--- _id: '52738' abstract: - lang: eng text: Through tailoring the geometry and design of biomaterials, additive manufacturing is revolutionizing the production of metallic patient-specific implants, e.g., the Ti-6Al-7Nb alloy. Unfortunately, studies investigating this alloy showed that additively produced samples exhibit anisotropic microstructures. This anisotropy compromises the mechanical properties and complicates the loading state in the implant. Moreover, the minimum requirements as specified per designated standards such as ISO 5832-11 are not met. The remedy to this problem is performing a conventional heat treatment. As this route requires energy, infrastructure, labor, and expertise, which in turn mean time and money, many of the additive manufacturing benefits are negated. Thus, the goal of this work was to achieve better isotropy by applying only adapted additive manufacturing process parameters, specifically focusing on the build orientations. In this work, samples orientated in 90°, 45°, and 0° directions relative to the building platform were manufactured and tested. These tests included mechanical (tensile and fatigue tests) as well as microstructural analyses (SEM and EBSD). Subsequently, the results of these tests such as fractography were correlated with the acquired mechanical properties. These showed that 90°-aligned samples performed best under fatigue load and that all requirements specified by the standard regarding monotonic load were met. article_number: '117' author: - first_name: Dennis full_name: Milaege, Dennis id: '35461' last_name: Milaege - first_name: Niklas full_name: Eschemann, Niklas last_name: Eschemann - first_name: Kay-Peter full_name: Hoyer, Kay-Peter id: '48411' last_name: Hoyer - first_name: Mirko full_name: Schaper, Mirko id: '43720' last_name: Schaper citation: ama: Milaege D, Eschemann N, Hoyer K-P, Schaper M. Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion. Crystals. 2024;14(2). doi:10.3390/cryst14020117 apa: Milaege, D., Eschemann, N., Hoyer, K.-P., & Schaper, M. (2024). Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion. Crystals, 14(2), Article 117. https://doi.org/10.3390/cryst14020117 bibtex: '@article{Milaege_Eschemann_Hoyer_Schaper_2024, title={Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion}, volume={14}, DOI={10.3390/cryst14020117}, number={2117}, journal={Crystals}, publisher={MDPI AG}, author={Milaege, Dennis and Eschemann, Niklas and Hoyer, Kay-Peter and Schaper, Mirko}, year={2024} }' chicago: Milaege, Dennis, Niklas Eschemann, Kay-Peter Hoyer, and Mirko Schaper. “Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion.” Crystals 14, no. 2 (2024). https://doi.org/10.3390/cryst14020117. ieee: 'D. Milaege, N. Eschemann, K.-P. Hoyer, and M. Schaper, “Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion,” Crystals, vol. 14, no. 2, Art. no. 117, 2024, doi: 10.3390/cryst14020117.' mla: Milaege, Dennis, et al. “Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion.” Crystals, vol. 14, no. 2, 117, MDPI AG, 2024, doi:10.3390/cryst14020117. short: D. Milaege, N. Eschemann, K.-P. Hoyer, M. Schaper, Crystals 14 (2024). date_created: 2024-03-22T13:46:37Z date_updated: 2024-03-22T14:22:36Z department: - _id: '158' - _id: '321' doi: 10.3390/cryst14020117 intvolume: ' 14' issue: '2' keyword: - Inorganic Chemistry - Condensed Matter Physics - General Materials Science - General Chemical Engineering language: - iso: eng publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published publisher: MDPI AG quality_controlled: '1' status: public title: Anisotropic Mechanical and Microstructural Properties of a Ti-6Al-7Nb Alloy for Biomedical Applications Manufactured via Laser Powder Bed Fusion type: journal_article user_id: '35461' volume: 14 year: '2024' ... --- _id: '37200' abstract: - lang: eng text: (1) This work answers the question of whether and to what extent there is a significant difference in mechanical properties when different additive manufacturing processes are applied to the material 1.2709. The Laser-Powder-Bed-Fusion (L-PBF) and Laser-Metal-Deposition (LMD) processes are considered, as they differ fundamentally in the way a part is manufactured. (2) Known process parameters for low-porosity parts were used to fabricate tensile strength specimens. Half of the specimens were heat-treated, and all specimens were tested for mechanical properties in a quasi-static tensile test. In addition, the material hardness was determined. (3) It was found that, firstly, heat treatment resulted in a sharp increase in mechanical properties such as hardness, elastic modulus, yield strength and ultimate strength. In addition to the increase in these properties, the elongation at break also decreases significantly after heat treatment. The choice of process, on the other hand, does not give either process a clear advantage in terms of mechanical properties but shows that it is necessary to consider the essential mechanical properties for a desired application. article_number: '157' article_type: original author: - first_name: Stefan full_name: Gnaase, Stefan id: '25730' last_name: Gnaase - first_name: Dennis full_name: Niggemeyer, Dennis id: '77214' last_name: Niggemeyer - first_name: Dennis full_name: Lehnert, Dennis id: '90491' last_name: Lehnert - first_name: Christian full_name: Bödger, Christian id: '93904' last_name: Bödger - first_name: Thomas full_name: Tröster, Thomas id: '553' last_name: Tröster citation: ama: Gnaase S, Niggemeyer D, Lehnert D, Bödger C, Tröster T. Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD & L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709. Crystals. 2023;13(2). doi:10.3390/cryst13020157 apa: Gnaase, S., Niggemeyer, D., Lehnert, D., Bödger, C., & Tröster, T. (2023). Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD & L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709. Crystals, 13(2), Article 157. https://doi.org/10.3390/cryst13020157 bibtex: '@article{Gnaase_Niggemeyer_Lehnert_Bödger_Tröster_2023, title={Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD & L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709}, volume={13}, DOI={10.3390/cryst13020157}, number={2157}, journal={Crystals}, publisher={MDPI AG}, author={Gnaase, Stefan and Niggemeyer, Dennis and Lehnert, Dennis and Bödger, Christian and Tröster, Thomas}, year={2023} }' chicago: Gnaase, Stefan, Dennis Niggemeyer, Dennis Lehnert, Christian Bödger, and Thomas Tröster. “Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD & L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709.” Crystals 13, no. 2 (2023). https://doi.org/10.3390/cryst13020157. ieee: 'S. Gnaase, D. Niggemeyer, D. Lehnert, C. Bödger, and T. Tröster, “Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD & L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709,” Crystals, vol. 13, no. 2, Art. no. 157, 2023, doi: 10.3390/cryst13020157.' mla: Gnaase, Stefan, et al. “Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD & L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709.” Crystals, vol. 13, no. 2, 157, MDPI AG, 2023, doi:10.3390/cryst13020157. short: S. Gnaase, D. Niggemeyer, D. Lehnert, C. Bödger, T. Tröster, Crystals 13 (2023). date_created: 2023-01-18T05:44:59Z date_updated: 2023-05-26T07:14:11Z department: - _id: '149' - _id: '9' - _id: '321' doi: 10.3390/cryst13020157 intvolume: ' 13' issue: '2' keyword: - Inorganic Chemistry - Condensed Matter Physics - General Materials Science - General Chemical Engineering language: - iso: eng publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published publisher: MDPI AG quality_controlled: '1' status: public title: Comparative Study of the Influence of Heat Treatment and Additive Manufacturing Process (LMD & L-PBF) on the Mechanical Properties of Specimens Manufactured from 1.2709 type: journal_article user_id: '90491' volume: 13 year: '2023' ... --- _id: '47997' abstract: - lang: eng text: The crystal family of potassium titanyl phosphate (KTiOPO4) is a promising material group for applications in quantum and nonlinear optics. The fabrication of low-loss optical waveguides, as well as high-grade periodically poled ferroelectric domain structures, requires a profound understanding of the material properties and crystal structure. In this regard, Raman spectroscopy offers the possibility to study and visualize domain structures, strain, defects, and the local stoichiometry, which are all factors impacting device performance. However, the accurate interpretation of Raman spectra and their changes with respect to extrinsic and intrinsic defects requires a thorough assignment of the Raman modes to their respective crystal features, which to date is only partly conducted based on phenomenological modelling. To address this issue, we calculated the phonon spectra of potassium titanyl phosphate and the related compounds rubidium titanyl phosphate (RbTiOPO4) and potassium titanyl arsenate (KTiOAsO4) based on density functional theory and compared them with experimental data. Overall, this allows us to assign various spectral features to eigenmodes of lattice substructures with improved detail compared to previous assignments. Nevertheless, the analysis also shows that not all features of the spectra can unambigiously be explained yet. A possible explanation might be that defects or long range fields not included in the modeling play a crucial rule for the resulting Raman spectrum. In conclusion, this work provides an improved foundation into the vibrational properties in the KTiOPO4 material family. article_number: '1423' author: - first_name: Sergej full_name: Neufeld, Sergej last_name: Neufeld - first_name: Uwe full_name: Gerstmann, Uwe id: '171' last_name: Gerstmann orcid: 0000-0002-4476-223X - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Gerhard full_name: Berth, Gerhard id: '53' last_name: Berth - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Lukas M. full_name: Eng, Lukas M. last_name: Eng - first_name: Wolf Gero full_name: Schmidt, Wolf Gero id: '468' last_name: Schmidt orcid: 0000-0002-2717-5076 - first_name: Michael full_name: Rüsing, Michael id: '22501' last_name: Rüsing orcid: 0000-0003-4682-4577 citation: ama: Neufeld S, Gerstmann U, Padberg L, et al. Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. Crystals. 2023;13(10). doi:10.3390/cryst13101423 apa: Neufeld, S., Gerstmann, U., Padberg, L., Eigner, C., Berth, G., Silberhorn, C., Eng, L. M., Schmidt, W. G., & Rüsing, M. (2023). Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family. Crystals, 13(10), Article 1423. https://doi.org/10.3390/cryst13101423 bibtex: '@article{Neufeld_Gerstmann_Padberg_Eigner_Berth_Silberhorn_Eng_Schmidt_Rüsing_2023, title={Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family}, volume={13}, DOI={10.3390/cryst13101423}, number={101423}, journal={Crystals}, publisher={MDPI AG}, author={Neufeld, Sergej and Gerstmann, Uwe and Padberg, Laura and Eigner, Christof and Berth, Gerhard and Silberhorn, Christine and Eng, Lukas M. and Schmidt, Wolf Gero and Rüsing, Michael}, year={2023} }' chicago: Neufeld, Sergej, Uwe Gerstmann, Laura Padberg, Christof Eigner, Gerhard Berth, Christine Silberhorn, Lukas M. Eng, Wolf Gero Schmidt, and Michael Rüsing. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals 13, no. 10 (2023). https://doi.org/10.3390/cryst13101423. ieee: 'S. Neufeld et al., “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family,” Crystals, vol. 13, no. 10, Art. no. 1423, 2023, doi: 10.3390/cryst13101423.' mla: Neufeld, Sergej, et al. “Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family.” Crystals, vol. 13, no. 10, 1423, MDPI AG, 2023, doi:10.3390/cryst13101423. short: S. Neufeld, U. Gerstmann, L. Padberg, C. Eigner, G. Berth, C. Silberhorn, L.M. Eng, W.G. Schmidt, M. Rüsing, Crystals 13 (2023). date_created: 2023-10-11T09:10:53Z date_updated: 2023-10-11T09:15:58Z department: - _id: '169' doi: 10.3390/cryst13101423 funded_apc: '1' intvolume: ' 13' issue: '10' keyword: - Inorganic Chemistry - Condensed Matter Physics - General Materials Science - General Chemical Engineering language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.3390/cryst13101423 oa: '1' project: - _id: '168' grant_number: '231447078' name: 'TRR 142 - B07: TRR 142 - Polaronen-Einfluss auf die optischen Eigenschaften von Lithiumniobat (B07*)' - _id: '55' name: 'TRR 142 - B: TRR 142 - Project Area B' - _id: '266' grant_number: PROFILNRW-2020-067 name: 'PhoQC: PhoQC: Photonisches Quantencomputing' publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published publisher: MDPI AG quality_controlled: '1' status: public title: Vibrational Properties of the Potassium Titanyl Phosphate Crystal Family type: journal_article user_id: '22501' volume: 13 year: '2023' ... --- _id: '49107' abstract: - lang: eng text: The effect of plaque deposition (atherosclerosis) on blood flow behaviour is investigated via computational fluid dynamics and structural mechanics simulations. To mitigate the narrowing of coronary artery atherosclerosis (stenosis), the computational modelling of auxetic and non-auxetic stents was performed in this study to minimise or even avoid these deposition agents in the future. Computational modelling was performed in unrestricted (open) conditions and restricted (in an artery) conditions. Finally, stent designs were produced by additive manufacturing, and mechanical testing of the stents was undertaken. Auxetic stent 1 and auxetic stent 2 exhibit very little foreshortening and radial recoil in unrestricted deployment conditions compared to non-auxetic stent 3. However, stent 2 shows structural instability (strut failure) during unrestricted deployment conditions. For the restricted deployment condition, stent 1 shows a higher radial recoil compared to stent 3. In the tensile test simulations, short elongation for stent 1 due to strut failure is demonstrated, whereas no structural instability is noticed for stent 2 and stent 3 until 0.5 (mm/mm) strain. The as-built samples show a significant thickening of the struts of the stents resulting in short elongations during tensile testing compared to the simulations (stent 2 and stent 3). A modelling framework for the stent deployment system that enables the selection of appropriate stent designs before in vivo testing is required. This leads to the acceleration of the development process and a reduction in time, resulting in less material wastage. The modelling framework shall be useful for doctors designing patient-specific stents. article_number: '1592' author: - first_name: Sudipta full_name: Pramanik, Sudipta last_name: Pramanik - first_name: Dennis full_name: Milaege, Dennis last_name: Milaege - first_name: Maxwell full_name: Hein, Maxwell id: '52771' last_name: Hein orcid: 0000-0002-3732-2236 - first_name: Kay-Peter full_name: Hoyer, Kay-Peter id: '48411' last_name: Hoyer - first_name: Mirko full_name: Schaper, Mirko id: '43720' last_name: Schaper citation: ama: 'Pramanik S, Milaege D, Hein M, Hoyer K-P, Schaper M. Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach. Crystals. 2023;13(11). doi:10.3390/cryst13111592' apa: 'Pramanik, S., Milaege, D., Hein, M., Hoyer, K.-P., & Schaper, M. (2023). Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach. Crystals, 13(11), Article 1592. https://doi.org/10.3390/cryst13111592' bibtex: '@article{Pramanik_Milaege_Hein_Hoyer_Schaper_2023, title={Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach}, volume={13}, DOI={10.3390/cryst13111592}, number={111592}, journal={Crystals}, publisher={MDPI AG}, author={Pramanik, Sudipta and Milaege, Dennis and Hein, Maxwell and Hoyer, Kay-Peter and Schaper, Mirko}, year={2023} }' chicago: 'Pramanik, Sudipta, Dennis Milaege, Maxwell Hein, Kay-Peter Hoyer, and Mirko Schaper. “Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach.” Crystals 13, no. 11 (2023). https://doi.org/10.3390/cryst13111592.' ieee: 'S. Pramanik, D. Milaege, M. Hein, K.-P. Hoyer, and M. Schaper, “Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach,” Crystals, vol. 13, no. 11, Art. no. 1592, 2023, doi: 10.3390/cryst13111592.' mla: 'Pramanik, Sudipta, et al. “Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach.” Crystals, vol. 13, no. 11, 1592, MDPI AG, 2023, doi:10.3390/cryst13111592.' short: S. Pramanik, D. Milaege, M. Hein, K.-P. Hoyer, M. Schaper, Crystals 13 (2023). date_created: 2023-11-21T15:29:49Z date_updated: 2023-11-21T15:30:57Z department: - _id: '9' - _id: '158' doi: 10.3390/cryst13111592 intvolume: ' 13' issue: '11' keyword: - Inorganic Chemistry - Condensed Matter Physics - General Materials Science - General Chemical Engineering language: - iso: eng publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published publisher: MDPI AG quality_controlled: '1' status: public title: 'Additive Manufacturing and Mechanical Properties of Auxetic and Non-Auxetic Ti24Nb4Zr8Sn Biomedical Stents: A Combined Experimental and Computational Modelling Approach' type: journal_article user_id: '48411' volume: 13 year: '2023' ... --- _id: '33484' abstract: - lang: eng text: We study the DC conductivity in potassium titanyl phosphate (KTiOPO4, KTP) and its isomorphs KTiOAsO4 (KTA) and Rb1%K99%TiOPO4 (RKTP) and introduce a method by which to reduce the overall ionic conductivity in KTP by a potassium nitrate treatment. Furthermore, we create so-called gray tracking in KTP and investigate the ionic conductivity in theses areas. A local unintended reduction of the ionic conductivity is observed in the gray-tracked regions, which also induce additional optical absorption in the material. We show that a thermal treatment in an oxygen-rich atmosphere removes the gray tracking and brings the ionic conductivity as well as the optical transmission back to the original level. These studies can help to choose the best material and treatment for specific applications. author: - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Viktor full_name: Quiring, Viktor last_name: Quiring - first_name: Adriana full_name: Bocchini, Adriana id: '58349' last_name: Bocchini orcid: 0000-0002-2134-3075 - first_name: Matteo full_name: Santandrea, Matteo id: '55095' last_name: Santandrea orcid: 0000-0001-5718-358X - first_name: Uwe full_name: Gerstmann, Uwe id: '171' last_name: Gerstmann orcid: 0000-0002-4476-223X - first_name: Wolf Gero full_name: Schmidt, Wolf Gero id: '468' last_name: Schmidt orcid: 0000-0002-2717-5076 - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 citation: ama: 'Padberg L, Quiring V, Bocchini A, et al. DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking. Crystals. 2022;12:1359. doi:10.3390/cryst12101359' apa: 'Padberg, L., Quiring, V., Bocchini, A., Santandrea, M., Gerstmann, U., Schmidt, W. G., Silberhorn, C., & Eigner, C. (2022). DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking. Crystals, 12, 1359. https://doi.org/10.3390/cryst12101359' bibtex: '@article{Padberg_Quiring_Bocchini_Santandrea_Gerstmann_Schmidt_Silberhorn_Eigner_2022, title={DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking}, volume={12}, DOI={10.3390/cryst12101359}, journal={Crystals}, author={Padberg, Laura and Quiring, Viktor and Bocchini, Adriana and Santandrea, Matteo and Gerstmann, Uwe and Schmidt, Wolf Gero and Silberhorn, Christine and Eigner, Christof}, year={2022}, pages={1359} }' chicago: 'Padberg, Laura, Viktor Quiring, Adriana Bocchini, Matteo Santandrea, Uwe Gerstmann, Wolf Gero Schmidt, Christine Silberhorn, and Christof Eigner. “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking.” Crystals 12 (2022): 1359. https://doi.org/10.3390/cryst12101359.' ieee: 'L. Padberg et al., “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking,” Crystals, vol. 12, p. 1359, 2022, doi: 10.3390/cryst12101359.' mla: 'Padberg, Laura, et al. “DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking.” Crystals, vol. 12, 2022, p. 1359, doi:10.3390/cryst12101359.' short: L. Padberg, V. Quiring, A. Bocchini, M. Santandrea, U. Gerstmann, W.G. Schmidt, C. Silberhorn, C. Eigner, Crystals 12 (2022) 1359. date_created: 2022-09-26T13:12:48Z date_updated: 2023-04-21T11:07:11Z department: - _id: '15' - _id: '288' - _id: '623' - _id: '170' - _id: '295' - _id: '230' - _id: '429' - _id: '35' - _id: '790' doi: 10.3390/cryst12101359 intvolume: ' 12' language: - iso: eng main_file_link: - open_access: '1' oa: '1' page: '1359' project: - _id: '53' name: 'TRR 142: TRR 142' - _id: '55' name: 'TRR 142 - B: TRR 142 - Project Area B' - _id: '52' name: 'PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing' - _id: '168' name: 'TRR 142 - B07: TRR 142 - Subproject B07' - _id: '54' name: 'TRR 142 - A: TRR 142 - Project Area A' - _id: '166' name: 'TRR 142 - A11: TRR 142 - Subproject A11' publication: Crystals publication_identifier: issn: - 2073-4352 status: public title: 'DC Ionic Conductivity in KTP and Its Isomorphs: Properties, Methods for Suppression, and Its Connection to Gray Tracking' type: journal_article user_id: '171' volume: 12 year: '2022' ... --- _id: '41497' abstract: - lang: eng text: In this study, the design, additive manufacturing and experimental as well as simulation investigation of mechanical and thermal properties of cellular solids are addressed. For this, two cellular solids having nested and non-nested structures are designed and additively manufactured via laser powder bed fusion. The primary objective is to design cellular solids which absorb a significant amount of energy upon impact loading without transmitting a high amount of stress into the cellular solids. Therefore, compression testing of the two cellular solids is performed. The nested and non-nested cellular solids show similar energy absorption properties; however, the nested cellular solid transmits a lower amount of stress in the cellular structure compared to the non-nested cellular solid. The experimentally measured strain (by DIC) in the interior region of the nested cellular solid is lower despite a higher value of externally imposed compressive strain. The second objective of this study is to determine the thermal insulation properties of cellular solids. For measuring the thermal insulation properties, the samples are placed on a hot plate; and the surface temperature distribution is measured by an infrared camera. The thermal insulating performance of both cellular types is sufficient for temperatures exceeding 100 °C. However, the thermal insulating performance of a non-nested cellular solid is slightly better than that of the nested cellular solid. Additional thermal simulations predict a relatively higher temperature distribution on the cellular solid surfaces compared to experimental results. The simulated residual stress shows a similar distribution for both types, but the magnitude of residual stress is different for the cellular solids upon cooling from different temperatures of the hot plate. article_number: '1217' author: - first_name: Sudipta full_name: Pramanik, Sudipta last_name: Pramanik - first_name: Dennis full_name: Milaege, Dennis last_name: Milaege - first_name: Kay-Peter full_name: Hoyer, Kay-Peter id: '48411' last_name: Hoyer - first_name: Mirko full_name: Schaper, Mirko id: '43720' last_name: Schaper citation: ama: 'Pramanik S, Milaege D, Hoyer K-P, Schaper M. Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study. Crystals. 2022;12(9). doi:10.3390/cryst12091217' apa: 'Pramanik, S., Milaege, D., Hoyer, K.-P., & Schaper, M. (2022). Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study. Crystals, 12(9), Article 1217. https://doi.org/10.3390/cryst12091217' bibtex: '@article{Pramanik_Milaege_Hoyer_Schaper_2022, title={Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study}, volume={12}, DOI={10.3390/cryst12091217}, number={91217}, journal={Crystals}, publisher={MDPI AG}, author={Pramanik, Sudipta and Milaege, Dennis and Hoyer, Kay-Peter and Schaper, Mirko}, year={2022} }' chicago: 'Pramanik, Sudipta, Dennis Milaege, Kay-Peter Hoyer, and Mirko Schaper. “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study.” Crystals 12, no. 9 (2022). https://doi.org/10.3390/cryst12091217.' ieee: 'S. Pramanik, D. Milaege, K.-P. Hoyer, and M. Schaper, “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study,” Crystals, vol. 12, no. 9, Art. no. 1217, 2022, doi: 10.3390/cryst12091217.' mla: 'Pramanik, Sudipta, et al. “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study.” Crystals, vol. 12, no. 9, 1217, MDPI AG, 2022, doi:10.3390/cryst12091217.' short: S. Pramanik, D. Milaege, K.-P. Hoyer, M. Schaper, Crystals 12 (2022). date_created: 2023-02-02T14:27:40Z date_updated: 2023-04-27T16:45:48Z department: - _id: '9' - _id: '158' doi: 10.3390/cryst12091217 intvolume: ' 12' issue: '9' keyword: - Inorganic Chemistry - Condensed Matter Physics - General Materials Science - General Chemical Engineering language: - iso: eng publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published publisher: MDPI AG quality_controlled: '1' status: public title: 'Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study' type: journal_article user_id: '43720' volume: 12 year: '2022' ... --- _id: '41489' abstract: - lang: eng text: In this study, the design, additive manufacturing and experimental as well as simulation investigation of mechanical and thermal properties of cellular solids are addressed. For this, two cellular solids having nested and non-nested structures are designed and additively manufactured via laser powder bed fusion. The primary objective is to design cellular solids which absorb a significant amount of energy upon impact loading without transmitting a high amount of stress into the cellular solids. Therefore, compression testing of the two cellular solids is performed. The nested and non-nested cellular solids show similar energy absorption properties; however, the nested cellular solid transmits a lower amount of stress in the cellular structure compared to the non-nested cellular solid. The experimentally measured strain (by DIC) in the interior region of the nested cellular solid is lower despite a higher value of externally imposed compressive strain. The second objective of this study is to determine the thermal insulation properties of cellular solids. For measuring the thermal insulation properties, the samples are placed on a hot plate; and the surface temperature distribution is measured by an infrared camera. The thermal insulating performance of both cellular types is sufficient for temperatures exceeding 100 °C. However, the thermal insulating performance of a non-nested cellular solid is slightly better than that of the nested cellular solid. Additional thermal simulations predict a relatively higher temperature distribution on the cellular solid surfaces compared to experimental results. The simulated residual stress shows a similar distribution for both types, but the magnitude of residual stress is different for the cellular solids upon cooling from different temperatures of the hot plate. article_number: '1217' author: - first_name: Sudipta full_name: Pramanik, Sudipta last_name: Pramanik - first_name: Dennis full_name: Milaege, Dennis last_name: Milaege - first_name: Kay-Peter full_name: Hoyer, Kay-Peter last_name: Hoyer - first_name: Mirko full_name: Schaper, Mirko last_name: Schaper citation: ama: 'Pramanik S, Milaege D, Hoyer K-P, Schaper M. Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study. Crystals. 2022;12(9). doi:10.3390/cryst12091217' apa: 'Pramanik, S., Milaege, D., Hoyer, K.-P., & Schaper, M. (2022). Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study. Crystals, 12(9), Article 1217. https://doi.org/10.3390/cryst12091217' bibtex: '@article{Pramanik_Milaege_Hoyer_Schaper_2022, title={Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study}, volume={12}, DOI={10.3390/cryst12091217}, number={91217}, journal={Crystals}, publisher={MDPI AG}, author={Pramanik, Sudipta and Milaege, Dennis and Hoyer, Kay-Peter and Schaper, Mirko}, year={2022} }' chicago: 'Pramanik, Sudipta, Dennis Milaege, Kay-Peter Hoyer, and Mirko Schaper. “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study.” Crystals 12, no. 9 (2022). https://doi.org/10.3390/cryst12091217.' ieee: 'S. Pramanik, D. Milaege, K.-P. Hoyer, and M. Schaper, “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study,” Crystals, vol. 12, no. 9, Art. no. 1217, 2022, doi: 10.3390/cryst12091217.' mla: 'Pramanik, Sudipta, et al. “Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study.” Crystals, vol. 12, no. 9, 1217, MDPI AG, 2022, doi:10.3390/cryst12091217.' short: S. Pramanik, D. Milaege, K.-P. Hoyer, M. Schaper, Crystals 12 (2022). date_created: 2023-02-02T14:22:59Z date_updated: 2023-04-27T16:48:04Z department: - _id: '9' - _id: '158' doi: 10.3390/cryst12091217 intvolume: ' 12' issue: '9' keyword: - Inorganic Chemistry - Condensed Matter Physics - General Materials Science - General Chemical Engineering language: - iso: eng publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published publisher: MDPI AG status: public title: 'Additively Manufactured Nested and Non-Nested Cellular Solids for Effective Stress Distribution and Thermal Insulation Applications: An Experimental and Finite Element Analysis Study' type: journal_article user_id: '48411' volume: 12 year: '2022' ... --- _id: '23826' abstract: - lang: eng text: Potassium titanyl phosphate (KTP) is a nonlinear optical material with applications in high-power frequency conversion or quasi-phase matching in submicron period domain grids. A prerequisite for these applications is a precise control and understanding of the poling mechanisms to enable the fabrication of high-grade domain grids. In contrast to the widely used material lithium niobate, the domain growth in KTP is less studied, because many standard methods, such as selective etching or polarization microscopy, provides less insight or are not applicable on non-polar surfaces, respectively. In this work, we present results of confocal Raman-spectroscopy of the ferroelectric domain structure in KTP. This analytical method allows for the visualization of domain grids of the non-polar KTP y-face and therefore more insight into the domain-growth and -structure in KTP, which can be used for improved domain fabrication. article_number: '1086' author: - first_name: Julian full_name: Brockmeier, Julian id: '44807' last_name: Brockmeier - first_name: Peter Walter Martin full_name: Mackwitz, Peter Walter Martin last_name: Mackwitz - first_name: Michael full_name: Rüsing, Michael id: '22501' last_name: Rüsing orcid: 0000-0003-4682-4577 - first_name: Christof full_name: Eigner, Christof id: '13244' last_name: Eigner orcid: https://orcid.org/0000-0002-5693-3083 - first_name: Laura full_name: Padberg, Laura id: '40300' last_name: Padberg - first_name: Matteo full_name: Santandrea, Matteo id: '55095' last_name: Santandrea orcid: 0000-0001-5718-358X - first_name: Christine full_name: Silberhorn, Christine id: '26263' last_name: Silberhorn - first_name: Artur full_name: Zrenner, Artur id: '606' last_name: Zrenner orcid: 0000-0002-5190-0944 - first_name: Gerhard full_name: Berth, Gerhard id: '53' last_name: Berth citation: ama: Brockmeier J, Mackwitz PWM, Rüsing M, et al. Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging. Crystals. Published online 2021. doi:10.3390/cryst11091086 apa: Brockmeier, J., Mackwitz, P. W. M., Rüsing, M., Eigner, C., Padberg, L., Santandrea, M., Silberhorn, C., Zrenner, A., & Berth, G. (2021). Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging. Crystals, Article 1086. https://doi.org/10.3390/cryst11091086 bibtex: '@article{Brockmeier_Mackwitz_Rüsing_Eigner_Padberg_Santandrea_Silberhorn_Zrenner_Berth_2021, title={Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging}, DOI={10.3390/cryst11091086}, number={1086}, journal={Crystals}, author={Brockmeier, Julian and Mackwitz, Peter Walter Martin and Rüsing, Michael and Eigner, Christof and Padberg, Laura and Santandrea, Matteo and Silberhorn, Christine and Zrenner, Artur and Berth, Gerhard}, year={2021} }' chicago: Brockmeier, Julian, Peter Walter Martin Mackwitz, Michael Rüsing, Christof Eigner, Laura Padberg, Matteo Santandrea, Christine Silberhorn, Artur Zrenner, and Gerhard Berth. “Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging.” Crystals, 2021. https://doi.org/10.3390/cryst11091086. ieee: 'J. Brockmeier et al., “Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging,” Crystals, Art. no. 1086, 2021, doi: 10.3390/cryst11091086.' mla: Brockmeier, Julian, et al. “Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging.” Crystals, 1086, 2021, doi:10.3390/cryst11091086. short: J. Brockmeier, P.W.M. Mackwitz, M. Rüsing, C. Eigner, L. Padberg, M. Santandrea, C. Silberhorn, A. Zrenner, G. Berth, Crystals (2021). date_created: 2021-09-07T08:09:36Z date_updated: 2023-10-06T07:40:37Z department: - _id: '15' - _id: '288' doi: 10.3390/cryst11091086 language: - iso: eng publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published status: public title: Non-Invasive Visualization of Ferroelectric Domain Structures on the Non-Polar y-Surface of KTiOPO4 via Raman Imaging type: journal_article user_id: '13244' year: '2021' ... --- _id: '47963' abstract: - lang: eng text: Nonlinear and quantum optical devices based on periodically-poled thin film lithium niobate (PP-TFLN) have gained considerable interest lately, due to their significantly improved performance as compared to their bulk counterparts. Nevertheless, performance parameters such as conversion efficiency, minimum pump power, and spectral bandwidth strongly depend on the quality of the domain structure in these PP-TFLN samples, e.g., their homogeneity and duty cycle, as well as on the overlap and penetration depth of domains with the waveguide mode. Hence, in order to propose improved fabrication protocols, a profound quality control of domain structures is needed that allows quantifying and thoroughly analyzing these parameters. In this paper, we propose to combine a set of nanometer-to-micrometer-scale imaging techniques, i.e., piezoresponse force microscopy (PFM), second-harmonic generation (SHG), and Raman spectroscopy (RS), to access the relevant and crucial sample properties through cross-correlating these methods. Based on our findings, we designate SHG to be the best-suited standard imaging technique for this purpose, in particular when investigating the domain poling process in x-cut TFLNs. While PFM is excellently recommended for near-surface high-resolution imaging, RS provides thorough insights into stress and/or defect distributions, as associated with these domain structures. In this context, our work here indicates unexpectedly large signs for internal fields occurring in x-cut PP-TFLNs that are substantially larger as compared to previous observations in bulk LN. article_number: '288' article_type: original author: - first_name: Sven full_name: Reitzig, Sven last_name: Reitzig - first_name: Michael full_name: Rüsing, Michael id: '22501' last_name: Rüsing orcid: 0000-0003-4682-4577 - first_name: Jie full_name: Zhao, Jie last_name: Zhao - first_name: Benjamin full_name: Kirbus, Benjamin last_name: Kirbus - first_name: Shayan full_name: Mookherjea, Shayan last_name: Mookherjea - first_name: Lukas M. full_name: Eng, Lukas M. last_name: Eng citation: ama: Reitzig S, Rüsing M, Zhao J, Kirbus B, Mookherjea S, Eng LM. “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films. Crystals. 2021;11(3). doi:10.3390/cryst11030288 apa: Reitzig, S., Rüsing, M., Zhao, J., Kirbus, B., Mookherjea, S., & Eng, L. M. (2021). “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films. Crystals, 11(3), Article 288. https://doi.org/10.3390/cryst11030288 bibtex: '@article{Reitzig_Rüsing_Zhao_Kirbus_Mookherjea_Eng_2021, title={“Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films}, volume={11}, DOI={10.3390/cryst11030288}, number={3288}, journal={Crystals}, publisher={MDPI AG}, author={Reitzig, Sven and Rüsing, Michael and Zhao, Jie and Kirbus, Benjamin and Mookherjea, Shayan and Eng, Lukas M.}, year={2021} }' chicago: Reitzig, Sven, Michael Rüsing, Jie Zhao, Benjamin Kirbus, Shayan Mookherjea, and Lukas M. Eng. “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films.” Crystals 11, no. 3 (2021). https://doi.org/10.3390/cryst11030288. ieee: 'S. Reitzig, M. Rüsing, J. Zhao, B. Kirbus, S. Mookherjea, and L. M. Eng, “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films,” Crystals, vol. 11, no. 3, Art. no. 288, 2021, doi: 10.3390/cryst11030288.' mla: Reitzig, Sven, et al. “‘Seeing Is Believing’—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films.” Crystals, vol. 11, no. 3, 288, MDPI AG, 2021, doi:10.3390/cryst11030288. short: S. Reitzig, M. Rüsing, J. Zhao, B. Kirbus, S. Mookherjea, L.M. Eng, Crystals 11 (2021). date_created: 2023-10-11T08:19:51Z date_updated: 2023-10-11T08:20:25Z doi: 10.3390/cryst11030288 extern: '1' intvolume: ' 11' issue: '3' keyword: - Inorganic Chemistry - Condensed Matter Physics - General Materials Science - General Chemical Engineering language: - iso: eng publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published publisher: MDPI AG quality_controlled: '1' status: public title: “Seeing Is Believing”—In-Depth Analysis by Co-Imaging of Periodically-Poled X-Cut Lithium Niobate Thin Films type: journal_article user_id: '22501' volume: 11 year: '2021' ... --- _id: '47964' abstract: - lang: eng text: In the last two decades, variably doped strontium barium niobate (SBN) has attracted a lot of scientific interest mainly due to its specific non-linear optical response. Comparably, the parental compound, i.e., undoped SBN, appears to be less studied so far. Here, two different cuts of single-crystalline nominally pure strontium barium niobate in the composition Sr0.61Ba0.39Nb2O6 (SBN61) are comprehensively studied and analyzed with regard to their photoconductive responses. We present conductance measurements under systematically varied illumination conditions along either the polar z-axis or perpendicular to it (x-cut). Apart from a pronounced photoconductance (PC) already under daylight and a large effect upon super-bandgap illumination in general, we observe (i) distinct spectral features when sweeping the excitation wavelength over the sub-bandgap region as then discussed in the context of deep and shallow trap states, (ii) extremely slow long-term relaxation for both light-on and light-off transients in the range of hours and days, (iii) a critical dependence of the photoresponse on the pre-illumination history of the sample, and (iv) a current–voltage hysteresis depending on both the illumination and the electrical-measurement conditions in a complex manner. article_number: '780' article_type: original author: - first_name: Elke full_name: Beyreuther, Elke last_name: Beyreuther - first_name: Julius full_name: Ratzenberger, Julius last_name: Ratzenberger - first_name: Matthias full_name: Roeper, Matthias last_name: Roeper - first_name: Benjamin full_name: Kirbus, Benjamin last_name: Kirbus - first_name: Michael full_name: Rüsing, Michael id: '22501' last_name: Rüsing orcid: 0000-0003-4682-4577 - first_name: Liudmila I. full_name: Ivleva, Liudmila I. last_name: Ivleva - first_name: Lukas M. full_name: Eng, Lukas M. last_name: Eng citation: ama: Beyreuther E, Ratzenberger J, Roeper M, et al. Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. Crystals. 2021;11(7). doi:10.3390/cryst11070780 apa: Beyreuther, E., Ratzenberger, J., Roeper, M., Kirbus, B., Rüsing, M., Ivleva, L. I., & Eng, L. M. (2021). Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals. Crystals, 11(7), Article 780. https://doi.org/10.3390/cryst11070780 bibtex: '@article{Beyreuther_Ratzenberger_Roeper_Kirbus_Rüsing_Ivleva_Eng_2021, title={Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals}, volume={11}, DOI={10.3390/cryst11070780}, number={7780}, journal={Crystals}, publisher={MDPI AG}, author={Beyreuther, Elke and Ratzenberger, Julius and Roeper, Matthias and Kirbus, Benjamin and Rüsing, Michael and Ivleva, Liudmila I. and Eng, Lukas M.}, year={2021} }' chicago: Beyreuther, Elke, Julius Ratzenberger, Matthias Roeper, Benjamin Kirbus, Michael Rüsing, Liudmila I. Ivleva, and Lukas M. Eng. “Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals.” Crystals 11, no. 7 (2021). https://doi.org/10.3390/cryst11070780. ieee: 'E. Beyreuther et al., “Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals,” Crystals, vol. 11, no. 7, Art. no. 780, 2021, doi: 10.3390/cryst11070780.' mla: Beyreuther, Elke, et al. “Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals.” Crystals, vol. 11, no. 7, 780, MDPI AG, 2021, doi:10.3390/cryst11070780. short: E. Beyreuther, J. Ratzenberger, M. Roeper, B. Kirbus, M. Rüsing, L.I. Ivleva, L.M. Eng, Crystals 11 (2021). date_created: 2023-10-11T08:20:40Z date_updated: 2023-10-11T08:21:17Z doi: 10.3390/cryst11070780 extern: '1' funded_apc: '1' intvolume: ' 11' issue: '7' keyword: - Inorganic Chemistry - Condensed Matter Physics - General Materials Science - General Chemical Engineering language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.3390/cryst11070780 oa: '1' publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published publisher: MDPI AG quality_controlled: '1' status: public title: Photoconduction of Polar and Nonpolar Cuts of Undoped Sr0.61Ba0.39Nb2O6 Single Crystals type: journal_article user_id: '22501' volume: 11 year: '2021' ... --- _id: '13650' abstract: - lang: eng text: Surfaces covered with layers of ultrathin nanoantenna structures—so called metasurfaces have recently been proven capable of completely controlling phase of light. Metalenses have emerged from the advance in the development of metasurfaces providing a new basis for recasting traditional lenses into thin, planar optical components capable of focusing light. The lens made of arrays of plasmonic gold nanorods were fabricated on a glass substrate by using electron beam lithography. A 1064 nm laser was used to create a high intensity circularly polarized light focal spot through metalens of focal length 800 µm, N.A. = 0.6 fabricated based on Pancharatnam-Berry phase principle. We demonstrated that optical rotation of birefringent nematic liquid crystal droplets trapped in the laser beam was possible through this metalens. The rotation of birefringent droplets convinced that the optical trap possesses strong enough angular momentum of light from radiation of each nanostructure acting like a local half waveplate and introducing an orientation-dependent phase to light. Here, we show the success in creating a miniaturized and robust metalens based optical tweezers system capable of rotating liquid crystals droplets to imitate an optical motor for future lab-on-a-chip applications. author: - first_name: Satayu full_name: Suwannasopon, Satayu last_name: Suwannasopon - first_name: Fabian full_name: Meyer, Fabian last_name: Meyer - first_name: Christian full_name: Schlickriede, Christian id: '59792' last_name: Schlickriede - first_name: Papichaya full_name: Chaisakul, Papichaya last_name: Chaisakul - first_name: Jiraroj full_name: T-Thienprasert, Jiraroj last_name: T-Thienprasert - first_name: Jumras full_name: Limtrakul, Jumras last_name: Limtrakul - first_name: Thomas full_name: Zentgraf, Thomas id: '30525' last_name: Zentgraf orcid: 0000-0002-8662-1101 - first_name: Nattaporn full_name: Chattham, Nattaporn last_name: Chattham citation: ama: Suwannasopon S, Meyer F, Schlickriede C, et al. Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors. Crystals. 2019;9(10):515. doi:10.3390/cryst9100515 apa: Suwannasopon, S., Meyer, F., Schlickriede, C., Chaisakul, P., T-Thienprasert, J., Limtrakul, J., … Chattham, N. (2019). Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors. Crystals, 9(10), 515. https://doi.org/10.3390/cryst9100515 bibtex: '@article{Suwannasopon_Meyer_Schlickriede_Chaisakul_T-Thienprasert_Limtrakul_Zentgraf_Chattham_2019, title={Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors}, volume={9}, DOI={10.3390/cryst9100515}, number={10}, journal={Crystals}, author={Suwannasopon, Satayu and Meyer, Fabian and Schlickriede, Christian and Chaisakul, Papichaya and T-Thienprasert, Jiraroj and Limtrakul, Jumras and Zentgraf, Thomas and Chattham, Nattaporn}, year={2019}, pages={515} }' chicago: 'Suwannasopon, Satayu, Fabian Meyer, Christian Schlickriede, Papichaya Chaisakul, Jiraroj T-Thienprasert, Jumras Limtrakul, Thomas Zentgraf, and Nattaporn Chattham. “Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors.” Crystals 9, no. 10 (2019): 515. https://doi.org/10.3390/cryst9100515.' ieee: S. Suwannasopon et al., “Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors,” Crystals, vol. 9, no. 10, p. 515, 2019. mla: Suwannasopon, Satayu, et al. “Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors.” Crystals, vol. 9, no. 10, 2019, p. 515, doi:10.3390/cryst9100515. short: S. Suwannasopon, F. Meyer, C. Schlickriede, P. Chaisakul, J. T-Thienprasert, J. Limtrakul, T. Zentgraf, N. Chattham, Crystals 9 (2019) 515. date_created: 2019-10-08T06:25:52Z date_updated: 2022-01-06T06:51:41Z department: - _id: '15' - _id: '230' - _id: '289' doi: 10.3390/cryst9100515 intvolume: ' 9' issue: '10' language: - iso: eng page: '515' publication: Crystals publication_identifier: issn: - 2073-4352 publication_status: published status: public title: Miniaturized Metalens Based Optical Tweezers on Liquid Crystal Droplets for Lab-on-a-Chip Optical Motors type: journal_article user_id: '30525' volume: 9 year: '2019' ...