[{"status":"public","publisher":"American Physical Society (APS)","_id":"59276","user_id":"22501","volume":111,"citation":{"bibtex":"@article{Pionteck_Roeper_Koppitz_Seddon_Rüsing_Padberg_Eigner_Silberhorn_Sanna_Eng_2025, title={Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films}, volume={111}, DOI={10.1103/physrevb.111.064109}, number={6064109}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Pionteck, Mike N. and Roeper, Matthias and Koppitz, Boris and Seddon, Samuel D. and Rüsing, Michael and Padberg, Laura and Eigner, Christof and Silberhorn, Christine and Sanna, Simone and Eng, Lukas M.}, year={2025} }","ama":"Pionteck MN, Roeper M, Koppitz B, et al. Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films. Physical Review B. 2025;111(6). doi:10.1103/physrevb.111.064109","mla":"Pionteck, Mike N., et al. “Second-Order Nonlinear Piezo-Optic Properties of Single Crystal Lithium Niobate Thin Films.” Physical Review B, vol. 111, no. 6, 064109, American Physical Society (APS), 2025, doi:10.1103/physrevb.111.064109.","short":"M.N. Pionteck, M. Roeper, B. Koppitz, S.D. Seddon, M. Rüsing, L. Padberg, C. Eigner, C. Silberhorn, S. Sanna, L.M. Eng, Physical Review B 111 (2025).","chicago":"Pionteck, Mike N., Matthias Roeper, Boris Koppitz, Samuel D. Seddon, Michael Rüsing, Laura Padberg, Christof Eigner, Christine Silberhorn, Simone Sanna, and Lukas M. Eng. “Second-Order Nonlinear Piezo-Optic Properties of Single Crystal Lithium Niobate Thin Films.” Physical Review B 111, no. 6 (2025). https://doi.org/10.1103/physrevb.111.064109.","ieee":"M. N. Pionteck et al., “Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films,” Physical Review B, vol. 111, no. 6, Art. no. 064109, 2025, doi: 10.1103/physrevb.111.064109.","apa":"Pionteck, M. N., Roeper, M., Koppitz, B., Seddon, S. D., Rüsing, M., Padberg, L., Eigner, C., Silberhorn, C., Sanna, S., & Eng, L. M. (2025). Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films. Physical Review B, 111(6), Article 064109. https://doi.org/10.1103/physrevb.111.064109"},"quality_controlled":"1","year":"2025","title":"Second-order nonlinear piezo-optic properties of single crystal lithium niobate thin films","publication_identifier":{"issn":["2469-9950","2469-9969"]},"author":[{"first_name":"Mike N.","last_name":"Pionteck","full_name":"Pionteck, Mike N."},{"full_name":"Roeper, Matthias","first_name":"Matthias","last_name":"Roeper"},{"full_name":"Koppitz, Boris","last_name":"Koppitz","first_name":"Boris"},{"full_name":"Seddon, Samuel D.","last_name":"Seddon","first_name":"Samuel D."},{"id":"22501","full_name":"Rüsing, Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael"},{"full_name":"Padberg, Laura","first_name":"Laura","last_name":"Padberg","id":"40300"},{"id":"13244","last_name":"Eigner","first_name":"Christof","orcid":"https://orcid.org/0000-0002-5693-3083","full_name":"Eigner, Christof"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"},{"full_name":"Sanna, Simone","first_name":"Simone","last_name":"Sanna"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."}],"publication_status":"published","date_updated":"2025-04-02T16:24:47Z","intvolume":" 111","article_number":"064109","language":[{"iso":"eng"}],"doi":"10.1103/physrevb.111.064109","publication":"Physical Review B","issue":"6","abstract":[{"text":"Stress plays a crucial role in thin films and layered systems, and thus significantly influences the material's electrical, mechanical and (nonlinear) optical responses. Despite lithium niobate's wide applicability as a nonlinear optical material, the impact of mechanical stress on its nonlinear optical properties is not well characterized. In this work, we systematically study both experimentally and theoretically, the nonlinear optical responses of thin film lithium niobate (TFLN) single crystals. Compressive and tensile stress is applied in our experiment using a piezodriven strain cell. We then record the second-harmonic-generated (SHG) response in back-reflection geometry, and compare these results to theoretical modeling using density functional theory (DFT). Both methods consistently reveal that uniaxial stress induces changes of the nonlinear optical susceptibility of certain tensor elements on the order of up to 1 pm/(V GPa). The exact value depends on the tensor element that is addressed in our SHG analysis, on the crystal orientation, and also whether using compressive or tensile stresses. Furthermore, a lowering of the crystal symmetry when applying stress along the x or y crystallographic axes is observed by the appearance of new nonlinear optical tensor elements within the strained crystals.","lang":"eng"}],"date_created":"2025-04-02T16:21:47Z","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}]},{"publication":"Physical Review Materials","issue":"7","department":[{"_id":"15"},{"_id":"623"},{"_id":"295"},{"_id":"790"},{"_id":"288"},{"_id":"230"},{"_id":"429"},{"_id":"35"},{"_id":"170"},{"_id":"169"},{"_id":"27"}],"type":"journal_article","date_created":"2025-07-09T09:13:24Z","file":[{"creator":"adrianab","date_created":"2025-07-09T09:18:45Z","date_updated":"2025-07-10T06:43:34Z","relation":"main_file","access_level":"open_access","file_size":4175120,"file_name":"Mg_dopants_LN_PRM.pdf","content_type":"application/pdf","file_id":"60567"}],"intvolume":" 9","publication_status":"published","date_updated":"2026-03-17T17:50:06Z","publication_identifier":{"issn":["2475-9953"]},"author":[{"id":"58349","orcid":"0000-0002-2134-3075","first_name":"Adriana","last_name":"Bocchini","full_name":"Bocchini, Adriana"},{"id":"22501","full_name":"Rüsing, Michael","first_name":"Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"id":"61375","last_name":"Bollmers","first_name":"Laura","full_name":"Bollmers, Laura"},{"id":"44373","last_name":"Lengeling","first_name":"Sebastian","full_name":"Lengeling, Sebastian"},{"id":"49772","first_name":"Philipp","orcid":"0000-0003-0643-7636","last_name":"Mues","full_name":"Mues, Philipp"},{"last_name":"Padberg","first_name":"Laura","full_name":"Padberg, Laura","id":"40300"},{"id":"171","last_name":"Gerstmann","orcid":"0000-0002-4476-223X","first_name":"Uwe","full_name":"Gerstmann, Uwe"},{"full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn","id":"26263"},{"full_name":"Eigner, Christof","orcid":"https://orcid.org/0000-0002-5693-3083","first_name":"Christof","last_name":"Eigner","id":"13244"},{"id":"468","first_name":"Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","full_name":"Schmidt, Wolf Gero"}],"year":"2025","title":"Mg dopants in lithium niobate: Defect models and impact on domain inversion","doi":"10.1103/5wz1-bjyr","language":[{"iso":"eng"}],"article_number":"074402","main_file_link":[{"url":"https://link.aps.org/doi/10.1103/5wz1-bjyr","open_access":"1"}],"project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"name":"TRR 142 - A: TRR 142 - Project Area A","_id":"54"},{"name":"TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)","_id":"168"},{"name":"TRR 142 - A11: TRR 142 - Subproject A11","_id":"166"}],"citation":{"bibtex":"@article{Bocchini_Rüsing_Bollmers_Lengeling_Mues_Padberg_Gerstmann_Silberhorn_Eigner_Schmidt_2025, title={Mg dopants in lithium niobate: Defect models and impact on domain inversion}, volume={9}, DOI={10.1103/5wz1-bjyr}, number={7074402}, journal={Physical Review Materials}, publisher={American Physical Society (APS)}, author={Bocchini, Adriana and Rüsing, Michael and Bollmers, Laura and Lengeling, Sebastian and Mues, Philipp and Padberg, Laura and Gerstmann, Uwe and Silberhorn, Christine and Eigner, Christof and Schmidt, Wolf Gero}, year={2025} }","chicago":"Bocchini, Adriana, Michael Rüsing, Laura Bollmers, Sebastian Lengeling, Philipp Mues, Laura Padberg, Uwe Gerstmann, Christine Silberhorn, Christof Eigner, and Wolf Gero Schmidt. “Mg Dopants in Lithium Niobate: Defect Models and Impact on Domain Inversion.” Physical Review Materials 9, no. 7 (2025). https://doi.org/10.1103/5wz1-bjyr.","ama":"Bocchini A, Rüsing M, Bollmers L, et al. Mg dopants in lithium niobate: Defect models and impact on domain inversion. Physical Review Materials. 2025;9(7). doi:10.1103/5wz1-bjyr","short":"A. Bocchini, M. Rüsing, L. Bollmers, S. Lengeling, P. Mues, L. Padberg, U. Gerstmann, C. Silberhorn, C. Eigner, W.G. Schmidt, Physical Review Materials 9 (2025).","ieee":"A. Bocchini et al., “Mg dopants in lithium niobate: Defect models and impact on domain inversion,” Physical Review Materials, vol. 9, no. 7, Art. no. 074402, 2025, doi: 10.1103/5wz1-bjyr.","mla":"Bocchini, Adriana, et al. “Mg Dopants in Lithium Niobate: Defect Models and Impact on Domain Inversion.” Physical Review Materials, vol. 9, no. 7, 074402, American Physical Society (APS), 2025, doi:10.1103/5wz1-bjyr.","apa":"Bocchini, A., Rüsing, M., Bollmers, L., Lengeling, S., Mues, P., Padberg, L., Gerstmann, U., Silberhorn, C., Eigner, C., & Schmidt, W. G. (2025). Mg dopants in lithium niobate: Defect models and impact on domain inversion. Physical Review Materials, 9(7), Article 074402. https://doi.org/10.1103/5wz1-bjyr"},"file_date_updated":"2025-07-10T06:43:34Z","oa":"1","has_accepted_license":"1","status":"public","volume":9,"user_id":"22501","ddc":["530"],"_id":"60566","publisher":"American Physical Society (APS)"},{"abstract":[{"lang":"eng","text":"We study a possibility of measuring the time-resolved second-order autocorrelation function of one of two beams generated in type-II parametric down-conversion by means of temporal magnification of this beam, bringing its correlation time from the picosecond to the nanosecond scale, which can be resolved by modern photodetectors. We show that such a measurement enables one to infer directly the degree of global coherence of that beam, which is linked by a simple relation to the number of modes characterizing the entanglement between the two generated beams. We illustrate the proposed method by an example of photon pairs generated in a periodically poled potassium titanyl phosphate (KTP) crystal with a symmetric group velocity matching for various durations of the pump pulse, resulting in different numbers of modes. Our theoretical model also shows that the magnified double-heralded autocorrelation function of one beam exhibits a local maximum around zero delay time, corresponding to photon bunching at a short time scale."}],"issue":"2","publication":"Physical Review A","type":"journal_article","department":[{"_id":"623"},{"_id":"15"},{"_id":"288"}],"date_created":"2026-01-26T14:28:22Z","date_updated":"2026-03-25T07:59:53Z","publication_status":"published","intvolume":" 112","title":"Time-resolved second-order autocorrelation function of parametric down-conversion","year":"2025","author":[{"first_name":"Dmitri B.","last_name":"Horoshko","full_name":"Horoshko, Dmitri B."},{"full_name":"Srivastava, Shivang","last_name":"Srivastava","first_name":"Shivang"},{"full_name":"Sośnicki, Filip Maksymilian","orcid":"0000-0002-2465-4645","last_name":"Sośnicki","first_name":"Filip Maksymilian","id":"106751"},{"full_name":"Mikołajczyk, Michał","first_name":"Michał","last_name":"Mikołajczyk"},{"full_name":"Karpiński, Michał","first_name":"Michał","last_name":"Karpiński"},{"last_name":"Brecht","first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin","id":"27150"},{"first_name":"Mikhail I.","last_name":"Kolobov","full_name":"Kolobov, Mikhail I."}],"publication_identifier":{"issn":["2469-9926","2469-9934"]},"doi":"10.1103/7ckm-tm3r","article_number":"023703","language":[{"iso":"eng"}],"citation":{"short":"D.B. Horoshko, S. Srivastava, F.M. Sośnicki, M. Mikołajczyk, M. Karpiński, B. Brecht, M.I. Kolobov, Physical Review A 112 (2025).","chicago":"Horoshko, Dmitri B., Shivang Srivastava, Filip Maksymilian Sośnicki, Michał Mikołajczyk, Michał Karpiński, Benjamin Brecht, and Mikhail I. Kolobov. “Time-Resolved Second-Order Autocorrelation Function of Parametric down-Conversion.” Physical Review A 112, no. 2 (2025). https://doi.org/10.1103/7ckm-tm3r.","apa":"Horoshko, D. B., Srivastava, S., Sośnicki, F. M., Mikołajczyk, M., Karpiński, M., Brecht, B., & Kolobov, M. I. (2025). Time-resolved second-order autocorrelation function of parametric down-conversion. Physical Review A, 112(2), Article 023703. https://doi.org/10.1103/7ckm-tm3r","ieee":"D. B. Horoshko et al., “Time-resolved second-order autocorrelation function of parametric down-conversion,” Physical Review A, vol. 112, no. 2, Art. no. 023703, 2025, doi: 10.1103/7ckm-tm3r.","ama":"Horoshko DB, Srivastava S, Sośnicki FM, et al. Time-resolved second-order autocorrelation function of parametric down-conversion. Physical Review A. 2025;112(2). doi:10.1103/7ckm-tm3r","bibtex":"@article{Horoshko_Srivastava_Sośnicki_Mikołajczyk_Karpiński_Brecht_Kolobov_2025, title={Time-resolved second-order autocorrelation function of parametric down-conversion}, volume={112}, DOI={10.1103/7ckm-tm3r}, number={2023703}, journal={Physical Review A}, publisher={American Physical Society (APS)}, author={Horoshko, Dmitri B. and Srivastava, Shivang and Sośnicki, Filip Maksymilian and Mikołajczyk, Michał and Karpiński, Michał and Brecht, Benjamin and Kolobov, Mikhail I.}, year={2025} }","mla":"Horoshko, Dmitri B., et al. “Time-Resolved Second-Order Autocorrelation Function of Parametric down-Conversion.” Physical Review A, vol. 112, no. 2, 023703, American Physical Society (APS), 2025, doi:10.1103/7ckm-tm3r."},"status":"public","user_id":"27150","volume":112,"_id":"63733","publisher":"American Physical Society (APS)"},{"year":"2024","title":"Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium ","author":[{"full_name":"Zahn, Manuel","first_name":"Manuel","last_name":"Zahn"},{"last_name":"Beyreuther","first_name":"Elke","full_name":"Beyreuther, Elke"},{"first_name":"Iuliia","last_name":"Kiseleva","full_name":"Kiseleva, Iuliia"},{"last_name":"Lotfy","first_name":"Ahmed Samir","full_name":"Lotfy, Ahmed Samir"},{"last_name":"McCluskey","first_name":"Conor J.","full_name":"McCluskey, Conor J."},{"first_name":"Jesi R.","last_name":"Maguire","full_name":"Maguire, Jesi R."},{"first_name":"Ahmet","last_name":"Suna","full_name":"Suna, Ahmet"},{"id":"22501","orcid":"0000-0003-4682-4577","first_name":"Michael","last_name":"Rüsing","full_name":"Rüsing, Michael"},{"full_name":"Gregg, J. Marty","first_name":"J. Marty","last_name":"Gregg"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."}],"publication_identifier":{"issn":["2331-7019"]},"date_updated":"2024-02-06T08:08:09Z","publication_status":"published","intvolume":" 21","article_type":"original","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2307.10322"}],"article_number":"024007","language":[{"iso":"eng"}],"doi":"10.1103/physrevapplied.21.024007","issue":"2","publication":"Physical Review Applied","abstract":[{"lang":"eng","text":"Ferroelectric domain wall (DW) conductivity (DWC) can be attributed to two separate mechanisms: (a) the injection/ejection of charge carriers across the Schottky barrier formed at the (metal-)electrode-DW junction and (b) the transport of those charge carriers along the DW. Current-voltage (I-U) characteristics, recorded at variable temperatures from LiNbO3 (LNO) DWs, are clearly able to differentiate between these two contributions. Practically, they allow us to directly quantify the physical parameters relevant to the two mechanisms (a) and (b) mentioned above. These are, for example, the resistance of the DW, the saturation current, the ideality factor, and the Schottky barrier height of the electrode-DW junction. Furthermore, the activation energies needed to initiate the thermally activated electronic transport along the DWs can be extracted. In addition, we show that electronic transport along LNO DWs can be elegantly viewed and interpreted in an adapted semiconductor picture based on a double-diode, double-resistor equivalent-circuit model, the R2D2 model. Finally, our R2D2 model was checked for its universality by successfully fitting the I-U curves of not only z-cut LNO bulk DWs, but equally of z-cut thin-film LNO DWs, and of x-cut thin-film DWs as reported in literature."}],"date_created":"2024-02-06T08:02:15Z","type":"journal_article","keyword":["General Physics and Astronomy"],"department":[{"_id":"15"},{"_id":"169"},{"_id":"623"},{"_id":"288"}],"status":"public","publisher":"American Physical Society (APS)","_id":"51156","user_id":"22501","volume":21,"citation":{"apa":"Zahn, M., Beyreuther, E., Kiseleva, I., Lotfy, A. S., McCluskey, C. J., Maguire, J. R., Suna, A., Rüsing, M., Gregg, J. M., & Eng, L. M. (2024). Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium . Physical Review Applied, 21(2), Article 024007. https://doi.org/10.1103/physrevapplied.21.024007","mla":"Zahn, Manuel, et al. “Equivalent-Circuit Model That Quantitatively Describes Domain-Wall Conductivity in Ferroelectric Lithium .” Physical Review Applied, vol. 21, no. 2, 024007, American Physical Society (APS), 2024, doi:10.1103/physrevapplied.21.024007.","ieee":"M. Zahn et al., “Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium ,” Physical Review Applied, vol. 21, no. 2, Art. no. 024007, 2024, doi: 10.1103/physrevapplied.21.024007.","chicago":"Zahn, Manuel, Elke Beyreuther, Iuliia Kiseleva, Ahmed Samir Lotfy, Conor J. McCluskey, Jesi R. Maguire, Ahmet Suna, Michael Rüsing, J. Marty Gregg, and Lukas M. Eng. “Equivalent-Circuit Model That Quantitatively Describes Domain-Wall Conductivity in Ferroelectric Lithium .” Physical Review Applied 21, no. 2 (2024). https://doi.org/10.1103/physrevapplied.21.024007.","short":"M. Zahn, E. Beyreuther, I. Kiseleva, A.S. Lotfy, C.J. McCluskey, J.R. Maguire, A. Suna, M. Rüsing, J.M. Gregg, L.M. Eng, Physical Review Applied 21 (2024).","ama":"Zahn M, Beyreuther E, Kiseleva I, et al. Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium . Physical Review Applied. 2024;21(2). doi:10.1103/physrevapplied.21.024007","bibtex":"@article{Zahn_Beyreuther_Kiseleva_Lotfy_McCluskey_Maguire_Suna_Rüsing_Gregg_Eng_2024, title={Equivalent-circuit model that quantitatively describes domain-wall conductivity in ferroelectric lithium }, volume={21}, DOI={10.1103/physrevapplied.21.024007}, number={2024007}, journal={Physical Review Applied}, publisher={American Physical Society (APS)}, author={Zahn, Manuel and Beyreuther, Elke and Kiseleva, Iuliia and Lotfy, Ahmed Samir and McCluskey, Conor J. and Maguire, Jesi R. and Suna, Ahmet and Rüsing, Michael and Gregg, J. Marty and Eng, Lukas M.}, year={2024} }"},"quality_controlled":"1","oa":"1"},{"date_created":"2024-02-13T13:03:01Z","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"type":"journal_article","keyword":["Atomic and Molecular Physics","and Optics"],"citation":{"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} }","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","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.","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.","short":"J. Babai-Hemati, F. vom Bruch, H. Herrmann, C. Silberhorn, Optics Express (2024).","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"},"publication":"Optics Express","project":[{"_id":"266","grant_number":"PROFILNRW-2020-067","name":"PhoQC: PhoQC: Photonisches Quantencomputing"}],"publisher":"Optica Publishing Group","_id":"51339","language":[{"iso":"eng"}],"doi":"10.1364/oe.510319","user_id":"216","author":[{"full_name":"Babai-Hemati, Jonas","first_name":"Jonas","last_name":"Babai-Hemati"},{"id":"71245","first_name":"Felix","last_name":"vom Bruch","full_name":"vom Bruch, Felix"},{"id":"216","last_name":"Herrmann","first_name":"Harald","full_name":"Herrmann, Harald"},{"last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263"}],"publication_identifier":{"issn":["1094-4087"]},"status":"public","year":"2024","title":"Tailored second harmonic generation inTi-diffused PPLN waveguides usingmicro-heaters","date_updated":"2024-02-13T13:09:51Z","publication_status":"published"},{"volume":5,"user_id":"88149","publisher":"American Physical Society (APS)","_id":"54544","status":"public","project":[{"name":"MiLiQuant: Miniaturisierte Lichtquellen für den industriellen Einsatz in Quantensensoren und Quanten-Imaging-Systemen (MiLiQuant) - Teilvorhaben: Technologie und Theorie für MIR Quanten-Imaging Systeme","_id":"207","grant_number":"13N15065"},{"grant_number":"101070700","_id":"571","name":"MIRAQLS: MIRAQLS: Mid-infrared Quantum Technology for Sensing"},{"_id":"190","name":"E2TPA: Exploiting Entangled Two-Photon Absorption"}],"citation":{"mla":"Roeder, Franz, et al. “Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer.” PRX Quantum, vol. 5, no. 2, 020350, American Physical Society (APS), 2024, doi:10.1103/prxquantum.5.020350.","bibtex":"@article{Roeder_Pollmann_Stefszky_Santandrea_Luo_Quiring_Ricken_Eigner_Brecht_Silberhorn_2024, title={Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer}, volume={5}, DOI={10.1103/prxquantum.5.020350}, number={2020350}, journal={PRX Quantum}, publisher={American Physical Society (APS)}, author={Roeder, Franz and Pollmann, René and Stefszky, Michael and Santandrea, Matteo and Luo, Kai Hong and Quiring, V. and Ricken, Raimund and Eigner, Christof and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }","ama":"Roeder F, Pollmann R, Stefszky M, et al. Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer. PRX Quantum. 2024;5(2). doi:10.1103/prxquantum.5.020350","ieee":"F. Roeder et al., “Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer,” PRX Quantum, vol. 5, no. 2, Art. no. 020350, 2024, doi: 10.1103/prxquantum.5.020350.","apa":"Roeder, F., Pollmann, R., Stefszky, M., Santandrea, M., Luo, K. H., Quiring, V., Ricken, R., Eigner, C., Brecht, B., & Silberhorn, C. (2024). Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer. PRX Quantum, 5(2), Article 020350. https://doi.org/10.1103/prxquantum.5.020350","chicago":"Roeder, Franz, René Pollmann, Michael Stefszky, Matteo Santandrea, Kai Hong Luo, V. Quiring, Raimund Ricken, Christof Eigner, Benjamin Brecht, and Christine Silberhorn. “Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer.” PRX Quantum 5, no. 2 (2024). https://doi.org/10.1103/prxquantum.5.020350.","short":"F. Roeder, R. Pollmann, M. Stefszky, M. Santandrea, K.H. Luo, V. Quiring, R. Ricken, C. Eigner, B. Brecht, C. Silberhorn, PRX Quantum 5 (2024)."},"doi":"10.1103/prxquantum.5.020350","language":[{"iso":"eng"}],"article_number":"020350","intvolume":" 5","date_updated":"2024-06-01T13:00:53Z","publication_status":"published","author":[{"last_name":"Roeder","first_name":"Franz","full_name":"Roeder, Franz","id":"88149"},{"full_name":"Pollmann, René","first_name":"René","last_name":"Pollmann","id":"78890"},{"id":"42777","full_name":"Stefszky, Michael","first_name":"Michael","last_name":"Stefszky"},{"id":"55095","first_name":"Matteo","orcid":"0000-0001-5718-358X","last_name":"Santandrea","full_name":"Santandrea, Matteo"},{"full_name":"Luo, Kai Hong","first_name":"Kai Hong","orcid":"0000-0003-1008-4976","last_name":"Luo","id":"36389"},{"first_name":"V.","last_name":"Quiring","full_name":"Quiring, V."},{"first_name":"Raimund","last_name":"Ricken","full_name":"Ricken, Raimund"},{"id":"13244","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","first_name":"Christof","full_name":"Eigner, Christof"},{"full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin","last_name":"Brecht","id":"27150"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"}],"publication_identifier":{"issn":["2691-3399"]},"year":"2024","title":"Measurement of Ultrashort Biphoton Correlation Times with an Integrated Two-Color Broadband SU(1,1)-Interferometer","department":[{"_id":"288"},{"_id":"623"}],"type":"journal_article","date_created":"2024-06-01T12:48:51Z","abstract":[{"text":"The biphoton correlation time, a measure for the conditional uncertainty in the temporal arrival of two photons from a photon pair source, is a key performance identifier for many quantum spectroscopy applications, with shorter correlation times typically yielding better performance. Furthermore, it provides fundamental insight into the effects of dispersion on the biphoton state. Here, we show that a characteristic dependence of the width of the temporal interferogram can be exploited to obtain insights into the amount of second-order dispersion inside the interferometer and to retrieve actual and Fourier-limited ultrashort biphoton correlation times of around 100 fs. In the presented scheme, we simultaneously measure spectral and temporal interferograms at the output of an SU(1,1) interferometer based on an integrated broadband parametric down conversion source in a Ti:LiNbO3 waveguide.","lang":"eng"}],"publication":"PRX Quantum","issue":"2"},{"citation":{"short":"L.T. Weinbrenner, N. Prasannan, K. Hansenne, S. Denker, J. Sperling, B. Brecht, C. Silberhorn, O. Gühne, Physical Review Letters 132 (2024).","chicago":"Weinbrenner, Lisa T., Nidhin Prasannan, Kiara Hansenne, Sophia Denker, Jan Sperling, Benjamin Brecht, Christine Silberhorn, and Otfried Gühne. “Certifying the Topology of Quantum Networks: Theory and Experiment.” Physical Review Letters 132, no. 24 (2024). https://doi.org/10.1103/physrevlett.132.240802.","ieee":"L. T. Weinbrenner et al., “Certifying the Topology of Quantum Networks: Theory and Experiment,” Physical Review Letters, vol. 132, no. 24, Art. no. 240802, 2024, doi: 10.1103/physrevlett.132.240802.","apa":"Weinbrenner, L. T., Prasannan, N., Hansenne, K., Denker, S., Sperling, J., Brecht, B., Silberhorn, C., & Gühne, O. (2024). Certifying the Topology of Quantum Networks: Theory and Experiment. Physical Review Letters, 132(24), Article 240802. https://doi.org/10.1103/physrevlett.132.240802","bibtex":"@article{Weinbrenner_Prasannan_Hansenne_Denker_Sperling_Brecht_Silberhorn_Gühne_2024, title={Certifying the Topology of Quantum Networks: Theory and Experiment}, volume={132}, DOI={10.1103/physrevlett.132.240802}, number={24240802}, journal={Physical Review Letters}, publisher={American Physical Society (APS)}, author={Weinbrenner, Lisa T. and Prasannan, Nidhin and Hansenne, Kiara and Denker, Sophia and Sperling, Jan and Brecht, Benjamin and Silberhorn, Christine and Gühne, Otfried}, year={2024} }","ama":"Weinbrenner LT, Prasannan N, Hansenne K, et al. Certifying the Topology of Quantum Networks: Theory and Experiment. Physical Review Letters. 2024;132(24). doi:10.1103/physrevlett.132.240802","mla":"Weinbrenner, Lisa T., et al. “Certifying the Topology of Quantum Networks: Theory and Experiment.” Physical Review Letters, vol. 132, no. 24, 240802, American Physical Society (APS), 2024, doi:10.1103/physrevlett.132.240802."},"volume":132,"user_id":"27150","_id":"54812","publisher":"American Physical Society (APS)","status":"public","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"type":"journal_article","date_created":"2024-06-19T06:36:54Z","publication":"Physical Review Letters","issue":"24","doi":"10.1103/physrevlett.132.240802","language":[{"iso":"eng"}],"article_number":"240802","intvolume":" 132","date_updated":"2024-06-19T06:59:45Z","publication_status":"published","author":[{"full_name":"Weinbrenner, Lisa T.","first_name":"Lisa T.","last_name":"Weinbrenner"},{"full_name":"Prasannan, Nidhin","first_name":"Nidhin","last_name":"Prasannan","id":"71403"},{"first_name":"Kiara","last_name":"Hansenne","full_name":"Hansenne, Kiara"},{"full_name":"Denker, Sophia","first_name":"Sophia","last_name":"Denker"},{"full_name":"Sperling, Jan","first_name":"Jan","last_name":"Sperling","orcid":"0000-0002-5844-3205","id":"75127"},{"id":"27150","first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","full_name":"Brecht, Benjamin"},{"id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn"},{"full_name":"Gühne, Otfried","first_name":"Otfried","last_name":"Gühne"}],"publication_identifier":{"issn":["0031-9007","1079-7114"]},"year":"2024","title":"Certifying the Topology of Quantum Networks: Theory and Experiment"},{"citation":{"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","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.","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.","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","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."},"file_date_updated":"2024-06-10T11:25:00Z","project":[{"_id":"53","grant_number":"231447078","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*)","_id":"175","grant_number":"231447078"},{"_id":"167","grant_number":"231447078","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)"},{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","grant_number":"PROFILNRW-2020-067","_id":"266"}],"oa":"1","status":"public","has_accepted_license":"1","publisher":"Optica Publishing Group","_id":"54668","page":"22878","volume":32,"ddc":["530"],"user_id":"158","issue":"13","publication":"Optics Express","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."}],"date_created":"2024-06-10T11:18:06Z","file":[{"creator":"fossie","date_created":"2024-06-10T11:25:00Z","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"}],"department":[{"_id":"61"},{"_id":"429"},{"_id":"623"},{"_id":"263"},{"_id":"288"}],"keyword":["tet_topic_waveguide"],"type":"journal_article","author":[{"full_name":"Hammer, Manfred","first_name":"Manfred","last_name":"Hammer","orcid":"0000-0002-6331-9348","id":"48077"},{"orcid":"https://orcid.org/0000-0002-1568-2580","first_name":"Silia","last_name":"Babel","full_name":"Babel, Silia","id":"63231"},{"id":"53444","orcid":"0000-0001-7730-3489","last_name":"Farheen","first_name":"Henna","full_name":"Farheen, Henna"},{"full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura","id":"40300"},{"last_name":"Scheytt","orcid":"0000-0002-5950-6618 ","first_name":"J. Christoph","full_name":"Scheytt, J. Christoph","id":"37144"},{"id":"26263","last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine"},{"full_name":"Förstner, Jens","first_name":"Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","id":"158"}],"publication_identifier":{"issn":["1094-4087"]},"title":"Estimation of losses caused by sidewall roughness in thin-film lithium niobate rib and strip waveguides","year":"2024","intvolume":" 32","date_updated":"2024-07-22T07:43:02Z","publication_status":"published","language":[{"iso":"eng"}],"doi":"10.1364/oe.521766"},{"type":"journal_article","keyword":["Atomic and Molecular Physics","and Optics","Engineering (miscellaneous)","Electrical and Electronic Engineering"],"department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"date_created":"2023-12-15T07:32:38Z","abstract":[{"text":"Broadband coherent anti-Stokes Raman scattering (BCARS) is a powerful spectroscopy method combining high signal intensity with spectral sensitivity, enabling rapid imaging of heterogeneous samples in biomedical research and, more recently, in crystalline materials. However, BCARS encounters spectral distortion due to a setup-dependent non-resonant background (NRB). This study assesses BCARS reproducibility through a round robin experiment using two distinct BCARS setups and crystalline materials with varying structural complexity, including diamond, 6H-SiC, KDP, and KTP. The analysis compares setup-specific NRB correction procedures, detected and NRB-removed spectra, and mode assignment. We determine the influence of BCARS setup parameters like pump wavelength, pulse width, and detection geometry and provide a practical guide for optimizing BCARS setups for solid-state applications.","lang":"eng"}],"related_material":{"link":[{"relation":"confirmation","url":"https://arxiv.org/abs/2306.09701"}]},"publication":"Applied Optics","issue":"1","doi":"10.1364/ao.505374","article_number":"112","main_file_link":[{"open_access":"1","url":"https://arxiv.org/pdf/2306.09701.pdf"}],"language":[{"iso":"eng"}],"publication_status":"published","date_updated":"2025-04-03T12:36:01Z","article_type":"original","intvolume":" 63","title":"Comparing transmission- and epi-BCARS: a round robin on solid-state materials","year":"2024","author":[{"full_name":"Hempel, Franz","first_name":"Franz","last_name":"Hempel"},{"full_name":"Vernuccio, Federico","first_name":"Federico","last_name":"Vernuccio"},{"first_name":"Lukas","last_name":"König","full_name":"König, Lukas"},{"full_name":"Buschbeck, Robin","first_name":"Robin","last_name":"Buschbeck"},{"full_name":"Rüsing, Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael","id":"22501"},{"last_name":"Cerullo","first_name":"Giulio","full_name":"Cerullo, Giulio"},{"first_name":"Dario","last_name":"Polli","full_name":"Polli, Dario"},{"last_name":"Eng","first_name":"Lukas M.","full_name":"Eng, Lukas M."}],"publication_identifier":{"issn":["1559-128X","2155-3165"]},"oa":"1","quality_controlled":"1","citation":{"short":"F. Hempel, F. Vernuccio, L. König, R. Buschbeck, M. Rüsing, G. Cerullo, D. Polli, L.M. Eng, Applied Optics 63 (2024).","chicago":"Hempel, Franz, Federico Vernuccio, Lukas König, Robin Buschbeck, Michael Rüsing, Giulio Cerullo, Dario Polli, and Lukas M. Eng. “Comparing Transmission- and Epi-BCARS: A Round Robin on Solid-State Materials.” Applied Optics 63, no. 1 (2024). https://doi.org/10.1364/ao.505374.","ieee":"F. Hempel et al., “Comparing transmission- and epi-BCARS: a round robin on solid-state materials,” Applied Optics, vol. 63, no. 1, Art. no. 112, 2024, doi: 10.1364/ao.505374.","apa":"Hempel, F., Vernuccio, F., König, L., Buschbeck, R., Rüsing, M., Cerullo, G., Polli, D., & Eng, L. M. (2024). Comparing transmission- and epi-BCARS: a round robin on solid-state materials. Applied Optics, 63(1), Article 112. https://doi.org/10.1364/ao.505374","bibtex":"@article{Hempel_Vernuccio_König_Buschbeck_Rüsing_Cerullo_Polli_Eng_2024, title={Comparing transmission- and epi-BCARS: a round robin on solid-state materials}, volume={63}, DOI={10.1364/ao.505374}, number={1112}, journal={Applied Optics}, publisher={Optica Publishing Group}, author={Hempel, Franz and Vernuccio, Federico and König, Lukas and Buschbeck, Robin and Rüsing, Michael and Cerullo, Giulio and Polli, Dario and Eng, Lukas M.}, year={2024} }","ama":"Hempel F, Vernuccio F, König L, et al. Comparing transmission- and epi-BCARS: a round robin on solid-state materials. Applied Optics. 2024;63(1). doi:10.1364/ao.505374","mla":"Hempel, Franz, et al. “Comparing Transmission- and Epi-BCARS: A Round Robin on Solid-State Materials.” Applied Optics, vol. 63, no. 1, 112, Optica Publishing Group, 2024, doi:10.1364/ao.505374."},"user_id":"22501","volume":63,"_id":"49652","publisher":"Optica Publishing Group","status":"public"},{"citation":{"ieee":"L. Serino, W. Ridder, A. Bhattacharjee, J. Gil López, B. Brecht, and C. Silberhorn, “Orchestrating time and color: a programmable source of high-dimensional entanglement,” Optica Quantum, 2024, doi: 10.1364/opticaq.532334.","apa":"Serino, L., Ridder, W., Bhattacharjee, A., Gil López, J., Brecht, B., & Silberhorn, C. (2024). Orchestrating time and color: a programmable source of high-dimensional entanglement. Optica Quantum. https://doi.org/10.1364/opticaq.532334","chicago":"Serino, Laura, Werner Ridder, Abhinandan Bhattacharjee, Jano Gil López, Benjamin Brecht, and Christine Silberhorn. “Orchestrating Time and Color: A Programmable Source of High-Dimensional Entanglement.” Optica Quantum, 2024. https://doi.org/10.1364/opticaq.532334.","short":"L. Serino, W. Ridder, A. Bhattacharjee, J. Gil López, B. Brecht, C. Silberhorn, Optica Quantum (2024).","mla":"Serino, Laura, et al. “Orchestrating Time and Color: A Programmable Source of High-Dimensional Entanglement.” Optica Quantum, Optica Publishing Group, 2024, doi:10.1364/opticaq.532334.","bibtex":"@article{Serino_Ridder_Bhattacharjee_Gil López_Brecht_Silberhorn_2024, title={Orchestrating time and color: a programmable source of high-dimensional entanglement}, DOI={10.1364/opticaq.532334}, journal={Optica Quantum}, publisher={Optica Publishing Group}, author={Serino, Laura and Ridder, Werner and Bhattacharjee, Abhinandan and Gil López, Jano and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }","ama":"Serino L, Ridder W, Bhattacharjee A, Gil López J, Brecht B, Silberhorn C. Orchestrating time and color: a programmable source of high-dimensional entanglement. Optica Quantum. Published online 2024. doi:10.1364/opticaq.532334"},"publication":"Optica Quantum","project":[{"_id":"211","name":"QuICHE: Quanteninformation und Quantenkommunikation mit hochdimensionaler Informationskodierung (QuICHE)"}],"date_created":"2024-09-27T11:46:59Z","department":[{"_id":"288"},{"_id":"623"},{"_id":"288"}],"type":"journal_article","publication_identifier":{"issn":["2837-6714"]},"author":[{"id":"88242","full_name":"Serino, Laura","first_name":"Laura","last_name":"Serino"},{"first_name":"Werner","last_name":"Ridder","full_name":"Ridder, Werner","id":"63574"},{"last_name":"Bhattacharjee","first_name":"Abhinandan","full_name":"Bhattacharjee, Abhinandan","id":"95902"},{"full_name":"Gil López, Jano","last_name":"Gil López","first_name":"Jano","id":"51223"},{"id":"27150","orcid":"0000-0003-4140-0556 ","last_name":"Brecht","first_name":"Benjamin","full_name":"Brecht, Benjamin"},{"id":"26263","full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine"}],"status":"public","title":"Orchestrating time and color: a programmable source of high-dimensional entanglement","year":"2024","date_updated":"2025-12-01T08:49:46Z","publication_status":"published","publisher":"Optica Publishing Group","_id":"56267","language":[{"iso":"eng"}],"doi":"10.1364/opticaq.532334","user_id":"63574"},{"citation":{"short":"S. De, V. Ansari, J. Sperling, S. Barkhofen, B. Brecht, C. Silberhorn, Physical Review Research 6 (2024).","chicago":"De, Syamsundar, Vahid Ansari, Jan Sperling, Sonja Barkhofen, Benjamin Brecht, and Christine Silberhorn. “Realization of High-Fidelity Unitary Operations on up to 64 Frequency Bins.” Physical Review Research 6, no. 2 (2024). https://doi.org/10.1103/physrevresearch.6.l022040.","ieee":"S. De, V. Ansari, J. Sperling, S. Barkhofen, B. Brecht, and C. Silberhorn, “Realization of high-fidelity unitary operations on up to 64 frequency bins,” Physical Review Research, vol. 6, no. 2, Art. no. L022040, 2024, doi: 10.1103/physrevresearch.6.l022040.","apa":"De, S., Ansari, V., Sperling, J., Barkhofen, S., Brecht, B., & Silberhorn, C. (2024). Realization of high-fidelity unitary operations on up to 64 frequency bins. Physical Review Research, 6(2), Article L022040. https://doi.org/10.1103/physrevresearch.6.l022040","bibtex":"@article{De_Ansari_Sperling_Barkhofen_Brecht_Silberhorn_2024, title={Realization of high-fidelity unitary operations on up to 64 frequency bins}, volume={6}, DOI={10.1103/physrevresearch.6.l022040}, number={2L022040}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={De, Syamsundar and Ansari, Vahid and Sperling, Jan and Barkhofen, Sonja and Brecht, Benjamin and Silberhorn, Christine}, year={2024} }","ama":"De S, Ansari V, Sperling J, Barkhofen S, Brecht B, Silberhorn C. Realization of high-fidelity unitary operations on up to 64 frequency bins. Physical Review Research. 2024;6(2). doi:10.1103/physrevresearch.6.l022040","mla":"De, Syamsundar, et al. “Realization of High-Fidelity Unitary Operations on up to 64 Frequency Bins.” Physical Review Research, vol. 6, no. 2, L022040, American Physical Society (APS), 2024, doi:10.1103/physrevresearch.6.l022040."},"project":[{"name":"QuPoPCoRN: QUPOPCORN: Quantum Particles on Programmable Complex Reconfigurable Networks","_id":"216"}],"_id":"54288","publisher":"American Physical Society (APS)","user_id":"27150","volume":6,"status":"public","date_created":"2024-05-14T12:40:48Z","type":"journal_article","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"publication":"Physical Review Research","issue":"2","abstract":[{"lang":"eng","text":"The ability to apply user-chosen large-scale unitary operations with high fidelity to a quantum state is key to realizing future photonic quantum technologies. Here, we realize the implementation of programmable unitary operations on up to 64 frequency-bin modes. To benchmark the performance of our system, we probe different quantum walk unitary operations, in particular, Grover walks on four-dimensional hypercubes with similarities exceeding 95% and quantum walks with 400 steps on circles and finite lines with similarities of 98%. Our results open a path toward implementing high-quality unitary operations, which can form the basis for applications in complex tasks, such as Gaussian boson sampling.\r\n \r\n \r\n \r\n \r\n Published by the American Physical Society\r\n 2024\r\n \r\n \r\n "}],"article_number":"L022040","language":[{"iso":"eng"}],"doi":"10.1103/physrevresearch.6.l022040","year":"2024","title":"Realization of high-fidelity unitary operations on up to 64 frequency bins","publication_identifier":{"issn":["2643-1564"]},"author":[{"full_name":"De, Syamsundar","last_name":"De","first_name":"Syamsundar"},{"full_name":"Ansari, Vahid","first_name":"Vahid","last_name":"Ansari"},{"last_name":"Sperling","first_name":"Jan","orcid":"0000-0002-5844-3205","full_name":"Sperling, Jan","id":"75127"},{"full_name":"Barkhofen, Sonja","first_name":"Sonja","last_name":"Barkhofen","id":"48188"},{"first_name":"Benjamin","last_name":"Brecht","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin","id":"27150"},{"id":"26263","last_name":"Silberhorn","first_name":"Christine","full_name":"Silberhorn, Christine"}],"date_updated":"2025-12-18T16:14:39Z","publication_status":"published","intvolume":" 6"},{"status":"public","_id":"54815","publisher":"Optica Publishing Group","user_id":"78890","volume":32,"citation":{"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.","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} }","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","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.","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","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.","short":"R. Pollmann, F. Roeder, V. Quiring, R. Ricken, C. Eigner, B. Brecht, C. Silberhorn, Optics Express 32 (2024)."},"title":"Integrated, bright broadband, two-colour parametric down-conversion source","year":"2024","publication_identifier":{"issn":["1094-4087"]},"author":[{"id":"78890","full_name":"Pollmann, René","first_name":"René","last_name":"Pollmann"},{"id":"88149","full_name":"Roeder, Franz","last_name":"Roeder","first_name":"Franz"},{"first_name":"Victor","last_name":"Quiring","full_name":"Quiring, Victor"},{"last_name":"Ricken","first_name":"Raimund","full_name":"Ricken, Raimund"},{"first_name":"Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083","full_name":"Eigner, Christof","id":"13244"},{"id":"27150","last_name":"Brecht","first_name":"Benjamin","orcid":"0000-0003-4140-0556 ","full_name":"Brecht, Benjamin"},{"full_name":"Silberhorn, Christine","last_name":"Silberhorn","first_name":"Christine","id":"26263"}],"publication_status":"published","date_updated":"2025-12-19T11:37:41Z","article_type":"original","intvolume":" 32","article_number":"23945","language":[{"iso":"eng"}],"doi":"10.1364/oe.522549","issue":"14","publication":"Optics Express","abstract":[{"lang":"eng","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."}],"date_created":"2024-06-19T06:58:17Z","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}]},{"doi":"10.1088/1367-2630/ad9f98","language":[{"iso":"eng"}],"article_number":"123025","article_type":"original","intvolume":" 26","publication_status":"published","date_updated":"2025-12-19T11:36:36Z","author":[{"full_name":"Roeder, Franz","last_name":"Roeder","first_name":"Franz","id":"88149"},{"first_name":"Abira","last_name":"Gnanavel","full_name":"Gnanavel, Abira"},{"full_name":"Pollmann, René","first_name":"René","last_name":"Pollmann","id":"78890"},{"last_name":"Brecht","first_name":"Olga","full_name":"Brecht, Olga"},{"id":"42777","full_name":"Stefszky, Michael","first_name":"Michael","last_name":"Stefszky"},{"full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura","id":"40300"},{"id":"13244","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","first_name":"Christof","full_name":"Eigner, Christof"},{"id":"26263","full_name":"Silberhorn, Christine","first_name":"Christine","last_name":"Silberhorn"},{"id":"27150","full_name":"Brecht, Benjamin","orcid":"0000-0003-4140-0556 ","first_name":"Benjamin","last_name":"Brecht"}],"publication_identifier":{"issn":["1367-2630"]},"title":"Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared","year":"2024","department":[{"_id":"288"},{"_id":"623"},{"_id":"15"}],"type":"journal_article","date_created":"2024-12-27T19:01:14Z","abstract":[{"lang":"eng","text":"The latest applications in ultrafast quantum metrology require bright, broadband bi-photon sources with one of the photons in the mid-infrared and the other in the visible to near infrared. However, existing sources based on bulk crystals are limited in brightness due to the short interaction length and only allow for limited dispersion engineering. Here, we present an integrated PDC source based on a Ti:LiNbO3 waveguide that generates broadband bi-photons with central wavelengths at 860 nm and 2800 nm. Their spectral bandwidth exceeds 25 THz and is achieved by simultaneous matching of the group velocities (GVs) and cancellation of GV dispersion for the signal and idler field. We provide an intuitive understanding of the process by studying our source’s behavior at different temperatures and pump wavelengths, which agrees well with simulations."}],"issue":"12","publication":"New Journal of Physics","volume":26,"user_id":"78890","publisher":"IOP Publishing","_id":"57862","status":"public","project":[{"_id":"571","name":"MIRAQLS: MIRAQLS: Mid-infrared Quantum Technology for Sensing"},{"name":"E2TPA: Exploiting Entangled Two-Photon Absorption","_id":"190"}],"citation":{"ama":"Roeder F, Gnanavel A, Pollmann R, et al. Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared. New Journal of Physics. 2024;26(12). doi:10.1088/1367-2630/ad9f98","bibtex":"@article{Roeder_Gnanavel_Pollmann_Brecht_Stefszky_Padberg_Eigner_Silberhorn_Brecht_2024, title={Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared}, volume={26}, DOI={10.1088/1367-2630/ad9f98}, number={12123025}, journal={New Journal of Physics}, publisher={IOP Publishing}, author={Roeder, Franz and Gnanavel, Abira and Pollmann, René and Brecht, Olga and Stefszky, Michael and Padberg, Laura and Eigner, Christof and Silberhorn, Christine and Brecht, Benjamin}, year={2024} }","mla":"Roeder, Franz, et al. “Ultra-Broadband Non-Degenerate Guided-Wave Bi-Photon Source in the near and Mid-Infrared.” New Journal of Physics, vol. 26, no. 12, 123025, IOP Publishing, 2024, doi:10.1088/1367-2630/ad9f98.","chicago":"Roeder, Franz, Abira Gnanavel, René Pollmann, Olga Brecht, Michael Stefszky, Laura Padberg, Christof Eigner, Christine Silberhorn, and Benjamin Brecht. “Ultra-Broadband Non-Degenerate Guided-Wave Bi-Photon Source in the near and Mid-Infrared.” New Journal of Physics 26, no. 12 (2024). https://doi.org/10.1088/1367-2630/ad9f98.","short":"F. Roeder, A. Gnanavel, R. Pollmann, O. Brecht, M. Stefszky, L. Padberg, C. Eigner, C. Silberhorn, B. Brecht, New Journal of Physics 26 (2024).","apa":"Roeder, F., Gnanavel, A., Pollmann, R., Brecht, O., Stefszky, M., Padberg, L., Eigner, C., Silberhorn, C., & Brecht, B. (2024). Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared. New Journal of Physics, 26(12), Article 123025. https://doi.org/10.1088/1367-2630/ad9f98","ieee":"F. Roeder et al., “Ultra-broadband non-degenerate guided-wave bi-photon source in the near and mid-infrared,” New Journal of Physics, vol. 26, no. 12, Art. no. 123025, 2024, doi: 10.1088/1367-2630/ad9f98."}},{"citation":{"ieee":"L. Bollmers et al., “Surface-near domain engineering in multi-domain x-cut lithium niobate tantalate mixed crystals,” Applied Physics Letters, vol. 125, no. 15, 2024, doi: 10.1063/5.0210972.","apa":"Bollmers, L., Babai-Hemati, T., Koppitz, B., Eigner, C., Padberg, L., Rüsing, M., Eng, L. M., & Silberhorn, C. (2024). Surface-near domain engineering in multi-domain x-cut lithium niobate tantalate mixed crystals. Applied Physics Letters, 125(15). https://doi.org/10.1063/5.0210972","short":"L. Bollmers, T. Babai-Hemati, B. Koppitz, C. Eigner, L. Padberg, M. Rüsing, L.M. Eng, C. Silberhorn, Applied Physics Letters 125 (2024).","chicago":"Bollmers, Laura, Tobias Babai-Hemati, Boris Koppitz, Christof Eigner, Laura Padberg, Michael Rüsing, Lukas M. Eng, and Christine Silberhorn. “Surface-near Domain Engineering in Multi-Domain x-Cut Lithium Niobate Tantalate Mixed Crystals.” Applied Physics Letters 125, no. 15 (2024). https://doi.org/10.1063/5.0210972.","mla":"Bollmers, Laura, et al. “Surface-near Domain Engineering in Multi-Domain x-Cut Lithium Niobate Tantalate Mixed Crystals.” Applied Physics Letters, vol. 125, no. 15, AIP Publishing, 2024, doi:10.1063/5.0210972.","bibtex":"@article{Bollmers_Babai-Hemati_Koppitz_Eigner_Padberg_Rüsing_Eng_Silberhorn_2024, title={Surface-near domain engineering in multi-domain x-cut lithium niobate tantalate mixed crystals}, volume={125}, DOI={10.1063/5.0210972}, number={15}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Bollmers, Laura and Babai-Hemati, Tobias and Koppitz, Boris and Eigner, Christof and Padberg, Laura and Rüsing, Michael and Eng, Lukas M. and Silberhorn, Christine}, year={2024} }","ama":"Bollmers L, Babai-Hemati T, Koppitz B, et al. Surface-near domain engineering in multi-domain x-cut lithium niobate tantalate mixed crystals. Applied Physics Letters. 2024;125(15). doi:10.1063/5.0210972"},"project":[{"name":"TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)","_id":"168","grant_number":"231447078"}],"status":"public","publisher":"AIP Publishing","_id":"57028","volume":125,"user_id":"61375","publication":"Applied Physics Letters","issue":"15","abstract":[{"text":"Lithium niobate and lithium tantalate are among the most widespread materials for nonlinear, integrated photonics. Mixed crystals with arbitrary Nb–Ta ratios provide an additional degree of freedom to not only tune materials properties, such as the birefringence but also leverage the advantages of the singular compounds, for example, by combining the thermal stability of lithium tantalate with the larger nonlinear or piezoelectric constants of lithium niobate. Periodic poling allows to achieve phase-matching independent of waveguide geometry and is, therefore, one of the commonly used methods in integrated nonlinear optics. For mixed crystals, periodic poling has been challenging so far due to the lack of homogeneous, mono-domain crystals, which severely inhibit domain growth and nucleation. In this work, we investigate surface-near (<1μm depth) domain inversion on x-cut lithium niobate tantalate mixed crystals via electric field poling and lithographically structured electrodes. We find that naturally occurring head-to-head or tail-to-tail domain walls in the as-grown crystal inhibit domain inversion at a larger scale. However, periodic poling is possible if the gap size between the poling electrodes is of the same order of magnitude or smaller than the average size of naturally occurring domains. This work provides the basis for the nonlinear optical application of lithium niobate tantalate mixed crystals.","lang":"eng"}],"date_created":"2024-11-13T08:06:59Z","department":[{"_id":"15"},{"_id":"623"},{"_id":"230"},{"_id":"288"}],"type":"journal_article","publication_identifier":{"issn":["0003-6951","1077-3118"]},"author":[{"last_name":"Bollmers","first_name":"Laura","full_name":"Bollmers, Laura","id":"61375"},{"last_name":"Babai-Hemati","first_name":"Tobias","full_name":"Babai-Hemati, Tobias"},{"first_name":"Boris","last_name":"Koppitz","full_name":"Koppitz, Boris"},{"full_name":"Eigner, Christof","orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","first_name":"Christof","id":"13244"},{"full_name":"Padberg, Laura","last_name":"Padberg","first_name":"Laura","id":"40300"},{"last_name":"Rüsing","first_name":"Michael","orcid":"0000-0003-4682-4577","full_name":"Rüsing, Michael","id":"22501"},{"full_name":"Eng, Lukas M.","first_name":"Lukas M.","last_name":"Eng"},{"id":"26263","first_name":"Christine","last_name":"Silberhorn","full_name":"Silberhorn, Christine"}],"title":"Surface-near domain engineering in multi-domain x-cut lithium niobate tantalate mixed crystals","year":"2024","intvolume":" 125","date_updated":"2024-11-15T09:15:08Z","publication_status":"published","language":[{"iso":"eng"}],"doi":"10.1063/5.0210972"},{"abstract":[{"lang":"eng","text":"Ferroelectric materials play a crucial role in a broad range of technologies due to their unique properties that are deeply connected to the pattern and behavior of their ferroelectric (FE) domains. Chief among them, barium titanate (BaTiO3; BTO) sees widespread applications such as in electronics but equally is a ferroelectric model system for fundamental research, e.g., to study the interplay of such FE domains, the domain walls (DWs), and their macroscopic properties, owed to BTO’s multiple and experimentally accessible phase transitions. Here, we employ Second Harmonic Generation Microscopy (SHGM) to in situ investigate the cubic-to-tetragonal (at ∼126°C) and the tetragonal-to-orthorhombic (at ∼5°C) phase transition in single-crystalline BTO via three-dimensional (3D) DW mapping. We demonstrate that SHGM imaging provides the direct visualization of FE domain switching as well as the domain dynamics in 3D, shedding light on the interplay of the domain structure and phase transition. These results allow us to extract the different transition temperatures locally, to unveil the hysteresis behavior, and to determine the type of phase transition at play (first/second order) from the recorded SHGM data. The capabilities of SHGM in uncovering these crucial phenomena can easily be applied to other ferroelectrics to provide new possibilities for in situ engineering of advanced ferroic devices."}],"issue":"15","publication":"Journal of Applied Physics","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"type":"journal_article","date_created":"2025-04-02T15:57:11Z","article_type":"original","intvolume":" 136","publication_status":"published","date_updated":"2025-04-02T15:59:55Z","author":[{"full_name":"Kirbus, Benjamin","first_name":"Benjamin","last_name":"Kirbus"},{"last_name":"Seddon","first_name":"Samuel D.","full_name":"Seddon, Samuel D."},{"full_name":"Kiseleva, Iuliia","first_name":"Iuliia","last_name":"Kiseleva"},{"last_name":"Beyreuther","first_name":"Elke","full_name":"Beyreuther, Elke"},{"id":"22501","last_name":"Rüsing","first_name":"Michael","orcid":"0000-0003-4682-4577","full_name":"Rüsing, Michael"},{"last_name":"Eng","first_name":"Lukas M.","full_name":"Eng, Lukas M."}],"publication_identifier":{"issn":["0021-8979","1089-7550"]},"year":"2024","title":"Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy","doi":"10.1063/5.0237769","language":[{"iso":"eng"}],"article_number":"154102","main_file_link":[{"open_access":"1","url":" https://doi.org/10.1063/5.0237769"}],"quality_controlled":"1","citation":{"chicago":"Kirbus, Benjamin, Samuel D. Seddon, Iuliia Kiseleva, Elke Beyreuther, Michael Rüsing, and Lukas M. Eng. “Probing Ferroelectric Phase Transitions in Barium Titanate Single Crystals via In-Situ Second Harmonic Generation Microscopy.” Journal of Applied Physics 136, no. 15 (2024). https://doi.org/10.1063/5.0237769.","short":"B. Kirbus, S.D. Seddon, I. Kiseleva, E. Beyreuther, M. Rüsing, L.M. Eng, Journal of Applied Physics 136 (2024).","apa":"Kirbus, B., Seddon, S. D., Kiseleva, I., Beyreuther, E., Rüsing, M., & Eng, L. M. (2024). Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy. Journal of Applied Physics, 136(15), Article 154102. https://doi.org/10.1063/5.0237769","ieee":"B. Kirbus, S. D. Seddon, I. Kiseleva, E. Beyreuther, M. Rüsing, and L. M. Eng, “Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy,” Journal of Applied Physics, vol. 136, no. 15, Art. no. 154102, 2024, doi: 10.1063/5.0237769.","ama":"Kirbus B, Seddon SD, Kiseleva I, Beyreuther E, Rüsing M, Eng LM. Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy. Journal of Applied Physics. 2024;136(15). doi:10.1063/5.0237769","bibtex":"@article{Kirbus_Seddon_Kiseleva_Beyreuther_Rüsing_Eng_2024, title={Probing ferroelectric phase transitions in barium titanate single crystals via in-situ second harmonic generation microscopy}, volume={136}, DOI={10.1063/5.0237769}, number={15154102}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Kirbus, Benjamin and Seddon, Samuel D. and Kiseleva, Iuliia and Beyreuther, Elke and Rüsing, Michael and Eng, Lukas M.}, year={2024} }","mla":"Kirbus, Benjamin, et al. “Probing Ferroelectric Phase Transitions in Barium Titanate Single Crystals via In-Situ Second Harmonic Generation Microscopy.” Journal of Applied Physics, vol. 136, no. 15, 154102, AIP Publishing, 2024, doi:10.1063/5.0237769."},"oa":"1","status":"public","volume":136,"user_id":"22501","_id":"59269","publisher":"AIP Publishing"},{"title":"Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment","year":"2024","publication_identifier":{"issn":["1862-6300","1862-6319"]},"author":[{"full_name":"Bernhardt, Felix","last_name":"Bernhardt","first_name":"Felix"},{"full_name":"Gharat, Soham","last_name":"Gharat","first_name":"Soham"},{"first_name":"Alexander","last_name":"Kapp","full_name":"Kapp, Alexander"},{"full_name":"Pfeiffer, Florian","first_name":"Florian","last_name":"Pfeiffer"},{"full_name":"Buschbeck, Robin","last_name":"Buschbeck","first_name":"Robin"},{"first_name":"Franz","last_name":"Hempel","full_name":"Hempel, Franz"},{"first_name":"Oleksiy","last_name":"Pashkin","full_name":"Pashkin, Oleksiy"},{"last_name":"Kehr","first_name":"Susanne C.","full_name":"Kehr, Susanne C."},{"id":"22501","first_name":"Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","full_name":"Rüsing, Michael"},{"last_name":"Sanna","first_name":"Simone","full_name":"Sanna, Simone"},{"last_name":"Eng","first_name":"Lukas M.","full_name":"Eng, Lukas M."}],"publication_status":"published","date_updated":"2025-04-02T16:07:19Z","intvolume":" 222","main_file_link":[{"url":"https://doi.org/10.1002/pssa.202300968","open_access":"1"}],"language":[{"iso":"eng"}],"doi":"10.1002/pssa.202300968","publication":"physica status solidi (a)","issue":"1","abstract":[{"lang":"eng","text":"Lithium niobate (LNO) and lithium tantalate (LTO) see widespread use in fundamental research and commercial technologies reaching from electronics over classical optics to integrated quantum communication. The mixed crystal system lithium niobate tantalate (LNT) allows for the dedicate engineering of material properties by combining the advantages of the two parental materials LNO and LTO. Vibrational spectroscopies such as Raman spectroscopy or (Fourier transform) infrared (IR) spectroscopy are vital techniques to provide detailed insight into the material properties, which is central to the analysis and optimization of devices. This work presents a joint experimental–theoretical approach allowing to unambiguously assign the spectral features in the LNT material family through both Raman and IR spectroscopy, as well as providing an in‐depth explanation for the observed scattering efficiencies based on first‐principles calculations. The phononic contribution to the static dielectric tensor is calculated from the experimental and theoretical data using the generalized Lyddane–Sachs–Teller relation and compared with the results of the first‐principles calculations."}],"date_created":"2025-04-02T16:04:58Z","type":"journal_article","department":[{"_id":"15"},{"_id":"623"},{"_id":"288"}],"status":"public","page":"2300968","publisher":"Wiley","_id":"59271","user_id":"22501","volume":222,"citation":{"bibtex":"@article{Bernhardt_Gharat_Kapp_Pfeiffer_Buschbeck_Hempel_Pashkin_Kehr_Rüsing_Sanna_et al._2024, title={Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment}, volume={222}, DOI={10.1002/pssa.202300968}, number={1}, journal={physica status solidi (a)}, publisher={Wiley}, author={Bernhardt, Felix and Gharat, Soham and Kapp, Alexander and Pfeiffer, Florian and Buschbeck, Robin and Hempel, Franz and Pashkin, Oleksiy and Kehr, Susanne C. and Rüsing, Michael and Sanna, Simone and et al.}, year={2024}, pages={2300968} }","ama":"Bernhardt F, Gharat S, Kapp A, et al. Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment. physica status solidi (a). 2024;222(1):2300968. doi:10.1002/pssa.202300968","mla":"Bernhardt, Felix, et al. “Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment.” Physica Status Solidi (a), vol. 222, no. 1, Wiley, 2024, p. 2300968, doi:10.1002/pssa.202300968.","short":"F. Bernhardt, S. Gharat, A. Kapp, F. Pfeiffer, R. Buschbeck, F. Hempel, O. Pashkin, S.C. Kehr, M. Rüsing, S. Sanna, L.M. Eng, Physica Status Solidi (a) 222 (2024) 2300968.","chicago":"Bernhardt, Felix, Soham Gharat, Alexander Kapp, Florian Pfeiffer, Robin Buschbeck, Franz Hempel, Oleksiy Pashkin, et al. “Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment.” Physica Status Solidi (a) 222, no. 1 (2024): 2300968. https://doi.org/10.1002/pssa.202300968.","ieee":"F. Bernhardt et al., “Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment,” physica status solidi (a), vol. 222, no. 1, p. 2300968, 2024, doi: 10.1002/pssa.202300968.","apa":"Bernhardt, F., Gharat, S., Kapp, A., Pfeiffer, F., Buschbeck, R., Hempel, F., Pashkin, O., Kehr, S. C., Rüsing, M., Sanna, S., & Eng, L. M. (2024). Lattice Dynamics of LiNb(1–x)Ta(x)O3 Solid Solutions: Theory and Experiment. Physica Status Solidi (a), 222(1), 2300968. https://doi.org/10.1002/pssa.202300968"},"oa":"1"},{"publication":"Journal of Alloys and Compounds","abstract":[{"text":"Lithium niobate tantalate (LiNb1−xTaxO3, LNT) solid solutions offer exciting new possibilities for applications ranging from optics, piezotronics, and electronics beyond the capabilities of the widely used singular compounds of lithium niobate (LiNbO3, LN) or lithium tantalate (LiTaO3, LT). Crystal growth of homogeneous LNT single crystals by the Czochralski method is still challenging. One key aspect of homogeneous growth is the accurate knowledge of thermal conductivity through the crystal boule during the growth, which is central to control the crystal growth. Therefore, the temperature dependent thermal conductivity of pure LN, LT, and LNT solid solutions, as well as of selected doped LN and LT crystals (Mg, Zn) was investigated across the temperature range from 300 to 1300 K. The results that span across the whole composition range can directly be applied for optimizing growth conditions of both LNT solid solutions as well as doped and undoped LN and LT crystals.","lang":"eng"}],"date_created":"2025-04-02T16:00:56Z","department":[{"_id":"15"},{"_id":"288"},{"_id":"623"}],"type":"journal_article","publication_identifier":{"issn":["0925-8388"]},"author":[{"last_name":"Bashir","first_name":"Umar","full_name":"Bashir, Umar"},{"id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","first_name":"Michael"},{"first_name":"Detlef","last_name":"Klimm","full_name":"Klimm, Detlef"},{"full_name":"Blukis, Roberts","last_name":"Blukis","first_name":"Roberts"},{"last_name":"Koppitz","first_name":"Boris","full_name":"Koppitz, Boris"},{"last_name":"Eng","first_name":"Lukas M.","full_name":"Eng, Lukas M."},{"full_name":"Bickermann, Matthias","last_name":"Bickermann","first_name":"Matthias"},{"first_name":"Steffen","last_name":"Ganschow","full_name":"Ganschow, Steffen"}],"title":"Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K","year":"2024","intvolume":" 1008","article_type":"original","date_updated":"2025-04-02T16:02:26Z","publication_status":"published","language":[{"iso":"eng"}],"article_number":"176549","doi":"10.1016/j.jallcom.2024.176549","citation":{"short":"U. Bashir, M. Rüsing, D. Klimm, R. Blukis, B. Koppitz, L.M. Eng, M. Bickermann, S. Ganschow, Journal of Alloys and Compounds 1008 (2024).","chicago":"Bashir, Umar, Michael Rüsing, Detlef Klimm, Roberts Blukis, Boris Koppitz, Lukas M. Eng, Matthias Bickermann, and Steffen Ganschow. “Thermal Conductivity in Solid Solutions of Lithium Niobate Tantalate Single Crystals from 300 K up to 1300 K.” Journal of Alloys and Compounds 1008 (2024). https://doi.org/10.1016/j.jallcom.2024.176549.","ieee":"U. Bashir et al., “Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K,” Journal of Alloys and Compounds, vol. 1008, Art. no. 176549, 2024, doi: 10.1016/j.jallcom.2024.176549.","apa":"Bashir, U., Rüsing, M., Klimm, D., Blukis, R., Koppitz, B., Eng, L. M., Bickermann, M., & Ganschow, S. (2024). Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K. Journal of Alloys and Compounds, 1008, Article 176549. https://doi.org/10.1016/j.jallcom.2024.176549","bibtex":"@article{Bashir_Rüsing_Klimm_Blukis_Koppitz_Eng_Bickermann_Ganschow_2024, title={Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K}, volume={1008}, DOI={10.1016/j.jallcom.2024.176549}, number={176549}, journal={Journal of Alloys and Compounds}, publisher={Elsevier BV}, author={Bashir, Umar and Rüsing, Michael and Klimm, Detlef and Blukis, Roberts and Koppitz, Boris and Eng, Lukas M. and Bickermann, Matthias and Ganschow, Steffen}, year={2024} }","ama":"Bashir U, Rüsing M, Klimm D, et al. Thermal conductivity in solid solutions of lithium niobate tantalate single crystals from 300 K up to 1300 K. Journal of Alloys and Compounds. 2024;1008. doi:10.1016/j.jallcom.2024.176549","mla":"Bashir, Umar, et al. “Thermal Conductivity in Solid Solutions of Lithium Niobate Tantalate Single Crystals from 300 K up to 1300 K.” Journal of Alloys and Compounds, vol. 1008, 176549, Elsevier BV, 2024, doi:10.1016/j.jallcom.2024.176549."},"quality_controlled":"1","status":"public","_id":"59270","publisher":"Elsevier BV","volume":1008,"user_id":"22501"},{"title":"Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls","year":"2024","author":[{"last_name":"Verhoff","first_name":"Leonard M.","full_name":"Verhoff, Leonard M."},{"first_name":"Mike N.","last_name":"Pionteck","full_name":"Pionteck, Mike N."},{"id":"22501","full_name":"Rüsing, Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael"},{"full_name":"Fritze, Holger","first_name":"Holger","last_name":"Fritze"},{"full_name":"Eng, Lukas M.","first_name":"Lukas M.","last_name":"Eng"},{"first_name":"Simone","last_name":"Sanna","full_name":"Sanna, Simone"}],"publication_identifier":{"issn":["2643-1564"]},"publication_status":"published","date_updated":"2025-04-02T16:10:59Z","intvolume":" 6","article_number":"L042015","main_file_link":[{"url":"https://jlupub.ub.uni-giessen.de/server/api/core/bitstreams/fb2b09e6-c0f8-4209-99a1-79fc81d9b1f9/content"}],"language":[{"iso":"eng"}],"doi":"10.1103/physrevresearch.6.l042015","publication":"Physical Review Research","issue":"4","abstract":[{"lang":"eng","text":"Ferroelectrics such as LiNbO3 (LN) are wide-band-gap insulators that may show a high local electric conductivity at the domain walls (DWs). The latter are interfaces separating regions of noncollinear polarization, which can be manipulated to build integrated nanoelectronic elements. In the present work, we model different DW types in LN from first principles. Our models reveal the DW morphology and shed light on their electronic properties: A strong band bending is predicted for charged DWs, leading to local metallicity. Defect trapping at the DW may further enhance the electric conductivity."}],"date_created":"2025-04-02T16:08:55Z","type":"journal_article","department":[{"_id":"623"},{"_id":"288"},{"_id":"15"}],"status":"public","_id":"59272","publisher":"American Physical Society (APS)","user_id":"22501","volume":6,"citation":{"short":"L.M. Verhoff, M.N. Pionteck, M. Rüsing, H. Fritze, L.M. Eng, S. Sanna, Physical Review Research 6 (2024).","chicago":"Verhoff, Leonard M., Mike N. Pionteck, Michael Rüsing, Holger Fritze, Lukas M. Eng, and Simone Sanna. “Two-Dimensional Electronic Conductivity in Insulating Ferroelectrics: Peculiar Properties of Domain Walls.” Physical Review Research 6, no. 4 (2024). https://doi.org/10.1103/physrevresearch.6.l042015.","apa":"Verhoff, L. M., Pionteck, M. N., Rüsing, M., Fritze, H., Eng, L. M., & Sanna, S. (2024). Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls. Physical Review Research, 6(4), Article L042015. https://doi.org/10.1103/physrevresearch.6.l042015","ieee":"L. M. Verhoff, M. N. Pionteck, M. Rüsing, H. Fritze, L. M. Eng, and S. Sanna, “Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls,” Physical Review Research, vol. 6, no. 4, Art. no. L042015, 2024, doi: 10.1103/physrevresearch.6.l042015.","ama":"Verhoff LM, Pionteck MN, Rüsing M, Fritze H, Eng LM, Sanna S. Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls. Physical Review Research. 2024;6(4). doi:10.1103/physrevresearch.6.l042015","bibtex":"@article{Verhoff_Pionteck_Rüsing_Fritze_Eng_Sanna_2024, title={Two-dimensional electronic conductivity in insulating ferroelectrics: Peculiar properties of domain walls}, volume={6}, DOI={10.1103/physrevresearch.6.l042015}, number={4L042015}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Verhoff, Leonard M. and Pionteck, Mike N. and Rüsing, Michael and Fritze, Holger and Eng, Lukas M. and Sanna, Simone}, year={2024} }","mla":"Verhoff, Leonard M., et al. “Two-Dimensional Electronic Conductivity in Insulating Ferroelectrics: Peculiar Properties of Domain Walls.” Physical Review Research, vol. 6, no. 4, L042015, American Physical Society (APS), 2024, doi:10.1103/physrevresearch.6.l042015."}},{"abstract":[{"lang":"eng","text":"Ferroelectric domain walls (DWs) are promising structures for assembling future nano-electronic circuit elements on a larger scale since reporting domain wall currents of up to 1 mA per single DW. One key requirement hereto is their reproducible manufacturing by gaining preparative control over domain size and domain wall conductivity (DWC). To date, most works on DWC have focused on exploring the fundamental electrical properties of individual DWs within single-shot experiments, with an emphasis on quantifying the origins of DWC. Very few reports exist when it comes to comparing the DWC properties between two separate DWs, and literally nothing exists where issues of reproducibility in DWC devices have been addressed. To fill this gap while facing the challenge of finding guidelines for achieving predictable DWC performance, we report on a procedure that allows us to reproducibly prepare single hexagonal domains of a predefined diameter into uniaxial ferroelectric lithium niobate single crystals of 200 and 300 μm thickness, respectively. We show that the domain diameter can be controlled with an uncertainty of a few percent. As-grown DWs are then subjected to a standard procedure of current-limited high-voltage DWC enhancement, and they repetitively reach a DWC increase of six orders of magnitude. While all resulting DWs show significantly enhanced DWC values, their individual current–voltage (I–V) characteristics exhibit different shapes, which can be explained by variations in their 3D real structure reflecting local heterogeneities by defects, DW pinning, and surface-near DW inclination."}],"issue":"10","publication":"Journal of Applied Physics","type":"journal_article","department":[{"_id":"288"},{"_id":"15"},{"_id":"623"}],"date_created":"2025-04-02T16:12:29Z","publication_status":"published","date_updated":"2025-04-02T16:14:31Z","article_type":"original","intvolume":" 136","title":"Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals","year":"2024","author":[{"full_name":"Ratzenberger, Julius","last_name":"Ratzenberger","first_name":"Julius"},{"first_name":"Iuliia","last_name":"Kiseleva","full_name":"Kiseleva, Iuliia"},{"full_name":"Koppitz, Boris","first_name":"Boris","last_name":"Koppitz"},{"last_name":"Beyreuther","first_name":"Elke","full_name":"Beyreuther, Elke"},{"full_name":"Zahn, Manuel","last_name":"Zahn","first_name":"Manuel"},{"full_name":"Gössel, Joshua","last_name":"Gössel","first_name":"Joshua"},{"last_name":"Hegarty","first_name":"Peter A.","full_name":"Hegarty, Peter A."},{"first_name":"Zeeshan H.","last_name":"Amber","full_name":"Amber, Zeeshan H."},{"first_name":"Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","full_name":"Rüsing, Michael","id":"22501"},{"last_name":"Eng","first_name":"Lukas M.","full_name":"Eng, Lukas M."}],"publication_identifier":{"issn":["0021-8979","1089-7550"]},"doi":"10.1063/5.0219300","main_file_link":[{"url":" https://doi.org/10.1063/5.0219300","open_access":"1"}],"language":[{"iso":"eng"}],"quality_controlled":"1","citation":{"ieee":"J. Ratzenberger et al., “Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals,” Journal of Applied Physics, vol. 136, no. 10, p. 104302, 2024, doi: 10.1063/5.0219300.","apa":"Ratzenberger, J., Kiseleva, I., Koppitz, B., Beyreuther, E., Zahn, M., Gössel, J., Hegarty, P. A., Amber, Z. H., Rüsing, M., & Eng, L. M. (2024). Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals. Journal of Applied Physics, 136(10), 104302. https://doi.org/10.1063/5.0219300","chicago":"Ratzenberger, Julius, Iuliia Kiseleva, Boris Koppitz, Elke Beyreuther, Manuel Zahn, Joshua Gössel, Peter A. Hegarty, Zeeshan H. Amber, Michael Rüsing, and Lukas M. Eng. “Toward the Reproducible Fabrication of Conductive Ferroelectric Domain Walls into Lithium Niobate Bulk Single Crystals.” Journal of Applied Physics 136, no. 10 (2024): 104302. https://doi.org/10.1063/5.0219300.","short":"J. Ratzenberger, I. Kiseleva, B. Koppitz, E. Beyreuther, M. Zahn, J. Gössel, P.A. Hegarty, Z.H. Amber, M. Rüsing, L.M. Eng, Journal of Applied Physics 136 (2024) 104302.","mla":"Ratzenberger, Julius, et al. “Toward the Reproducible Fabrication of Conductive Ferroelectric Domain Walls into Lithium Niobate Bulk Single Crystals.” Journal of Applied Physics, vol. 136, no. 10, AIP Publishing, 2024, p. 104302, doi:10.1063/5.0219300.","bibtex":"@article{Ratzenberger_Kiseleva_Koppitz_Beyreuther_Zahn_Gössel_Hegarty_Amber_Rüsing_Eng_2024, title={Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals}, volume={136}, DOI={10.1063/5.0219300}, number={10}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Ratzenberger, Julius and Kiseleva, Iuliia and Koppitz, Boris and Beyreuther, Elke and Zahn, Manuel and Gössel, Joshua and Hegarty, Peter A. and Amber, Zeeshan H. and Rüsing, Michael and Eng, Lukas M.}, year={2024}, pages={104302} }","ama":"Ratzenberger J, Kiseleva I, Koppitz B, et al. Toward the reproducible fabrication of conductive ferroelectric domain walls into lithium niobate bulk single crystals. Journal of Applied Physics. 2024;136(10):104302. doi:10.1063/5.0219300"},"oa":"1","status":"public","user_id":"22501","volume":136,"page":"104302","_id":"59273","publisher":"AIP Publishing"},{"author":[{"last_name":"Lee","first_name":"Cherrie S. J.","full_name":"Lee, Cherrie S. J."},{"last_name":"Canalias","first_name":"Carlota","full_name":"Canalias, Carlota"},{"last_name":"Buschbeck","first_name":"Robin","full_name":"Buschbeck, Robin"},{"full_name":"Koppitz, Boris","first_name":"Boris","last_name":"Koppitz"},{"last_name":"Hempel","first_name":"Franz","full_name":"Hempel, Franz"},{"full_name":"Amber, Zeeshan","first_name":"Zeeshan","last_name":"Amber"},{"first_name":"Lukas M.","last_name":"Eng","full_name":"Eng, Lukas M."},{"last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael","full_name":"Rüsing, Michael","id":"22501"}],"publication_identifier":{"issn":["2469-9950","2469-9969"]},"title":"Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching","year":"2024","intvolume":" 110","article_type":"original","date_updated":"2025-04-02T16:18:34Z","publication_status":"published","language":[{"iso":"eng"}],"article_number":"214115","doi":"10.1103/physrevb.110.214115","issue":"21","publication":"Physical Review B","abstract":[{"text":"Recently, ion exchange (IE) has been used to periodically modify the coercive field (Ec) of the crystal prior to periodic poling, to fabricate fine-pitch domain structures in Rb-doped KTiOPO4 (RKTP). Here, we use micro-Raman spectroscopy to understand the impact of IE on the vibrational modes related to the Rb/K lattice sites, TiO octahedra, and PO4 tetrahedra, which all form the basis of the RKTP crystal structure. We analyze the Raman spectra of three different RKTP samples: (1) a RKTP sample that shows a poled domain grating only, (2) a RKTP sample that has an Ec grating only, and (3) a RKTP sample that has both an Ec and a domain grating of the nominally same spacing. This allows us to determine the impact of IE on the vibrational modes of RKTP. We characterize the changes in the lower Raman peaks related to the alkali-metal ions, as well as observe lattice modifications induced by the incorporation of Rb+ that extend further into the crystal bulk than the expected IE depth. Moreover, the influence of IE on the domain walls is also manifested in their Raman peak shift. We discuss our results in terms of the deformation of the PO4and TiO groups. Our results highlight the intricate impact of IE on the crystal structure and how it facilitates periodic poling, paving the way for further development of the Ec-engineering technique.","lang":"eng"}],"date_created":"2025-04-02T16:14:44Z","department":[{"_id":"288"},{"_id":"15"},{"_id":"623"}],"type":"journal_article","status":"public","publisher":"American Physical Society (APS)","_id":"59274","volume":110,"user_id":"22501","citation":{"ama":"Lee CSJ, Canalias C, Buschbeck R, et al. Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching. Physical Review B. 2024;110(21). doi:10.1103/physrevb.110.214115","bibtex":"@article{Lee_Canalias_Buschbeck_Koppitz_Hempel_Amber_Eng_Rüsing_2024, title={Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching}, volume={110}, DOI={10.1103/physrevb.110.214115}, number={21214115}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Lee, Cherrie S. J. and Canalias, Carlota and Buschbeck, Robin and Koppitz, Boris and Hempel, Franz and Amber, Zeeshan and Eng, Lukas M. and Rüsing, Michael}, year={2024} }","mla":"Lee, Cherrie S. J., et al. “Impact of Ion Exchange on Vibrational Modes in Rb-Doped KTiOPO4: A Raman Spectroscopy Study on the Interplay between Ion Exchange and Polarization Switching.” Physical Review B, vol. 110, no. 21, 214115, American Physical Society (APS), 2024, doi:10.1103/physrevb.110.214115.","short":"C.S.J. Lee, C. Canalias, R. Buschbeck, B. Koppitz, F. Hempel, Z. Amber, L.M. Eng, M. Rüsing, Physical Review B 110 (2024).","chicago":"Lee, Cherrie S. J., Carlota Canalias, Robin Buschbeck, Boris Koppitz, Franz Hempel, Zeeshan Amber, Lukas M. Eng, and Michael Rüsing. “Impact of Ion Exchange on Vibrational Modes in Rb-Doped KTiOPO4: A Raman Spectroscopy Study on the Interplay between Ion Exchange and Polarization Switching.” Physical Review B 110, no. 21 (2024). https://doi.org/10.1103/physrevb.110.214115.","apa":"Lee, C. S. J., Canalias, C., Buschbeck, R., Koppitz, B., Hempel, F., Amber, Z., Eng, L. M., & Rüsing, M. (2024). Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching. Physical Review B, 110(21), Article 214115. https://doi.org/10.1103/physrevb.110.214115","ieee":"C. S. J. Lee et al., “Impact of ion exchange on vibrational modes in Rb-doped KTiOPO4: A Raman spectroscopy study on the interplay between ion exchange and polarization switching,” Physical Review B, vol. 110, no. 21, Art. no. 214115, 2024, doi: 10.1103/physrevb.110.214115."}}]