"Artem","full_name":"Kryvobok, Artem"},{"last_name":"Peana","first_name":"Samuel","full_name":"Peana, Samuel"},{"last_name":"Senichev","first_name":"Alexander","full_name":"Senichev, Alexander"},{"first_name":"Vladimir M.","last_name":"Shalaev","full_name":"Shalaev, Vladimir M."},{"full_name":"Boltasseva, Alexandra","last_name":"Boltasseva","first_name":"Alexandra"},{"id":"158","full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner"},{"full_name":"Kildishev, Alexander V.","first_name":"Alexander V.","last_name":"Kildishev"}],"year":"2025","status":"public","title":"Topology-optimized silicon nitride coupler for integrated single-photon emitters","editor":[{"first_name":"Xingjie","last_name":"Ni","full_name":"Ni, Xingjie"},{"full_name":"Cai, Wenshan","last_name":"Cai","first_name":"Wenshan"}],"user_id":"158","doi":"10.1117/12.3065734","publisher":"SPIE","_id":"61760","language":[{"iso":"eng"}],"abstract":[{"text":"We present a topology-optimized silicon nitride (Si3N4) coupler designed to enhance the coupling efficiency between integrated single-photon emitters and photonic waveguide modes. By leveraging inverse design techniques, we optimize the coupler’s geometry to maximize power transfer while maintaining fabrication feasibility by improving mode overlap and directional emission, addressing the challenge of low coupling efficiency caused by size mismatch and material incompatibility. Simulations demonstrate a substantial enhancement in photon extraction and waveguide coupling. This approach can be extended to other photonic devices, offering a versatile framework for improving quantum light-matter interactions in integrated photonics.","lang":"eng"}],"citation":{"mla":"Farheen, Henna, et al. “Topology-Optimized Silicon Nitride Coupler for Integrated Single-Photon Emitters.” <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>, edited by Xingjie Ni and Wenshan Cai, SPIE, 2025, doi:<a href=\"https://doi.org/10.1117/12.3065734\">10.1117/12.3065734</a>.","bibtex":"@inproceedings{Farheen_Chen_Chen_Kryvobok_Peana_Senichev_Shalaev_Boltasseva_Förstner_Kildishev_2025, title={Topology-optimized silicon nitride coupler for integrated single-photon emitters}, DOI={<a href=\"https://doi.org/10.1117/12.3065734\">10.1117/12.3065734</a>}, booktitle={Photonic Computing: From Materials and Devices to Systems and Applications II}, publisher={SPIE}, author={Farheen, Henna and Chen, Yuheng and Chen, Peigang and Kryvobok, Artem and Peana, Samuel and Senichev, Alexander and Shalaev, Vladimir M. and Boltasseva, Alexandra and Förstner, Jens and Kildishev, Alexander V.}, editor={Ni, Xingjie and Cai, Wenshan}, year={2025} }","ama":"Farheen H, Chen Y, Chen P, et al. Topology-optimized silicon nitride coupler for integrated single-photon emitters. In: Ni X, Cai W, eds. <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>. SPIE; 2025. doi:<a href=\"https://doi.org/10.1117/12.3065734\">10.1117/12.3065734</a>","ieee":"H. Farheen <i>et al.</i>, “Topology-optimized silicon nitride coupler for integrated single-photon emitters,” in <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>, 2025, doi: <a href=\"https://doi.org/10.1117/12.3065734\">10.1117/12.3065734</a>.","apa":"Farheen, H., Chen, Y., Chen, P., Kryvobok, A., Peana, S., Senichev, A., Shalaev, V. M., Boltasseva, A., Förstner, J., &#38; Kildishev, A. V. (2025). Topology-optimized silicon nitride coupler for integrated single-photon emitters. In X. Ni &#38; W. Cai (Eds.), <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>. SPIE. <a href=\"https://doi.org/10.1117/12.3065734\">https://doi.org/10.1117/12.3065734</a>","short":"H. Farheen, Y. Chen, P. Chen, A. Kryvobok, S. Peana, A. Senichev, V.M. Shalaev, A. Boltasseva, J. Förstner, A.V. Kildishev, in: X. Ni, W. Cai (Eds.), Photonic Computing: From Materials and Devices to Systems and Applications II, SPIE, 2025.","chicago":"Farheen, Henna, Yuheng Chen, Peigang Chen, Artem Kryvobok, Samuel Peana, Alexander Senichev, Vladimir M. Shalaev, Alexandra Boltasseva, Jens Förstner, and Alexander V. Kildishev. “Topology-Optimized Silicon Nitride Coupler for Integrated Single-Photon Emitters.” In <i>Photonic Computing: From Materials and Devices to Systems and Applications II</i>, edited by Xingjie Ni and Wenshan Cai. SPIE, 2025. <a href=\"https://doi.org/10.1117/12.3065734\">https://doi.org/10.1117/12.3065734</a>."},"publication":"Photonic Computing: From Materials and Devices to Systems and Applications II","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"keyword":["tet_topic_waveguide"],"type":"conference","date_created":"2025-10-08T15:20:13Z"},{"user_id":"158","ddc":["530"],"volume":32,"page":"22878","publisher":"Optica Publishing Group","_id":"54668","has_accepted_license":"1","status":"public","oa":"1","project":[{"grant_number":"231447078","_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"},{"name":"TRR 142 - C11: TRR 142 - Kompakte Photonenpaar-Quelle mit ultraschnellen Modulatoren auf Basis von CMOS und LNOI (C11*)","grant_number":"231447078","_id":"175"},{"grant_number":"231447078","_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)"},{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266","grant_number":"PROFILNRW-2020-067"}],"file_date_updated":"2024-06-10T11:25:00Z","citation":{"chicago":"Hammer, Manfred, Silia Babel, Henna Farheen, Laura Padberg, J. Christoph Scheytt, Christine Silberhorn, and Jens Förstner. “Estimation of Losses Caused by Sidewall Roughness in Thin-Film Lithium Niobate Rib and Strip Waveguides.” <i>Optics Express</i> 32, no. 13 (2024): 22878. <a href=\"https://doi.org/10.1364/oe.521766\">https://doi.org/10.1364/oe.521766</a>.","short":"M. Hammer, S. Babel, H. Farheen, L. Padberg, J.C. Scheytt, C. Silberhorn, J. Förstner, Optics Express 32 (2024) 22878.","ieee":"M. Hammer <i>et al.</i>, “Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides,” <i>Optics Express</i>, vol. 32, no. 13, p. 22878, 2024, doi: <a href=\"https://doi.org/10.1364/oe.521766\">10.1364/oe.521766</a>.","apa":"Hammer, M., Babel, S., Farheen, H., Padberg, L., Scheytt, J. C., Silberhorn, C., &#38; Förstner, J. (2024). Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides. <i>Optics Express</i>, <i>32</i>(13), 22878. <a href=\"https://doi.org/10.1364/oe.521766\">https://doi.org/10.1364/oe.521766</a>","bibtex":"@article{Hammer_Babel_Farheen_Padberg_Scheytt_Silberhorn_Förstner_2024, title={Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides}, volume={32}, DOI={<a href=\"https://doi.org/10.1364/oe.521766\">10.1364/oe.521766</a>}, number={13}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Hammer, Manfred and Babel, Silia and Farheen, Henna and Padberg, Laura and Scheytt, J. Christoph and Silberhorn, Christine and Förstner, Jens}, year={2024}, pages={22878} }","ama":"Hammer M, Babel S, Farheen H, et al. Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides. <i>Optics Express</i>. 2024;32(13):22878. doi:<a href=\"https://doi.org/10.1364/oe.521766\">10.1364/oe.521766</a>","mla":"Hammer, Manfred, et al. “Estimation of Losses Caused by Sidewall Roughness in Thin-Film Lithium Niobate Rib and Strip Waveguides.” <i>Optics Express</i>, vol. 32, no. 13, Optica Publishing Group, 2024, p. 22878, doi:<a href=\"https://doi.org/10.1364/oe.521766\">10.1364/oe.521766</a>."},"doi":"10.1364/oe.521766","language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2024-07-22T07:43:02Z","intvolume":"        32","title":"Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides","year":"2024","author":[{"full_name":"Hammer, Manfred","orcid":"0000-0002-6331-9348","last_name":"Hammer","first_name":"Manfred","id":"48077"},{"first_name":"Silia","last_name":"Babel","orcid":"https://orcid.org/0000-0002-1568-2580","full_name":"Babel, Silia","id":"63231"},{"id":"53444","last_name":"Farheen","first_name":"Henna","orcid":"0000-0001-7730-3489","full_name":"Farheen, Henna"},{"id":"40300","last_name":"Padberg","first_name":"Laura","full_name":"Padberg, Laura"},{"id":"37144","full_name":"Scheytt, J. Christoph","orcid":"0000-0002-5950-6618 ","first_name":"J. Christoph","last_name":"Scheytt"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","full_name":"Förstner, Jens","id":"158"}],"publication_identifier":{"issn":["1094-4087"]},"keyword":["tet_topic_waveguide"],"type":"journal_article","department":[{"_id":"61"},{"_id":"429"},{"_id":"623"},{"_id":"263"},{"_id":"288"}],"file":[{"date_updated":"2024-06-10T11:25:00Z","relation":"main_file","file_size":4004782,"access_level":"open_access","file_name":"2024-06 Hammer - Optics Express - Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides.pdf","content_type":"application/pdf","file_id":"54669","creator":"fossie","date_created":"2024-06-10T11:25:00Z"}],"date_created":"2024-06-10T11:18:06Z","abstract":[{"lang":"eng","text":"Samples of dielectric optical waveguides of rib or strip type in thin-film lithium niobate (TFLN) technology are characterized with respect to their optical loss using the Fabry-Pérot method. Attributing the losses mainly to sidewall roughness, we employ a simple perturbational procedure, based on rigorously computed mode profiles of idealized channels, to estimate the attenuation for waveguides with different cross sections. A single fit parameter suffices for an adequate modelling of the effect of the waveguide geometry on the loss levels."}],"issue":"13","publication":"Optics Express"},{"file":[{"content_type":"application/pdf","file_id":"55752","file_size":920206,"access_level":"local","file_name":"2024-08 Farheen - JOSA B - Symmetry-protected TM modes in rib-like, plus-shaped optical waveguides with shallow etching.pdf","date_updated":"2024-08-25T10:30:28Z","relation":"main_file","date_created":"2024-08-25T10:30:28Z","creator":"fossie"},{"content_type":"application/pdf","file_id":"55753","title":"(preprint)","access_level":"open_access","file_size":931810,"file_name":"2024-08 Farheen - JOSA B - Symmetry-protected TM modes in rib-like, plus-shaped optical waveguides with shallow etching (preprint).pdf","date_updated":"2024-08-25T10:48:05Z","relation":"main_file","date_created":"2024-08-25T10:48:05Z","creator":"fossie"}],"date_created":"2024-08-25T10:24:58Z","type":"journal_article","keyword":["tet_topic_waveguide"],"department":[{"_id":"61"},{"_id":"429"}],"publication":"Journal of the Optical Society of America B","issue":"9","abstract":[{"lang":"eng","text":"Lateral leakage of TM modes in dielectric optical waveguides of rib/ridge or strip-loaded types can be fully suppressed, if the waveguide core is formed not through a strip that protrudes at one side (up) from the remaining lateral guiding slab, but through parallel strips on both sides (up and down), such that the resulting cross section becomes vertically symmetric. The fairly general arguments underlying the leakage suppression apply to TM modes of all orders simultaneously, and are independent of wavelength. These plus-shaped waveguides support strictly guided, non-leaky TM modes for, in principle, arbitrarily shallow etching."}],"language":[{"iso":"eng"}],"doi":"10.1364/josab.528729","year":"2024","title":"Symmetry-protected TM modes in rib-like, plus-shaped optical waveguides with shallow etching","publication_identifier":{"issn":["0740-3224","1520-8540"]},"author":[{"full_name":"Üstün, Necati","first_name":"Necati","last_name":"Üstün"},{"id":"53444","last_name":"Farheen","first_name":"Henna","orcid":"0000-0001-7730-3489","full_name":"Farheen, Henna"},{"full_name":"Hammer, Manfred","first_name":"Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348","id":"48077"},{"full_name":"Förstner, Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens","id":"158"}],"publication_status":"published","date_updated":"2024-08-25T10:48:42Z","article_type":"original","intvolume":"        41","oa":"1","file_date_updated":"2024-08-25T10:48:05Z","citation":{"mla":"Üstün, Necati, et al. “Symmetry-Protected TM Modes in Rib-like, plus-Shaped Optical Waveguides with Shallow Etching.” <i>Journal of the Optical Society of America B</i>, vol. 41, no. 9, Optica Publishing Group, 2024, p. 2077, doi:<a href=\"https://doi.org/10.1364/josab.528729\">10.1364/josab.528729</a>.","ama":"Üstün N, Farheen H, Hammer M, Förstner J. Symmetry-protected TM modes in rib-like, plus-shaped optical waveguides with shallow etching. <i>Journal of the Optical Society of America B</i>. 2024;41(9):2077. doi:<a href=\"https://doi.org/10.1364/josab.528729\">10.1364/josab.528729</a>","bibtex":"@article{Üstün_Farheen_Hammer_Förstner_2024, title={Symmetry-protected TM modes in rib-like, plus-shaped optical waveguides with shallow etching}, volume={41}, DOI={<a href=\"https://doi.org/10.1364/josab.528729\">10.1364/josab.528729</a>}, number={9}, journal={Journal of the Optical Society of America B}, publisher={Optica Publishing Group}, author={Üstün, Necati and Farheen, Henna and Hammer, Manfred and Förstner, Jens}, year={2024}, pages={2077} }","apa":"Üstün, N., Farheen, H., Hammer, M., &#38; Förstner, J. (2024). Symmetry-protected TM modes in rib-like, plus-shaped optical waveguides with shallow etching. <i>Journal of the Optical Society of America B</i>, <i>41</i>(9), 2077. <a href=\"https://doi.org/10.1364/josab.528729\">https://doi.org/10.1364/josab.528729</a>","ieee":"N. Üstün, H. Farheen, M. Hammer, and J. Förstner, “Symmetry-protected TM modes in rib-like, plus-shaped optical waveguides with shallow etching,” <i>Journal of the Optical Society of America B</i>, vol. 41, no. 9, p. 2077, 2024, doi: <a href=\"https://doi.org/10.1364/josab.528729\">10.1364/josab.528729</a>.","chicago":"Üstün, Necati, Henna Farheen, Manfred Hammer, and Jens Förstner. “Symmetry-Protected TM Modes in Rib-like, plus-Shaped Optical Waveguides with Shallow Etching.” <i>Journal of the Optical Society of America B</i> 41, no. 9 (2024): 2077. <a href=\"https://doi.org/10.1364/josab.528729\">https://doi.org/10.1364/josab.528729</a>.","short":"N. Üstün, H. Farheen, M. Hammer, J. Förstner, Journal of the Optical Society of America B 41 (2024) 2077."},"project":[{"_id":"266","grant_number":"PROFILNRW-2020-067","name":"PhoQC: PhoQC: Photonisches Quantencomputing"},{"_id":"167","grant_number":"231447078","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)"}],"page":"2077","publisher":"Optica Publishing Group","_id":"55751","user_id":"158","ddc":["530"],"volume":41,"status":"public","has_accepted_license":"1"},{"has_accepted_license":"1","status":"public","ddc":["530"],"user_id":"158","publisher":"Optica Publishing Group","_id":"56193","page":"532822","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":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"}],"citation":{"ieee":"M. Hammer, H. Farheen, and J. Förstner, “Guided modes of thin-film lithium niobate slabs,” <i>Optics Continuum</i>, p. 532822, 2024, doi: <a href=\"https://doi.org/10.1364/optcon.532822\">10.1364/optcon.532822</a>.","apa":"Hammer, M., Farheen, H., &#38; Förstner, J. (2024). Guided modes of thin-film lithium niobate slabs. <i>Optics Continuum</i>, 532822. <a href=\"https://doi.org/10.1364/optcon.532822\">https://doi.org/10.1364/optcon.532822</a>","short":"M. Hammer, H. Farheen, J. Förstner, Optics Continuum (2024) 532822.","chicago":"Hammer, Manfred, Henna Farheen, and Jens Förstner. “Guided Modes of Thin-Film Lithium Niobate Slabs.” <i>Optics Continuum</i>, 2024, 532822. <a href=\"https://doi.org/10.1364/optcon.532822\">https://doi.org/10.1364/optcon.532822</a>.","mla":"Hammer, Manfred, et al. “Guided Modes of Thin-Film Lithium Niobate Slabs.” <i>Optics Continuum</i>, Optica Publishing Group, 2024, p. 532822, doi:<a href=\"https://doi.org/10.1364/optcon.532822\">10.1364/optcon.532822</a>.","bibtex":"@article{Hammer_Farheen_Förstner_2024, title={Guided modes of thin-film lithium niobate slabs}, DOI={<a href=\"https://doi.org/10.1364/optcon.532822\">10.1364/optcon.532822</a>}, journal={Optics Continuum}, publisher={Optica Publishing Group}, author={Hammer, Manfred and Farheen, Henna and Förstner, Jens}, year={2024}, pages={532822} }","ama":"Hammer M, Farheen H, Förstner J. Guided modes of thin-film lithium niobate slabs. <i>Optics Continuum</i>. Published online 2024:532822. doi:<a href=\"https://doi.org/10.1364/optcon.532822\">10.1364/optcon.532822</a>"},"file_date_updated":"2024-11-04T17:05:30Z","date_updated":"2024-11-04T17:07:27Z","publication_status":"published","publication_identifier":{"issn":["2770-0208"]},"author":[{"full_name":"Hammer, Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348","first_name":"Manfred","id":"48077"},{"id":"53444","full_name":"Farheen, Henna","first_name":"Henna","orcid":"0000-0001-7730-3489","last_name":"Farheen"},{"first_name":"Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","id":"158"}],"title":"Guided modes of thin-film lithium niobate slabs","year":"2024","doi":"10.1364/optcon.532822","language":[{"iso":"eng"}],"abstract":[{"text":"Dielectric slab waveguides made of thin-film-lithium-niobate (TFLN) media are consid-ered, for operation in the linear regime. We outline and implement a largely analytic procedure forrigorous modal analysis of three-layer slabs with birefringent, anisotropic core. For Z-cut wave-guides, the slab eigenmode problem separates into uncoupled sets of scalar equations for TE andTM modes. Slabs in X-cut configuration support mostly mildly hybrid eigenmodes, with clear pre-dominant TE or TM polarization, and with effective indices that depend on the propagation directionof the modes, relative to the crystal axes. Strong hybridization can be observed for near degeneratemodes in singular configurations without vertical symmetry, or in symmetric slabs where two nearlydegenerate modes are of the same symmetry class. Dispersion curves for slab thickness and propa-gation angle are discussed, for slabs with oxide and air cover. ","lang":"eng"}],"publication":"Optics Continuum","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"keyword":["tet_topic_waveguide"],"type":"journal_article","date_created":"2024-09-21T09:17:16Z","file":[{"date_updated":"2024-11-04T17:05:30Z","relation":"main_file","file_size":4399685,"access_level":"closed","file_name":"2024-11 Hammer - Optics Continuum - Guided modes of thin-film lithium niobate slabs.pdf","content_type":"application/pdf","success":1,"file_id":"56864","creator":"fossie","date_created":"2024-11-04T17:05:30Z"}]},{"ddc":["530"],"user_id":"158","volume":40,"page":"862","publisher":"Optica Publishing Group","_id":"43245","has_accepted_license":"1","status":"public","oa":"1","project":[{"name":"TRR 142: TRR 142","grant_number":"231447078","_id":"53"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"grant_number":"231447078","_id":"167","name":"TRR 142 - B06: TRR 142 - Subproject B06"}],"file_date_updated":"2023-03-31T13:14:59Z","citation":{"short":"M. Hammer, H. Farheen, J. Förstner, Journal of the Optical Society of America B 40 (2023) 862.","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>.","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>","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>.","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>","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} }","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>."},"doi":"10.1364/josab.485725","language":[{"iso":"eng"}],"date_updated":"2024-07-22T07:44:38Z","publication_status":"published","intvolume":"        40","year":"2023","title":"How to suppress radiative losses in high-contrast integrated Bragg gratings","author":[{"last_name":"Hammer","orcid":"0000-0002-6331-9348","first_name":"Manfred","full_name":"Hammer, Manfred","id":"48077"},{"id":"53444","full_name":"Farheen, Henna","orcid":"0000-0001-7730-3489","last_name":"Farheen","first_name":"Henna"},{"id":"158","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens","full_name":"Förstner, Jens"}],"publication_identifier":{"issn":["0740-3224","1520-8540"]},"keyword":["tet_topic_waveguide"],"type":"journal_article","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"file":[{"file_id":"43247","content_type":"application/pdf","relation":"main_file","date_updated":"2023-03-31T13:14:59Z","file_name":"ogr-afterreview.pdf","file_size":1982311,"access_level":"open_access","date_created":"2023-03-31T13:14:59Z","creator":"fossie"}],"date_created":"2023-03-31T13:04:43Z","abstract":[{"lang":"eng","text":"High-contrast slab waveguide Bragg gratings with 1D periodicity are investigated. For specific oblique excitation by semi-guided waves at sufficiently high angles of incidence, the idealized structures do not exhibit any radiative losses, such that reflectance and transmittance for the single port mode add strictly up to one. We consider a series of symmetric, fully and partly etched finite gratings, for parameters found in integrated silicon photonics. These can act as spectral filters with a reasonably flattop response. Apodization can lead to more box shaped reflectance and transmittance spectra. Together with a narrowband Fabry–Perot filter, these configurations are characterized by reflection bands, or transmittance peaks, with widths that span three orders of magnitude."}],"issue":"4","publication":"Journal of the Optical Society of America B"},{"has_accepted_license":"1","status":"public","editor":[{"full_name":"Andrews, David L.","last_name":"Andrews","first_name":"David L."},{"last_name":"Galvez","first_name":"Enrique J.","full_name":"Galvez, Enrique J."},{"first_name":"Halina","last_name":"Rubinsztein-Dunlop","full_name":"Rubinsztein-Dunlop, Halina"}],"user_id":"158","ddc":["530"],"_id":"30387","publisher":"SPIE","page":"120170F","project":[{"_id":"56","name":"TRR 142 - C: TRR 142 - Project Area C"},{"name":"TRR 142: TRR 142","_id":"53"},{"_id":"75","name":"TRR 142 - C5: TRR 142 - Subproject C5"}],"citation":{"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.","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>.","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>","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>.","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>","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} }","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>."},"file_date_updated":"2022-03-22T18:03:50Z","oa":"1","publication_status":"published","date_updated":"2022-03-22T18:04:20Z","author":[{"full_name":"Hammer, Manfred","orcid":"0000-0002-6331-9348","first_name":"Manfred","last_name":"Hammer","id":"48077"},{"id":"40428","full_name":"Ebers, Lena","last_name":"Ebers","first_name":"Lena"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens","full_name":"Förstner, Jens","id":"158"}],"title":"Resonant evanescent excitation of OAM modes in a high-contrast circular step-index fiber","year":"2022","doi":"10.1117/12.2612179","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Resonant evanescent coupling can be utilized to selectively excite orbital angular momentum (OAM) modes of high angular order supported by a thin circular dielectric rod. Our 2.5-D hybrid-analytical coupled mode model combines the vectorial fields associated with the fundamental TE- and TM-modes of a standard silicon photonics slab waveguide, propagating at oblique angles with respect to the rod axis, and the hybrid modes supported by the rod. One observes an efficient resonant interaction in cases where the common axial wavenumber of the waves in the slab matches the propagation constant of one or more modes of the rod. For certain modes of high angular order, the incident wave is able to transfer its directionality to the field in the fiber, exciting effectively only one of a pair of degenerate OAM modes"}],"publication":"Complex Light and Optical Forces XVI","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"type":"conference","keyword":["tet_topic_waveguide"],"date_created":"2022-03-21T10:12:58Z","file":[{"date_created":"2022-03-22T18:03:50Z","creator":"fossie","file_id":"30444","content_type":"application/pdf","relation":"main_file","date_updated":"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}]},{"department":[{"_id":"61"},{"_id":"230"}],"keyword":["tet_topic_waveguide"],"type":"dissertation","date_created":"2022-03-29T18:42:08Z","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"}],"citation":{"ieee":"L. Ebers, <i>Semi-guided waves in integrated optical waveguide structures</i>. 2022.","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>.","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>","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} }","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.","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>."},"supervisor":[{"id":"158","full_name":"Förstner, Jens","first_name":"Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner"}],"user_id":"158","doi":"10.17619/UNIPB/1-1288","language":[{"iso":"eng"}],"_id":"30722","date_updated":"2022-03-29T18:44:30Z","author":[{"full_name":"Ebers, Lena","last_name":"Ebers","first_name":"Lena","id":"40428"}],"status":"public","year":"2022","title":"Semi-guided waves in integrated optical waveguide structures"},{"department":[{"_id":"61"},{"_id":"230"}],"keyword":["tet_topic_waveguide"],"type":"journal_article","date_created":"2023-01-03T09:32:47Z","file":[{"embargo_to":"open_access","creator":"fossie","date_created":"2023-01-03T09:36:34Z","relation":"main_file","embargo":"2024-01-03","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","access_level":"local","file_size":3731864,"file_id":"35129","content_type":"application/pdf"}],"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"}],"issue":"2","publication":"Optics Letters","doi":"10.1364/ol.476537","language":[{"iso":"eng"}],"intvolume":"        48","date_updated":"2023-01-03T10:37:34Z","publication_status":"published","author":[{"full_name":"Nikbakht, Hamed","last_name":"Nikbakht","first_name":"Hamed"},{"first_name":"Mohammad Talebi","last_name":"Khoshmehr","full_name":"Khoshmehr, Mohammad Talebi"},{"full_name":"van Someren, Bob","last_name":"van Someren","first_name":"Bob"},{"last_name":"Teichrib","first_name":"Dieter","full_name":"Teichrib, Dieter"},{"id":"48077","full_name":"Hammer, Manfred","last_name":"Hammer","first_name":"Manfred","orcid":"0000-0002-6331-9348"},{"first_name":"Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","id":"158"},{"full_name":"Akca, B. Imran","last_name":"Akca","first_name":"B. Imran"}],"publication_identifier":{"issn":["0146-9592","1539-4794"]},"title":"Asymmetric, non-uniform 3-dB directional coupler with 300-nm bandwidth and a small footprint","year":"2022","citation":{"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>","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>.","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>.","short":"H. Nikbakht, M.T. Khoshmehr, B. van Someren, D. Teichrib, M. Hammer, J. Förstner, B.I. Akca, Optics Letters 48 (2022) 207.","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>"},"file_date_updated":"2023-01-03T09:36:34Z","volume":48,"ddc":["530"],"user_id":"158","publisher":"Optica Publishing Group","_id":"35128","page":"207","has_accepted_license":"1","status":"public"},{"oa":"1","citation":{"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>","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>.","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.","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>.","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>","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} }"},"file_date_updated":"2022-03-22T18:05:02Z","project":[{"_id":"53","name":"TRR 142: TRR 142"},{"name":"TRR 142 - C: TRR 142 - Project Area C","_id":"56"},{"name":"TRR 142 - C05: TRR 142 - Subproject C05","_id":"75"}],"publisher":"SPIE","_id":"30389","page":"1200414","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"}],"user_id":"158","ddc":["530"],"status":"public","has_accepted_license":"1","date_created":"2022-03-21T10:17:30Z","file":[{"creator":"fossie","date_created":"2022-03-22T18:05:02Z","date_updated":"2022-03-22T18:05:02Z","relation":"main_file","file_size":868473,"access_level":"open_access","file_name":"2022-03 Hammer - SPIE Photonics West 2022 - Small-scale online simulations in guided-wave photonics (official version).pdf","content_type":"application/pdf","file_id":"30445"}],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"keyword":["tet_topic_waveguide"],"type":"conference","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"}],"language":[{"iso":"eng"}],"doi":"10.1117/12.2612208","author":[{"id":"48077","last_name":"Hammer","orcid":"0000-0002-6331-9348","first_name":"Manfred","full_name":"Hammer, Manfred"}],"title":"Small-scale online simulations in guided-wave photonics","year":"2022","publication_status":"published","date_updated":"2023-04-20T10:10:55Z"},{"language":[{"iso":"eng"}],"doi":"10.1088/2515-7647/ac5a5b","author":[{"id":"40428","full_name":"Ebers, Lena","first_name":"Lena","last_name":"Ebers"},{"id":"65609","first_name":"Alessandro","last_name":"Ferreri","full_name":"Ferreri, Alessandro"},{"full_name":"Hammer, Manfred","orcid":"0000-0002-6331-9348","last_name":"Hammer","first_name":"Manfred","id":"48077"},{"last_name":"Albert","first_name":"Maximilian","full_name":"Albert, Maximilian"},{"id":"20798","full_name":"Meier, Cedrik","last_name":"Meier","first_name":"Cedrik","orcid":"https://orcid.org/0000-0002-3787-3572"},{"id":"158","orcid":"0000-0001-7059-9862","first_name":"Jens","last_name":"Förstner","full_name":"Förstner, Jens"},{"first_name":"Polina R.","last_name":"Sharapova","full_name":"Sharapova, Polina R.","id":"60286"}],"publication_identifier":{"issn":["2515-7647"]},"year":"2022","title":"Flexible source of correlated photons based on LNOI rib waveguides","intvolume":"         4","date_updated":"2025-12-16T11:31:04Z","publication_status":"published","date_created":"2022-03-07T09:51:50Z","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"15"},{"_id":"569"},{"_id":"170"},{"_id":"287"},{"_id":"35"},{"_id":"34"}],"type":"journal_article","keyword":["tet_topic_waveguide"],"publication":"Journal of Physics: Photonics","abstract":[{"text":"Lithium niobate on insulator (LNOI) has a great potential for photonic integrated circuits, providing substantial versatility in design of various integrated components. To properly use these components in the implementation of different quantum protocols, photons with different properties are required. In this paper, we theoretically demonstrate a flexible source of correlated photons built on the LNOI waveguide of a special geometry. This source is based on the parametric down-conversion (PDC) process, in which the signal and idler photons are generated at the telecom wavelength and have different spatial profiles and polarizations, but the same group velocities. Distinguishability in polarizations and spatial profiles facilitates the routing and manipulating individual photons, while the equality of their group velocities leads to the absence of temporal walk-off between photons. We show how the spectral properties of the generated photons and the number of their frequency modes can be controlled depending on the pump characteristics and the waveguide length. Finally, we discuss special regimes, in which narrowband light with strong frequency correlations and polarization-entangled Bell states are generated at the telecom wavelength.","lang":"eng"}],"related_material":{"link":[{"description":"Corrigendum for table C1","url":"https://doi.org/10.1088/2515-7647/acc70c","relation":"erratum"}]},"_id":"30210","publisher":"IOP Publishing","page":"025001","volume":4,"user_id":"16199","status":"public","citation":{"chicago":"Ebers, Lena, Alessandro Ferreri, Manfred Hammer, Maximilian Albert, Cedrik Meier, Jens Förstner, and Polina R. Sharapova. “Flexible Source of Correlated Photons Based on LNOI Rib Waveguides.” <i>Journal of Physics: Photonics</i> 4 (2022): 025001. <a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">https://doi.org/10.1088/2515-7647/ac5a5b</a>.","short":"L. Ebers, A. Ferreri, M. Hammer, M. Albert, C. Meier, J. Förstner, P.R. Sharapova, Journal of Physics: Photonics 4 (2022) 025001.","apa":"Ebers, L., Ferreri, A., Hammer, M., Albert, M., Meier, C., Förstner, J., &#38; Sharapova, P. R. (2022). Flexible source of correlated photons based on LNOI rib waveguides. <i>Journal of Physics: Photonics</i>, <i>4</i>, 025001. <a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">https://doi.org/10.1088/2515-7647/ac5a5b</a>","ieee":"L. Ebers <i>et al.</i>, “Flexible source of correlated photons based on LNOI rib waveguides,” <i>Journal of Physics: Photonics</i>, vol. 4, p. 025001, 2022, doi: <a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">10.1088/2515-7647/ac5a5b</a>.","ama":"Ebers L, Ferreri A, Hammer M, et al. Flexible source of correlated photons based on LNOI rib waveguides. <i>Journal of Physics: Photonics</i>. 2022;4:025001. doi:<a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">10.1088/2515-7647/ac5a5b</a>","bibtex":"@article{Ebers_Ferreri_Hammer_Albert_Meier_Förstner_Sharapova_2022, title={Flexible source of correlated photons based on LNOI rib waveguides}, volume={4}, DOI={<a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">10.1088/2515-7647/ac5a5b</a>}, journal={Journal of Physics: Photonics}, publisher={IOP Publishing}, author={Ebers, Lena and Ferreri, Alessandro and Hammer, Manfred and Albert, Maximilian and Meier, Cedrik and Förstner, Jens and Sharapova, Polina R.}, year={2022}, pages={025001} }","mla":"Ebers, Lena, et al. “Flexible Source of Correlated Photons Based on LNOI Rib Waveguides.” <i>Journal of Physics: Photonics</i>, vol. 4, IOP Publishing, 2022, p. 025001, doi:<a href=\"https://doi.org/10.1088/2515-7647/ac5a5b\">10.1088/2515-7647/ac5a5b</a>."},"project":[{"_id":"56","name":"TRR 142 - C: TRR 142 - Project Area C"},{"name":"TRR 142 - C5: TRR 142 - Subproject C5","_id":"75"},{"_id":"72","name":"TRR 142 - C2: TRR 142 - Subproject C2"},{"_id":"53","name":"TRR 142: TRR 142"},{"_id":"53","name":"TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen"}]},{"oa":"1","project":[{"_id":"53","name":"TRR 142"},{"_id":"56","name":"TRR 142 - Project Area C"}],"citation":{"ieee":"M. Hammer, L. Ebers, and J. Förstner, “Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics,” <i>OSA Continuum</i>, vol. 4, no. 12, p. 3081, 2021, doi: <a href=\"https://doi.org/10.1364/osac.437549\">10.1364/osac.437549</a>.","apa":"Hammer, M., Ebers, L., &#38; Förstner, J. (2021). Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics. <i>OSA Continuum</i>, <i>4</i>(12), 3081. <a href=\"https://doi.org/10.1364/osac.437549\">https://doi.org/10.1364/osac.437549</a>","chicago":"Hammer, Manfred, Lena Ebers, and Jens Förstner. “Configurable Lossless Broadband Beam Splitters for Semi-Guided Waves in Integrated Silicon Photonics.” <i>OSA Continuum</i> 4, no. 12 (2021): 3081. <a href=\"https://doi.org/10.1364/osac.437549\">https://doi.org/10.1364/osac.437549</a>.","short":"M. Hammer, L. Ebers, J. Förstner, OSA Continuum 4 (2021) 3081.","mla":"Hammer, Manfred, et al. “Configurable Lossless Broadband Beam Splitters for Semi-Guided Waves in Integrated Silicon Photonics.” <i>OSA Continuum</i>, vol. 4, no. 12, 2021, p. 3081, doi:<a href=\"https://doi.org/10.1364/osac.437549\">10.1364/osac.437549</a>.","bibtex":"@article{Hammer_Ebers_Förstner_2021, title={Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics}, volume={4}, DOI={<a href=\"https://doi.org/10.1364/osac.437549\">10.1364/osac.437549</a>}, number={12}, journal={OSA Continuum}, author={Hammer, Manfred and Ebers, Lena and Förstner, Jens}, year={2021}, pages={3081} }","ama":"Hammer M, Ebers L, Förstner J. Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics. <i>OSA Continuum</i>. 2021;4(12):3081. doi:<a href=\"https://doi.org/10.1364/osac.437549\">10.1364/osac.437549</a>"},"file_date_updated":"2021-11-30T20:19:15Z","volume":4,"ddc":["530"],"user_id":"477","_id":"28196","page":"3081","has_accepted_license":"1","status":"public","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"keyword":["tet_topic_waveguide"],"type":"journal_article","date_created":"2021-11-30T20:04:57Z","file":[{"access_level":"open_access","file_size":6618403,"file_name":"2021-11 Hammer - OSA Continuum - Trenches.pdf","date_updated":"2021-11-30T20:19:15Z","relation":"main_file","content_type":"application/pdf","file_id":"28197","creator":"fossie","date_created":"2021-11-30T20:07:53Z"}],"abstract":[{"lang":"eng","text":"We show that narrow trenches in a high-contrast silicon-photonics slab can act as lossless power dividers for semi-guided waves. Reflectance and transmittance can be easily configured by selecting the trench width. At sufficiently high angles of incidence, the devices are lossless, apart from material attenuation and scattering due to surface roughness. We numerically simulate a series of devices within the full 0-to-1-range of splitting ratios, for semi-guided plane wave incidence as well as for excitation by focused Gaussian wave bundles. Straightforward cascading of the trenches leads to concepts for 1×M-power dividers and a polarization beam splitter."}],"issue":"12","publication":"OSA Continuum","doi":"10.1364/osac.437549","language":[{"iso":"eng"}],"intvolume":"         4","date_updated":"2022-11-18T09:58:03Z","publication_status":"published","publication_identifier":{"issn":["2578-7519"]},"author":[{"id":"48077","orcid":"0000-0002-6331-9348","last_name":"Hammer","first_name":"Manfred","full_name":"Hammer, Manfred"},{"last_name":"Ebers","first_name":"Lena","full_name":"Ebers, Lena","id":"40428"},{"id":"158","full_name":"Förstner, Jens","last_name":"Förstner","first_name":"Jens","orcid":"0000-0001-7059-9862"}],"year":"2021","title":"Configurable lossless broadband beam splitters for semi-guided waves in integrated silicon photonics"},{"title":"Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics","year":"2020","publication_identifier":{"isbn":["9781943580811"]},"author":[{"id":"46170","full_name":"Protte, Maximilian","first_name":"Maximilian","last_name":"Protte"},{"id":"40428","first_name":"Lena","last_name":"Ebers","full_name":"Ebers, Lena"},{"full_name":"Hammer, Manfred","first_name":"Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348","id":"48077"},{"id":"33913","last_name":"Höpker","first_name":"Jan Philipp","full_name":"Höpker, Jan Philipp"},{"full_name":"Albert, Maximilian","last_name":"Albert","first_name":"Maximilian"},{"last_name":"Quiring","first_name":"Viktor","full_name":"Quiring, Viktor"},{"id":"20798","full_name":"Meier, Cedrik","last_name":"Meier","orcid":"https://orcid.org/0000-0002-3787-3572","first_name":"Cedrik"},{"id":"158","last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens","full_name":"Förstner, Jens"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"id":"49683","full_name":"Bartley, Tim","last_name":"Bartley","first_name":"Tim"}],"publication_status":"published","date_updated":"2022-10-25T07:41:15Z","article_number":"QTh7A.8","language":[{"iso":"eng"}],"doi":"10.1364/quantum.2020.qth7a.8","publication":"OSA Quantum 2.0 Conference","abstract":[{"text":"We fabricate silicon tapers to increase the mode overlap of superconducting detectors on Ti:LiNbO3 waveguides. Mode images show a reduction in mode size from 6 µm to 2 µm FWHM, agreeing with beam propagation simulations.","lang":"eng"}],"file":[{"file_name":"Quantum2.0-Towards SSC hybrid integration for quantum photonics[4936].pdf","file_size":1704199,"access_level":"closed","relation":"main_file","date_updated":"2021-04-22T15:58:52Z","file_id":"21720","content_type":"application/pdf","success":1,"creator":"fossie","date_created":"2021-04-22T15:58:52Z"}],"date_created":"2021-04-22T15:56:45Z","type":"conference","keyword":["tet_topic_waveguide"],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"15"}],"status":"public","has_accepted_license":"1","_id":"21719","user_id":"49683","ddc":["530"],"file_date_updated":"2021-04-22T15:58:52Z","citation":{"bibtex":"@inproceedings{Protte_Ebers_Hammer_Höpker_Albert_Quiring_Meier_Förstner_Silberhorn_Bartley_2020, title={Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics}, DOI={<a href=\"https://doi.org/10.1364/quantum.2020.qth7a.8\">10.1364/quantum.2020.qth7a.8</a>}, number={QTh7A.8}, booktitle={OSA Quantum 2.0 Conference}, author={Protte, Maximilian and Ebers, Lena and Hammer, Manfred and Höpker, Jan Philipp and Albert, Maximilian and Quiring, Viktor and Meier, Cedrik and Förstner, Jens and Silberhorn, Christine and Bartley, Tim}, year={2020} }","ama":"Protte M, Ebers L, Hammer M, et al. Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics. In: <i>OSA Quantum 2.0 Conference</i>. ; 2020. doi:<a href=\"https://doi.org/10.1364/quantum.2020.qth7a.8\">10.1364/quantum.2020.qth7a.8</a>","mla":"Protte, Maximilian, et al. “Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics.” <i>OSA Quantum 2.0 Conference</i>, QTh7A.8, 2020, doi:<a href=\"https://doi.org/10.1364/quantum.2020.qth7a.8\">10.1364/quantum.2020.qth7a.8</a>.","chicago":"Protte, Maximilian, Lena Ebers, Manfred Hammer, Jan Philipp Höpker, Maximilian Albert, Viktor Quiring, Cedrik Meier, Jens Förstner, Christine Silberhorn, and Tim Bartley. “Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics.” In <i>OSA Quantum 2.0 Conference</i>, 2020. <a href=\"https://doi.org/10.1364/quantum.2020.qth7a.8\">https://doi.org/10.1364/quantum.2020.qth7a.8</a>.","short":"M. Protte, L. Ebers, M. Hammer, J.P. Höpker, M. Albert, V. Quiring, C. Meier, J. Förstner, C. Silberhorn, T. Bartley, in: OSA Quantum 2.0 Conference, 2020.","ieee":"M. Protte <i>et al.</i>, “Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics,” 2020, doi: <a href=\"https://doi.org/10.1364/quantum.2020.qth7a.8\">10.1364/quantum.2020.qth7a.8</a>.","apa":"Protte, M., Ebers, L., Hammer, M., Höpker, J. P., Albert, M., Quiring, V., Meier, C., Förstner, J., Silberhorn, C., &#38; Bartley, T. (2020). Towards Semiconductor-Superconductor-Crystal Hybrid Integration for Quantum Photonics. <i>OSA Quantum 2.0 Conference</i>, Article QTh7A.8. <a href=\"https://doi.org/10.1364/quantum.2020.qth7a.8\">https://doi.org/10.1364/quantum.2020.qth7a.8</a>"}},{"date_updated":"2022-01-06T06:59:33Z","publication_status":"published","intvolume":"        26","article_type":"letter_note","year":"2018","title":"Oblique incidence of semi-guided planar waves on slab waveguide steps: effects of rounded edges","author":[{"id":"40428","full_name":"Ebers, Lena","first_name":"Lena","last_name":"Ebers"},{"id":"48077","full_name":"Hammer, Manfred","first_name":"Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348"},{"first_name":"Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","full_name":"Förstner, Jens","id":"158"}],"doi":"10.1364/OE.26.018621","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Oblique propagation of semi-guided waves across slab waveguide structures with bent corners is investigated. A critical angle can be defined beyond which all radiation losses are suppressed. Additionally an increase of the curvature radius of the bends also leads to low-loss configurations for incidence angles below that critical angle. A combination of two bent corner systems represents a step-like structure, behaving like a Fabry-Perot interferometer, with two partial reflectors separated by the vertical height between the horizontal slabs. We numerically analyse typical high-index-contrast Si/SiO2 structures for their reflectance and transmittance properties. When increasing the curvature radius the resonant effect becomes less relevant such that full transmittance is reached with less critical conditions on the vertical distance or the incidence angle. For practical interest 3-D problems are considered, where the structures are excited by the fundamental mode of a wide, shallow rib waveguide. High transmittance levels can be observed also for these 3-D configurations depending on the width of the rib."}],"publication":"Optics Express","issue":"14","keyword":["tet_topic_waveguide"],"type":"journal_article","department":[{"_id":"61"}],"file":[{"creator":"hclaudia","date_created":"2018-08-01T09:30:58Z","file_size":6193865,"access_level":"open_access","file_name":"2018-07 Ebers_Hammer_Förstner_OpticsExpress_Oblique incidence of semi guided planar waves on slab waveguide steps_Rounded Edges.pdf","date_updated":"2018-08-01T09:30:58Z","relation":"main_file","content_type":"application/pdf","file_id":"3741"}],"date_created":"2018-08-01T09:31:03Z","has_accepted_license":"1","status":"public","ddc":["620"],"user_id":"158","volume":26,"page":"18621-18632","publisher":"OSA Publishing","_id":"3740","urn":"37409","project":[{"_id":"56","name":"TRR 142 - Project Area C"},{"name":"TRR 142","_id":"53"},{"name":"TRR 142 - Subproject C5","_id":"75"}],"file_date_updated":"2018-08-01T09:30:58Z","citation":{"ama":"Ebers L, Hammer M, Förstner J. Oblique incidence of semi-guided planar waves on slab waveguide steps: effects of rounded edges. <i>Optics Express</i>. 2018;26(14):18621-18632. doi:<a href=\"https://doi.org/10.1364/OE.26.018621\">10.1364/OE.26.018621</a>","short":"L. Ebers, M. Hammer, J. Förstner, Optics Express 26 (2018) 18621–18632.","chicago":"Ebers, Lena, Manfred Hammer, and Jens Förstner. “Oblique Incidence of Semi-Guided Planar Waves on Slab Waveguide Steps: Effects of Rounded Edges.” <i>Optics Express</i> 26, no. 14 (2018): 18621–32. <a href=\"https://doi.org/10.1364/OE.26.018621\">https://doi.org/10.1364/OE.26.018621</a>.","bibtex":"@article{Ebers_Hammer_Förstner_2018, title={Oblique incidence of semi-guided planar waves on slab waveguide steps: effects of rounded edges}, volume={26}, DOI={<a href=\"https://doi.org/10.1364/OE.26.018621\">10.1364/OE.26.018621</a>}, number={14}, journal={Optics Express}, publisher={OSA Publishing}, author={Ebers, Lena and Hammer, Manfred and Förstner, Jens}, year={2018}, pages={18621–18632} }","mla":"Ebers, Lena, et al. “Oblique Incidence of Semi-Guided Planar Waves on Slab Waveguide Steps: Effects of Rounded Edges.” <i>Optics Express</i>, vol. 26, no. 14, OSA Publishing, 2018, pp. 18621–32, doi:<a href=\"https://doi.org/10.1364/OE.26.018621\">10.1364/OE.26.018621</a>.","apa":"Ebers, L., Hammer, M., &#38; Förstner, J. (2018). Oblique incidence of semi-guided planar waves on slab waveguide steps: effects of rounded edges. <i>Optics Express</i>, <i>26</i>(14), 18621–18632. <a href=\"https://doi.org/10.1364/OE.26.018621\">https://doi.org/10.1364/OE.26.018621</a>","ieee":"L. Ebers, M. Hammer, and J. Förstner, “Oblique incidence of semi-guided planar waves on slab waveguide steps: effects of rounded edges,” <i>Optics Express</i>, vol. 26, no. 14, pp. 18621–18632, 2018."},"oa":"1"},{"page":"77-105","publisher":"Springer","_id":"3743","edition":"204","user_id":"55706","volume":204,"editor":[{"first_name":"Arti","last_name":"Agrawal","full_name":"Agrawal, Arti"}],"status":"public","citation":{"chicago":"Hammer, Manfred. “Guided Wave Interaction in Photonic Integrated Circuits — A Hybrid Analytical/Numerical Approach to Coupled Mode Theory.” In <i>Recent Trends in Computational Photonics</i>, edited by Arti Agrawal, 204th ed., 204:77–105.  Springer Series in Optical Sciences Book Series. Springer, 2017.","short":"M. Hammer, in: A. Agrawal (Ed.), Recent Trends in Computational Photonics, 204th ed., Springer, 2017, pp. 77–105.","ieee":"M. Hammer, “Guided Wave Interaction in Photonic Integrated Circuits — A Hybrid Analytical/Numerical Approach to Coupled Mode Theory,” in <i>Recent Trends in Computational Photonics</i>, 204th ed., vol. 204, A. Agrawal, Ed. Springer, 2017, pp. 77–105.","apa":"Hammer, M. (2017). Guided Wave Interaction in Photonic Integrated Circuits — A Hybrid Analytical/Numerical Approach to Coupled Mode Theory. In A. Agrawal (Ed.), <i>Recent Trends in Computational Photonics</i> (204th ed., Vol. 204, pp. 77–105). Springer.","bibtex":"@inbook{Hammer_2017, edition={204}, series={ Springer Series in Optical Sciences book series}, title={Guided Wave Interaction in Photonic Integrated Circuits — A Hybrid Analytical/Numerical Approach to Coupled Mode Theory}, volume={204}, booktitle={Recent Trends in Computational Photonics}, publisher={Springer}, author={Hammer, Manfred}, editor={Agrawal, ArtiEditor}, year={2017}, pages={77–105}, collection={ Springer Series in Optical Sciences book series} }","ama":"Hammer M. Guided Wave Interaction in Photonic Integrated Circuits — A Hybrid Analytical/Numerical Approach to Coupled Mode Theory. In: Agrawal A, ed. <i>Recent Trends in Computational Photonics</i>. Vol 204. 204th ed.  Springer Series in Optical Sciences book series. Springer; 2017:77-105.","mla":"Hammer, Manfred. “Guided Wave Interaction in Photonic Integrated Circuits — A Hybrid Analytical/Numerical Approach to Coupled Mode Theory.” <i>Recent Trends in Computational Photonics</i>, edited by Arti Agrawal, 204th ed., vol. 204, Springer, 2017, pp. 77–105."},"series_title":" Springer Series in Optical Sciences book series","language":[{"iso":"eng"}],"year":"2017","title":"Guided Wave Interaction in Photonic Integrated Circuits — A Hybrid Analytical/Numerical Approach to Coupled Mode Theory","publication_identifier":{"isbn":["978-3-319-55438-9"]},"author":[{"first_name":"Manfred","orcid":"0000-0002-6331-9348","last_name":"Hammer","full_name":"Hammer, Manfred","id":"48077"}],"publication_status":"published","date_updated":"2022-01-06T06:59:34Z","intvolume":"       204","date_created":"2018-08-01T10:44:00Z","type":"book_chapter","keyword":["tet_topic_waveguide","tet_topic_numerics"],"department":[{"_id":"61"}],"publication":"Recent Trends in Computational Photonics","abstract":[{"text":"Frequently, optical integrated circuits combine elements (waveguide channels, cavities), the simulation of which is well established through mature numerical eigenproblem solvers. It remains to predict the interaction of these modes. We address this task by a general, “Hybrid” variant (HCMT) of Coupled Mode Theory. Using methods from finite-element numerics, the properties of a circuit are approximated by superpositions of eigen-solutions for its constituents, leading to quantitative, computationally cheap, and easily interpretable models.","lang":"eng"}]},{"publisher":"The Optical Society","_id":"3828","urn":"38287","page":"613-624","volume":34,"user_id":"158","ddc":["530"],"status":"public","has_accepted_license":"1","oa":"1","citation":{"mla":"Hammer, Manfred, et al. “Hybrid Coupled-Mode Modeling in 3D: Perturbed and Coupled Channels, and Waveguide Crossings.” <i>Journal of the Optical Society of America B</i>, vol. 34, no. 3, The Optical Society, 2017, pp. 613–24, doi:<a href=\"https://doi.org/10.1364/josab.34.000613\">10.1364/josab.34.000613</a>.","bibtex":"@article{Hammer_Alhaddad_Förstner_2017, title={Hybrid coupled-mode modeling in 3D: perturbed and coupled channels, and waveguide crossings}, volume={34}, DOI={<a href=\"https://doi.org/10.1364/josab.34.000613\">10.1364/josab.34.000613</a>}, number={3}, journal={Journal of the Optical Society of America B}, publisher={The Optical Society}, author={Hammer, Manfred and Alhaddad, Samer and Förstner, Jens}, year={2017}, pages={613–624} }","ama":"Hammer M, Alhaddad S, Förstner J. Hybrid coupled-mode modeling in 3D: perturbed and coupled channels, and waveguide crossings. <i>Journal of the Optical Society of America B</i>. 2017;34(3):613-624. doi:<a href=\"https://doi.org/10.1364/josab.34.000613\">10.1364/josab.34.000613</a>","ieee":"M. Hammer, S. Alhaddad, and J. Förstner, “Hybrid coupled-mode modeling in 3D: perturbed and coupled channels, and waveguide crossings,” <i>Journal of the Optical Society of America B</i>, vol. 34, no. 3, pp. 613–624, 2017.","apa":"Hammer, M., Alhaddad, S., &#38; Förstner, J. (2017). Hybrid coupled-mode modeling in 3D: perturbed and coupled channels, and waveguide crossings. <i>Journal of the Optical Society of America B</i>, <i>34</i>(3), 613–624. <a href=\"https://doi.org/10.1364/josab.34.000613\">https://doi.org/10.1364/josab.34.000613</a>","chicago":"Hammer, Manfred, Samer Alhaddad, and Jens Förstner. “Hybrid Coupled-Mode Modeling in 3D: Perturbed and Coupled Channels, and Waveguide Crossings.” <i>Journal of the Optical Society of America B</i> 34, no. 3 (2017): 613–24. <a href=\"https://doi.org/10.1364/josab.34.000613\">https://doi.org/10.1364/josab.34.000613</a>.","short":"M. Hammer, S. Alhaddad, J. Förstner, Journal of the Optical Society of America B 34 (2017) 613–624."},"file_date_updated":"2018-09-03T14:09:04Z","language":[{"iso":"eng"}],"doi":"10.1364/josab.34.000613","author":[{"first_name":"Manfred","orcid":"0000-0002-6331-9348","last_name":"Hammer","full_name":"Hammer, Manfred","id":"48077"},{"full_name":"Alhaddad, Samer","last_name":"Alhaddad","first_name":"Samer"},{"first_name":"Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","full_name":"Förstner, Jens","id":"158"}],"publication_identifier":{"issn":["0740-3224","1520-8540"]},"title":"Hybrid coupled-mode modeling in 3D: perturbed and coupled channels, and waveguide crossings","year":"2017","article_type":"original","intvolume":"        34","publication_status":"published","date_updated":"2022-01-06T06:59:38Z","date_created":"2018-08-07T08:40:41Z","file":[{"date_updated":"2018-09-03T14:09:04Z","relation":"main_file","access_level":"open_access","file_size":5539592,"file_name":"2017-02 Hammer_Hybrid coupled mode modelling in 3D_Perturbed and coupled channels and waveguide crossings_Coupled Mode Theory JOSA B.pdf","content_type":"application/pdf","file_id":"3829","creator":"hclaudia","date_created":"2018-08-07T09:46:13Z"}],"department":[{"_id":"61"}],"keyword":["tet_topic_waveguide","tet_topic_numerics"],"type":"journal_article","publication":"Journal of the Optical Society of America B","issue":"3","abstract":[{"text":"The 3D implementation of a hybrid analytical/numerical variant of the coupled-mode theory is discussed.\r\nEigenmodes of the constituting dielectric channels are computed numerically. The frequency-domain\r\ncoupled-mode models then combine these into fully vectorial approximations for the optical electromagnetic\r\nfields of the composite structure. Following a discretization of amplitude functions by 1D finite elements, pro-\r\ncedures from the realm of finite-element numerics are applied to establish systems of linear equations for the then-\r\ndiscrete modal amplitudes. Examples substantiate the functioning of the technique and allow for some numerical\r\nassessment. The full 3D simulations are highly efficient in memory consumption, moderately demanding in com-\r\nputational time, and, in regimes of low radiative losses, sufficiently accurate for practical design. Our results\r\ninclude the perturbation of guided modes by changes of the refractive indices, the interaction of waves in parallel,\r\nhorizontally or vertically coupled straight waveguides, and a series of crossings of potentially overlapping channels\r\nwith fairly arbitrary relative positions and orientations.","lang":"eng"}]},{"project":[{"_id":"53","name":"TRR 142"},{"name":"TRR 142 - Project Area A","_id":"54"},{"name":"TRR 142 - Subproject A5","_id":"62"}],"file_date_updated":"2022-01-06T06:59:38Z","citation":{"ieee":"L. Ebers, M. Hammer, and J. Förstner, “Spiral modes supported by circular dielectric tubes and tube segments,” <i>Optical and Quantum Electronics</i>, vol. 49, no. 4, p. 49:176, 2017.","apa":"Ebers, L., Hammer, M., &#38; Förstner, J. (2017). Spiral modes supported by circular dielectric tubes and tube segments. <i>Optical and Quantum Electronics</i>, <i>49</i>(4), 49:176. <a href=\"https://doi.org/10.1007/s11082-017-1011-x\">https://doi.org/10.1007/s11082-017-1011-x</a>","chicago":"Ebers, Lena, Manfred Hammer, and Jens Förstner. “Spiral Modes Supported by Circular Dielectric Tubes and Tube Segments.” <i>Optical and Quantum Electronics</i> 49, no. 4 (2017): 49:176. <a href=\"https://doi.org/10.1007/s11082-017-1011-x\">https://doi.org/10.1007/s11082-017-1011-x</a>.","short":"L. Ebers, M. Hammer, J. Förstner, Optical and Quantum Electronics 49 (2017) 49:176.","mla":"Ebers, Lena, et al. “Spiral Modes Supported by Circular Dielectric Tubes and Tube Segments.” <i>Optical and Quantum Electronics</i>, vol. 49, no. 4, Springer Nature, 2017, p. 49:176, doi:<a href=\"https://doi.org/10.1007/s11082-017-1011-x\">10.1007/s11082-017-1011-x</a>.","bibtex":"@article{Ebers_Hammer_Förstner_2017, title={Spiral modes supported by circular dielectric tubes and tube segments}, volume={49}, DOI={<a href=\"https://doi.org/10.1007/s11082-017-1011-x\">10.1007/s11082-017-1011-x</a>}, number={4}, journal={Optical and Quantum Electronics}, publisher={Springer Nature}, author={Ebers, Lena and Hammer, Manfred and Förstner, Jens}, year={2017}, pages={49:176} }","ama":"Ebers L, Hammer M, Förstner J. Spiral modes supported by circular dielectric tubes and tube segments. <i>Optical and Quantum Electronics</i>. 2017;49(4):49:176. doi:<a href=\"https://doi.org/10.1007/s11082-017-1011-x\">10.1007/s11082-017-1011-x</a>"},"has_accepted_license":"1","status":"public","user_id":"158","ddc":["530"],"volume":49,"page":"49:176","publisher":"Springer Nature","_id":"3830","urn":"38308","abstract":[{"text":"The modal properties of curved dielectric slab waveguides are investigated. We\r\nconsider quasi-confined, attenuated modes that propagate at oblique angles with respect to\r\nthe axis through the center of curvature. Our analytical model describes the transition from\r\nscalar 2-D TE/TM bend modes to lossless spiral waves at near-axis propagation angles,\r\nwith a continuum of vectorial attenuated spiral modes in between. Modal solutions are\r\ncharacterized in terms of directional wavenumbers and attenuation constants. Examples for\r\nvectorial mode profiles illustrate the effects of oblique wave propagation along the curved\r\nslab segments. For the regime of lossless spiral waves, the relation with the guided modes\r\nof corresponding dielectric tubes is demonstrated.","lang":"eng"}],"issue":"4","publication":"Optical and Quantum Electronics","type":"journal_article","keyword":["tet_topic_waveguide"],"department":[{"_id":"61"}],"file":[{"content_type":"application/pdf","file_id":"3831","date_updated":"2022-01-06T06:59:38Z","relation":"main_file","access_level":"request","file_size":2379736,"file_name":"2017-03 Ebers, Hammer_Spiral modes supported by circular dielectric tubes and tube segments.pdf","date_created":"2018-08-07T09:56:27Z","creator":"hclaudia"}],"date_created":"2018-08-07T09:52:20Z","publication_status":"published","date_updated":"2022-01-06T06:59:39Z","article_type":"original","intvolume":"        49","year":"2017","title":"Spiral modes supported by circular dielectric tubes and tube segments","publication_identifier":{"issn":["0306-8919","1572-817X"]},"author":[{"id":"40428","first_name":"Lena","last_name":"Ebers","full_name":"Ebers, Lena"},{"first_name":"Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348","full_name":"Hammer, Manfred","id":"48077"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens","full_name":"Förstner, Jens","id":"158"}],"doi":"10.1007/s11082-017-1011-x","language":[{"iso":"eng"}]},{"editor":[{"first_name":"Jean-Emmanuel","last_name":"Broquin","full_name":"Broquin, Jean-Emmanuel"},{"last_name":"Nunzi Conti","first_name":"Gualtiero","full_name":"Nunzi Conti, Gualtiero"}],"ddc":["530"],"user_id":"158","_id":"3543","publisher":"SPIE","has_accepted_license":"1","status":"public","citation":{"chicago":"Hildebrandt, Andre, Samer Alhaddad, Manfred Hammer, and Jens Förstner. “Oblique Incidence of Semi-Guided Waves on Step-like Folds in Planar Dielectric Slabs: Lossless Vertical Interconnects in 3D Integrated Photonic Circuits.” In <i>Integrated Optics: Devices, Materials, and Technologies XX</i>, edited by Jean-Emmanuel Broquin and Gualtiero Nunzi Conti. SPIE, 2016. <a href=\"https://doi.org/10.1117/12.2214460\">https://doi.org/10.1117/12.2214460</a>.","short":"A. Hildebrandt, S. Alhaddad, M. Hammer, J. Förstner, in: J.-E. Broquin, G. Nunzi Conti (Eds.), Integrated Optics: Devices, Materials, and Technologies XX, SPIE, 2016.","ieee":"A. Hildebrandt, S. Alhaddad, M. Hammer, and J. Förstner, “Oblique incidence of semi-guided waves on step-like folds in planar dielectric slabs: Lossless vertical interconnects in 3D integrated photonic circuits,” in <i>Integrated Optics: Devices, Materials, and Technologies XX</i>, 2016.","apa":"Hildebrandt, A., Alhaddad, S., Hammer, M., &#38; Förstner, J. (2016). Oblique incidence of semi-guided waves on step-like folds in planar dielectric slabs: Lossless vertical interconnects in 3D integrated photonic circuits. In J.-E. Broquin &#38; G. Nunzi Conti (Eds.), <i>Integrated Optics: Devices, Materials, and Technologies XX</i>. SPIE. <a href=\"https://doi.org/10.1117/12.2214460\">https://doi.org/10.1117/12.2214460</a>","bibtex":"@inproceedings{Hildebrandt_Alhaddad_Hammer_Förstner_2016, title={Oblique incidence of semi-guided waves on step-like folds in planar dielectric slabs: Lossless vertical interconnects in 3D integrated photonic circuits}, DOI={<a href=\"https://doi.org/10.1117/12.2214460\">10.1117/12.2214460</a>}, booktitle={Integrated Optics: Devices, Materials, and Technologies XX}, publisher={SPIE}, author={Hildebrandt, Andre and Alhaddad, Samer and Hammer, Manfred and Förstner, Jens}, editor={Broquin, Jean-Emmanuel and Nunzi Conti, GualtieroEditors}, year={2016} }","ama":"Hildebrandt A, Alhaddad S, Hammer M, Förstner J. Oblique incidence of semi-guided waves on step-like folds in planar dielectric slabs: Lossless vertical interconnects in 3D integrated photonic circuits. In: Broquin J-E, Nunzi Conti G, eds. <i>Integrated Optics: Devices, Materials, and Technologies XX</i>. SPIE; 2016. doi:<a href=\"https://doi.org/10.1117/12.2214460\">10.1117/12.2214460</a>","mla":"Hildebrandt, Andre, et al. “Oblique Incidence of Semi-Guided Waves on Step-like Folds in Planar Dielectric Slabs: Lossless Vertical Interconnects in 3D Integrated Photonic Circuits.” <i>Integrated Optics: Devices, Materials, and Technologies XX</i>, edited by Jean-Emmanuel Broquin and Gualtiero Nunzi Conti, SPIE, 2016, doi:<a href=\"https://doi.org/10.1117/12.2214460\">10.1117/12.2214460</a>."},"file_date_updated":"2018-07-11T09:38:29Z","doi":"10.1117/12.2214460","language":[{"iso":"eng"}],"date_updated":"2022-01-06T06:59:23Z","publication_status":"published","author":[{"first_name":"Andre","last_name":"Hildebrandt","full_name":"Hildebrandt, Andre"},{"full_name":"Alhaddad, Samer","last_name":"Alhaddad","first_name":"Samer","id":"42456"},{"id":"48077","full_name":"Hammer, Manfred","first_name":"Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348"},{"full_name":"Förstner, Jens","first_name":"Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","id":"158"}],"year":"2016","title":"Oblique incidence of semi-guided waves on step-like folds in planar dielectric slabs: Lossless vertical interconnects in 3D integrated photonic circuits","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"type":"conference","keyword":["tet_topic_waveguide"],"date_created":"2018-07-11T09:35:06Z","file":[{"relation":"main_file","date_updated":"2018-07-11T09:38:29Z","file_name":"2016-02 Hildebrandt SPIE OPTO 2016.pdf","access_level":"closed","file_size":1239213,"file_id":"3544","success":1,"content_type":"application/pdf","creator":"fossie","date_created":"2018-07-11T09:38:29Z"}],"publication":"Integrated Optics: Devices, Materials, and Technologies XX"},{"doi":"10.1117/12.2214331","language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2022-01-06T06:59:56Z","author":[{"id":"48077","full_name":"Hammer, Manfred","orcid":"0000-0002-6331-9348","first_name":"Manfred","last_name":"Hammer"}],"year":"2016","title":"Wave interaction in photonic integrated circuits: Hybrid analytical / numerical coupled mode modeling","department":[{"_id":"61"}],"keyword":["tet_topic_waveguide","tet_topic_numerics"],"type":"conference","date_created":"2018-08-20T09:25:13Z","abstract":[{"lang":"eng","text":"Typical optical integrated circuits combine elements, like straight and curved waveguides, or cavities, the simulation and design of which is well established through numerical eigenproblem-solvers. It remains to predict the interaction of these modes. We address this task by a ”Hybrid” variant (HCMT) of Coupled Mode Theory. Using methods from finite-element numerics, the optical properties of a circuit are approximated by superpositions of eigen-solutions for its constituents, leading to quantitative, low-dimensional, and interpretable models in the frequency domain. Spectral scans are complemented by the direct computation of supermode properties (spectral positions and linewidths, coupling-induced phase shifts). This contribution outlines the theoretical background, and discusses briefly limitations and implementational details, with the help of an example of a 2-D coupled-resonator-optical-waveguide configuration."}],"publication":"Integrated Optics: Devices, Materials, and Technologies XX","issue":"9750","editor":[{"last_name":"Broquin","first_name":"Jean-Emmanuel","full_name":"Broquin, Jean-Emmanuel"},{"last_name":"Nunzi Conti","first_name":"Gualtiero","full_name":"Nunzi Conti, Gualtiero"}],"user_id":"55706","publisher":"SPIE","_id":"3934","page":"975018-975018-8 ","conference":{"location":"San Francisco, USA","name":"Photonics West 2016/OPTO 2016"},"status":"public","citation":{"ama":"Hammer M. Wave interaction in photonic integrated circuits: Hybrid analytical / numerical coupled mode modeling. In: Broquin J-E, Nunzi Conti G, eds. <i>Integrated Optics: Devices, Materials, and Technologies XX</i>. SPIE; 2016:975018-975018-8. doi:<a href=\"https://doi.org/10.1117/12.2214331\">10.1117/12.2214331</a>","bibtex":"@inproceedings{Hammer_2016, title={Wave interaction in photonic integrated circuits: Hybrid analytical / numerical coupled mode modeling}, DOI={<a href=\"https://doi.org/10.1117/12.2214331\">10.1117/12.2214331</a>}, number={9750}, booktitle={Integrated Optics: Devices, Materials, and Technologies XX}, publisher={SPIE}, author={Hammer, Manfred}, editor={Broquin, Jean-Emmanuel and Nunzi Conti, GualtieroEditors}, year={2016}, pages={975018-975018–8} }","mla":"Hammer, Manfred. “Wave Interaction in Photonic Integrated Circuits: Hybrid Analytical / Numerical Coupled Mode Modeling.” <i>Integrated Optics: Devices, Materials, and Technologies XX</i>, edited by Jean-Emmanuel Broquin and Gualtiero Nunzi Conti, no. 9750, SPIE, 2016, pp. 975018-975018–8, doi:<a href=\"https://doi.org/10.1117/12.2214331\">10.1117/12.2214331</a>.","chicago":"Hammer, Manfred. “Wave Interaction in Photonic Integrated Circuits: Hybrid Analytical / Numerical Coupled Mode Modeling.” In <i>Integrated Optics: Devices, Materials, and Technologies XX</i>, edited by Jean-Emmanuel Broquin and Gualtiero Nunzi Conti, 975018-975018–8. SPIE, 2016. <a href=\"https://doi.org/10.1117/12.2214331\">https://doi.org/10.1117/12.2214331</a>.","short":"M. Hammer, in: J.-E. Broquin, G. Nunzi Conti (Eds.), Integrated Optics: Devices, Materials, and Technologies XX, SPIE, 2016, pp. 975018-975018–8.","apa":"Hammer, M. (2016). Wave interaction in photonic integrated circuits: Hybrid analytical / numerical coupled mode modeling. In J.-E. Broquin &#38; G. Nunzi Conti (Eds.), <i>Integrated Optics: Devices, Materials, and Technologies XX</i> (pp. 975018-975018–8). San Francisco, USA: SPIE. <a href=\"https://doi.org/10.1117/12.2214331\">https://doi.org/10.1117/12.2214331</a>","ieee":"M. Hammer, “Wave interaction in photonic integrated circuits: Hybrid analytical / numerical coupled mode modeling,” in <i>Integrated Optics: Devices, Materials, and Technologies XX</i>, San Francisco, USA, 2016, no. 9750, pp. 975018-975018–8."}},{"_id":"3845","publisher":"Elsevier BV","page":"29-37","volume":365,"ddc":["530"],"user_id":"55706","status":"public","has_accepted_license":"1","citation":{"ama":"Civitci F, Hammer M, Hoekstra HJWM. Planar prism spectrometer based on adiabatically connected waveguiding slabs. <i>Optics Communications</i>. 2015;365:29-37. doi:<a href=\"https://doi.org/10.1016/j.optcom.2015.11.066\">10.1016/j.optcom.2015.11.066</a>","bibtex":"@article{Civitci_Hammer_Hoekstra_2015, title={Planar prism spectrometer based on adiabatically connected waveguiding slabs}, volume={365}, DOI={<a href=\"https://doi.org/10.1016/j.optcom.2015.11.066\">10.1016/j.optcom.2015.11.066</a>}, journal={Optics Communications}, publisher={Elsevier BV}, author={Civitci, F. and Hammer, Manfred and Hoekstra, H.J.W.M.}, year={2015}, pages={29–37} }","mla":"Civitci, F., et al. “Planar Prism Spectrometer Based on Adiabatically Connected Waveguiding Slabs.” <i>Optics Communications</i>, vol. 365, Elsevier BV, 2015, pp. 29–37, doi:<a href=\"https://doi.org/10.1016/j.optcom.2015.11.066\">10.1016/j.optcom.2015.11.066</a>.","short":"F. Civitci, M. Hammer, H.J.W.M. Hoekstra, Optics Communications 365 (2015) 29–37.","chicago":"Civitci, F., Manfred Hammer, and H.J.W.M. Hoekstra. “Planar Prism Spectrometer Based on Adiabatically Connected Waveguiding Slabs.” <i>Optics Communications</i> 365 (2015): 29–37. <a href=\"https://doi.org/10.1016/j.optcom.2015.11.066\">https://doi.org/10.1016/j.optcom.2015.11.066</a>.","apa":"Civitci, F., Hammer, M., &#38; Hoekstra, H. J. W. M. (2015). Planar prism spectrometer based on adiabatically connected waveguiding slabs. <i>Optics Communications</i>, <i>365</i>, 29–37. <a href=\"https://doi.org/10.1016/j.optcom.2015.11.066\">https://doi.org/10.1016/j.optcom.2015.11.066</a>","ieee":"F. Civitci, M. Hammer, and H. J. W. M. Hoekstra, “Planar prism spectrometer based on adiabatically connected waveguiding slabs,” <i>Optics Communications</i>, vol. 365, pp. 29–37, 2015."},"file_date_updated":"2018-08-08T10:31:23Z","language":[{"iso":"eng"}],"doi":"10.1016/j.optcom.2015.11.066","author":[{"first_name":"F.","last_name":"Civitci","full_name":"Civitci, F."},{"last_name":"Hammer","orcid":"0000-0002-6331-9348","first_name":"Manfred","full_name":"Hammer, Manfred","id":"48077"},{"full_name":"Hoekstra, H.J.W.M.","last_name":"Hoekstra","first_name":"H.J.W.M."}],"publication_identifier":{"issn":["0030-4018"]},"title":"Planar prism spectrometer based on adiabatically connected waveguiding slabs","year":"2015","intvolume":"       365","article_type":"original","date_updated":"2022-01-06T06:59:44Z","publication_status":"published","date_created":"2018-08-08T10:27:57Z","file":[{"content_type":"application/pdf","success":1,"file_id":"3846","access_level":"closed","file_size":1542539,"file_name":"2016  Hammer_Planar prism spectrometer based on adiabatically connected waveguiding slabs.pdf","date_updated":"2018-08-08T10:31:23Z","relation":"main_file","date_created":"2018-08-08T10:31:23Z","creator":"hclaudia"}],"department":[{"_id":"61"}],"type":"journal_article","keyword":["tet_topic_waveguide"],"publication":"Optics Communications","abstract":[{"text":"The device principle of a prism-based on-chip spectrometer for TE polarization is introduced. The spectrometer exploits the modal dispersion in planar waveguides in a layout with slab regions having two different thicknesses of the guiding layer. The set-up uses parabolic mirrors, for the collimation of light of the input waveguide and focusing of the light to the receiver waveguides, which relies on total internal reflection at the interface between two such regions. These regions are connected adiabatically to prevent unwanted mode conversion and loss at the edges of the prism. The structure can be fabricated with two wet etching steps. The paper presents basic theory and a general approach for device optimization. The latter is illustrated with a numerical example assuming SiON technology.","lang":"eng"}]}]