[{"article_number":"54320","_id":"64662","department":[{"_id":"15"}],"user_id":"20798","status":"public","type":"journal_article","doi":"10.1364/oe.572063","date_updated":"2026-02-26T09:44:49Z","volume":33,"author":[{"first_name":"Marius","last_name":"Brinkmann","full_name":"Brinkmann, Marius"},{"full_name":"Meier, Falco","last_name":"Meier","first_name":"Falco"},{"last_name":"Spedt","full_name":"Spedt, Vladimir","first_name":"Vladimir"},{"first_name":"Cedrik","last_name":"Meier","orcid":"https://orcid.org/0000-0002-3787-3572","full_name":"Meier, Cedrik","id":"20798"}],"intvolume":" 33","citation":{"ama":"Brinkmann M, Meier F, Spedt V, Meier C. Boosting third-order nonlinearities in rutile TiO2 by chromium doping. Optics Express. 2025;33(26). doi:10.1364/oe.572063","ieee":"M. Brinkmann, F. Meier, V. Spedt, and C. Meier, “Boosting third-order nonlinearities in rutile TiO2 by chromium doping,” Optics Express, vol. 33, no. 26, Art. no. 54320, 2025, doi: 10.1364/oe.572063.","chicago":"Brinkmann, Marius, Falco Meier, Vladimir Spedt, and Cedrik Meier. “Boosting Third-Order Nonlinearities in Rutile TiO2 by Chromium Doping.” Optics Express 33, no. 26 (2025). https://doi.org/10.1364/oe.572063.","apa":"Brinkmann, M., Meier, F., Spedt, V., & Meier, C. (2025). Boosting third-order nonlinearities in rutile TiO2 by chromium doping. Optics Express, 33(26), Article 54320. https://doi.org/10.1364/oe.572063","bibtex":"@article{Brinkmann_Meier_Spedt_Meier_2025, title={Boosting third-order nonlinearities in rutile TiO2 by chromium doping}, volume={33}, DOI={10.1364/oe.572063}, number={2654320}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Brinkmann, Marius and Meier, Falco and Spedt, Vladimir and Meier, Cedrik}, year={2025} }","short":"M. Brinkmann, F. Meier, V. Spedt, C. Meier, Optics Express 33 (2025).","mla":"Brinkmann, Marius, et al. “Boosting Third-Order Nonlinearities in Rutile TiO2 by Chromium Doping.” Optics Express, vol. 33, no. 26, 54320, Optica Publishing Group, 2025, doi:10.1364/oe.572063."},"publication_identifier":{"issn":["1094-4087"]},"publication_status":"published","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"\r\n In this study, we investigate the impact of chromium-induced point defects on the nonlinear optical properties and electric-field-induced second harmonic generation (EFISH) in rutile titanium dioxide (TiO\r\n 2\r\n ). Chromium thin films were deposited by electron beam evaporation on (001)-oriented bulk TiO\r\n 2\r\n substrates and subsequently diffused into the lattice in a tube furnace under a nitrogen atmosphere at 900 °C. The introduction of chromium significantly enhanced the third harmonic generation (THG) of a 1560 nm laser, with an amplification factor of up to 8.3, indicative of an enhanced third-order nonlinear susceptibility,\r\n χ\r\n (3)\r\n . Moreover, the application of an external voltage induced a pronounced EFISH signal in the chromium-doped samples, further confirming the enhanced nonlinear response. These results demonstrate that defect engineering via chromium doping in rutile TiO\r\n 2\r\n offers a promising pathway for the development of high-performance nonlinear optical devices.\r\n "}],"publication":"Optics Express","title":"Boosting third-order nonlinearities in rutile TiO2 by chromium doping","publisher":"Optica Publishing Group","date_created":"2026-02-26T09:43:53Z","year":"2025","issue":"26"},{"article_number":"51085","article_type":"original","user_id":"30525","department":[{"_id":"15"},{"_id":"230"},{"_id":"289"},{"_id":"623"}],"_id":"62286","status":"public","type":"journal_article","main_file_link":[{"url":"https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-24-51085","open_access":"1"}],"doi":"10.1364/oe.580201","author":[{"first_name":"Donghao","full_name":"Li, Donghao","last_name":"Li"},{"first_name":"Qiming","full_name":"Liao, Qiming","last_name":"Liao"},{"last_name":"Xu","full_name":"Xu, Beining","first_name":"Beining"},{"full_name":"Zentgraf, Thomas","id":"30525","last_name":"Zentgraf","orcid":"0000-0002-8662-1101","first_name":"Thomas"},{"first_name":"Emmanuel","full_name":"Narvaez Castaneda, Emmanuel","last_name":"Narvaez Castaneda"},{"first_name":"Yaoting","last_name":"Zhou","full_name":"Zhou, Yaoting"},{"first_name":"Keyu","last_name":"Qin","full_name":"Qin, Keyu"},{"last_name":"Xu","full_name":"Xu, Zhongxiao","first_name":"Zhongxiao"},{"full_name":"Shen, Heng","last_name":"Shen","first_name":"Heng"},{"first_name":"Lingling","full_name":"Huang, Lingling","last_name":"Huang"}],"volume":33,"date_updated":"2025-11-24T06:35:19Z","oa":"1","citation":{"apa":"Li, D., Liao, Q., Xu, B., Zentgraf, T., Narvaez Castaneda, E., Zhou, Y., Qin, K., Xu, Z., Shen, H., & Huang, L. (2025). In vacuum metasurface for optical microtrap array. Optics Express, 33(24), Article 51085. https://doi.org/10.1364/oe.580201","short":"D. Li, Q. Liao, B. Xu, T. Zentgraf, E. Narvaez Castaneda, Y. Zhou, K. Qin, Z. Xu, H. Shen, L. Huang, Optics Express 33 (2025).","bibtex":"@article{Li_Liao_Xu_Zentgraf_Narvaez Castaneda_Zhou_Qin_Xu_Shen_Huang_2025, title={In vacuum metasurface for optical microtrap array}, volume={33}, DOI={10.1364/oe.580201}, number={2451085}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Li, Donghao and Liao, Qiming and Xu, Beining and Zentgraf, Thomas and Narvaez Castaneda, Emmanuel and Zhou, Yaoting and Qin, Keyu and Xu, Zhongxiao and Shen, Heng and Huang, Lingling}, year={2025} }","mla":"Li, Donghao, et al. “In Vacuum Metasurface for Optical Microtrap Array.” Optics Express, vol. 33, no. 24, 51085, Optica Publishing Group, 2025, doi:10.1364/oe.580201.","chicago":"Li, Donghao, Qiming Liao, Beining Xu, Thomas Zentgraf, Emmanuel Narvaez Castaneda, Yaoting Zhou, Keyu Qin, Zhongxiao Xu, Heng Shen, and Lingling Huang. “In Vacuum Metasurface for Optical Microtrap Array.” Optics Express 33, no. 24 (2025). https://doi.org/10.1364/oe.580201.","ieee":"D. Li et al., “In vacuum metasurface for optical microtrap array,” Optics Express, vol. 33, no. 24, Art. no. 51085, 2025, doi: 10.1364/oe.580201.","ama":"Li D, Liao Q, Xu B, et al. In vacuum metasurface for optical microtrap array. Optics Express. 2025;33(24). doi:10.1364/oe.580201"},"intvolume":" 33","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Optical tweezer arrays of laser-cooled and individually controlled particles have revolutionized atomic, molecular, and optical physics. They afford exquisite capabilities for applications in quantum simulation of many-body physics, quantum computation, and sensing. Underlying this development is the technical maturity of generating scalable optical beams, enabled by active components and a high numerical aperture objective. However, such a complex combination of bulk optics outside the vacuum chamber is very sensitive to any vibration and drift. Here, we demonstrate the generation of a 3 × 3 static tweezer array with a single chip-scale multifunctional metasurface element in vacuum, replacing the meter-long free space optics. Fluorescence counts on the camera validate the successful trapping of the atomic ensemble array and showcase a promising strategy for integrated photonics with cold atom systems. The introduction of a polarization independent dual-wavelength metasurface significantly enhances fluorescence collection efficiency while reducing experimental complexity. This approach paves the way for scalable neutral atom platforms and offers a compelling route towards the realization of next generation quantum metasurfaces."}],"publication":"Optics Express","title":"In vacuum metasurface for optical microtrap array","date_created":"2025-11-24T06:31:17Z","publisher":"Optica Publishing Group","year":"2025","issue":"24","quality_controlled":"1"},{"abstract":[{"text":"The titanium in-diffused lithium niobate waveguide platform is well-established for reliable prototyping and packaging of many quantum photonic components at room temperature. Nevertheless, compatibility with certain quantum light sources and superconducting detectors requires operation under cryogenic conditions. We characterize alterations in phase-matching and mode guiding of a non-degenerate spontaneous parametric down-conversion process emitting around 1556 nm and 950 nm, under cryogenic conditions. Despite the effects of pyroelectricity and photorefraction, the spectral properties match our theoretical model. Nevertheless, these effects cause small but significant variations within and between cooling cycles. These measurements provide a first benchmark against which other nonlinear photonic integration platforms, such as thin-film lithium niobate, can be compared.","lang":"eng"}],"publication":"Optics Express","language":[{"iso":"eng"}],"year":"2025","issue":"24","title":"Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides","date_created":"2025-11-20T10:35:35Z","publisher":"Optica Publishing Group","status":"public","type":"journal_article","article_number":"50451","article_type":"original","user_id":"49683","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"project":[{"name":"TRR 142; TP C07: Hohlraum-verstärkte Parametrische Fluoreszenz mit zeitlicher Filterung unter Verwendung integrierter supraleitender Detektoren","_id":"171"}],"_id":"62269","citation":{"chicago":"Lange, Nina Amelie, Sebastian Lengeling, Philipp Mues, Viktor Quiring, Werner Ridder, Christof Eigner, Harald Herrmann, Christine Silberhorn, and Tim Bartley. “Widely Non-Degenerate Nonlinear Frequency Conversion in Cryogenic Titanium in-Diffused Lithium Niobate Waveguides.” Optics Express 33, no. 24 (2025). https://doi.org/10.1364/oe.578108.","ieee":"N. A. Lange et al., “Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides,” Optics Express, vol. 33, no. 24, Art. no. 50451, 2025, doi: 10.1364/oe.578108.","ama":"Lange NA, Lengeling S, Mues P, et al. Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides. Optics Express. 2025;33(24). doi:10.1364/oe.578108","apa":"Lange, N. A., Lengeling, S., Mues, P., Quiring, V., Ridder, W., Eigner, C., Herrmann, H., Silberhorn, C., & Bartley, T. (2025). Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides. Optics Express, 33(24), Article 50451. https://doi.org/10.1364/oe.578108","short":"N.A. Lange, S. Lengeling, P. Mues, V. Quiring, W. Ridder, C. Eigner, H. Herrmann, C. Silberhorn, T. Bartley, Optics Express 33 (2025).","bibtex":"@article{Lange_Lengeling_Mues_Quiring_Ridder_Eigner_Herrmann_Silberhorn_Bartley_2025, title={Widely non-degenerate nonlinear frequency conversion in cryogenic titanium in-diffused lithium niobate waveguides}, volume={33}, DOI={10.1364/oe.578108}, number={2450451}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Lange, Nina Amelie and Lengeling, Sebastian and Mues, Philipp and Quiring, Viktor and Ridder, Werner and Eigner, Christof and Herrmann, Harald and Silberhorn, Christine and Bartley, Tim}, year={2025} }","mla":"Lange, Nina Amelie, et al. “Widely Non-Degenerate Nonlinear Frequency Conversion in Cryogenic Titanium in-Diffused Lithium Niobate Waveguides.” Optics Express, vol. 33, no. 24, 50451, Optica Publishing Group, 2025, doi:10.1364/oe.578108."},"intvolume":" 33","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"main_file_link":[{"open_access":"1"}],"doi":"10.1364/oe.578108","author":[{"first_name":"Nina Amelie","id":"56843","full_name":"Lange, Nina Amelie","last_name":"Lange","orcid":"0000-0001-6624-7098"},{"last_name":"Lengeling","full_name":"Lengeling, Sebastian","id":"44373","first_name":"Sebastian"},{"orcid":"0000-0003-0643-7636","last_name":"Mues","full_name":"Mues, Philipp","id":"49772","first_name":"Philipp"},{"first_name":"Viktor","last_name":"Quiring","full_name":"Quiring, Viktor"},{"last_name":"Ridder","full_name":"Ridder, Werner","id":"63574","first_name":"Werner"},{"last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","id":"13244","full_name":"Eigner, Christof","first_name":"Christof"},{"first_name":"Harald","last_name":"Herrmann","full_name":"Herrmann, Harald","id":"216"},{"first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn"},{"full_name":"Bartley, Tim","id":"49683","last_name":"Bartley","first_name":"Tim"}],"volume":33,"oa":"1","date_updated":"2025-12-12T12:13:45Z"},{"abstract":[{"text":"We present the design and characterization of a guided-wave, bright, and highly frequency non-degenerate parametric down-conversion (PDC) source in thin-film lithium niobate. The source generates photon pairs with wavelengths of 815 nm and 1550 nm, linking the visible wavelength regime with telecommunication wavelengths. We confirm the high quality of the generated single photons by determining a value for the heralded second-order correlation function as low as g_h^(2)=(6.7+/-1.1)*10^8-3). Furthermore, we achieve a high spectral brightness of 0.44·10pairs/(smWGHz) which is two orders of magnitude higher than sources based on weakly guiding waveguides. The shape of the PDC spectrum and the strong agreement between the effective and nominal bandwidth highlight our high fabrication quality of periodically poled waveguides. The good agreement between the measured and simulated spectral characteristics of our source demonstrates our excellent understanding of the PDC process. Our result is a valuable step towards practical and scalable quantum communication networks as well as photonic quantum computing.","lang":"eng"}],"publication":"Optics Express","language":[{"iso":"eng"}],"year":"2025","issue":"25","title":"Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths","publisher":"Optica Publishing Group","date_created":"2025-12-15T07:20:36Z","status":"public","type":"journal_article","article_type":"original","article_number":"52729","_id":"63091","user_id":"63231","department":[{"_id":"288"},{"_id":"623"}],"citation":{"ama":"Babel S, Bollmers L, Roeder F, et al. Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express. 2025;33(25). doi:10.1364/oe.571605","ieee":"S. Babel et al., “Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths,” Optics Express, vol. 33, no. 25, Art. no. 52729, 2025, doi: 10.1364/oe.571605.","chicago":"Babel, Silia, Laura Bollmers, Franz Roeder, Werner Ridder, Christian Golla, Ronja Köthemann, Bernhard Reineke, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express 33, no. 25 (2025). https://doi.org/10.1364/oe.571605.","apa":"Babel, S., Bollmers, L., Roeder, F., Ridder, W., Golla, C., Köthemann, R., Reineke, B., Herrmann, H., Brecht, B., Eigner, C., Padberg, L., & Silberhorn, C. (2025). Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths. Optics Express, 33(25), Article 52729. https://doi.org/10.1364/oe.571605","short":"S. Babel, L. Bollmers, F. Roeder, W. Ridder, C. Golla, R. Köthemann, B. Reineke, H. Herrmann, B. Brecht, C. Eigner, L. Padberg, C. Silberhorn, Optics Express 33 (2025).","bibtex":"@article{Babel_Bollmers_Roeder_Ridder_Golla_Köthemann_Reineke_Herrmann_Brecht_Eigner_et al._2025, title={Ultrabright, two-color photon pair source based on thin-film lithium niobate for bridging visible and telecom wavelengths}, volume={33}, DOI={10.1364/oe.571605}, number={2552729}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Babel, Silia and Bollmers, Laura and Roeder, Franz and Ridder, Werner and Golla, Christian and Köthemann, Ronja and Reineke, Bernhard and Herrmann, Harald and Brecht, Benjamin and Eigner, Christof and et al.}, year={2025} }","mla":"Babel, Silia, et al. “Ultrabright, Two-Color Photon Pair Source Based on Thin-Film Lithium Niobate for Bridging Visible and Telecom Wavelengths.” Optics Express, vol. 33, no. 25, 52729, Optica Publishing Group, 2025, doi:10.1364/oe.571605."},"intvolume":" 33","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"main_file_link":[{"open_access":"1","url":"https://opg.optica.org/oe/fulltext.cfm?uri=oe-33-25-52729"}],"doi":"10.1364/oe.571605","date_updated":"2026-01-07T11:28:35Z","oa":"1","author":[{"orcid":"https://orcid.org/0000-0002-1568-2580","last_name":"Babel","full_name":"Babel, Silia","id":"63231","first_name":"Silia"},{"first_name":"Laura","full_name":"Bollmers, Laura","id":"61375","last_name":"Bollmers"},{"last_name":"Roeder","full_name":"Roeder, Franz","id":"88149","first_name":"Franz"},{"first_name":"Werner","id":"63574","full_name":"Ridder, Werner","last_name":"Ridder"},{"first_name":"Christian","last_name":"Golla","id":"40420","full_name":"Golla, Christian"},{"last_name":"Köthemann","full_name":"Köthemann, Ronja","first_name":"Ronja"},{"id":"29821","full_name":"Reineke, Bernhard","last_name":"Reineke","first_name":"Bernhard"},{"last_name":"Herrmann","full_name":"Herrmann, Harald","id":"216","first_name":"Harald"},{"first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","id":"27150","full_name":"Brecht, Benjamin"},{"first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","full_name":"Eigner, Christof","id":"13244"},{"last_name":"Padberg","full_name":"Padberg, Laura","id":"40300","first_name":"Laura"},{"first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn"}],"volume":33},{"citation":{"ama":"Babai-Hemati J, vom Bruch F, Herrmann H, Silberhorn C. Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters. Optics Express. Published online 2024. doi:10.1364/oe.510319","chicago":"Babai-Hemati, Jonas, Felix vom Bruch, Harald Herrmann, and Christine Silberhorn. “Tailored Second Harmonic Generation InTi-Diffused PPLN Waveguides Usingmicro-Heaters.” Optics Express, 2024. https://doi.org/10.1364/oe.510319.","ieee":"J. Babai-Hemati, F. vom Bruch, H. Herrmann, and C. Silberhorn, “Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters,” Optics Express, 2024, doi: 10.1364/oe.510319.","apa":"Babai-Hemati, J., vom Bruch, F., Herrmann, H., & Silberhorn, C. (2024). Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters. Optics Express. https://doi.org/10.1364/oe.510319","short":"J. Babai-Hemati, F. vom Bruch, H. Herrmann, C. Silberhorn, Optics Express (2024).","mla":"Babai-Hemati, Jonas, et al. “Tailored Second Harmonic Generation InTi-Diffused PPLN Waveguides Usingmicro-Heaters.” Optics Express, Optica Publishing Group, 2024, doi:10.1364/oe.510319.","bibtex":"@article{Babai-Hemati_vom Bruch_Herrmann_Silberhorn_2024, title={Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters}, DOI={10.1364/oe.510319}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Babai-Hemati, Jonas and vom Bruch, Felix and Herrmann, Harald and Silberhorn, Christine}, year={2024} }"},"year":"2024","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"doi":"10.1364/oe.510319","title":"Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters","date_created":"2024-02-13T13:03:01Z","author":[{"last_name":"Babai-Hemati","full_name":"Babai-Hemati, Jonas","first_name":"Jonas"},{"full_name":"vom Bruch, Felix","id":"71245","last_name":"vom Bruch","first_name":"Felix"},{"first_name":"Harald","full_name":"Herrmann, Harald","id":"216","last_name":"Herrmann"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"}],"date_updated":"2024-02-13T13:09:51Z","publisher":"Optica Publishing Group","status":"public","type":"journal_article","publication":"Optics Express","language":[{"iso":"eng"}],"keyword":["Atomic and Molecular Physics","and Optics"],"user_id":"216","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266","grant_number":"PROFILNRW-2020-067"}],"_id":"51339"},{"publication_identifier":{"issn":["1094-4087"]},"publication_status":"published","issue":"9","year":"2024","intvolume":" 32","citation":{"short":"S. Yang, X. Liu, H. Zhang, X. Song, R. Zuo, T. Meier, W. Yang, Optics Express 32 (2024).","bibtex":"@article{Yang_Liu_Zhang_Song_Zuo_Meier_Yang_2024, title={Sub-cycle strong-field tunneling dynamics in solids}, volume={32}, DOI={10.1364/oe.521207}, number={915862}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Yang, Shidong and Liu, Xiwang and Zhang, Hongdan and Song, Xiaohong and Zuo, Ruixin and Meier, Torsten and Yang, Weifeng}, year={2024} }","mla":"Yang, Shidong, et al. “Sub-Cycle Strong-Field Tunneling Dynamics in Solids.” Optics Express, vol. 32, no. 9, 15862, Optica Publishing Group, 2024, doi:10.1364/oe.521207.","apa":"Yang, S., Liu, X., Zhang, H., Song, X., Zuo, R., Meier, T., & Yang, W. (2024). Sub-cycle strong-field tunneling dynamics in solids. Optics Express, 32(9), Article 15862. https://doi.org/10.1364/oe.521207","ieee":"S. Yang et al., “Sub-cycle strong-field tunneling dynamics in solids,” Optics Express, vol. 32, no. 9, Art. no. 15862, 2024, doi: 10.1364/oe.521207.","chicago":"Yang, Shidong, Xiwang Liu, Hongdan Zhang, Xiaohong Song, Ruixin Zuo, Torsten Meier, and Weifeng Yang. “Sub-Cycle Strong-Field Tunneling Dynamics in Solids.” Optics Express 32, no. 9 (2024). https://doi.org/10.1364/oe.521207.","ama":"Yang S, Liu X, Zhang H, et al. Sub-cycle strong-field tunneling dynamics in solids. Optics Express. 2024;32(9). doi:10.1364/oe.521207"},"date_updated":"2024-07-15T09:29:23Z","publisher":"Optica Publishing Group","volume":32,"date_created":"2024-07-15T09:25:30Z","author":[{"first_name":"Shidong","full_name":"Yang, Shidong","last_name":"Yang"},{"last_name":"Liu","full_name":"Liu, Xiwang","first_name":"Xiwang"},{"first_name":"Hongdan","last_name":"Zhang","full_name":"Zhang, Hongdan"},{"first_name":"Xiaohong","last_name":"Song","full_name":"Song, Xiaohong"},{"full_name":"Zuo, Ruixin","last_name":"Zuo","first_name":"Ruixin"},{"first_name":"Torsten","full_name":"Meier, Torsten","id":"344","last_name":"Meier","orcid":"0000-0001-8864-2072"},{"full_name":"Yang, Weifeng","last_name":"Yang","first_name":"Weifeng"}],"title":"Sub-cycle strong-field tunneling dynamics in solids","doi":"10.1364/oe.521207","publication":"Optics Express","type":"journal_article","abstract":[{"lang":"eng","text":"Tunneling ionization is a crucial process in the interaction between strong laser fields and matter which initiates numerous nonlinear phenomena including high-order harmonic generation, photoelectron holography, etc. Both adiabatic and nonadiabatic tunneling ionization are well understood in atomic systems. However, the tunneling dynamics in solids, especially nonadiabatic tunneling, has not yet been fully understood. Here, we study the sub-cycle resolved strong-field tunneling dynamics in solids via a complex saddle-point method. We compare the instantaneous momentum at the moment of tunneling and the tunneling distances over a range of Keldysh parameters. Our results demonstrate that for nonadiabatic tunneling, tunneling ionization away from Γ point is possible. When this happens the electron has a nonzero initial velocity when it emerges in the conduction band. Moreover, consistent with atomic tunneling, a reduced tunneling distance as compared to the quasi-static case is found. Our results provide remarkable insight into the basic physics governing the sub-cycle electron tunneling dynamics with significant implications for understanding subsequent strong-field nonlinear phenomena in solids."}],"status":"public","_id":"55264","department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"230"},{"_id":"35"}],"user_id":"16199","article_number":"15862","language":[{"iso":"eng"}]},{"year":"2024","issue":"13","title":"Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides","publisher":"Optica Publishing Group","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."}],"file":[{"date_updated":"2024-06-10T11:25:00Z","date_created":"2024-06-10T11:25:00Z","creator":"fossie","file_size":4004782,"file_name":"2024-06 Hammer - Optics Express - Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides.pdf","file_id":"54669","access_level":"open_access","content_type":"application/pdf","relation":"main_file"}],"publication":"Optics Express","keyword":["tet_topic_waveguide"],"ddc":["530"],"language":[{"iso":"eng"}],"page":"22878","intvolume":" 32","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.” Optics Express 32, no. 13 (2024): 22878. https://doi.org/10.1364/oe.521766.","ieee":"M. Hammer et al., “Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides,” Optics Express, vol. 32, no. 13, p. 22878, 2024, doi: 10.1364/oe.521766.","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. Optics Express. 2024;32(13):22878. doi:10.1364/oe.521766","apa":"Hammer, M., Babel, S., Farheen, H., Padberg, L., Scheytt, J. C., Silberhorn, C., & Förstner, J. (2024). Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides. Optics Express, 32(13), 22878. https://doi.org/10.1364/oe.521766","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={10.1364/oe.521766}, 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} }","mla":"Hammer, Manfred, et al. “Estimation of Losses Caused by Sidewall Roughness in Thin-Film Lithium Niobate Rib and Strip Waveguides.” Optics Express, vol. 32, no. 13, Optica Publishing Group, 2024, p. 22878, doi:10.1364/oe.521766.","short":"M. Hammer, S. Babel, H. Farheen, L. Padberg, J.C. Scheytt, C. Silberhorn, J. Förstner, Optics Express 32 (2024) 22878."},"has_accepted_license":"1","publication_identifier":{"issn":["1094-4087"]},"publication_status":"published","doi":"10.1364/oe.521766","date_updated":"2024-07-22T07:43:02Z","oa":"1","volume":32,"author":[{"full_name":"Hammer, Manfred","id":"48077","orcid":"0000-0002-6331-9348","last_name":"Hammer","first_name":"Manfred"},{"id":"63231","full_name":"Babel, Silia","last_name":"Babel","orcid":"https://orcid.org/0000-0002-1568-2580","first_name":"Silia"},{"last_name":"Farheen","orcid":"0000-0001-7730-3489","full_name":"Farheen, Henna","id":"53444","first_name":"Henna"},{"last_name":"Padberg","id":"40300","full_name":"Padberg, Laura","first_name":"Laura"},{"orcid":"0000-0002-5950-6618 ","last_name":"Scheytt","full_name":"Scheytt, J. Christoph","id":"37144","first_name":"J. Christoph"},{"first_name":"Christine","last_name":"Silberhorn","id":"26263","full_name":"Silberhorn, Christine"},{"last_name":"Förstner","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","id":"158","first_name":"Jens"}],"status":"public","type":"journal_article","file_date_updated":"2024-06-10T11:25:00Z","_id":"54668","project":[{"_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","grant_number":"231447078"},{"name":"TRR 142 - C11: TRR 142 - Kompakte Photonenpaar-Quelle mit ultraschnellen Modulatoren auf Basis von CMOS und LNOI (C11*)","_id":"175","grant_number":"231447078"},{"name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)","_id":"167","grant_number":"231447078"},{"grant_number":"PROFILNRW-2020-067","name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266"}],"department":[{"_id":"61"},{"_id":"429"},{"_id":"623"},{"_id":"263"},{"_id":"288"}],"user_id":"158"},{"title":"Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides","doi":"10.1364/oe.538741","date_updated":"2026-02-20T11:14:32Z","publisher":"Optica Publishing Group","date_created":"2026-02-20T11:10:34Z","author":[{"first_name":"Leon","full_name":"Zens, Leon","last_name":"Zens"},{"full_name":"Besaga, Vira","last_name":"Besaga","first_name":"Vira"},{"first_name":"Jens","full_name":"Möller, Jens","last_name":"Möller"},{"first_name":"Nils Christopher","full_name":"Gerhardt, Nils Christopher","id":"115298","orcid":"0009-0002-5538-231X","last_name":"Gerhardt"},{"first_name":"Martin","last_name":"Hofmann","full_name":"Hofmann, Martin"}],"year":"2024","citation":{"ama":"Zens L, Besaga V, Möller J, Gerhardt NC, Hofmann M. Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides. Optics Express. Published online 2024. doi:10.1364/oe.538741","chicago":"Zens, Leon, Vira Besaga, Jens Möller, Nils Christopher Gerhardt, and Martin Hofmann. “Holographic Measurement of Gain and Linewidth Enhancement Factor in Semiconductor Waveguides.” Optics Express, 2024. https://doi.org/10.1364/oe.538741.","ieee":"L. Zens, V. Besaga, J. Möller, N. C. Gerhardt, and M. Hofmann, “Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides,” Optics Express, 2024, doi: 10.1364/oe.538741.","apa":"Zens, L., Besaga, V., Möller, J., Gerhardt, N. C., & Hofmann, M. (2024). Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides. Optics Express. https://doi.org/10.1364/oe.538741","short":"L. Zens, V. Besaga, J. Möller, N.C. Gerhardt, M. Hofmann, Optics Express (2024).","bibtex":"@article{Zens_Besaga_Möller_Gerhardt_Hofmann_2024, title={Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides}, DOI={10.1364/oe.538741}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Zens, Leon and Besaga, Vira and Möller, Jens and Gerhardt, Nils Christopher and Hofmann, Martin}, year={2024} }","mla":"Zens, Leon, et al. “Holographic Measurement of Gain and Linewidth Enhancement Factor in Semiconductor Waveguides.” Optics Express, Optica Publishing Group, 2024, doi:10.1364/oe.538741."},"publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"language":[{"iso":"eng"}],"_id":"64550","user_id":"15911","department":[{"_id":"977"}],"status":"public","type":"journal_article","publication":"Optics Express"},{"publication_identifier":{"issn":["1094-4087"]},"publication_status":"published","citation":{"apa":"Zens, L., Besaga, V., Möller, J., Gerhardt, N. C., & Hofmann, M. (2024). Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides. Optics Express. https://doi.org/10.1364/oe.538741","short":"L. Zens, V. Besaga, J. Möller, N.C. Gerhardt, M. Hofmann, Optics Express (2024).","bibtex":"@article{Zens_Besaga_Möller_Gerhardt_Hofmann_2024, title={Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides}, DOI={10.1364/oe.538741}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Zens, Leon and Besaga, Vira and Möller, Jens and Gerhardt, Nils Christopher and Hofmann, Martin}, year={2024} }","mla":"Zens, Leon, et al. “Holographic Measurement of Gain and Linewidth Enhancement Factor in Semiconductor Waveguides.” Optics Express, Optica Publishing Group, 2024, doi:10.1364/oe.538741.","ama":"Zens L, Besaga V, Möller J, Gerhardt NC, Hofmann M. Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides. Optics Express. Published online 2024. doi:10.1364/oe.538741","ieee":"L. Zens, V. Besaga, J. Möller, N. C. Gerhardt, and M. Hofmann, “Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides,” Optics Express, 2024, doi: 10.1364/oe.538741.","chicago":"Zens, Leon, Vira Besaga, Jens Möller, Nils Christopher Gerhardt, and Martin Hofmann. “Holographic Measurement of Gain and Linewidth Enhancement Factor in Semiconductor Waveguides.” Optics Express, 2024. https://doi.org/10.1364/oe.538741."},"year":"2024","author":[{"full_name":"Zens, Leon","last_name":"Zens","first_name":"Leon"},{"full_name":"Besaga, Vira","last_name":"Besaga","first_name":"Vira"},{"first_name":"Jens","full_name":"Möller, Jens","last_name":"Möller"},{"first_name":"Nils Christopher","orcid":"0009-0002-5538-231X","last_name":"Gerhardt","id":"115298","full_name":"Gerhardt, Nils Christopher"},{"first_name":"Martin","full_name":"Hofmann, Martin","last_name":"Hofmann"}],"date_created":"2026-02-20T11:09:40Z","publisher":"Optica Publishing Group","date_updated":"2026-02-23T13:06:50Z","doi":"10.1364/oe.538741","title":"Holographic measurement of gain and linewidth enhancement factor in semiconductor waveguides","publication":"Optics Express","type":"journal_article","status":"public","department":[{"_id":"977"}],"user_id":"15911","_id":"64549","language":[{"iso":"eng"}]},{"citation":{"apa":"Bhattacharjee, A., Folge, P. F., Serino, L. M., Řeháček, J., Hradil, Z., Silberhorn, C., & Brecht, B. (2024). Pulse characterization at the single-photon level through chronocyclic Q-function measurements. Optics Express, 33(3), Article 5551. https://doi.org/10.1364/oe.540125","bibtex":"@article{Bhattacharjee_Folge_Serino_Řeháček_Hradil_Silberhorn_Brecht_2024, title={Pulse characterization at the single-photon level through chronocyclic Q-function measurements}, volume={33}, DOI={10.1364/oe.540125}, number={35551}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Bhattacharjee, Abhinandan and Folge, Patrick Fabian and Serino, Laura Maria and Řeháček, Jaroslav and Hradil, Zdeněk and Silberhorn, Christine and Brecht, Benjamin}, year={2024} }","mla":"Bhattacharjee, Abhinandan, et al. “Pulse Characterization at the Single-Photon Level through Chronocyclic Q-Function Measurements.” Optics Express, vol. 33, no. 3, 5551, Optica Publishing Group, 2024, doi:10.1364/oe.540125.","short":"A. Bhattacharjee, P.F. Folge, L.M. Serino, J. Řeháček, Z. Hradil, C. Silberhorn, B. Brecht, Optics Express 33 (2024).","ama":"Bhattacharjee A, Folge PF, Serino LM, et al. Pulse characterization at the single-photon level through chronocyclic Q-function measurements. Optics Express. 2024;33(3). doi:10.1364/oe.540125","ieee":"A. Bhattacharjee et al., “Pulse characterization at the single-photon level through chronocyclic Q-function measurements,” Optics Express, vol. 33, no. 3, Art. no. 5551, 2024, doi: 10.1364/oe.540125.","chicago":"Bhattacharjee, Abhinandan, Patrick Fabian Folge, Laura Maria Serino, Jaroslav Řeháček, Zdeněk Hradil, Christine Silberhorn, and Benjamin Brecht. “Pulse Characterization at the Single-Photon Level through Chronocyclic Q-Function Measurements.” Optics Express 33, no. 3 (2024). https://doi.org/10.1364/oe.540125."},"intvolume":" 33","year":"2024","issue":"3","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"doi":"10.1364/oe.540125","title":"Pulse characterization at the single-photon level through chronocyclic Q-function measurements","date_created":"2025-12-18T16:08:16Z","author":[{"first_name":"Abhinandan","id":"95902","full_name":"Bhattacharjee, Abhinandan","last_name":"Bhattacharjee"},{"first_name":"Patrick Fabian","id":"88605","full_name":"Folge, Patrick Fabian","last_name":"Folge"},{"id":"88242","full_name":"Serino, Laura Maria","last_name":"Serino","first_name":"Laura Maria"},{"last_name":"Řeháček","full_name":"Řeháček, Jaroslav","first_name":"Jaroslav"},{"last_name":"Hradil","full_name":"Hradil, Zdeněk","first_name":"Zdeněk"},{"full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn","first_name":"Christine"},{"first_name":"Benjamin","id":"27150","full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht"}],"volume":33,"publisher":"Optica Publishing Group","date_updated":"2025-12-18T16:08:40Z","status":"public","abstract":[{"text":"The characterization of the complex spectral amplitude, that is, the spectrum and spectral phase, of single-photon-level light fields is a crucial capability for modern photonic quantum technologies. Since established pulse characterization techniques are not applicable at low intensities, alternative approaches are required. Here, we demonstrate the retrieval of the complex spectral amplitude of single-photon-level light pulses through measuring their chronocyclic Q −function. Our approach draws inspiration from quantum state tomography by exploiting the analogy between quadrature phase space and time-frequency phase space. In the experiment, we perform time-frequency projections with a quantum pulse gate (QPG), which directly yield the chronocyclic Q −function. We evaluate the complex spectral amplitude from the measured chronocyclic Q −function data with maximum likelihood estimation (MLE), which is the established technique for quantum state tomography. The MLE yields not only an unambigious estimate of the complex spectral amplitude of the state under test that does not require any a priori information, but also allows for, in principle, estimating the spectral-temporal coherence properties of the state. Our method accurately recovers features such as jumps in the spectral phase and is resistant against regions with zero spectral intensity, which makes it immediately beneficial for classical pulse characterization problems.","lang":"eng"}],"type":"journal_article","publication":"Optics Express","language":[{"iso":"eng"}],"article_number":"5551","user_id":"27150","department":[{"_id":"15"},{"_id":"623"}],"_id":"63216"},{"issue":"3","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"citation":{"ama":"Serino LM, Eigner C, Brecht B, Silberhorn C. Programmable time-frequency mode-sorting of single photons with a multi-output quantum pulse gate. Optics Express. 2024;33(3). doi:10.1364/oe.544206","chicago":"Serino, Laura Maria, Christof Eigner, Benjamin Brecht, and Christine Silberhorn. “Programmable Time-Frequency Mode-Sorting of Single Photons with a Multi-Output Quantum Pulse Gate.” Optics Express 33, no. 3 (2024). https://doi.org/10.1364/oe.544206.","ieee":"L. M. Serino, C. Eigner, B. Brecht, and C. Silberhorn, “Programmable time-frequency mode-sorting of single photons with a multi-output quantum pulse gate,” Optics Express, vol. 33, no. 3, Art. no. 5577, 2024, doi: 10.1364/oe.544206.","mla":"Serino, Laura Maria, et al. “Programmable Time-Frequency Mode-Sorting of Single Photons with a Multi-Output Quantum Pulse Gate.” Optics Express, vol. 33, no. 3, 5577, Optica Publishing Group, 2024, doi:10.1364/oe.544206.","short":"L.M. Serino, C. Eigner, B. Brecht, C. Silberhorn, Optics Express 33 (2024).","bibtex":"@article{Serino_Eigner_Brecht_Silberhorn_2024, title={Programmable time-frequency mode-sorting of single photons with a multi-output quantum pulse gate}, volume={33}, DOI={10.1364/oe.544206}, number={35577}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Serino, Laura Maria and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }","apa":"Serino, L. M., Eigner, C., Brecht, B., & Silberhorn, C. (2024). Programmable time-frequency mode-sorting of single photons with a multi-output quantum pulse gate. Optics Express, 33(3), Article 5577. https://doi.org/10.1364/oe.544206"},"intvolume":" 33","year":"2024","date_created":"2025-12-18T16:09:22Z","author":[{"full_name":"Serino, Laura Maria","id":"88242","last_name":"Serino","first_name":"Laura Maria"},{"first_name":"Christof","id":"13244","full_name":"Eigner, Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner"},{"first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","id":"27150","full_name":"Brecht, Benjamin"},{"first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263"}],"volume":33,"date_updated":"2025-12-18T16:09:44Z","publisher":"Optica Publishing Group","doi":"10.1364/oe.544206","title":"Programmable time-frequency mode-sorting of single photons with a multi-output quantum pulse gate","type":"journal_article","publication":"Optics Express","status":"public","abstract":[{"lang":"eng","text":"We demonstrate a high-dimensional mode-sorter for single photons based on a multi-output quantum pulse gate, which we can program to switch between different temporal-mode encodings including pulse modes, frequency bins, time bins, and their superpositions. This device can facilitate practical realizations of quantum information applications such as high-dimensional quantum key distribution and thus enables secure communication with enhanced information capacity. We characterize the mode-sorter through a detector tomography in 3 and 5 dimensions and find a fidelity up to 0.958 ± 0.030 at the single-photon level."}],"user_id":"27150","department":[{"_id":"15"},{"_id":"623"}],"_id":"63217","language":[{"iso":"eng"}],"article_number":"5577"},{"article_number":"23945","article_type":"original","user_id":"78890","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"_id":"54815","status":"public","type":"journal_article","doi":"10.1364/oe.522549","author":[{"id":"78890","full_name":"Pollmann, René","last_name":"Pollmann","first_name":"René"},{"first_name":"Franz","last_name":"Roeder","id":"88149","full_name":"Roeder, Franz"},{"last_name":"Quiring","full_name":"Quiring, Victor","first_name":"Victor"},{"full_name":"Ricken, Raimund","last_name":"Ricken","first_name":"Raimund"},{"orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","id":"13244","full_name":"Eigner, Christof","first_name":"Christof"},{"last_name":"Brecht","orcid":"0000-0003-4140-0556 ","id":"27150","full_name":"Brecht, Benjamin","first_name":"Benjamin"},{"first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn"}],"volume":32,"date_updated":"2025-12-19T11:37:41Z","citation":{"ama":"Pollmann R, Roeder F, Quiring V, et al. Integrated, bright broadband, two-colour parametric down-conversion source. Optics Express. 2024;32(14). doi:10.1364/oe.522549","chicago":"Pollmann, René, Franz Roeder, Victor Quiring, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn. “Integrated, Bright Broadband, Two-Colour Parametric down-Conversion Source.” Optics Express 32, no. 14 (2024). https://doi.org/10.1364/oe.522549.","ieee":"R. Pollmann et al., “Integrated, bright broadband, two-colour parametric down-conversion source,” Optics Express, vol. 32, no. 14, Art. no. 23945, 2024, doi: 10.1364/oe.522549.","bibtex":"@article{Pollmann_Roeder_Quiring_Ricken_Eigner_Brecht_Silberhorn_2024, title={Integrated, bright broadband, two-colour parametric down-conversion source}, volume={32}, DOI={10.1364/oe.522549}, number={1423945}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Pollmann, René and Roeder, Franz and Quiring, Victor and Ricken, Raimund and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }","mla":"Pollmann, René, et al. “Integrated, Bright Broadband, Two-Colour Parametric down-Conversion Source.” Optics Express, vol. 32, no. 14, 23945, Optica Publishing Group, 2024, doi:10.1364/oe.522549.","short":"R. Pollmann, F. Roeder, V. Quiring, R. Ricken, C. Eigner, B. Brecht, C. Silberhorn, Optics Express 32 (2024).","apa":"Pollmann, R., Roeder, F., Quiring, V., Ricken, R., Eigner, C., Brecht, B., & Silberhorn, C. (2024). Integrated, bright broadband, two-colour parametric down-conversion source. Optics Express, 32(14), Article 23945. https://doi.org/10.1364/oe.522549"},"intvolume":" 32","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"language":[{"iso":"eng"}],"abstract":[{"text":"Broadband quantum light is a vital resource for quantum metrology and spectroscopy applications such as quantum optical coherence tomography or entangled two photon absorption. For entangled two photon absorption in particular, very high photon flux combined with high time-frequency entanglement is crucial for observing a signal. So far these conditions could be met by using high power lasers driving degenerate, type 0 bulk-crystal spontaneous parametric down conversion (SPDC) sources. This naturally limits the available wavelength ranges and precludes deterministic splitting of the generated output photons. In this work we demonstrate an integrated two-colour SPDC source utilising a group-velocity matched lithium niobate waveguide, reaching both exceptional brightness 1.52⋅106pairssmWGHz and large bandwidth (7.8 THz FWHM) while pumped with a few mW of continuous wave (CW) laser light. By converting a narrow band pump to broadband pulses the created photon pairs show correlation times of Δτ ≈ 120 fs while maintaining the narrow bandwidth Δω\r\n p\r\n ≪ 1 MHz of the CW pump light, yielding strong time-frequency entanglement. Furthermore our process can be adapted to a wide range of central wavelengths.","lang":"eng"}],"publication":"Optics Express","title":"Integrated, bright broadband, two-colour parametric down-conversion source","date_created":"2024-06-19T06:58:17Z","publisher":"Optica Publishing Group","year":"2024","issue":"14"},{"keyword":["Atomic and Molecular Physics","and Optics"],"language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"We report a titanium indiffused waveguide resonator featuring an integrated electro-optic modulator for cavity length stabilisation that produces close to 5 dB of squeezed light at 1550 nm (2.4 dB directly measured). The resonator is locked on resonance for tens of minutes with 70 mW of SH light incident on the cavity, demonstrating that photorefraction can be mitigated. Squeezed light production concurrent with cavity length stabilisation utilising the integrated EOM is demonstrated. The device demonstrates the suitability of this platform for squeezed light generation in network applications, where stabilisation to the reference field is typically necessary."}],"publication":"Optics Express","title":"Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications","publisher":"Optica Publishing Group","date_created":"2023-10-19T14:22:59Z","year":"2023","issue":"21","article_number":"34903","_id":"48349","user_id":"42777","department":[{"_id":"288"},{"_id":"623"}],"status":"public","type":"journal_article","doi":"10.1364/oe.498423","date_updated":"2023-11-02T09:26:42Z","author":[{"last_name":"Stefszky","full_name":"Stefszky, M.","first_name":"M."},{"last_name":"vom Bruch","full_name":"vom Bruch, F.","first_name":"F."},{"first_name":"M.","last_name":"Santandrea","full_name":"Santandrea, M."},{"first_name":"R.","full_name":"Ricken, R.","last_name":"Ricken"},{"full_name":"Quiring, V.","last_name":"Quiring","first_name":"V."},{"first_name":"C.","full_name":"Eigner, C.","last_name":"Eigner"},{"first_name":"H","full_name":"Herrmann, H","last_name":"Herrmann"},{"full_name":"Silberhorn, C","last_name":"Silberhorn","first_name":"C"}],"volume":31,"citation":{"short":"M. Stefszky, F. vom Bruch, M. Santandrea, R. Ricken, V. Quiring, C. Eigner, H. Herrmann, C. Silberhorn, Optics Express 31 (2023).","bibtex":"@article{Stefszky_vom Bruch_Santandrea_Ricken_Quiring_Eigner_Herrmann_Silberhorn_2023, title={Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications}, volume={31}, DOI={10.1364/oe.498423}, number={2134903}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Stefszky, M. and vom Bruch, F. and Santandrea, M. and Ricken, R. and Quiring, V. and Eigner, C. and Herrmann, H and Silberhorn, C}, year={2023} }","mla":"Stefszky, M., et al. “Lithium Niobate Waveguide Squeezer with Integrated Cavity Length Stabilisation for Network Applications.” Optics Express, vol. 31, no. 21, 34903, Optica Publishing Group, 2023, doi:10.1364/oe.498423.","apa":"Stefszky, M., vom Bruch, F., Santandrea, M., Ricken, R., Quiring, V., Eigner, C., Herrmann, H., & Silberhorn, C. (2023). Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications. Optics Express, 31(21), Article 34903. https://doi.org/10.1364/oe.498423","ama":"Stefszky M, vom Bruch F, Santandrea M, et al. Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications. Optics Express. 2023;31(21). doi:10.1364/oe.498423","chicago":"Stefszky, M., F. vom Bruch, M. Santandrea, R. Ricken, V. Quiring, C. Eigner, H Herrmann, and C Silberhorn. “Lithium Niobate Waveguide Squeezer with Integrated Cavity Length Stabilisation for Network Applications.” Optics Express 31, no. 21 (2023). https://doi.org/10.1364/oe.498423.","ieee":"M. Stefszky et al., “Lithium niobate waveguide squeezer with integrated cavity length stabilisation for network applications,” Optics Express, vol. 31, no. 21, Art. no. 34903, 2023, doi: 10.1364/oe.498423."},"intvolume":" 31","publication_status":"published","publication_identifier":{"issn":["1094-4087"]}},{"status":"public","abstract":[{"lang":"eng","text":"Quantum photonic processing via electro-optic components typically requires electronic links across different operation environments, especially when interfacing cryogenic components such as superconducting single photon detectors with room-temperature control and readout electronics. However, readout and driving electronics can introduce detrimental parasitic effects. Here we show an all-optical control and readout of a superconducting nanowire single photon detector (SNSPD), completely electrically decoupled from room temperature electronics. We provide the operation power for the superconducting detector via a cryogenic photodiode, and readout single photon detection signals via a cryogenic electro-optic modulator in the same cryostat. This method opens the possibility for control and readout of superconducting circuits, and feedforward for photonic quantum computing."}],"publication":"Optics Express","type":"journal_article","language":[{"iso":"eng"}],"keyword":["Atomic and Molecular Physics","and Optics"],"article_number":"32717","user_id":"50819","_id":"48399","intvolume":" 31","citation":{"ieee":"F. Thiele et al., “All optical operation of a superconducting photonic interface,” Optics Express, vol. 31, no. 20, Art. no. 32717, 2023, doi: 10.1364/oe.492035.","chicago":"Thiele, Frederik, Thomas Hummel, Adam N. McCaughan, Julian Brockmeier, Maximilian Protte, Victor Quiring, Sebastian Lengeling, Christof Eigner, Christine Silberhorn, and Tim Bartley. “All Optical Operation of a Superconducting Photonic Interface.” Optics Express 31, no. 20 (2023). https://doi.org/10.1364/oe.492035.","ama":"Thiele F, Hummel T, McCaughan AN, et al. All optical operation of a superconducting photonic interface. Optics Express. 2023;31(20). doi:10.1364/oe.492035","apa":"Thiele, F., Hummel, T., McCaughan, A. N., Brockmeier, J., Protte, M., Quiring, V., Lengeling, S., Eigner, C., Silberhorn, C., & Bartley, T. (2023). All optical operation of a superconducting photonic interface. Optics Express, 31(20), Article 32717. https://doi.org/10.1364/oe.492035","short":"F. Thiele, T. Hummel, A.N. McCaughan, J. Brockmeier, M. Protte, V. Quiring, S. Lengeling, C. Eigner, C. Silberhorn, T. Bartley, Optics Express 31 (2023).","bibtex":"@article{Thiele_Hummel_McCaughan_Brockmeier_Protte_Quiring_Lengeling_Eigner_Silberhorn_Bartley_2023, title={All optical operation of a superconducting photonic interface}, volume={31}, DOI={10.1364/oe.492035}, number={2032717}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Thiele, Frederik and Hummel, Thomas and McCaughan, Adam N. and Brockmeier, Julian and Protte, Maximilian and Quiring, Victor and Lengeling, Sebastian and Eigner, Christof and Silberhorn, Christine and Bartley, Tim}, year={2023} }","mla":"Thiele, Frederik, et al. “All Optical Operation of a Superconducting Photonic Interface.” Optics Express, vol. 31, no. 20, 32717, Optica Publishing Group, 2023, doi:10.1364/oe.492035."},"year":"2023","issue":"20","publication_identifier":{"issn":["1094-4087"]},"publication_status":"published","doi":"10.1364/oe.492035","title":"All optical operation of a superconducting photonic interface","volume":31,"date_created":"2023-10-24T06:43:16Z","author":[{"orcid":"0000-0003-0663-5587","last_name":"Thiele","full_name":"Thiele, Frederik","id":"50819","first_name":"Frederik"},{"first_name":"Thomas","last_name":"Hummel","full_name":"Hummel, Thomas","id":"83846"},{"first_name":"Adam N.","full_name":"McCaughan, Adam N.","last_name":"McCaughan"},{"full_name":"Brockmeier, Julian","id":"44807","last_name":"Brockmeier","first_name":"Julian"},{"id":"46170","full_name":"Protte, Maximilian","last_name":"Protte","first_name":"Maximilian"},{"first_name":"Victor","full_name":"Quiring, Victor","last_name":"Quiring"},{"last_name":"Lengeling","id":"44373","full_name":"Lengeling, Sebastian","first_name":"Sebastian"},{"id":"13244","full_name":"Eigner, Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","first_name":"Christof"},{"last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263","first_name":"Christine"},{"id":"49683","full_name":"Bartley, Tim","last_name":"Bartley","first_name":"Tim"}],"date_updated":"2023-11-27T08:43:33Z","publisher":"Optica Publishing Group"},{"type":"journal_article","publication":"Optics Express","abstract":[{"text":"Since high-order harmonic generation (HHG) from atoms depends sensitively on the polarization of the driving laser field, the polarization gating (PG) technique was developed and applied successfully to generate isolated attosecond pulses from atomic gases. The situation is, however, different in solid-state systems as it has been demonstrated that due to collisions with neighboring atomic cores of the crystal lattice strong HHG can be generated even by elliptically- and circularly-polarized laser fields. Here we apply PG to solid-state systems and find that the conventional PG technique is inefficient for the generation of isolated ultrashort harmonic pulse bursts. In contrast, we demonstrate that a polarization-skewed laser pulse is able to confine the harmonic emission to a time window of less than one-tenth of the laser cycle. This method provides a novel way to control HHG and to generate isolated attosecond pulses in solids.","lang":"eng"}],"status":"public","project":[{"_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","grant_number":"231447078"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"grant_number":"231447078","_id":"165","name":"TRR 142 - A10: TRR 142 - Nichtlinearitäten von atomar dünnen Übergangsmetall-Dichalkogeniden in starken Feldern (A10*)"}],"_id":"45704","user_id":"16199","department":[{"_id":"15"},{"_id":"170"},{"_id":"293"},{"_id":"35"},{"_id":"230"},{"_id":"429"}],"article_number":"18862","keyword":["Atomic and Molecular Physics","and Optics"],"language":[{"iso":"eng"}],"publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"issue":"12","year":"2023","citation":{"chicago":"Song, Xiaohong, Shidong Yang, Guifang Wang, Jianpeng Lin, Liang Wang, Torsten Meier, and Weifeng Yang. “Control of the Electron Dynamics in Solid-State High Harmonic Generation on Ultrafast Time Scales by a Polarization-Skewed Laser Pulse.” Optics Express 31, no. 12 (2023). https://doi.org/10.1364/oe.491418.","ieee":"X. Song et al., “Control of the electron dynamics in solid-state high harmonic generation on ultrafast time scales by a polarization-skewed laser pulse,” Optics Express, vol. 31, no. 12, Art. no. 18862, 2023, doi: 10.1364/oe.491418.","ama":"Song X, Yang S, Wang G, et al. Control of the electron dynamics in solid-state high harmonic generation on ultrafast time scales by a polarization-skewed laser pulse. Optics Express. 2023;31(12). doi:10.1364/oe.491418","bibtex":"@article{Song_Yang_Wang_Lin_Wang_Meier_Yang_2023, title={Control of the electron dynamics in solid-state high harmonic generation on ultrafast time scales by a polarization-skewed laser pulse}, volume={31}, DOI={10.1364/oe.491418}, number={1218862}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Song, Xiaohong and Yang, Shidong and Wang, Guifang and Lin, Jianpeng and Wang, Liang and Meier, Torsten and Yang, Weifeng}, year={2023} }","short":"X. Song, S. Yang, G. Wang, J. Lin, L. Wang, T. Meier, W. Yang, Optics Express 31 (2023).","mla":"Song, Xiaohong, et al. “Control of the Electron Dynamics in Solid-State High Harmonic Generation on Ultrafast Time Scales by a Polarization-Skewed Laser Pulse.” Optics Express, vol. 31, no. 12, 18862, Optica Publishing Group, 2023, doi:10.1364/oe.491418.","apa":"Song, X., Yang, S., Wang, G., Lin, J., Wang, L., Meier, T., & Yang, W. (2023). Control of the electron dynamics in solid-state high harmonic generation on ultrafast time scales by a polarization-skewed laser pulse. Optics Express, 31(12), Article 18862. https://doi.org/10.1364/oe.491418"},"intvolume":" 31","publisher":"Optica Publishing Group","date_updated":"2023-06-21T09:56:31Z","author":[{"first_name":"Xiaohong","full_name":"Song, Xiaohong","last_name":"Song"},{"first_name":"Shidong","full_name":"Yang, Shidong","last_name":"Yang"},{"last_name":"Wang","full_name":"Wang, Guifang","first_name":"Guifang"},{"full_name":"Lin, Jianpeng","last_name":"Lin","first_name":"Jianpeng"},{"first_name":"Liang","last_name":"Wang","full_name":"Wang, Liang"},{"first_name":"Torsten","orcid":"0000-0001-8864-2072","last_name":"Meier","id":"344","full_name":"Meier, Torsten"},{"first_name":"Weifeng","last_name":"Yang","full_name":"Yang, Weifeng"}],"date_created":"2023-06-21T09:55:18Z","volume":31,"title":"Control of the electron dynamics in solid-state high harmonic generation on ultrafast time scales by a polarization-skewed laser pulse","doi":"10.1364/oe.491418"},{"issue":"14","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"citation":{"ieee":"S. Babel et al., “Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler,” Optics Express, vol. 31, no. 14, Art. no. 23140, 2023, doi: 10.1364/oe.484126.","chicago":"Babel, Silia, Laura Bollmers, Marcello Massaro, Kai Hong Luo, Michael Stefszky, Federico Pegoraro, Philip Held, et al. “Demonstration of Hong-Ou-Mandel Interference in an LNOI Directional Coupler.” Optics Express 31, no. 14 (2023). https://doi.org/10.1364/oe.484126.","ama":"Babel S, Bollmers L, Massaro M, et al. Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler. Optics Express. 2023;31(14). doi:10.1364/oe.484126","apa":"Babel, S., Bollmers, L., Massaro, M., Luo, K. H., Stefszky, M., Pegoraro, F., Held, P., Herrmann, H., Eigner, C., Brecht, B., Padberg, L., & Silberhorn, C. (2023). Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler. Optics Express, 31(14), Article 23140. https://doi.org/10.1364/oe.484126","bibtex":"@article{Babel_Bollmers_Massaro_Luo_Stefszky_Pegoraro_Held_Herrmann_Eigner_Brecht_et al._2023, title={Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler}, volume={31}, DOI={10.1364/oe.484126}, number={1423140}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Babel, Silia and Bollmers, Laura and Massaro, Marcello and Luo, Kai Hong and Stefszky, Michael and Pegoraro, Federico and Held, Philip and Herrmann, Harald and Eigner, Christof and Brecht, Benjamin and et al.}, year={2023} }","mla":"Babel, Silia, et al. “Demonstration of Hong-Ou-Mandel Interference in an LNOI Directional Coupler.” Optics Express, vol. 31, no. 14, 23140, Optica Publishing Group, 2023, doi:10.1364/oe.484126.","short":"S. Babel, L. Bollmers, M. Massaro, K.H. Luo, M. Stefszky, F. Pegoraro, P. Held, H. Herrmann, C. Eigner, B. Brecht, L. Padberg, C. Silberhorn, Optics Express 31 (2023)."},"intvolume":" 31","year":"2023","date_created":"2023-07-03T14:08:36Z","author":[{"full_name":"Babel, Silia","id":"63231","last_name":"Babel","orcid":"https://orcid.org/0000-0002-1568-2580","first_name":"Silia"},{"last_name":"Bollmers","id":"61375","full_name":"Bollmers, Laura","first_name":"Laura"},{"full_name":"Massaro, Marcello","id":"59545","last_name":"Massaro","orcid":"0000-0002-2539-7652","first_name":"Marcello"},{"first_name":"Kai Hong","full_name":"Luo, Kai Hong","id":"36389","last_name":"Luo","orcid":"0000-0003-1008-4976"},{"id":"42777","full_name":"Stefszky, Michael","last_name":"Stefszky","first_name":"Michael"},{"full_name":"Pegoraro, Federico","id":"88928","last_name":"Pegoraro","first_name":"Federico"},{"id":"68236","full_name":"Held, Philip","last_name":"Held","first_name":"Philip"},{"first_name":"Harald","full_name":"Herrmann, Harald","id":"216","last_name":"Herrmann"},{"first_name":"Christof","id":"13244","full_name":"Eigner, Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083"},{"first_name":"Benjamin","id":"27150","full_name":"Brecht, Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 "},{"first_name":"Laura","last_name":"Padberg","full_name":"Padberg, Laura","id":"40300"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"}],"volume":31,"publisher":"Optica Publishing Group","date_updated":"2023-07-05T07:58:31Z","doi":"10.1364/oe.484126","title":"Demonstration of Hong-Ou-Mandel interference in an LNOI directional coupler","type":"journal_article","publication":"Optics Express","status":"public","abstract":[{"text":"Interference between single photons is key for many quantum optics experiments and applications in quantum technologies, such as quantum communication or computation. It is advantageous to operate the systems at telecommunication wavelengths and to integrate the setups for these applications in order to improve stability, compactness and scalability. A new promising material platform for integrated quantum optics is lithium niobate on insulator (LNOI). Here, we realise Hong-Ou-Mandel (HOM) interference between telecom photons from an engineered parametric down-conversion source in an LNOI directional coupler. The coupler has been designed and fabricated in house and provides close to perfect balanced beam splitting. We obtain a raw HOM visibility of (93.5 ± 0.7) %, limited mainly by the source performance and in good agreement with off-chip measurements. This lays the foundation for more sophisticated quantum experiments in LNOI.","lang":"eng"}],"user_id":"63231","department":[{"_id":"15"},{"_id":"230"},{"_id":"623"},{"_id":"288"}],"_id":"45850","language":[{"iso":"eng"}],"article_number":"23140","keyword":["Atomic and Molecular Physics","and Optics"]},{"abstract":[{"text":"A reliable, but cost-effective generation of single-photon states is key for practical quantum communication systems. For real-world deployment, waveguide sources offer optimum compatibility with fiber networks and can be embedded in hybrid integrated modules. Here, we present what we believe to be the first chip-size fully integrated fiber-coupled heralded single photon source (HSPS) module based on a hybrid integration of a nonlinear lithium niobate waveguide into a polymer board. Photon pairs at 810 nm (signal) and 1550 nm (idler) are generated via parametric down-conversion pumped at 532 nm in the LiNbO3 waveguide. The pairs are split in the polymer board and routed to separate output ports. The module has a size of (2 × 1) cm^2 and is fully fiber-coupled with one pump input fiber and two output fibers. We measure a heralded second-order correlation function of g_h(2)=0.05 with a heralding efficiency of η_h=3.5% at low pump powers","lang":"eng"}],"status":"public","type":"journal_article","publication":"Optics Express","article_type":"original","article_number":"22685","keyword":["Atomic and Molecular Physics","and Optics"],"language":[{"iso":"eng"}],"_id":"46644","user_id":"44252","year":"2023","citation":{"short":"C. Kießler, H. Conradi, M. Kleinert, V. Quiring, H. Herrmann, C. Silberhorn, Optics Express 31 (2023).","mla":"Kießler, Christian, et al. “Fiber-Coupled Plug-and-Play Heralded Single Photon Source Based on Ti:LiNbO3 and Polymer Technology.” Optics Express, vol. 31, no. 14, 22685, Optica Publishing Group, 2023, doi:10.1364/oe.487581.","bibtex":"@article{Kießler_Conradi_Kleinert_Quiring_Herrmann_Silberhorn_2023, title={Fiber-coupled plug-and-play heralded single photon source based on Ti:LiNbO3 and polymer technology}, volume={31}, DOI={10.1364/oe.487581}, number={1422685}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Kießler, Christian and Conradi, Hauke and Kleinert, Moritz and Quiring, Viktor and Herrmann, Harald and Silberhorn, Christine}, year={2023} }","apa":"Kießler, C., Conradi, H., Kleinert, M., Quiring, V., Herrmann, H., & Silberhorn, C. (2023). Fiber-coupled plug-and-play heralded single photon source based on Ti:LiNbO3 and polymer technology. Optics Express, 31(14), Article 22685. https://doi.org/10.1364/oe.487581","ama":"Kießler C, Conradi H, Kleinert M, Quiring V, Herrmann H, Silberhorn C. Fiber-coupled plug-and-play heralded single photon source based on Ti:LiNbO3 and polymer technology. Optics Express. 2023;31(14). doi:10.1364/oe.487581","ieee":"C. Kießler, H. Conradi, M. Kleinert, V. Quiring, H. Herrmann, and C. Silberhorn, “Fiber-coupled plug-and-play heralded single photon source based on Ti:LiNbO3 and polymer technology,” Optics Express, vol. 31, no. 14, Art. no. 22685, 2023, doi: 10.1364/oe.487581.","chicago":"Kießler, Christian, Hauke Conradi, Moritz Kleinert, Viktor Quiring, Harald Herrmann, and Christine Silberhorn. “Fiber-Coupled Plug-and-Play Heralded Single Photon Source Based on Ti:LiNbO3 and Polymer Technology.” Optics Express 31, no. 14 (2023). https://doi.org/10.1364/oe.487581."},"intvolume":" 31","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"issue":"14","title":"Fiber-coupled plug-and-play heralded single photon source based on Ti:LiNbO3 and polymer technology","doi":"10.1364/oe.487581","date_updated":"2023-08-23T07:25:37Z","publisher":"Optica Publishing Group","author":[{"last_name":"Kießler","full_name":"Kießler, Christian","id":"44252","first_name":"Christian"},{"full_name":"Conradi, Hauke","last_name":"Conradi","first_name":"Hauke"},{"first_name":"Moritz","full_name":"Kleinert, Moritz","last_name":"Kleinert"},{"full_name":"Quiring, Viktor","last_name":"Quiring","first_name":"Viktor"},{"full_name":"Herrmann, Harald","id":"216","last_name":"Herrmann","first_name":"Harald"},{"last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263","first_name":"Christine"}],"date_created":"2023-08-23T07:20:06Z","volume":31},{"date_updated":"2025-12-11T13:05:14Z","publisher":"Optica Publishing Group","volume":31,"author":[{"first_name":"Thomas","orcid":"0000-0001-8627-2119","last_name":"Hummel","id":"83846","full_name":"Hummel, Thomas"},{"first_name":"Alex","last_name":"Widhalm","full_name":"Widhalm, Alex"},{"first_name":"Jan Philipp","full_name":"Höpker, Jan Philipp","id":"33913","last_name":"Höpker"},{"first_name":"Klaus","last_name":"Jöns","full_name":"Jöns, Klaus","id":"85353"},{"first_name":"Jin","full_name":"Chang, Jin","last_name":"Chang"},{"first_name":"Andreas","full_name":"Fognini, Andreas","last_name":"Fognini"},{"first_name":"Stephan","last_name":"Steinhauer","full_name":"Steinhauer, Stephan"},{"first_name":"Val","full_name":"Zwiller, Val","last_name":"Zwiller"},{"first_name":"Artur","orcid":"0000-0002-5190-0944","last_name":"Zrenner","id":"606","full_name":"Zrenner, Artur"},{"first_name":"Tim","last_name":"Bartley","full_name":"Bartley, Tim","id":"49683"}],"date_created":"2023-01-12T14:46:40Z","title":"Nanosecond gating of superconducting nanowire single-photon detectors using cryogenic bias circuitry","doi":"10.1364/oe.472058","publication_identifier":{"issn":["1094-4087"]},"publication_status":"published","issue":"1","year":"2023","intvolume":" 31","citation":{"ama":"Hummel T, Widhalm A, Höpker JP, et al. Nanosecond gating of superconducting nanowire single-photon detectors using cryogenic bias circuitry. Optics Express. 2023;31(1). doi:10.1364/oe.472058","chicago":"Hummel, Thomas, Alex Widhalm, Jan Philipp Höpker, Klaus Jöns, Jin Chang, Andreas Fognini, Stephan Steinhauer, Val Zwiller, Artur Zrenner, and Tim Bartley. “Nanosecond Gating of Superconducting Nanowire Single-Photon Detectors Using Cryogenic Bias Circuitry.” Optics Express 31, no. 1 (2023). https://doi.org/10.1364/oe.472058.","ieee":"T. Hummel et al., “Nanosecond gating of superconducting nanowire single-photon detectors using cryogenic bias circuitry,” Optics Express, vol. 31, no. 1, Art. no. 610, 2023, doi: 10.1364/oe.472058.","apa":"Hummel, T., Widhalm, A., Höpker, J. P., Jöns, K., Chang, J., Fognini, A., Steinhauer, S., Zwiller, V., Zrenner, A., & Bartley, T. (2023). Nanosecond gating of superconducting nanowire single-photon detectors using cryogenic bias circuitry. Optics Express, 31(1), Article 610. https://doi.org/10.1364/oe.472058","bibtex":"@article{Hummel_Widhalm_Höpker_Jöns_Chang_Fognini_Steinhauer_Zwiller_Zrenner_Bartley_2023, title={Nanosecond gating of superconducting nanowire single-photon detectors using cryogenic bias circuitry}, volume={31}, DOI={10.1364/oe.472058}, number={1610}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Hummel, Thomas and Widhalm, Alex and Höpker, Jan Philipp and Jöns, Klaus and Chang, Jin and Fognini, Andreas and Steinhauer, Stephan and Zwiller, Val and Zrenner, Artur and Bartley, Tim}, year={2023} }","mla":"Hummel, Thomas, et al. “Nanosecond Gating of Superconducting Nanowire Single-Photon Detectors Using Cryogenic Bias Circuitry.” Optics Express, vol. 31, no. 1, 610, Optica Publishing Group, 2023, doi:10.1364/oe.472058.","short":"T. Hummel, A. Widhalm, J.P. Höpker, K. Jöns, J. Chang, A. Fognini, S. Steinhauer, V. Zwiller, A. Zrenner, T. Bartley, Optics Express 31 (2023)."},"_id":"36471","department":[{"_id":"15"},{"_id":"623"},{"_id":"230"},{"_id":"429"},{"_id":"642"}],"user_id":"48188","keyword":["Atomic and Molecular Physics","and Optics"],"article_number":"610","language":[{"iso":"eng"}],"publication":"Optics Express","type":"journal_article","abstract":[{"text":"Superconducting nanowire single-photon detectors (SNSPDs) show near unity efficiency, low dark count rate, and short recovery time. Combining these characteristics with temporal control of SNSPDs broadens their applications as in active de-latching for higher dynamic range counting or temporal filtering for pump-probe spectroscopy or LiDAR. To that end, we demonstrate active gating of an SNSPD with a minimum off-to-on rise time of 2.4 ns and a total gate length of 5.0 ns. We show how the rise time depends on the inductance of the detector in combination with the control electronics. The gate window is demonstrated to be fully and freely, electrically tunable up to 500 ns at a repetition rate of 1.0 MHz, as well as ungated, free-running operation. Control electronics to generate the gating are mounted on the 2.3 K stage of a closed-cycle sorption cryostat, while the detector is operated on the cold stage at 0.8 K. We show that the efficiency and timing jitter of the detector is not altered during the on-time of the gating window. We exploit gated operation to demonstrate a method to increase in the photon counting dynamic range by a factor 11.2, as well as temporal filtering of a strong pump in an emulated pump-probe experiment.","lang":"eng"}],"status":"public"},{"publication":"Optics Express","type":"journal_article","status":"public","department":[{"_id":"15"}],"user_id":"20798","_id":"29716","project":[{"name":"TRR 142: TRR 142","_id":"53"},{"_id":"56","name":"TRR 142 - C: TRR 142 - Project Area C"},{"name":"TRR 142 - C5: TRR 142 - Subproject C5","_id":"75"}],"language":[{"iso":"eng"}],"keyword":["Atomic and Molecular Physics","and Optics"],"article_number":"4867","issue":"4","publication_identifier":{"issn":["1094-4087"]},"publication_status":"published","intvolume":" 30","citation":{"ama":"Widhalm A, Golla C, Weber N, Mackwitz P, Zrenner A, Meier C. Electric-field-induced second harmonic generation in silicon dioxide. Optics Express. 2022;30(4). doi:10.1364/oe.443489","ieee":"A. Widhalm, C. Golla, N. Weber, P. Mackwitz, A. Zrenner, and C. Meier, “Electric-field-induced second harmonic generation in silicon dioxide,” Optics Express, vol. 30, no. 4, Art. no. 4867, 2022, doi: 10.1364/oe.443489.","chicago":"Widhalm, Alex, Christian Golla, Nils Weber, Peter Mackwitz, Artur Zrenner, and Cedrik Meier. “Electric-Field-Induced Second Harmonic Generation in Silicon Dioxide.” Optics Express 30, no. 4 (2022). https://doi.org/10.1364/oe.443489.","apa":"Widhalm, A., Golla, C., Weber, N., Mackwitz, P., Zrenner, A., & Meier, C. (2022). Electric-field-induced second harmonic generation in silicon dioxide. Optics Express, 30(4), Article 4867. https://doi.org/10.1364/oe.443489","mla":"Widhalm, Alex, et al. “Electric-Field-Induced Second Harmonic Generation in Silicon Dioxide.” Optics Express, vol. 30, no. 4, 4867, The Optical Society, 2022, doi:10.1364/oe.443489.","short":"A. Widhalm, C. Golla, N. Weber, P. Mackwitz, A. Zrenner, C. Meier, Optics Express 30 (2022).","bibtex":"@article{Widhalm_Golla_Weber_Mackwitz_Zrenner_Meier_2022, title={Electric-field-induced second harmonic generation in silicon dioxide}, volume={30}, DOI={10.1364/oe.443489}, number={44867}, journal={Optics Express}, publisher={The Optical Society}, author={Widhalm, Alex and Golla, Christian and Weber, Nils and Mackwitz, Peter and Zrenner, Artur and Meier, Cedrik}, year={2022} }"},"year":"2022","volume":30,"author":[{"first_name":"Alex","full_name":"Widhalm, Alex","last_name":"Widhalm"},{"first_name":"Christian","last_name":"Golla","full_name":"Golla, Christian"},{"full_name":"Weber, Nils","last_name":"Weber","first_name":"Nils"},{"first_name":"Peter","last_name":"Mackwitz","full_name":"Mackwitz, Peter"},{"orcid":"0000-0002-5190-0944","last_name":"Zrenner","full_name":"Zrenner, Artur","id":"606","first_name":"Artur"},{"first_name":"Cedrik","last_name":"Meier","orcid":"https://orcid.org/0000-0002-3787-3572","full_name":"Meier, Cedrik","id":"20798"}],"date_created":"2022-02-01T15:36:34Z","date_updated":"2022-02-07T14:20:13Z","publisher":"The Optical Society","doi":"10.1364/oe.443489","title":"Electric-field-induced second harmonic generation in silicon dioxide"},{"title":"Brillouin and Raman imaging of domain walls in periodically-poled 5%-MgO:LiNbO3","publisher":"Optica Publishing Group","date_created":"2023-10-11T08:46:35Z","year":"2022","quality_controlled":"1","issue":"4","keyword":["Atomic and Molecular Physics","and Optics"],"language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Recently, ferroelectric domain walls (DWs) have attracted considerable attention due to their intrinsic topological effects and their huge potential for optoelectronic applications. In contrast, many of the underlying physical properties and phenomena are not well characterized. In this regard, analyzing the vibrational properties, e.g. by Raman spectroscopy, provides direct access to the various local material properties, such as strains, defects or electric fields. While the optical phonon spectra of DWs have been widely investigated in the past, no reports on the acoustic phonon properties of DWs exist. In this work, we present a joint Raman and Brillouin visualization of ferroelectric DWs in the model ferroelectric lithium niobate. This is possible by using a combined Raman and virtually imaged phased array Brillouin setup. Here, we show that DWs can be visualized via frequency shifts observed in the acoustic phonons, as well. The observed contrast then is qualitatively explained by models adapted from Raman spectroscopy. This work, hence, provides a novel route to study ferroelectric DWs and their intrinsic mechanical properties."}],"publication":"Optics Express","doi":"10.1364/oe.447554","date_updated":"2023-10-11T08:46:57Z","volume":30,"author":[{"first_name":"Jan","last_name":"Rix","full_name":"Rix, Jan"},{"id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael"},{"last_name":"Galli","full_name":"Galli, Roberta","first_name":"Roberta"},{"first_name":"Jonas","last_name":"Golde","full_name":"Golde, Jonas"},{"first_name":"Sven","full_name":"Reitzig, Sven","last_name":"Reitzig"},{"full_name":"Eng, Lukas M.","last_name":"Eng","first_name":"Lukas M."},{"first_name":"Edmund","last_name":"Koch","full_name":"Koch, Edmund"}],"intvolume":" 30","citation":{"ama":"Rix J, Rüsing M, Galli R, et al. Brillouin and Raman imaging of domain walls in periodically-poled 5%-MgO:LiNbO3. Optics Express. 2022;30(4). doi:10.1364/oe.447554","ieee":"J. Rix et al., “Brillouin and Raman imaging of domain walls in periodically-poled 5%-MgO:LiNbO3,” Optics Express, vol. 30, no. 4, Art. no. 5051, 2022, doi: 10.1364/oe.447554.","chicago":"Rix, Jan, Michael Rüsing, Roberta Galli, Jonas Golde, Sven Reitzig, Lukas M. Eng, and Edmund Koch. “Brillouin and Raman Imaging of Domain Walls in Periodically-Poled 5%-MgO:LiNbO3.” Optics Express 30, no. 4 (2022). https://doi.org/10.1364/oe.447554.","apa":"Rix, J., Rüsing, M., Galli, R., Golde, J., Reitzig, S., Eng, L. M., & Koch, E. (2022). Brillouin and Raman imaging of domain walls in periodically-poled 5%-MgO:LiNbO3. Optics Express, 30(4), Article 5051. https://doi.org/10.1364/oe.447554","short":"J. Rix, M. Rüsing, R. Galli, J. Golde, S. Reitzig, L.M. Eng, E. Koch, Optics Express 30 (2022).","mla":"Rix, Jan, et al. “Brillouin and Raman Imaging of Domain Walls in Periodically-Poled 5%-MgO:LiNbO3.” Optics Express, vol. 30, no. 4, 5051, Optica Publishing Group, 2022, doi:10.1364/oe.447554.","bibtex":"@article{Rix_Rüsing_Galli_Golde_Reitzig_Eng_Koch_2022, title={Brillouin and Raman imaging of domain walls in periodically-poled 5%-MgO:LiNbO3}, volume={30}, DOI={10.1364/oe.447554}, number={45051}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Rix, Jan and Rüsing, Michael and Galli, Roberta and Golde, Jonas and Reitzig, Sven and Eng, Lukas M. and Koch, Edmund}, year={2022} }"},"publication_identifier":{"issn":["1094-4087"]},"publication_status":"published","article_type":"original","article_number":"5051","extern":"1","_id":"47980","user_id":"22501","status":"public","type":"journal_article"}]