[{"type":"conference","status":"public","_id":"47950","user_id":"22501","article_number":"FTu6A.3","language":[{"iso":"eng"}],"extern":"1","publication_identifier":{"unknown":["978-1-943580-67-5"]},"publication_status":"published","year":"2019","citation":{"mla":"Zhao, Jie, et al. <i>High-Quality Photon-Pair and Heralded Single-Photon Generation Using Periodically-Poled Thin-Film Lithium Niobate</i>. FTu6A.3, 2019, doi:<a href=\"https://doi.org/10.1364/FIO.2019.FTu6A.3\">10.1364/FIO.2019.FTu6A.3</a>.","short":"J. Zhao, C. Ma, M. Rüsing, S. Mookherjea, in: 2019.","bibtex":"@inproceedings{Zhao_Ma_Rüsing_Mookherjea_2019, title={High-quality photon-pair and heralded single-photon generation using periodically-poled thin-film lithium niobate}, DOI={<a href=\"https://doi.org/10.1364/FIO.2019.FTu6A.3\">10.1364/FIO.2019.FTu6A.3</a>}, number={FTu6A.3}, author={Zhao, Jie and Ma, Chaoxuan and Rüsing, Michael and Mookherjea, Shayan}, year={2019} }","apa":"Zhao, J., Ma, C., Rüsing, M., &#38; Mookherjea, S. (2019). <i>High-quality photon-pair and heralded single-photon generation using periodically-poled thin-film lithium niobate</i> (FTu6A.3). Article FTu6A.3. Frontiers in Optics 2019, Washington, D.C., USA. <a href=\"https://doi.org/10.1364/FIO.2019.FTu6A.3\">https://doi.org/10.1364/FIO.2019.FTu6A.3</a>","ama":"Zhao J, Ma C, Rüsing M, Mookherjea S. High-quality photon-pair and heralded single-photon generation using periodically-poled thin-film lithium niobate. In: ; 2019. doi:<a href=\"https://doi.org/10.1364/FIO.2019.FTu6A.3\">10.1364/FIO.2019.FTu6A.3</a>","chicago":"Zhao, Jie, Chaoxuan Ma, Michael Rüsing, and Shayan Mookherjea. “High-Quality Photon-Pair and Heralded Single-Photon Generation Using Periodically-Poled Thin-Film Lithium Niobate,” 2019. <a href=\"https://doi.org/10.1364/FIO.2019.FTu6A.3\">https://doi.org/10.1364/FIO.2019.FTu6A.3</a>.","ieee":"J. Zhao, C. Ma, M. Rüsing, and S. Mookherjea, “High-quality photon-pair and heralded single-photon generation using periodically-poled thin-film lithium niobate,” presented at the Frontiers in Optics 2019, Washington, D.C., USA, 2019, doi: <a href=\"https://doi.org/10.1364/FIO.2019.FTu6A.3\">10.1364/FIO.2019.FTu6A.3</a>."},"date_updated":"2023-10-11T15:50:00Z","date_created":"2023-10-11T07:46:12Z","author":[{"first_name":"Jie","full_name":"Zhao, Jie","last_name":"Zhao"},{"first_name":"Chaoxuan","last_name":"Ma","full_name":"Ma, Chaoxuan"},{"first_name":"Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","full_name":"Rüsing, Michael","id":"22501"},{"first_name":"Shayan","last_name":"Mookherjea","full_name":"Mookherjea, Shayan"}],"title":"High-quality photon-pair and heralded single-photon generation using periodically-poled thin-film lithium niobate","conference":{"start_date":"2019-09-15","name":"Frontiers in Optics 2019","location":"Washington, D.C., USA","end_date":"2019-09-19"},"doi":"10.1364/FIO.2019.FTu6A.3"},{"intvolume":"         2","citation":{"ama":"Rüsing M, Neufeld S, Brockmeier J, et al. Imaging of 180∘ ferroelectric domain walls in uniaxial ferroelectrics by confocal Raman spectroscopy: Unraveling the contrast mechanism. <i>Physical Review Materials</i>. 2018;2(10). doi:<a href=\"https://doi.org/10.1103/physrevmaterials.2.103801\">10.1103/physrevmaterials.2.103801</a>","chicago":"Rüsing, Michael, Sergej Neufeld, Julian Brockmeier, Christof Eigner, P. Mackwitz, K. Spychala, Christine Silberhorn, et al. “Imaging of 180∘ Ferroelectric Domain Walls in Uniaxial Ferroelectrics by Confocal Raman Spectroscopy: Unraveling the Contrast Mechanism.” <i>Physical Review Materials</i> 2, no. 10 (2018). <a href=\"https://doi.org/10.1103/physrevmaterials.2.103801\">https://doi.org/10.1103/physrevmaterials.2.103801</a>.","ieee":"M. Rüsing <i>et al.</i>, “Imaging of 180∘ ferroelectric domain walls in uniaxial ferroelectrics by confocal Raman spectroscopy: Unraveling the contrast mechanism,” <i>Physical Review Materials</i>, vol. 2, no. 10, 2018, doi: <a href=\"https://doi.org/10.1103/physrevmaterials.2.103801\">10.1103/physrevmaterials.2.103801</a>.","apa":"Rüsing, M., Neufeld, S., Brockmeier, J., Eigner, C., Mackwitz, P., Spychala, K., Silberhorn, C., Schmidt, W. G., Berth, G., Zrenner, A., &#38; Sanna, S. (2018). Imaging of 180∘ ferroelectric domain walls in uniaxial ferroelectrics by confocal Raman spectroscopy: Unraveling the contrast mechanism. <i>Physical Review Materials</i>, <i>2</i>(10). <a href=\"https://doi.org/10.1103/physrevmaterials.2.103801\">https://doi.org/10.1103/physrevmaterials.2.103801</a>","short":"M. Rüsing, S. Neufeld, J. Brockmeier, C. Eigner, P. Mackwitz, K. Spychala, C. Silberhorn, W.G. Schmidt, G. Berth, A. Zrenner, S. Sanna, Physical Review Materials 2 (2018).","mla":"Rüsing, Michael, et al. “Imaging of 180∘ Ferroelectric Domain Walls in Uniaxial Ferroelectrics by Confocal Raman Spectroscopy: Unraveling the Contrast Mechanism.” <i>Physical Review Materials</i>, vol. 2, no. 10, American Physical Society (APS), 2018, doi:<a href=\"https://doi.org/10.1103/physrevmaterials.2.103801\">10.1103/physrevmaterials.2.103801</a>.","bibtex":"@article{Rüsing_Neufeld_Brockmeier_Eigner_Mackwitz_Spychala_Silberhorn_Schmidt_Berth_Zrenner_et al._2018, title={Imaging of 180∘ ferroelectric domain walls in uniaxial ferroelectrics by confocal Raman spectroscopy: Unraveling the contrast mechanism}, volume={2}, DOI={<a href=\"https://doi.org/10.1103/physrevmaterials.2.103801\">10.1103/physrevmaterials.2.103801</a>}, number={10}, journal={Physical Review Materials}, publisher={American Physical Society (APS)}, author={Rüsing, Michael and Neufeld, Sergej and Brockmeier, Julian and Eigner, Christof and Mackwitz, P. and Spychala, K. and Silberhorn, Christine and Schmidt, Wolf Gero and Berth, Gerhard and Zrenner, Artur and et al.}, year={2018} }"},"year":"2018","issue":"10","publication_identifier":{"issn":["2475-9953"]},"publication_status":"published","doi":"10.1103/physrevmaterials.2.103801","title":"Imaging of 180∘ ferroelectric domain walls in uniaxial ferroelectrics by confocal Raman spectroscopy: Unraveling the contrast mechanism","volume":2,"date_created":"2018-10-18T08:50:47Z","author":[{"first_name":"Michael","last_name":"Rüsing","orcid":"0000-0003-4682-4577","full_name":"Rüsing, Michael","id":"22501"},{"full_name":"Neufeld, Sergej","id":"23261","last_name":"Neufeld","first_name":"Sergej"},{"first_name":"Julian","last_name":"Brockmeier","full_name":"Brockmeier, Julian","id":"44807"},{"first_name":"Christof","id":"13244","full_name":"Eigner, Christof","last_name":"Eigner","orcid":"https://orcid.org/0000-0002-5693-3083"},{"full_name":"Mackwitz, P.","last_name":"Mackwitz","first_name":"P."},{"full_name":"Spychala, K.","last_name":"Spychala","first_name":"K."},{"first_name":"Christine","full_name":"Silberhorn, Christine","id":"26263","last_name":"Silberhorn"},{"first_name":"Wolf Gero","full_name":"Schmidt, Wolf Gero","id":"468","last_name":"Schmidt","orcid":"0000-0002-2717-5076"},{"first_name":"Gerhard","id":"53","full_name":"Berth, Gerhard","last_name":"Berth"},{"full_name":"Zrenner, Artur","id":"606","orcid":"0000-0002-5190-0944","last_name":"Zrenner","first_name":"Artur"},{"last_name":"Sanna","full_name":"Sanna, S.","first_name":"S."}],"date_updated":"2023-10-11T09:01:48Z","publisher":"American Physical Society (APS)","status":"public","abstract":[{"text":"In recent years, Raman spectroscopy has been used to visualize and analyze ferroelectric domain structures.\r\nThe technique makes use of the fact that the intensity or frequency of certain phonons is strongly influenced\r\nby the presence of domain walls. Although the method is used frequently, the underlying mechanism responsible\r\nfor the changes in the spectra is not fully understood. This inhibits deeper analysis of domain structures based\r\non this method. Two different models have been proposed. However, neither model completely explains all\r\nobservations. In this work, we have systematically investigated domain walls in different scattering geometries\r\nwith Raman spectroscopy in the common ferroelectric materials used in integrated optics, i.e., KTiOPO4,\r\nLiNbO3, and LiTaO3. Based on the two models, we can demonstrate that the observed contrast for domain\r\nwalls is in fact based on two different effects. We can identify on the one hand microscopic changes at the\r\ndomain wall, e.g., strain and electric fields, and on the other hand a macroscopic change of selection rules at the\r\ndomain wall. While the macroscopic relaxation of selection rules can be explained by the directional dispersion\r\nof the phonons in agreement with previous propositions, the microscopic changes can be explained qualitatively\r\nin terms of a simplified atomistic model.","lang":"eng"}],"publication":"Physical Review Materials","type":"journal_article","language":[{"iso":"eng"}],"article_type":"original","department":[{"_id":"15"},{"_id":"230"},{"_id":"35"},{"_id":"288"}],"user_id":"22501","_id":"4769","project":[{"name":"TRR 142","_id":"53","grant_number":"231447078"},{"_id":"55","name":"TRR 142 - Project Area B"},{"name":"TRR 142 - Subproject B4","_id":"69","grant_number":"231447078"},{"grant_number":"231447078","_id":"70","name":"TRR 142 - Subproject B5"}]},{"place":"Paderborn","year":"2018","citation":{"ieee":"M. Rüsing, <i>In depth Raman analysis of the ferroelectrics KTiOPO4 and LiNbO3: role of domain boundaries and defect</i>. Paderborn: Universitätsbibliothek Paderborn, 2018.","chicago":"Rüsing, Michael. <i>In Depth Raman Analysis of the Ferroelectrics KTiOPO4 and LiNbO3: Role of Domain Boundaries and Defect</i>. Paderborn: Universitätsbibliothek Paderborn, 2018. <a href=\"https://doi.org/10.17619/UNIPB/1-282\">https://doi.org/10.17619/UNIPB/1-282</a>.","ama":"Rüsing M. <i>In Depth Raman Analysis of the Ferroelectrics KTiOPO4 and LiNbO3: Role of Domain Boundaries and Defect</i>. Universitätsbibliothek Paderborn; 2018. doi:<a href=\"https://doi.org/10.17619/UNIPB/1-282\">10.17619/UNIPB/1-282</a>","apa":"Rüsing, M. (2018). <i>In depth Raman analysis of the ferroelectrics KTiOPO4 and LiNbO3: role of domain boundaries and defect</i>. Universitätsbibliothek Paderborn. <a href=\"https://doi.org/10.17619/UNIPB/1-282\">https://doi.org/10.17619/UNIPB/1-282</a>","mla":"Rüsing, Michael. <i>In Depth Raman Analysis of the Ferroelectrics KTiOPO4 and LiNbO3: Role of Domain Boundaries and Defect</i>. Universitätsbibliothek Paderborn, 2018, doi:<a href=\"https://doi.org/10.17619/UNIPB/1-282\">10.17619/UNIPB/1-282</a>.","short":"M. Rüsing, In Depth Raman Analysis of the Ferroelectrics KTiOPO4 and LiNbO3: Role of Domain Boundaries and Defect, Universitätsbibliothek Paderborn, Paderborn, 2018.","bibtex":"@book{Rüsing_2018, place={Paderborn}, title={In depth Raman analysis of the ferroelectrics KTiOPO4 and LiNbO3: role of domain boundaries and defect}, DOI={<a href=\"https://doi.org/10.17619/UNIPB/1-282\">10.17619/UNIPB/1-282</a>}, publisher={Universitätsbibliothek Paderborn}, author={Rüsing, Michael}, year={2018} }"},"title":"In depth Raman analysis of the ferroelectrics KTiOPO4 and LiNbO3: role of domain boundaries and defect","doi":"10.17619/UNIPB/1-282","main_file_link":[{"url":"https://doi.org/10.17619/UNIPB/1-282","open_access":"1"}],"oa":"1","date_updated":"2023-10-11T15:50:28Z","publisher":"Universitätsbibliothek Paderborn","date_created":"2023-10-11T07:35:58Z","author":[{"full_name":"Rüsing, Michael","id":"22501","last_name":"Rüsing","orcid":"0000-0003-4682-4577","first_name":"Michael"}],"abstract":[{"text":"In the context of ferroelectrics spatially resolved Raman spectroscopy is a powerful tool to investigate stoichiometry, defects or the ferroelectric properties, as well as to visualize domain structures or waveguides. Using Raman spectroscopy for investigations requires a throughout understanding of the spectra and underlying mechanisms. For example, in the context of the common nonlinear materials, lithium niobate and potassium titanyl phosphate, no comprehensive understanding of the Raman spectra of the bulk materials is available, while the underlying mechanism of the domain wall contrast in Raman spectroscopy is not well understood. In this work, questions like these have been addressed in terms of systematic experimental investigations in close cooperation with density functional theory. In particular, it was possible to present a complete assignment of all phonons in the lithium niobate system, which serves as the basis for the understanding of the domain wall spectrum. Here, the domain wall spectrum can be explained with regard to microscopic structural effects, such as strains and electric fields, as well as a macroscopic change of selections rules. Both mechanisms are likewise present in the domain wall spectrum, while being present at different length scales. In the context of potassium titanyl phosphate the first throughout Raman investigations of domain structure, waveguides and periodically poled waveguides are presented. In the context of Rb-exchanged waveguides the change in stoichiometry, but also effects of strain are detected. Here, the Raman analysis provides a method to evaluate these effects.","lang":"eng"}],"status":"public","type":"dissertation","language":[{"iso":"eng"}],"_id":"47944","department":[{"_id":"15"}],"user_id":"22501"},{"language":[{"iso":"eng"}],"article_type":"original","user_id":"14931","department":[{"_id":"15"},{"_id":"230"},{"_id":"35"}],"project":[{"_id":"53","name":"TRR 142","grant_number":"231447078"},{"_id":"55","name":"TRR 142 - Project Area B"},{"name":"TRR 142 - Subproject B3","_id":"68","grant_number":"231447078"}],"_id":"3434","status":"public","abstract":[{"text":"In this work we study the impact of ion implantation on the nonlinear optical properties in MgO:LiNbO3 via confocal second-harmonic microscopy. In detail, we spatially characterize the nonlinear susceptibility in carbon-ion implanted lithium niobate planar waveguides for different implantation energies and fluences, as well as the effect of annealing. In a further step, a computational simulation is used to calculate the implantation range of carbon-ions and the corresponding defect density distribution. A comparison between the simulation and the experimental data indicates that the depth profile of the second-order effective nonlinear coefficient is directly connected to the defect density that is induced by the ion irradiation. Furthermore it can be demonstrated that the annealing treatment partially recovers the second-order optical susceptibility.","lang":"eng"}],"type":"journal_article","publication":"OPTICS EXPRESS","doi":"10.1364/OE.25.021444","title":"Impact of carbon-ion implantation on the nonlinear optical susceptibility of LiNbO3","author":[{"first_name":"Kai J.","last_name":"Spychala","full_name":"Spychala, Kai J."},{"last_name":"Berth","id":"53","full_name":"Berth, Gerhard","first_name":"Gerhard"},{"first_name":"Alex","last_name":"Widhalm","full_name":"Widhalm, Alex"},{"last_name":"Rüsing","orcid":"0000-0003-4682-4577","full_name":"Rüsing, Michael","id":"22501","first_name":"Michael"},{"full_name":"Wang, Lei","last_name":"Wang","first_name":"Lei"},{"last_name":"Sanna","full_name":"Sanna, Simone","first_name":"Simone"},{"first_name":"Artur","last_name":"Zrenner","orcid":"0000-0002-5190-0944","full_name":"Zrenner, Artur","id":"606"}],"date_created":"2018-07-05T11:53:46Z","date_updated":"2023-10-09T08:10:58Z","citation":{"ieee":"K. J. Spychala <i>et al.</i>, “Impact of carbon-ion implantation on the nonlinear optical susceptibility of LiNbO3,” <i>OPTICS EXPRESS</i>, no. 18, pp. 21444--21453, 2017, doi: <a href=\"https://doi.org/10.1364/OE.25.021444\">10.1364/OE.25.021444</a>.","chicago":"Spychala, Kai J., Gerhard Berth, Alex Widhalm, Michael Rüsing, Lei Wang, Simone Sanna, and Artur Zrenner. “Impact of Carbon-Ion Implantation on the Nonlinear Optical Susceptibility of LiNbO3.” <i>OPTICS EXPRESS</i>, no. 18 (2017): 21444--21453. <a href=\"https://doi.org/10.1364/OE.25.021444\">https://doi.org/10.1364/OE.25.021444</a>.","ama":"Spychala KJ, Berth G, Widhalm A, et al. Impact of carbon-ion implantation on the nonlinear optical susceptibility of LiNbO3. <i>OPTICS EXPRESS</i>. 2017;(18):21444--21453. doi:<a href=\"https://doi.org/10.1364/OE.25.021444\">10.1364/OE.25.021444</a>","apa":"Spychala, K. J., Berth, G., Widhalm, A., Rüsing, M., Wang, L., Sanna, S., &#38; Zrenner, A. (2017). Impact of carbon-ion implantation on the nonlinear optical susceptibility of LiNbO3. <i>OPTICS EXPRESS</i>, <i>18</i>, 21444--21453. <a href=\"https://doi.org/10.1364/OE.25.021444\">https://doi.org/10.1364/OE.25.021444</a>","bibtex":"@article{Spychala_Berth_Widhalm_Rüsing_Wang_Sanna_Zrenner_2017, title={Impact of carbon-ion implantation on the nonlinear optical susceptibility of LiNbO3}, DOI={<a href=\"https://doi.org/10.1364/OE.25.021444\">10.1364/OE.25.021444</a>}, number={18}, journal={OPTICS EXPRESS}, author={Spychala, Kai J. and Berth, Gerhard and Widhalm, Alex and Rüsing, Michael and Wang, Lei and Sanna, Simone and Zrenner, Artur}, year={2017}, pages={21444--21453} }","mla":"Spychala, Kai J., et al. “Impact of Carbon-Ion Implantation on the Nonlinear Optical Susceptibility of LiNbO3.” <i>OPTICS EXPRESS</i>, no. 18, 2017, pp. 21444--21453, doi:<a href=\"https://doi.org/10.1364/OE.25.021444\">10.1364/OE.25.021444</a>.","short":"K.J. Spychala, G. Berth, A. Widhalm, M. Rüsing, L. Wang, S. Sanna, A. Zrenner, OPTICS EXPRESS (2017) 21444--21453."},"page":"21444--21453","year":"2017","issue":"18","publication_status":"published","publication_identifier":{"issn":["1094-4087"]}},{"project":[{"_id":"53","name":"TRR 142","grant_number":"231447078"},{"_id":"55","name":"TRR 142 - Project Area B"},{"grant_number":"231447078","name":"TRR 142 - Subproject B3","_id":"68"}],"_id":"4239","user_id":"14931","department":[{"_id":"15"},{"_id":"230"},{"_id":"35"},{"_id":"288"}],"article_number":"044103","article_type":"original","language":[{"iso":"eng"}],"type":"journal_article","publication":"Journal of Applied Physics","abstract":[{"lang":"eng","text":"Confocal Raman spectroscopy is applied to identify ferroelectric domain structure sensitive\r\nphonon modes in potassium titanyl phosphate. Therefore, polarization-dependent measurements in\r\nvarious scattering configurations have been performed to characterize the fundamental Raman\r\nspectra of the material. The obtained spectra are discussed qualitatively based on an internal mode\r\nassignment. In the main part of this work, we have characterized z-cut periodically poled potassium\r\ntitanyl phosphate in terms of polarity- and structure-sensitive phonon modes. Here, we find vibrations\r\nwhose intensities are linked to the ferroelectric domain walls. We interpret this in terms of\r\nchanges in the polarizability originating from strain induced by domain boundaries and the inner\r\nfield distribution. Hence, a direct and 3D visualization of ferroelectric domain structures becomes\r\npossible in potassium titanyl phosphate."}],"status":"public","publisher":"AIP Publishing","date_updated":"2023-10-09T08:32:15Z","date_created":"2018-08-29T08:21:00Z","author":[{"first_name":"Michael","id":"22501","full_name":"Rüsing, Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","id":"13244","full_name":"Eigner, Christof","first_name":"Christof"},{"first_name":"P.","full_name":"Mackwitz, P.","last_name":"Mackwitz"},{"last_name":"Berth","id":"53","full_name":"Berth, Gerhard","first_name":"Gerhard"},{"last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263","first_name":"Christine"},{"first_name":"Artur","id":"606","full_name":"Zrenner, Artur","orcid":"0000-0002-5190-0944","last_name":"Zrenner"}],"volume":119,"title":"Identification of ferroelectric domain structure sensitive phonon modes in potassium titanyl phosphate: A fundamental study","doi":"10.1063/1.4940964","publication_status":"published","publication_identifier":{"issn":["0021-8979","1089-7550"]},"issue":"4","year":"2016","citation":{"apa":"Rüsing, M., Eigner, C., Mackwitz, P., Berth, G., Silberhorn, C., &#38; Zrenner, A. (2016). Identification of ferroelectric domain structure sensitive phonon modes in potassium titanyl phosphate: A fundamental study. <i>Journal of Applied Physics</i>, <i>119</i>(4), Article 044103. <a href=\"https://doi.org/10.1063/1.4940964\">https://doi.org/10.1063/1.4940964</a>","mla":"Rüsing, Michael, et al. “Identification of Ferroelectric Domain Structure Sensitive Phonon Modes in Potassium Titanyl Phosphate: A Fundamental Study.” <i>Journal of Applied Physics</i>, vol. 119, no. 4, 044103, AIP Publishing, 2016, doi:<a href=\"https://doi.org/10.1063/1.4940964\">10.1063/1.4940964</a>.","bibtex":"@article{Rüsing_Eigner_Mackwitz_Berth_Silberhorn_Zrenner_2016, title={Identification of ferroelectric domain structure sensitive phonon modes in potassium titanyl phosphate: A fundamental study}, volume={119}, DOI={<a href=\"https://doi.org/10.1063/1.4940964\">10.1063/1.4940964</a>}, number={4044103}, journal={Journal of Applied Physics}, publisher={AIP Publishing}, author={Rüsing, Michael and Eigner, Christof and Mackwitz, P. and Berth, Gerhard and Silberhorn, Christine and Zrenner, Artur}, year={2016} }","short":"M. Rüsing, C. Eigner, P. Mackwitz, G. Berth, C. Silberhorn, A. Zrenner, Journal of Applied Physics 119 (2016).","ama":"Rüsing M, Eigner C, Mackwitz P, Berth G, Silberhorn C, Zrenner A. Identification of ferroelectric domain structure sensitive phonon modes in potassium titanyl phosphate: A fundamental study. <i>Journal of Applied Physics</i>. 2016;119(4). doi:<a href=\"https://doi.org/10.1063/1.4940964\">10.1063/1.4940964</a>","ieee":"M. Rüsing, C. Eigner, P. Mackwitz, G. Berth, C. Silberhorn, and A. Zrenner, “Identification of ferroelectric domain structure sensitive phonon modes in potassium titanyl phosphate: A fundamental study,” <i>Journal of Applied Physics</i>, vol. 119, no. 4, Art. no. 044103, 2016, doi: <a href=\"https://doi.org/10.1063/1.4940964\">10.1063/1.4940964</a>.","chicago":"Rüsing, Michael, Christof Eigner, P. Mackwitz, Gerhard Berth, Christine Silberhorn, and Artur Zrenner. “Identification of Ferroelectric Domain Structure Sensitive Phonon Modes in Potassium Titanyl Phosphate: A Fundamental Study.” <i>Journal of Applied Physics</i> 119, no. 4 (2016). <a href=\"https://doi.org/10.1063/1.4940964\">https://doi.org/10.1063/1.4940964</a>."},"intvolume":"       119"},{"abstract":[{"text":"We report the fabrication of periodically poled domain patterns in x-cut lithium niobate thin-film.\r\nHere, thin films on insulator have drawn particular attention due to their intrinsic waveguiding\r\nproperties offering high mode confinement and smaller devices compared to in-diffused waveguides\r\nin bulk material. In contrast to z-cut thin film lithium niobate, the x-cut geometry does not\r\nrequire back electrodes for poling. Further, the x-cut geometry grants direct access to the largest\r\nnonlinear and electro-optical tensor element, which overall promises smaller devices. The domain\r\ninversion was realized via electric field poling utilizing deposited aluminum top electrodes on a\r\nstack of LN thin film/SiO2 layer/Bulk LN, which were patterned by optical lithography. The periodic\r\ndomain inversion was verified by non-invasive confocal second harmonic microscopy. Our\r\nresults show domain patterns in accordance to the electrode mask layout. The second harmonic signatures\r\ncan be interpreted in terms of spatially, overlapping domain filaments which start their\r\ngrowth on the þz side.","lang":"eng"}],"status":"public","type":"journal_article","publication":"Applied Physics Letters","article_number":"152902","article_type":"original","language":[{"iso":"eng"}],"project":[{"name":"TRR 142","_id":"53","grant_number":"231447078"},{"_id":"55","name":"TRR 142 - Project Area B"},{"grant_number":"231447078","name":"TRR 142 - Subproject B3","_id":"68"}],"_id":"4237","user_id":"14931","department":[{"_id":"15"},{"_id":"230"},{"_id":"35"}],"year":"2016","citation":{"chicago":"Mackwitz, P., Michael Rüsing, Gerhard Berth, A. Widhalm, K. Müller, and Artur Zrenner. “Periodic Domain Inversion in X-Cut Single-Crystal Lithium Niobate Thin Film.” <i>Applied Physics Letters</i> 108, no. 15 (2016). <a href=\"https://doi.org/10.1063/1.4946010\">https://doi.org/10.1063/1.4946010</a>.","ieee":"P. Mackwitz, M. Rüsing, G. Berth, A. Widhalm, K. Müller, and A. Zrenner, “Periodic domain inversion in x-cut single-crystal lithium niobate thin film,” <i>Applied Physics Letters</i>, vol. 108, no. 15, Art. no. 152902, 2016, doi: <a href=\"https://doi.org/10.1063/1.4946010\">10.1063/1.4946010</a>.","ama":"Mackwitz P, Rüsing M, Berth G, Widhalm A, Müller K, Zrenner A. Periodic domain inversion in x-cut single-crystal lithium niobate thin film. <i>Applied Physics Letters</i>. 2016;108(15). doi:<a href=\"https://doi.org/10.1063/1.4946010\">10.1063/1.4946010</a>","short":"P. Mackwitz, M. Rüsing, G. Berth, A. Widhalm, K. Müller, A. Zrenner, Applied Physics Letters 108 (2016).","mla":"Mackwitz, P., et al. “Periodic Domain Inversion in X-Cut Single-Crystal Lithium Niobate Thin Film.” <i>Applied Physics Letters</i>, vol. 108, no. 15, 152902, AIP Publishing, 2016, doi:<a href=\"https://doi.org/10.1063/1.4946010\">10.1063/1.4946010</a>.","bibtex":"@article{Mackwitz_Rüsing_Berth_Widhalm_Müller_Zrenner_2016, title={Periodic domain inversion in x-cut single-crystal lithium niobate thin film}, volume={108}, DOI={<a href=\"https://doi.org/10.1063/1.4946010\">10.1063/1.4946010</a>}, number={15152902}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Mackwitz, P. and Rüsing, Michael and Berth, Gerhard and Widhalm, A. and Müller, K. and Zrenner, Artur}, year={2016} }","apa":"Mackwitz, P., Rüsing, M., Berth, G., Widhalm, A., Müller, K., &#38; Zrenner, A. (2016). Periodic domain inversion in x-cut single-crystal lithium niobate thin film. <i>Applied Physics Letters</i>, <i>108</i>(15), Article 152902. <a href=\"https://doi.org/10.1063/1.4946010\">https://doi.org/10.1063/1.4946010</a>"},"intvolume":"       108","publication_status":"published","publication_identifier":{"issn":["0003-6951","1077-3118"]},"issue":"15","title":"Periodic domain inversion in x-cut single-crystal lithium niobate thin film","doi":"10.1063/1.4946010","publisher":"AIP Publishing","date_updated":"2023-10-09T08:05:45Z","date_created":"2018-08-29T08:16:14Z","author":[{"last_name":"Mackwitz","full_name":"Mackwitz, P.","first_name":"P."},{"first_name":"Michael","full_name":"Rüsing, Michael","id":"22501","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"first_name":"Gerhard","id":"53","full_name":"Berth, Gerhard","last_name":"Berth"},{"last_name":"Widhalm","full_name":"Widhalm, A.","first_name":"A."},{"last_name":"Müller","full_name":"Müller, K.","first_name":"K."},{"full_name":"Zrenner, Artur","id":"606","orcid":"0000-0002-5190-0944","last_name":"Zrenner","first_name":"Artur"}],"volume":108},{"status":"public","type":"journal_article","article_type":"original","project":[{"name":"TRR 142","_id":"53","grant_number":"231447078"},{"name":"TRR 142 - Project Area B","_id":"55"},{"name":"TRR 142 - Subproject B3","_id":"68","grant_number":"231447078"}],"_id":"4240","user_id":"14931","department":[{"_id":"15"},{"_id":"230"},{"_id":"35"}],"citation":{"apa":"Rüsing, M., Wecker, T., Berth, G., As, D. J., &#38; Zrenner, A. (2016). Joint Raman spectroscopy and HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC. <i>Physica Status Solidi (b)</i>, <i>253</i>(4), 778–782. <a href=\"https://doi.org/10.1002/pssb.201552592\">https://doi.org/10.1002/pssb.201552592</a>","short":"M. Rüsing, T. Wecker, G. Berth, D.J. As, A. Zrenner, Physica Status Solidi (b) 253 (2016) 778–782.","bibtex":"@article{Rüsing_Wecker_Berth_As_Zrenner_2016, title={Joint Raman spectroscopy and HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC}, volume={253}, DOI={<a href=\"https://doi.org/10.1002/pssb.201552592\">10.1002/pssb.201552592</a>}, number={4}, journal={physica status solidi (b)}, publisher={Wiley}, author={Rüsing, Michael and Wecker, T. and Berth, Gerhard and As, Donat Josef and Zrenner, Artur}, year={2016}, pages={778–782} }","mla":"Rüsing, Michael, et al. “Joint Raman Spectroscopy and HRXRD Investigation of Cubic Gallium Nitride Layers Grown on 3C-SiC.” <i>Physica Status Solidi (b)</i>, vol. 253, no. 4, Wiley, 2016, pp. 778–82, doi:<a href=\"https://doi.org/10.1002/pssb.201552592\">10.1002/pssb.201552592</a>.","ama":"Rüsing M, Wecker T, Berth G, As DJ, Zrenner A. Joint Raman spectroscopy and HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC. <i>physica status solidi (b)</i>. 2016;253(4):778-782. doi:<a href=\"https://doi.org/10.1002/pssb.201552592\">10.1002/pssb.201552592</a>","chicago":"Rüsing, Michael, T. Wecker, Gerhard Berth, Donat Josef As, and Artur Zrenner. “Joint Raman Spectroscopy and HRXRD Investigation of Cubic Gallium Nitride Layers Grown on 3C-SiC.” <i>Physica Status Solidi (b)</i> 253, no. 4 (2016): 778–82. <a href=\"https://doi.org/10.1002/pssb.201552592\">https://doi.org/10.1002/pssb.201552592</a>.","ieee":"M. Rüsing, T. Wecker, G. Berth, D. J. As, and A. Zrenner, “Joint Raman spectroscopy and HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC,” <i>physica status solidi (b)</i>, vol. 253, no. 4, pp. 778–782, 2016, doi: <a href=\"https://doi.org/10.1002/pssb.201552592\">10.1002/pssb.201552592</a>."},"page":"778-782","intvolume":"       253","publication_status":"published","publication_identifier":{"issn":["0370-1972"]},"doi":"10.1002/pssb.201552592","date_updated":"2023-10-09T08:48:35Z","author":[{"orcid":"0000-0003-4682-4577","last_name":"Rüsing","id":"22501","full_name":"Rüsing, Michael","first_name":"Michael"},{"first_name":"T.","last_name":"Wecker","full_name":"Wecker, T."},{"last_name":"Berth","full_name":"Berth, Gerhard","id":"53","first_name":"Gerhard"},{"last_name":"As","orcid":"0000-0003-1121-3565","id":"14","full_name":"As, Donat Josef","first_name":"Donat Josef"},{"first_name":"Artur","id":"606","full_name":"Zrenner, Artur","orcid":"0000-0002-5190-0944","last_name":"Zrenner"}],"volume":253,"abstract":[{"lang":"eng","text":"Cubic gallium nitride (GaN) films are analyzed with highresolution X-ray diffraction (HRXRD) and Raman spectroscopy. Several cubic GaN layers were grown on 3C-SiC (001) substrate by radio-frequency plasma-assisted molecular beam epitaxy. The layer thickness of the cubic GaN was varied between 75 and 505 nm. The HRXRD analysis reveals a reduction of the full-width at half-maximum (FWHM) of omega scans for growing layer thicknesses, which is caused by a partial compensation of defects. The Raman characterization confirms well-formed c-GaN layers. A more detailed examination of the longitudinal optical mode hints at a correlation of the FWHM of the Raman mode with the dislocation density, which shows the possibility to determine dislocation densities by Ramanspectroscopy on a micrometer scale, which is not possible by HRXRD. Furthermore, this Raman analysis shows that normalized Raman spectra present an alternative way to determine layer thicknesses of thin GaN films."}],"publication":"physica status solidi (b)","keyword":["cubic gallium nitride","dislocation density","HRXRD","Raman spectroscopy"],"language":[{"iso":"eng"}],"year":"2016","issue":"4","title":"Joint Raman spectroscopy and HRXRD investigation of cubic gallium nitride layers grown on 3C-SiC","publisher":"Wiley","date_created":"2018-08-29T08:24:01Z"},{"date_updated":"2023-10-11T07:28:32Z","author":[{"first_name":"Michael","orcid":"0000-0003-4682-4577","last_name":"Rüsing","full_name":"Rüsing, Michael","id":"22501"},{"first_name":"Simone","last_name":"Sanna","full_name":"Sanna, Simone"},{"first_name":"Sergej","last_name":"Neufeld","full_name":"Neufeld, Sergej","id":"23261"},{"first_name":"Gerhard","last_name":"Berth","full_name":"Berth, Gerhard","id":"53"},{"id":"468","full_name":"Schmidt, Wolf Gero","orcid":"0000-0002-2717-5076","last_name":"Schmidt","first_name":"Wolf Gero"},{"id":"606","full_name":"Zrenner, Artur","last_name":"Zrenner","orcid":"0000-0002-5190-0944","first_name":"Artur"},{"last_name":"Yu","full_name":"Yu, H.","first_name":"H."},{"full_name":"Wang, Y.","last_name":"Wang","first_name":"Y."},{"last_name":"Zhang","full_name":"Zhang, H.","first_name":"H."}],"date_created":"2019-05-29T07:55:07Z","title":"Vibrational properties of LiNb1−xTaxO3 mixed crystals","doi":"10.1103/physrevb.93.184305","publication_identifier":{"issn":["2469-9950","2469-9969"]},"publication_status":"published","year":"2016","citation":{"chicago":"Rüsing, Michael, Simone Sanna, Sergej Neufeld, Gerhard Berth, Wolf Gero Schmidt, Artur Zrenner, H. Yu, Y. Wang, and H. Zhang. “Vibrational Properties of LiNb1−xTaxO3 Mixed Crystals.” <i>Physical Review B</i>, 2016. <a href=\"https://doi.org/10.1103/physrevb.93.184305\">https://doi.org/10.1103/physrevb.93.184305</a>.","ieee":"M. Rüsing <i>et al.</i>, “Vibrational properties of LiNb1−xTaxO3 mixed crystals,” <i>Physical Review B</i>, 2016, doi: <a href=\"https://doi.org/10.1103/physrevb.93.184305\">10.1103/physrevb.93.184305</a>.","ama":"Rüsing M, Sanna S, Neufeld S, et al. Vibrational properties of LiNb1−xTaxO3 mixed crystals. <i>Physical Review B</i>. Published online 2016. doi:<a href=\"https://doi.org/10.1103/physrevb.93.184305\">10.1103/physrevb.93.184305</a>","apa":"Rüsing, M., Sanna, S., Neufeld, S., Berth, G., Schmidt, W. G., Zrenner, A., Yu, H., Wang, Y., &#38; Zhang, H. (2016). Vibrational properties of LiNb1−xTaxO3 mixed crystals. <i>Physical Review B</i>. <a href=\"https://doi.org/10.1103/physrevb.93.184305\">https://doi.org/10.1103/physrevb.93.184305</a>","mla":"Rüsing, Michael, et al. “Vibrational Properties of LiNb1−xTaxO3 Mixed Crystals.” <i>Physical Review B</i>, 2016, doi:<a href=\"https://doi.org/10.1103/physrevb.93.184305\">10.1103/physrevb.93.184305</a>.","short":"M. Rüsing, S. Sanna, S. Neufeld, G. Berth, W.G. Schmidt, A. Zrenner, H. Yu, Y. Wang, H. Zhang, Physical Review B (2016).","bibtex":"@article{Rüsing_Sanna_Neufeld_Berth_Schmidt_Zrenner_Yu_Wang_Zhang_2016, title={Vibrational properties of LiNb1−xTaxO3 mixed crystals}, DOI={<a href=\"https://doi.org/10.1103/physrevb.93.184305\">10.1103/physrevb.93.184305</a>}, journal={Physical Review B}, author={Rüsing, Michael and Sanna, Simone and Neufeld, Sergej and Berth, Gerhard and Schmidt, Wolf Gero and Zrenner, Artur and Yu, H. and Wang, Y. and Zhang, H.}, year={2016} }"},"_id":"10026","project":[{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"},{"grant_number":"231447078","name":"TRR 142","_id":"53"},{"name":"TRR 142 - Project Area B","_id":"55"},{"_id":"69","name":"TRR 142 - Subproject B4","grant_number":"231447078"},{"name":"TRR 142 - Subproject B3","_id":"68","grant_number":"231447078"}],"department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"230"}],"user_id":"22501","funded_apc":"1","language":[{"iso":"eng"}],"publication":"Physical Review B","type":"journal_article","abstract":[{"lang":"eng","text":"Congruent lithium niobate and lithium tantalate mixed crystals have been grown over the complete\r\ncompositional range with the Czochralski method. The structural and vibrational properties of the mixed\r\ncrystals are studied extensively by x-ray diffraction measurements, Raman spectroscopy, and density functional\r\ntheory. The measured lattice parameters and vibrational frequencies are in good agreement with our theoretical\r\npredictions. The observed dependence of the Raman frequencies on the crystal composition is discussed on the\r\nbasis of the calculated phonon displacement patterns. The phononic contribution to the static dielectric tensor\r\nis calculated by means of the generalized Lyddane-Sachs-Teller relation. Due to the pronounced dependence of\r\nthe optical response on the Ta concentration, lithium niobate tantalate mixed crystals represent a perfect model\r\nsystem to study the properties of uniaxial mixed ferroelectric materials for application in integrated optics."}],"status":"public"},{"department":[{"_id":"15"},{"_id":"230"}],"user_id":"22501","_id":"4332","project":[{"_id":"53","name":"TRR 142","grant_number":"231447078"},{"_id":"55","name":"TRR 142 - Project Area B"},{"grant_number":"231447078","_id":"68","name":"TRR 142 - Subproject B3"},{"_id":"69","name":"TRR 142 - Subproject B4","grant_number":"231447078"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"funded_apc":"1","article_type":"original","type":"journal_article","status":"public","volume":91,"author":[{"first_name":"Simone","full_name":"Sanna, Simone","last_name":"Sanna"},{"id":"23261","full_name":"Neufeld, Sergej","last_name":"Neufeld","first_name":"Sergej"},{"first_name":"Michael","full_name":"Rüsing, Michael","id":"22501","last_name":"Rüsing","orcid":"0000-0003-4682-4577"},{"first_name":"Gerhard","last_name":"Berth","full_name":"Berth, Gerhard","id":"53"},{"first_name":"Artur","id":"606","full_name":"Zrenner, Artur","last_name":"Zrenner","orcid":"0000-0002-5190-0944"},{"orcid":"0000-0002-2717-5076","last_name":"Schmidt","id":"468","full_name":"Schmidt, Wolf Gero","first_name":"Wolf Gero"}],"date_updated":"2023-10-11T07:25:58Z","doi":"10.1103/physrevb.91.224302","publication_identifier":{"issn":["1098-0121","1550-235X"]},"publication_status":"published","intvolume":"        91","citation":{"apa":"Sanna, S., Neufeld, S., Rüsing, M., Berth, G., Zrenner, A., &#38; Schmidt, W. G. (2015). Raman scattering efficiency in LiTaO3 and LiNbO3 crystals. <i>Physical Review B</i>, <i>91</i>(22). <a href=\"https://doi.org/10.1103/physrevb.91.224302\">https://doi.org/10.1103/physrevb.91.224302</a>","mla":"Sanna, Simone, et al. “Raman Scattering Efficiency in LiTaO3 and LiNbO3 Crystals.” <i>Physical Review B</i>, vol. 91, no. 22, American Physical Society (APS), 2015, doi:<a href=\"https://doi.org/10.1103/physrevb.91.224302\">10.1103/physrevb.91.224302</a>.","bibtex":"@article{Sanna_Neufeld_Rüsing_Berth_Zrenner_Schmidt_2015, title={Raman scattering efficiency in LiTaO3 and LiNbO3 crystals}, volume={91}, DOI={<a href=\"https://doi.org/10.1103/physrevb.91.224302\">10.1103/physrevb.91.224302</a>}, number={22}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Sanna, Simone and Neufeld, Sergej and Rüsing, Michael and Berth, Gerhard and Zrenner, Artur and Schmidt, Wolf Gero}, year={2015} }","short":"S. Sanna, S. Neufeld, M. Rüsing, G. Berth, A. Zrenner, W.G. Schmidt, Physical Review B 91 (2015).","ama":"Sanna S, Neufeld S, Rüsing M, Berth G, Zrenner A, Schmidt WG. Raman scattering efficiency in LiTaO3 and LiNbO3 crystals. <i>Physical Review B</i>. 2015;91(22). doi:<a href=\"https://doi.org/10.1103/physrevb.91.224302\">10.1103/physrevb.91.224302</a>","ieee":"S. Sanna, S. Neufeld, M. Rüsing, G. Berth, A. Zrenner, and W. G. Schmidt, “Raman scattering efficiency in LiTaO3 and LiNbO3 crystals,” <i>Physical Review B</i>, vol. 91, no. 22, 2015, doi: <a href=\"https://doi.org/10.1103/physrevb.91.224302\">10.1103/physrevb.91.224302</a>.","chicago":"Sanna, Simone, Sergej Neufeld, Michael Rüsing, Gerhard Berth, Artur Zrenner, and Wolf Gero Schmidt. “Raman Scattering Efficiency in LiTaO3 and LiNbO3 Crystals.” <i>Physical Review B</i> 91, no. 22 (2015). <a href=\"https://doi.org/10.1103/physrevb.91.224302\">https://doi.org/10.1103/physrevb.91.224302</a>."},"language":[{"iso":"eng"}],"publication":"Physical Review B","abstract":[{"text":"LiTaO3 and LiNbO3 crystals are investigated here in a combined experimental and theoretical study that uses Raman spectroscopy in a complete set of scattering geometries and corresponding density-functional theory calculations to provide microscopic information on their vibrational properties. The Raman scattering efficiency is computed from first principles in order to univocally assign the measured Raman peaks to the calculated eigenvectors. Measured and calculated Raman spectra are shown to be in qualitative agreement and confirm the mode assignment by Margueron et al. [J. Appl. Phys. 111, 104105 (2012)], thus finally settling a long debate. While the two crystals show rather similar vibrational properties overall, the E-TO9 mode is markedly different in the two oxides. The deviations are explained by a different anion-cation bond type in LiTaO3 and LiNbO3 crystals.","lang":"eng"}],"date_created":"2018-08-30T13:51:38Z","publisher":"American Physical Society (APS)","title":"Raman scattering efficiency in LiTaO3 and LiNbO3 crystals","issue":"22","year":"2015"},{"year":"2013","citation":{"chicago":"Sanna, Simone, A. Riefer, Sergej Neufeld, Wolf Gero Schmidt, Gerhard Berth, Michael Rüsing, A. Widhalm, and Artur Zrenner. “Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals.” <i>Ferroelectrics</i> 447, no. 1 (2013): 63–68. <a href=\"https://doi.org/10.1080/00150193.2013.821893\">https://doi.org/10.1080/00150193.2013.821893</a>.","ieee":"S. Sanna <i>et al.</i>, “Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals,” <i>Ferroelectrics</i>, vol. 447, no. 1, pp. 63–68, 2013, doi: <a href=\"https://doi.org/10.1080/00150193.2013.821893\">10.1080/00150193.2013.821893</a>.","ama":"Sanna S, Riefer A, Neufeld S, et al. Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals. <i>Ferroelectrics</i>. 2013;447(1):63-68. doi:<a href=\"https://doi.org/10.1080/00150193.2013.821893\">10.1080/00150193.2013.821893</a>","apa":"Sanna, S., Riefer, A., Neufeld, S., Schmidt, W. G., Berth, G., Rüsing, M., Widhalm, A., &#38; Zrenner, A. (2013). Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals. <i>Ferroelectrics</i>, <i>447</i>(1), 63–68. <a href=\"https://doi.org/10.1080/00150193.2013.821893\">https://doi.org/10.1080/00150193.2013.821893</a>","short":"S. Sanna, A. Riefer, S. Neufeld, W.G. Schmidt, G. Berth, M. Rüsing, A. Widhalm, A. Zrenner, Ferroelectrics 447 (2013) 63–68.","bibtex":"@article{Sanna_Riefer_Neufeld_Schmidt_Berth_Rüsing_Widhalm_Zrenner_2013, title={Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals}, volume={447}, DOI={<a href=\"https://doi.org/10.1080/00150193.2013.821893\">10.1080/00150193.2013.821893</a>}, number={1}, journal={Ferroelectrics}, author={Sanna, Simone and Riefer, A. and Neufeld, Sergej and Schmidt, Wolf Gero and Berth, Gerhard and Rüsing, Michael and Widhalm, A. and Zrenner, Artur}, year={2013}, pages={63–68} }","mla":"Sanna, Simone, et al. “Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals.” <i>Ferroelectrics</i>, vol. 447, no. 1, 2013, pp. 63–68, doi:<a href=\"https://doi.org/10.1080/00150193.2013.821893\">10.1080/00150193.2013.821893</a>."},"page":"63-68","intvolume":"       447","publication_status":"published","publication_identifier":{"issn":["0015-0193","1563-5112"]},"issue":"1","title":"Vibrational Fingerprints of LiNbO3-LiTaO3Mixed Crystals","doi":"10.1080/00150193.2013.821893","date_updated":"2023-10-09T08:22:10Z","date_created":"2019-09-30T13:50:40Z","author":[{"last_name":"Sanna","full_name":"Sanna, Simone","first_name":"Simone"},{"first_name":"A.","last_name":"Riefer","full_name":"Riefer, A."},{"first_name":"Sergej","last_name":"Neufeld","id":"23261","full_name":"Neufeld, Sergej"},{"id":"468","full_name":"Schmidt, Wolf Gero","last_name":"Schmidt","orcid":"0000-0002-2717-5076","first_name":"Wolf Gero"},{"full_name":"Berth, Gerhard","id":"53","last_name":"Berth","first_name":"Gerhard"},{"first_name":"Michael","full_name":"Rüsing, Michael","id":"22501","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"first_name":"A.","last_name":"Widhalm","full_name":"Widhalm, A."},{"id":"606","full_name":"Zrenner, Artur","orcid":"0000-0002-5190-0944","last_name":"Zrenner","first_name":"Artur"}],"volume":447,"abstract":[{"lang":"eng","text":"Atomistic simulations in the framework of the density functional theory have been used to model morphologic and vibrational properties of lithium niobate–lithium tantalate mixed crystals as a function of the [Nb]/[Ta] ratio. Structural parameters such as the crystal volume and the lattice parameters a and c vary roughly linearly from LiTaO3 to LiNbO3, showing only minor deviations from the Vegard behavior. Our ab initio calculations demonstrate that the TO1, TO2 and TO4 vibrational modes become harder with increasing Nb concentration. TO3 becomes softer with increasing Nb content, instead. Furthermore, the investigated zone center A1 -TO phonon modes are characterized by a pronounced stoichiometry dependence. Frequency shifts as large as 30 cm−1 are expected as the [Nb]/[Ta] ratio grows from 0 to 1. Therefore, spectroscopic techniques sensitive to the A1 modes (such as Raman spectroscopy), can be employed for a direct and non-destructive determination of the crystal composition."}],"status":"public","type":"journal_article","publication":"Ferroelectrics","keyword":["Ferroelectrics","vibrational properties","LiNbO3","LiTaO3","mixed crystals"],"language":[{"iso":"eng"}],"project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"_id":"13520","user_id":"14931","department":[{"_id":"15"},{"_id":"170"},{"_id":"295"},{"_id":"230"}]},{"abstract":[{"lang":"eng","text":"Copper oxide and cobalt oxide (CuO, Co3O4) nanocrystals (NCs) have been successfully prepared in a short time using microwave irradiation without any postannealing treatment. Both kinds of nanocrystals (NCs) have been prepared using copper nitrate and cobalt nitrate as the starting materials and distilled water as the solvent. The resulted powders of nanocrystals (NCs) were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and atomic force microscopy (AFM) measurements. The obtained results confirm the presence of the both of oxides nanopowders produced during chemical precipitation using microwave irradiation. A strong emission under UV excitation is obtained from the prepared CuO and Co3O4 nanoparticles. The results show that the nanoparticles have high dispersion and narrow size distribution. The line scans of atomic force microscopy (AFM) images of the nanocrystals (NCs) sprayed on GaAs substrates confirm the results of both X-ray diffraction and transmission electron microscopy. Furthermore, vibrational studies have been carried out using Raman spectroscopic technique. Specific Raman peaks have been observed in the CuO and Co3O4 nanostructures, and the full width at half maximum (FWHM) of the peaks indicates a small particle size of the nanocrystals."}],"publication":"Journal of Nanomaterials","keyword":["General Materials Science"],"language":[{"iso":"eng"}],"year":"2013","quality_controlled":"1","title":"CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy","publisher":"Hindawi Limited","date_created":"2023-10-11T07:09:27Z","status":"public","type":"journal_article","article_type":"original","_id":"47940","user_id":"22501","department":[{"_id":"15"}],"citation":{"apa":"Rashad, M., Rüsing, M., Berth, G., Lischka, K., &#38; Pawlis, A. (2013). CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy. <i>Journal of Nanomaterials</i>, <i>2013</i>, 714853. <a href=\"https://doi.org/10.1155/2013/714853\">https://doi.org/10.1155/2013/714853</a>","bibtex":"@article{Rashad_Rüsing_Berth_Lischka_Pawlis_2013, title={CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy}, volume={2013}, DOI={<a href=\"https://doi.org/10.1155/2013/714853\">10.1155/2013/714853</a>}, journal={Journal of Nanomaterials}, publisher={Hindawi Limited}, author={Rashad, M. and Rüsing, Michael and Berth, Gerhard and Lischka, K. and Pawlis, A.}, year={2013}, pages={714853} }","short":"M. Rashad, M. Rüsing, G. Berth, K. Lischka, A. Pawlis, Journal of Nanomaterials 2013 (2013) 714853.","mla":"Rashad, M., et al. “CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy.” <i>Journal of Nanomaterials</i>, vol. 2013, Hindawi Limited, 2013, p. 714853, doi:<a href=\"https://doi.org/10.1155/2013/714853\">10.1155/2013/714853</a>.","ieee":"M. Rashad, M. Rüsing, G. Berth, K. Lischka, and A. Pawlis, “CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy,” <i>Journal of Nanomaterials</i>, vol. 2013, p. 714853, 2013, doi: <a href=\"https://doi.org/10.1155/2013/714853\">10.1155/2013/714853</a>.","chicago":"Rashad, M., Michael Rüsing, Gerhard Berth, K. Lischka, and A. Pawlis. “CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy.” <i>Journal of Nanomaterials</i> 2013 (2013): 714853. <a href=\"https://doi.org/10.1155/2013/714853\">https://doi.org/10.1155/2013/714853</a>.","ama":"Rashad M, Rüsing M, Berth G, Lischka K, Pawlis A. CuO and Co3O4 Nanoparticles: Synthesis, Characterizations, and Raman Spectroscopy. <i>Journal of Nanomaterials</i>. 2013;2013:714853. doi:<a href=\"https://doi.org/10.1155/2013/714853\">10.1155/2013/714853</a>"},"intvolume":"      2013","page":"714853","publication_status":"published","publication_identifier":{"eissn":["1687-4129"],"issn":["1687-4110"]},"main_file_link":[{"url":"https://dl.acm.org/doi/pdf/10.1155/2013/714853","open_access":"1"}],"doi":"10.1155/2013/714853","date_updated":"2023-10-11T07:24:25Z","oa":"1","author":[{"first_name":"M.","last_name":"Rashad","full_name":"Rashad, M."},{"first_name":"Michael","full_name":"Rüsing, Michael","id":"22501","orcid":"0000-0003-4682-4577","last_name":"Rüsing"},{"first_name":"Gerhard","last_name":"Berth","id":"53","full_name":"Berth, Gerhard"},{"full_name":"Lischka, K.","last_name":"Lischka","first_name":"K."},{"full_name":"Pawlis, A.","last_name":"Pawlis","first_name":"A."}],"volume":2013}]