[{"citation":{"ama":"Myroshnychenko V, Mulavarickal Jose PM, Farheen H, Ejaz S, Brosseau C, Förstner J. From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops. <i>Physica Scripta</i>. 2024;99(4):045952. doi:<a href=\"https://doi.org/10.1088/1402-4896/ad3172\">10.1088/1402-4896/ad3172</a>","chicago":"Myroshnychenko, Viktor, Pious Mathews Mulavarickal Jose, Henna Farheen, Shafaq Ejaz, Christian Brosseau, and Jens Förstner. “From Swiss-Cheese to Discrete Ferroelectric Composites: Assessing the Ferroelectric Butterfly Shape in Polarization Loops.” <i>Physica Scripta</i> 99, no. 4 (2024): 045952. <a href=\"https://doi.org/10.1088/1402-4896/ad3172\">https://doi.org/10.1088/1402-4896/ad3172</a>.","ieee":"V. Myroshnychenko, P. M. Mulavarickal Jose, H. Farheen, S. Ejaz, C. Brosseau, and J. Förstner, “From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops,” <i>Physica Scripta</i>, vol. 99, no. 4, p. 045952, 2024, doi: <a href=\"https://doi.org/10.1088/1402-4896/ad3172\">10.1088/1402-4896/ad3172</a>.","apa":"Myroshnychenko, V., Mulavarickal Jose, P. M., Farheen, H., Ejaz, S., Brosseau, C., &#38; Förstner, J. (2024). From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops. <i>Physica Scripta</i>, <i>99</i>(4), 045952. <a href=\"https://doi.org/10.1088/1402-4896/ad3172\">https://doi.org/10.1088/1402-4896/ad3172</a>","short":"V. Myroshnychenko, P.M. Mulavarickal Jose, H. Farheen, S. Ejaz, C. Brosseau, J. Förstner, Physica Scripta 99 (2024) 045952.","mla":"Myroshnychenko, Viktor, et al. “From Swiss-Cheese to Discrete Ferroelectric Composites: Assessing the Ferroelectric Butterfly Shape in Polarization Loops.” <i>Physica Scripta</i>, vol. 99, no. 4, IOP Publishing, 2024, p. 045952, doi:<a href=\"https://doi.org/10.1088/1402-4896/ad3172\">10.1088/1402-4896/ad3172</a>.","bibtex":"@article{Myroshnychenko_Mulavarickal Jose_Farheen_Ejaz_Brosseau_Förstner_2024, title={From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops}, volume={99}, DOI={<a href=\"https://doi.org/10.1088/1402-4896/ad3172\">10.1088/1402-4896/ad3172</a>}, number={4}, journal={Physica Scripta}, publisher={IOP Publishing}, author={Myroshnychenko, Viktor and Mulavarickal Jose, Pious Mathews and Farheen, Henna and Ejaz, Shafaq and Brosseau, Christian and Förstner, Jens}, year={2024}, pages={045952} }"},"intvolume":"        99","page":"045952","publication_status":"published","has_accepted_license":"1","publication_identifier":{"issn":["0031-8949","1402-4896"]},"doi":"10.1088/1402-4896/ad3172","oa":"1","date_updated":"2024-07-22T07:43:53Z","author":[{"last_name":"Myroshnychenko","id":"46371","full_name":"Myroshnychenko, Viktor","first_name":"Viktor"},{"last_name":"Mulavarickal Jose","full_name":"Mulavarickal Jose, Pious Mathews","first_name":"Pious Mathews"},{"full_name":"Farheen, Henna","id":"53444","orcid":"0000-0001-7730-3489","last_name":"Farheen","first_name":"Henna"},{"last_name":"Ejaz","full_name":"Ejaz, Shafaq","first_name":"Shafaq"},{"full_name":"Brosseau, Christian","last_name":"Brosseau","first_name":"Christian"},{"first_name":"Jens","id":"158","full_name":"Förstner, Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862"}],"volume":99,"status":"public","type":"journal_article","file_date_updated":"2024-03-21T10:39:32Z","project":[{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"_id":"52700","user_id":"158","department":[{"_id":"61"},{"_id":"230"}],"year":"2024","issue":"4","title":"From Swiss-cheese to discrete ferroelectric composites: assessing the ferroelectric butterfly shape in polarization loops","publisher":"IOP Publishing","date_created":"2024-03-21T10:34:48Z","abstract":[{"text":"We explore the polarization hysteretic behaviour and field-dependent permittivity of ferroelectric-dielectric 2D materials formed by random dispersions of low permittivity inclusions in a ferroelectric matrix, using finite element simulations. We show how the degree of impenetrability of dielectric inclusions plays a substantial role in controlling the coercive field, remnant and saturation polarizations of the homogenized materials. The results highlight the significance of the degree of impenetrability of inclusion in tuning the effective polarization properties of such ferroelectric composites: coercive field drops significantly as percolation threshold is attained and remnant polarization decreases faster than a linear decay.","lang":"eng"}],"file":[{"relation":"main_file","content_type":"application/pdf","file_size":5386508,"file_name":"2024-03 Myroshnychenko - Physica Scripta - From Swiss-cheese to discrete ferroelectric.pdf","file_id":"52701","access_level":"open_access","date_updated":"2024-03-21T10:39:32Z","creator":"fossie","date_created":"2024-03-21T10:39:32Z"}],"publication":"Physica Scripta","ddc":["530"],"keyword":["tet_topic_ferro"],"language":[{"iso":"eng"}]},{"doi":"10.1088/2515-7647/ad6ed4","volume":6,"author":[{"full_name":"Farheen, Henna","id":"53444","orcid":"0000-0001-7730-3489","last_name":"Farheen","first_name":"Henna"},{"first_name":"Suraj","last_name":"Joshi","full_name":"Joshi, Suraj"},{"first_name":"J. Christoph","orcid":"0000-0002-5950-6618 ","last_name":"Scheytt","full_name":"Scheytt, J. Christoph","id":"37144"},{"first_name":"Viktor","id":"46371","full_name":"Myroshnychenko, Viktor","last_name":"Myroshnychenko"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","full_name":"Förstner, Jens","id":"158","first_name":"Jens"}],"oa":"1","date_updated":"2024-09-02T12:23:55Z","intvolume":"         6","page":"045010","citation":{"ama":"Farheen H, Joshi S, Scheytt JC, Myroshnychenko V, Förstner J. An efficient compact blazed grating antenna for optical phased arrays. <i>Journal of Physics: Photonics</i>. 2024;6:045010. doi:<a href=\"https://doi.org/10.1088/2515-7647/ad6ed4\">10.1088/2515-7647/ad6ed4</a>","chicago":"Farheen, Henna, Suraj Joshi, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “An Efficient Compact Blazed Grating Antenna for Optical Phased Arrays.” <i>Journal of Physics: Photonics</i> 6 (2024): 045010. <a href=\"https://doi.org/10.1088/2515-7647/ad6ed4\">https://doi.org/10.1088/2515-7647/ad6ed4</a>.","ieee":"H. Farheen, S. Joshi, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “An efficient compact blazed grating antenna for optical phased arrays,” <i>Journal of Physics: Photonics</i>, vol. 6, p. 045010, 2024, doi: <a href=\"https://doi.org/10.1088/2515-7647/ad6ed4\">10.1088/2515-7647/ad6ed4</a>.","bibtex":"@article{Farheen_Joshi_Scheytt_Myroshnychenko_Förstner_2024, title={An efficient compact blazed grating antenna for optical phased arrays}, volume={6}, DOI={<a href=\"https://doi.org/10.1088/2515-7647/ad6ed4\">10.1088/2515-7647/ad6ed4</a>}, journal={Journal of Physics: Photonics}, publisher={IOP Publishing}, author={Farheen, Henna and Joshi, Suraj and Scheytt, J. Christoph and Myroshnychenko, Viktor and Förstner, Jens}, year={2024}, pages={045010} }","short":"H. Farheen, S. Joshi, J.C. Scheytt, V. Myroshnychenko, J. Förstner, Journal of Physics: Photonics 6 (2024) 045010.","mla":"Farheen, Henna, et al. “An Efficient Compact Blazed Grating Antenna for Optical Phased Arrays.” <i>Journal of Physics: Photonics</i>, vol. 6, IOP Publishing, 2024, p. 045010, doi:<a href=\"https://doi.org/10.1088/2515-7647/ad6ed4\">10.1088/2515-7647/ad6ed4</a>.","apa":"Farheen, H., Joshi, S., Scheytt, J. C., Myroshnychenko, V., &#38; Förstner, J. (2024). An efficient compact blazed grating antenna for optical phased arrays. <i>Journal of Physics: Photonics</i>, <i>6</i>, 045010. <a href=\"https://doi.org/10.1088/2515-7647/ad6ed4\">https://doi.org/10.1088/2515-7647/ad6ed4</a>"},"publication_identifier":{"issn":["2515-7647"]},"has_accepted_license":"1","publication_status":"published","file_date_updated":"2024-09-02T12:13:55Z","article_type":"original","department":[{"_id":"61"},{"_id":"429"},{"_id":"58"}],"user_id":"158","_id":"55989","project":[{"name":"PhoQC: PhoQC: Photonisches Quantencomputing","_id":"266","grant_number":"PROFILNRW-2020-067"},{"grant_number":"231447078","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"grant_number":"231447078","_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"status":"public","type":"journal_article","title":"An efficient compact blazed grating antenna for optical phased arrays","date_created":"2024-09-02T12:08:18Z","publisher":"IOP Publishing","year":"2024","language":[{"iso":"eng"}],"keyword":["tet_topic_opticalantenna"],"ddc":["530"],"file":[{"relation":"main_file","content_type":"application/pdf","file_id":"55990","file_name":"2024-08 Farheen - JPhys Photonics - An efficient compact blazed grating antenna for optical phased arrays (official version).pdf","access_level":"open_access","file_size":1492402,"date_created":"2024-09-02T12:13:55Z","creator":"fossie","date_updated":"2024-09-02T12:13:55Z"}],"abstract":[{"lang":"eng","text":"Phased arrays are vital in communication systems and have received significant interest in the field of optoelectronics and photonics, enabling a wide range of applications such as LiDAR, holography, wireless communication, etc. In this work, we present a blazed grating antenna that is optimized to have upward radiation efficiency as high as 80% with a compact footprint of 3.5 μm × 2 μm at an operational wavelength of 1.55 μm. Our numerical investigations demonstrate that this antenna in a 64 × 64 phased array configuration is capable of producing desired far-field radiation patterns. Additionally, our antenna possesses a low side lobe level of -9.7 dB and a negligible reflection efficiency of under 1%, making it an attractive candidate for integrated optical phased arrays."}],"publication":"Journal of Physics: Photonics"},{"year":"2023","title":"Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays","publisher":"Elsevier BV","date_created":"2023-12-21T09:30:03Z","abstract":[{"text":"Silicon photonics, in conjunction with complementary metal-oxide-semiconductor (CMOS) fabrication, has greatly enhanced the development of integrated optical phased arrays. This facilitates a dynamic control of light in a compact form factor that enables the synthesis of arbitrary complex wavefronts in the infrared spectrum. We numerically demonstrate a large-scale two-dimensional silicon-based optical phased array (OPA) composed of nanoantennas with circular gratings that are balanced in power and aligned in phase, required for producing elegant radiation patterns in the far-field. For a wavelength of 1.55 μm, we optimize two antennas for the OPA exhibiting an upward radiation efficiency as high as 90%, with almost 6.8% of optical power concentrated in the field of view. Additionally, we believe that the proposed OPAs can be easily fabricated and would have the ability to generate complex holographic images, rendering them an attractive candidate for a wide range of applications like LiDAR sensors, optical trapping, optogenetic stimulation, and augmented-reality displays.","lang":"eng"}],"file":[{"relation":"main_file","content_type":"application/pdf","file_size":3339442,"file_id":"50013","access_level":"open_access","file_name":"2ß23-12 Farheen - PNFA - Optimized, highly efficient silicon antennas for optical phased arrays.pdf","date_updated":"2023-12-21T09:34:17Z","creator":"fossie","date_created":"2023-12-21T09:34:17Z"}],"publication":"Photonics and Nanostructures - Fundamentals and Applications","ddc":["530"],"keyword":["tet_topic_opticalantenna"],"language":[{"iso":"eng"}],"citation":{"apa":"Farheen, H., Strauch, A., Scheytt, J. C., Myroshnychenko, V., &#38; Förstner, J. (2023). Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays. <i>Photonics and Nanostructures - Fundamentals and Applications</i>, <i>58</i>, 101207. <a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">https://doi.org/10.1016/j.photonics.2023.101207</a>","short":"H. Farheen, A. Strauch, J.C. Scheytt, V. Myroshnychenko, J. Förstner, Photonics and Nanostructures - Fundamentals and Applications 58 (2023) 101207.","mla":"Farheen, Henna, et al. “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays.” <i>Photonics and Nanostructures - Fundamentals and Applications</i>, vol. 58, Elsevier BV, 2023, p. 101207, doi:<a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">10.1016/j.photonics.2023.101207</a>.","bibtex":"@article{Farheen_Strauch_Scheytt_Myroshnychenko_Förstner_2023, title={Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays}, volume={58}, DOI={<a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">10.1016/j.photonics.2023.101207</a>}, journal={Photonics and Nanostructures - Fundamentals and Applications}, publisher={Elsevier BV}, author={Farheen, Henna and Strauch, Andreas and Scheytt, J. Christoph and Myroshnychenko, Viktor and Förstner, Jens}, year={2023}, pages={101207} }","chicago":"Farheen, Henna, Andreas Strauch, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays.” <i>Photonics and Nanostructures - Fundamentals and Applications</i> 58 (2023): 101207. <a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">https://doi.org/10.1016/j.photonics.2023.101207</a>.","ieee":"H. Farheen, A. Strauch, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays,” <i>Photonics and Nanostructures - Fundamentals and Applications</i>, vol. 58, p. 101207, 2023, doi: <a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">10.1016/j.photonics.2023.101207</a>.","ama":"Farheen H, Strauch A, Scheytt JC, Myroshnychenko V, Förstner J. Optimized, Highly Efficient Silicon Antennas for Optical Phased Arrays. <i>Photonics and Nanostructures - Fundamentals and Applications</i>. 2023;58:101207. doi:<a href=\"https://doi.org/10.1016/j.photonics.2023.101207\">10.1016/j.photonics.2023.101207</a>"},"intvolume":"        58","page":"101207","publication_status":"published","has_accepted_license":"1","publication_identifier":{"issn":["1569-4410"]},"related_material":{"link":[{"relation":"research_data","url":"https://doi.org/10.5281/zenodo.10044122"}]},"doi":"10.1016/j.photonics.2023.101207","oa":"1","date_updated":"2024-07-22T07:44:33Z","author":[{"first_name":"Henna","last_name":"Farheen","orcid":"0000-0001-7730-3489","id":"53444","full_name":"Farheen, Henna"},{"first_name":"Andreas","full_name":"Strauch, Andreas","last_name":"Strauch"},{"first_name":"J. Christoph","orcid":"0000-0002-5950-6618 ","last_name":"Scheytt","id":"37144","full_name":"Scheytt, J. Christoph"},{"first_name":"Viktor","full_name":"Myroshnychenko, Viktor","id":"46371","last_name":"Myroshnychenko"},{"first_name":"Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","id":"158"}],"volume":58,"status":"public","type":"journal_article","file_date_updated":"2023-12-21T09:34:17Z","project":[{"_id":"266","name":"PhoQC: PhoQC: Photonisches Quantencomputing","grant_number":"PROFILNRW-2020-067"},{"grant_number":"231447078","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)","_id":"167"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"_id":"50012","user_id":"158","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"58"}]},{"keyword":["tet_topic_opticalantenna"],"ddc":["530"],"language":[{"iso":"eng"}],"publication":"Integrated Optics: Devices, Materials, and Technologies XXVII","abstract":[{"lang":"eng","text":"We demonstrate a large-scale two dimensional silicon-based optical phased array (OPA) composed of nanoantennas with circular gratings that are balanced in power and aligned in phase, required for producing desired radiation patterns in the far-field. The OPAs are numerically optimized to have an upward efficiency of up to 90%, targeting radiation concentration mainly in the field of view. We envision that our OPAs have the ability of generating complex holographic images, rendering them an attractive candidate for a wide range of applications like LiDAR sensors, optical trapping, optogenetic stimulation and augmented-reality displays."}],"file":[{"date_updated":"2023-03-22T20:53:11Z","date_created":"2023-03-22T07:41:49Z","creator":"fossie","file_size":1747396,"file_name":"2023-01 Poster Photonics West Henna OPA_A0.pdf","file_id":"43055","access_level":"request","content_type":"application/pdf","relation":"main_file"}],"publisher":"SPIE","date_created":"2023-03-21T12:35:18Z","title":"Optimized silicon antennas for optical phased arrays","year":"2023","_id":"43052","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"user_id":"158","file_date_updated":"2023-03-22T20:53:11Z","type":"conference","editor":[{"full_name":"García-Blanco, Sonia M.","last_name":"García-Blanco","first_name":"Sonia M."},{"first_name":"Pavel","last_name":"Cheben","full_name":"Cheben, Pavel"}],"status":"public","date_updated":"2024-07-22T07:44:46Z","author":[{"first_name":"Henna","full_name":"Farheen, Henna","id":"53444","last_name":"Farheen","orcid":"0000-0001-7730-3489"},{"first_name":"Andreas","full_name":"Strauch, Andreas","last_name":"Strauch"},{"first_name":"J. Christoph","id":"37144","full_name":"Scheytt, J. Christoph","last_name":"Scheytt","orcid":"https://orcid.org/0000-0002-5950-6618"},{"full_name":"Myroshnychenko, Viktor","id":"46371","last_name":"Myroshnychenko","first_name":"Viktor"},{"first_name":"Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","full_name":"Förstner, Jens","id":"158"}],"doi":"10.1117/12.2658716","has_accepted_license":"1","publication_status":"published","page":"124241D ","citation":{"ieee":"H. Farheen, A. Strauch, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Optimized silicon antennas for optical phased arrays,” in <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, 2023, p. 124241D, doi: <a href=\"https://doi.org/10.1117/12.2658716\">10.1117/12.2658716</a>.","chicago":"Farheen, Henna, Andreas Strauch, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Optimized Silicon Antennas for Optical Phased Arrays.” In <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, edited by Sonia M. García-Blanco and Pavel Cheben, 124241D. SPIE, 2023. <a href=\"https://doi.org/10.1117/12.2658716\">https://doi.org/10.1117/12.2658716</a>.","ama":"Farheen H, Strauch A, Scheytt JC, Myroshnychenko V, Förstner J. Optimized silicon antennas for optical phased arrays. In: García-Blanco SM, Cheben P, eds. <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>. SPIE; 2023:124241D. doi:<a href=\"https://doi.org/10.1117/12.2658716\">10.1117/12.2658716</a>","mla":"Farheen, Henna, et al. “Optimized Silicon Antennas for Optical Phased Arrays.” <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2023, p. 124241D, doi:<a href=\"https://doi.org/10.1117/12.2658716\">10.1117/12.2658716</a>.","short":"H. Farheen, A. Strauch, J.C. Scheytt, V. Myroshnychenko, J. Förstner, in: S.M. García-Blanco, P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVII, SPIE, 2023, p. 124241D.","bibtex":"@inproceedings{Farheen_Strauch_Scheytt_Myroshnychenko_Förstner_2023, title={Optimized silicon antennas for optical phased arrays}, DOI={<a href=\"https://doi.org/10.1117/12.2658716\">10.1117/12.2658716</a>}, booktitle={Integrated Optics: Devices, Materials, and Technologies XXVII}, publisher={SPIE}, author={Farheen, Henna and Strauch, Andreas and Scheytt, J. Christoph and Myroshnychenko, Viktor and Förstner, Jens}, editor={García-Blanco, Sonia M. and Cheben, Pavel}, year={2023}, pages={124241D} }","apa":"Farheen, H., Strauch, A., Scheytt, J. C., Myroshnychenko, V., &#38; Förstner, J. (2023). Optimized silicon antennas for optical phased arrays. In S. M. García-Blanco &#38; P. Cheben (Eds.), <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i> (p. 124241D). SPIE. <a href=\"https://doi.org/10.1117/12.2658716\">https://doi.org/10.1117/12.2658716</a>"}},{"abstract":[{"lang":"eng","text":"A key challenge in designing efficient optical phased arrays is the lack of a well-designed radiator. This work explores horn antennas numerically optimized to target high upward radiation efficiency to be employed in silicon-based phased arrays capable of producing elegant radiation patterns in the far-field."}],"status":"public","publication":"2023 IEEE Photonics Conference (IPC)","type":"conference","keyword":["tet_topic_opticalantenna"],"language":[{"iso":"eng"}],"_id":"50466","project":[{"_id":"266","name":"PhoQC: PhoQC: Photonisches Quantencomputing","grant_number":"PROFILNRW-2020-067"},{"_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)","grant_number":"231447078"},{"grant_number":"231447078","name":"TRR 142 - C05: TRR 142 - Nichtlineare optische Oberflächen basierend auf ZnO-plasmonischen Hybrid-Nanostrukturen (C05)","_id":"75"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"user_id":"158","year":"2023","citation":{"apa":"Farheen, H., Joshi, S., Scheytt, J. C., Myroshnychenko, V., &#38; Förstner, J. (2023). Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas. <i>2023 IEEE Photonics Conference (IPC)</i>. <a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">https://doi.org/10.1109/ipc57732.2023.10360519</a>","mla":"Farheen, Henna, et al. “Increasing the Upward Radiation Efficiency of Optical Phased Arrays Using Asymmetric Silicon Horn Antennas.” <i>2023 IEEE Photonics Conference (IPC)</i>, IEEE, 2023, doi:<a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">10.1109/ipc57732.2023.10360519</a>.","bibtex":"@inproceedings{Farheen_Joshi_Scheytt_Myroshnychenko_Förstner_2023, title={Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas}, DOI={<a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">10.1109/ipc57732.2023.10360519</a>}, booktitle={2023 IEEE Photonics Conference (IPC)}, publisher={IEEE}, author={Farheen, Henna and Joshi, S. and Scheytt, J. Christoph and Myroshnychenko, Viktor and Förstner, Jens}, year={2023} }","short":"H. Farheen, S. Joshi, J.C. Scheytt, V. Myroshnychenko, J. Förstner, in: 2023 IEEE Photonics Conference (IPC), IEEE, 2023.","chicago":"Farheen, Henna, S. Joshi, J. Christoph Scheytt, Viktor Myroshnychenko, and Jens Förstner. “Increasing the Upward Radiation Efficiency of Optical Phased Arrays Using Asymmetric Silicon Horn Antennas.” In <i>2023 IEEE Photonics Conference (IPC)</i>. IEEE, 2023. <a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">https://doi.org/10.1109/ipc57732.2023.10360519</a>.","ieee":"H. Farheen, S. Joshi, J. C. Scheytt, V. Myroshnychenko, and J. Förstner, “Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas,” 2023, doi: <a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">10.1109/ipc57732.2023.10360519</a>.","ama":"Farheen H, Joshi S, Scheytt JC, Myroshnychenko V, Förstner J. Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas. In: <i>2023 IEEE Photonics Conference (IPC)</i>. IEEE; 2023. doi:<a href=\"https://doi.org/10.1109/ipc57732.2023.10360519\">10.1109/ipc57732.2023.10360519</a>"},"publication_status":"published","title":"Increasing the upward radiation efficiency of optical phased arrays using asymmetric silicon horn antennas","doi":"10.1109/ipc57732.2023.10360519","date_updated":"2024-07-22T07:48:53Z","publisher":"IEEE","author":[{"first_name":"Henna","orcid":"0000-0001-7730-3489","last_name":"Farheen","full_name":"Farheen, Henna","id":"53444"},{"full_name":"Joshi, S.","last_name":"Joshi","first_name":"S."},{"id":"37144","full_name":"Scheytt, J. Christoph","last_name":"Scheytt","orcid":"0000-0002-5950-6618 ","first_name":"J. Christoph"},{"first_name":"Viktor","last_name":"Myroshnychenko","full_name":"Myroshnychenko, Viktor","id":"46371"},{"first_name":"Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","full_name":"Förstner, Jens","id":"158"}],"date_created":"2024-01-12T07:37:54Z"},{"author":[{"first_name":"David","last_name":"Hähnel","full_name":"Hähnel, David"},{"first_name":"Christian","last_name":"Golla","full_name":"Golla, Christian"},{"full_name":"Albert, Maximilian","last_name":"Albert","first_name":"Maximilian"},{"last_name":"Zentgraf","orcid":"0000-0002-8662-1101","full_name":"Zentgraf, Thomas","id":"30525","first_name":"Thomas"},{"first_name":"Viktor","id":"46371","full_name":"Myroshnychenko, Viktor","last_name":"Myroshnychenko"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","full_name":"Förstner, Jens","id":"158","first_name":"Jens"},{"first_name":"Cedrik","full_name":"Meier, Cedrik","id":"20798","last_name":"Meier","orcid":"https://orcid.org/0000-0002-3787-3572"}],"volume":12,"date_updated":"2023-04-21T10:04:05Z","oa":"1","doi":"https://doi.org/10.1038/s41377-023-01134-1","publication_status":"published","publication_identifier":{"issn":["2047-7538"]},"has_accepted_license":"1","citation":{"chicago":"Hähnel, David, Christian Golla, Maximilian Albert, Thomas Zentgraf, Viktor Myroshnychenko, Jens Förstner, and Cedrik Meier. “A Multi-Mode Super-Fano Mechanism for Enhanced Third Harmonic Generation in Silicon Metasurfaces.” <i>Light: Science &#38; Applications</i> 12, no. 1 (2023): 97. <a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>.","ieee":"D. Hähnel <i>et al.</i>, “A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces,” <i>Light: Science &#38; Applications</i>, vol. 12, no. 1, p. 97, 2023, doi: <a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>.","ama":"Hähnel D, Golla C, Albert M, et al. A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. <i>Light: Science &#38; Applications</i>. 2023;12(1):97. doi:<a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>","mla":"Hähnel, David, et al. “A Multi-Mode Super-Fano Mechanism for Enhanced Third Harmonic Generation in Silicon Metasurfaces.” <i>Light: Science &#38; Applications</i>, vol. 12, no. 1, Springer Nature, 2023, p. 97, doi:<a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>.","short":"D. Hähnel, C. Golla, M. Albert, T. Zentgraf, V. Myroshnychenko, J. Förstner, C. Meier, Light: Science &#38; Applications 12 (2023) 97.","bibtex":"@article{Hähnel_Golla_Albert_Zentgraf_Myroshnychenko_Förstner_Meier_2023, title={A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces}, volume={12}, DOI={<a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>}, number={1}, journal={Light: Science &#38; Applications}, publisher={Springer Nature}, author={Hähnel, David and Golla, Christian and Albert, Maximilian and Zentgraf, Thomas and Myroshnychenko, Viktor and Förstner, Jens and Meier, Cedrik}, year={2023}, pages={97} }","apa":"Hähnel, D., Golla, C., Albert, M., Zentgraf, T., Myroshnychenko, V., Förstner, J., &#38; Meier, C. (2023). A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces. <i>Light: Science &#38; Applications</i>, <i>12</i>(1), 97. <a href=\"https://doi.org/10.1038/s41377-023-01134-1\">https://doi.org/10.1038/s41377-023-01134-1</a>"},"intvolume":"        12","page":"97","user_id":"158","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"_id":"44097","file_date_updated":"2023-04-21T10:03:30Z","article_type":"original","type":"journal_article","status":"public","date_created":"2023-04-21T09:45:07Z","publisher":"Springer Nature","title":"A multi-mode super-fano mechanism for enhanced third harmonic generation in silicon metasurfaces","issue":"1","quality_controlled":"1","year":"2023","language":[{"iso":"eng"}],"ddc":["530"],"keyword":["tet_topic_meta"],"publication":"Light: Science & Applications","file":[{"content_type":"application/pdf","relation":"main_file","date_created":"2023-04-21T10:00:27Z","creator":"fossie","date_updated":"2023-04-21T10:00:27Z","access_level":"open_access","file_name":"2023-04 Hähnel - LSA - Multimode Fano THG.pdf","file_id":"44098","file_size":2088874},{"content_type":"application/pdf","relation":"supplementary_material","date_created":"2023-04-21T10:03:30Z","creator":"fossie","date_updated":"2023-04-21T10:03:30Z","access_level":"open_access","file_id":"44099","file_name":"2023-04 Hähnel - LSA - Multimode Fano THG (supplementary information).pdf","file_size":986743}],"abstract":[{"lang":"eng","text":"We present strong enhancement of third harmonic generation in an amorphous silicon metasurface consisting of elliptical nano resonators. We show that this enhancement originates from a new type of multi-mode Fano mechanism. These ‘Super-Fano’ resonances are investigated numerically in great detail using full-wave simulations. The theoretically predicted behavior of the metasurface is experimentally verified by linear and nonlinear transmission spectroscopy. Moreover, quantitative nonlinear measurements are performed, in which an absolute conversion efficiency as high as ηmax ≈ 2.8 × 10−7 a peak power intensity of 1.2 GW cm−2 is found. Compared to an unpatterned silicon film of the same thickness amplification factors of up to ~900 are demonstrated. Our results pave the way to exploiting a strong Fano-type multi-mode coupling in metasurfaces for high THG in potential applications."}]},{"oa":"1","date_updated":"2023-06-13T09:49:12Z","author":[{"first_name":"David","full_name":"Hähnel, David","last_name":"Hähnel"},{"first_name":"Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","full_name":"Förstner, Jens","id":"158"},{"id":"46371","full_name":"Myroshnychenko, Viktor","last_name":"Myroshnychenko","first_name":"Viktor"}],"main_file_link":[{"open_access":"1"}],"doi":"10.1021/acsphotonics.2c01967","publication_status":"published","publication_identifier":{"issn":["2330-4022","2330-4022"]},"has_accepted_license":"1","citation":{"ama":"Hähnel D, Förstner J, Myroshnychenko V. Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces. <i>ACS Photonics</i>. Published online 2023. doi:<a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">10.1021/acsphotonics.2c01967</a>","ieee":"D. Hähnel, J. Förstner, and V. Myroshnychenko, “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces,” <i>ACS Photonics</i>, 2023, doi: <a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">10.1021/acsphotonics.2c01967</a>.","chicago":"Hähnel, David, Jens Förstner, and Viktor Myroshnychenko. “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.” <i>ACS Photonics</i>, 2023. <a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">https://doi.org/10.1021/acsphotonics.2c01967</a>.","apa":"Hähnel, D., Förstner, J., &#38; Myroshnychenko, V. (2023). Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces. <i>ACS Photonics</i>. <a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">https://doi.org/10.1021/acsphotonics.2c01967</a>","short":"D. Hähnel, J. Förstner, V. Myroshnychenko, ACS Photonics (2023).","mla":"Hähnel, David, et al. “Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.” <i>ACS Photonics</i>, American Chemical Society (ACS), 2023, doi:<a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">10.1021/acsphotonics.2c01967</a>.","bibtex":"@article{Hähnel_Förstner_Myroshnychenko_2023, title={Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces}, DOI={<a href=\"https://doi.org/10.1021/acsphotonics.2c01967\">10.1021/acsphotonics.2c01967</a>}, journal={ACS Photonics}, publisher={American Chemical Society (ACS)}, author={Hähnel, David and Förstner, Jens and Myroshnychenko, Viktor}, year={2023} }"},"project":[{"grant_number":"231447078","_id":"167","name":"TRR 142 - B06: TRR 142 - Ultraschnelle kohärente opto-elektronische Kontrolle eines photonischen Quantensystems (B06*)"},{"name":"TRR 142 - B: TRR 142 - Project Area B","_id":"55"},{"grant_number":"231447078","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","_id":"53"},{"grant_number":"231447078","_id":"75","name":"TRR 142 - C05: TRR 142 - Nichtlineare optische Oberflächen basierend auf ZnO-plasmonischen Hybrid-Nanostrukturen (C05)"},{"_id":"56","name":"TRR 142 - C: TRR 142 - Project Area C"},{"name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing","_id":"52"}],"_id":"45596","user_id":"158","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"file_date_updated":"2023-06-13T09:48:17Z","type":"journal_article","status":"public","publisher":"American Chemical Society (ACS)","date_created":"2023-06-13T09:43:25Z","title":"Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces","year":"2023","ddc":["530"],"keyword":["tet_topic_meta"],"language":[{"iso":"eng"}],"publication":"ACS Photonics","abstract":[{"lang":"eng","text":"Dielectric metasurfaces provide a unique platform for efficient harmonic generation and optical wavefront manipulation at the nanoscale. Tailoring phase and amplitude of a nonlinearly generated wave with a high emission efficiency using resonance-based metasurfaces is a challenging task that often requires state-of-the-art numerical methods. Here, we propose a simple yet effective approach combining a sampling method with a Monte Carlo approach to design the third-harmonic wavefront generated by all-dielectric metasurfaces composed of elliptical silicon nanodisks. Using this approach, we theoretically demonstrate the full nonlinear 2π phase control with a uniform and highest possible amplitude in the considered parameter space, allowing us to design metasurfaces operating as third harmonic beam deflectors capable of steering light into a desired direction with high emission efficiency. The TH beam deflection with a record calculated average conversion efficiency of 1.2 × 10–1 W–2 is achieved. We anticipate that the proposed approach will be widely applied as alternative to commonly used optimization algorithms with higher complexity and implementation effort for the design of metasurfaces with other holographic functionalities."}],"file":[{"file_size":5382111,"file_name":"2023-06 Hähnel - ACS Photonics - Efficient Modeling and Tailoring of Nonlinear Wavefronts in Dielectric Metasurfaces.pdf","file_id":"45597","access_level":"open_access","date_updated":"2023-06-13T09:48:17Z","creator":"fossie","date_created":"2023-06-13T09:48:17Z","relation":"main_file","content_type":"application/pdf"}]},{"publication":"Integrated Optics: Devices, Materials, and Technologies XXVII","file":[{"file_id":"43062","file_name":"2023-01 Poster Photonics West Henna OWA_A0.pdf","access_level":"local","file_size":1426599,"date_created":"2023-03-22T09:25:57Z","creator":"fossie","date_updated":"2023-03-22T09:25:57Z","relation":"main_file","content_type":"application/pdf"}],"abstract":[{"lang":"eng","text":"We demonstrate the numerical and experimental realization of optimized optical traveling-wave antennas made of low-loss dielectric materials. These antennas exhibit highly directive radiation patterns and our studies reveal that this nature comes from two dominant guided TE modes excited in the waveguide-like director of the antenna, in addition to the leaky modes. The optimized antennas possess a broadband nature and have a nearunity radiation efficiency at an operational wavelength of 780 nm. Compared to the previously studied plasmonic antennas for photon emission, our all-dielectric approach demonstrates a new class of highly directional, low-loss, and broadband optical antennas."}],"language":[{"iso":"eng"}],"ddc":["530"],"keyword":["tet_topic_opticalantenna"],"year":"2023","date_created":"2023-03-21T12:28:31Z","publisher":"SPIE","title":"Tailoring the directive nature of optical waveguide antennas","type":"conference","status":"public","editor":[{"last_name":"García-Blanco","full_name":"García-Blanco, Sonia M.","first_name":"Sonia M."},{"full_name":"Cheben, Pavel","last_name":"Cheben","first_name":"Pavel"}],"user_id":"30525","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"623"}],"project":[{"_id":"53","name":"TRR 142: TRR 142 - Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen","grant_number":"231447078"},{"grant_number":"231447078","name":"TRR 142 - A08: TRR 142 - Nichtlineare Kopplung von Zwischenschicht-Exzitonen in van der Waals-Heterostrukturen an plasmonische und dielektrische Nanokavitäten (A08)","_id":"65"}],"_id":"43051","file_date_updated":"2023-03-22T09:25:57Z","publication_status":"published","has_accepted_license":"1","citation":{"bibtex":"@inproceedings{Farheen_Yan_Leuteritz_Qiao_Spreyer_Schlickriede_Quiring_Eigner_Silberhorn_Zentgraf_et al._2023, title={Tailoring the directive nature of optical waveguide antennas}, DOI={<a href=\"https://doi.org/10.1117/12.2658921\">10.1117/12.2658921</a>}, booktitle={Integrated Optics: Devices, Materials, and Technologies XXVII}, publisher={SPIE}, author={Farheen, Henna and Yan, Lok-Yee and Leuteritz, Till and Qiao, Siqi and Spreyer, Florian and Schlickriede, Christian and Quiring, Viktor and Eigner, Christof and Silberhorn, Christine and Zentgraf, Thomas and et al.}, editor={García-Blanco, Sonia M. and Cheben, Pavel}, year={2023}, pages={124241E} }","mla":"Farheen, Henna, et al. “Tailoring the Directive Nature of Optical Waveguide Antennas.” <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, edited by Sonia M. García-Blanco and Pavel Cheben, SPIE, 2023, p. 124241E, doi:<a href=\"https://doi.org/10.1117/12.2658921\">10.1117/12.2658921</a>.","short":"H. Farheen, L.-Y. Yan, T. Leuteritz, S. Qiao, F. Spreyer, C. Schlickriede, V. Quiring, C. Eigner, C. Silberhorn, T. Zentgraf, S. Linden, V. Myroshnychenko, J. Förstner, in: S.M. García-Blanco, P. Cheben (Eds.), Integrated Optics: Devices, Materials, and Technologies XXVII, SPIE, 2023, p. 124241E.","apa":"Farheen, H., Yan, L.-Y., Leuteritz, T., Qiao, S., Spreyer, F., Schlickriede, C., Quiring, V., Eigner, C., Silberhorn, C., Zentgraf, T., Linden, S., Myroshnychenko, V., &#38; Förstner, J. (2023). Tailoring the directive nature of optical waveguide antennas. In S. M. García-Blanco &#38; P. Cheben (Eds.), <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i> (p. 124241E). SPIE. <a href=\"https://doi.org/10.1117/12.2658921\">https://doi.org/10.1117/12.2658921</a>","ama":"Farheen H, Yan L-Y, Leuteritz T, et al. Tailoring the directive nature of optical waveguide antennas. In: García-Blanco SM, Cheben P, eds. <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>. SPIE; 2023:124241E. doi:<a href=\"https://doi.org/10.1117/12.2658921\">10.1117/12.2658921</a>","ieee":"H. Farheen <i>et al.</i>, “Tailoring the directive nature of optical waveguide antennas,” in <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, 2023, p. 124241E, doi: <a href=\"https://doi.org/10.1117/12.2658921\">10.1117/12.2658921</a>.","chicago":"Farheen, Henna, Lok-Yee Yan, Till Leuteritz, Siqi Qiao, Florian Spreyer, Christian Schlickriede, Viktor Quiring, et al. “Tailoring the Directive Nature of Optical Waveguide Antennas.” In <i>Integrated Optics: Devices, Materials, and Technologies XXVII</i>, edited by Sonia M. García-Blanco and Pavel Cheben, 124241E. SPIE, 2023. <a href=\"https://doi.org/10.1117/12.2658921\">https://doi.org/10.1117/12.2658921</a>."},"page":"124241E","author":[{"id":"53444","full_name":"Farheen, Henna","orcid":"0000-0001-7730-3489","last_name":"Farheen","first_name":"Henna"},{"first_name":"Lok-Yee","last_name":"Yan","full_name":"Yan, Lok-Yee"},{"first_name":"Till","last_name":"Leuteritz","full_name":"Leuteritz, Till"},{"last_name":"Qiao","full_name":"Qiao, Siqi","first_name":"Siqi"},{"first_name":"Florian","full_name":"Spreyer, Florian","last_name":"Spreyer"},{"first_name":"Christian","full_name":"Schlickriede, Christian","last_name":"Schlickriede"},{"first_name":"Viktor","full_name":"Quiring, Viktor","last_name":"Quiring"},{"full_name":"Eigner, Christof","last_name":"Eigner","first_name":"Christof"},{"last_name":"Silberhorn","full_name":"Silberhorn, Christine","id":"26263","first_name":"Christine"},{"first_name":"Thomas","id":"30525","full_name":"Zentgraf, Thomas","orcid":"0000-0002-8662-1101","last_name":"Zentgraf"},{"last_name":"Linden","full_name":"Linden, Stefan","first_name":"Stefan"},{"last_name":"Myroshnychenko","full_name":"Myroshnychenko, Viktor","id":"46371","first_name":"Viktor"},{"full_name":"Förstner, Jens","id":"158","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens"}],"date_updated":"2025-05-23T05:57:14Z","doi":"10.1117/12.2658921"},{"oa":"1","date_updated":"2024-07-22T07:45:12Z","author":[{"full_name":"Farheen, Henna","id":"53444","last_name":"Farheen","orcid":"0000-0001-7730-3489","first_name":"Henna"},{"last_name":"Leuteritz","full_name":"Leuteritz, Till","first_name":"Till"},{"full_name":"Linden, Stefan","last_name":"Linden","first_name":"Stefan"},{"id":"46371","full_name":"Myroshnychenko, Viktor","last_name":"Myroshnychenko","first_name":"Viktor"},{"first_name":"Jens","id":"158","full_name":"Förstner, Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner"}],"volume":39,"doi":"10.1364/josab.438514","publication_status":"published","has_accepted_license":"1","publication_identifier":{"issn":["0740-3224","1520-8540"]},"citation":{"apa":"Farheen, H., Leuteritz, T., Linden, S., Myroshnychenko, V., &#38; Förstner, J. (2022). Optimization of optical waveguide antennas for directive emission of light. <i>Journal of the Optical Society of America B</i>, <i>39</i>(1), 83. <a href=\"https://doi.org/10.1364/josab.438514\">https://doi.org/10.1364/josab.438514</a>","mla":"Farheen, Henna, et al. “Optimization of Optical Waveguide Antennas for Directive Emission of Light.” <i>Journal of the Optical Society of America B</i>, vol. 39, no. 1, 2022, p. 83, doi:<a href=\"https://doi.org/10.1364/josab.438514\">10.1364/josab.438514</a>.","short":"H. Farheen, T. Leuteritz, S. Linden, V. Myroshnychenko, J. Förstner, Journal of the Optical Society of America B 39 (2022) 83.","bibtex":"@article{Farheen_Leuteritz_Linden_Myroshnychenko_Förstner_2022, title={Optimization of optical waveguide antennas for directive emission of light}, volume={39}, DOI={<a href=\"https://doi.org/10.1364/josab.438514\">10.1364/josab.438514</a>}, number={1}, journal={Journal of the Optical Society of America B}, author={Farheen, Henna and Leuteritz, Till and Linden, Stefan and Myroshnychenko, Viktor and Förstner, Jens}, year={2022}, pages={83} }","ama":"Farheen H, Leuteritz T, Linden S, Myroshnychenko V, Förstner J. Optimization of optical waveguide antennas for directive emission of light. <i>Journal of the Optical Society of America B</i>. 2022;39(1):83. doi:<a href=\"https://doi.org/10.1364/josab.438514\">10.1364/josab.438514</a>","chicago":"Farheen, Henna, Till Leuteritz, Stefan Linden, Viktor Myroshnychenko, and Jens Förstner. “Optimization of Optical Waveguide Antennas for Directive Emission of Light.” <i>Journal of the Optical Society of America B</i> 39, no. 1 (2022): 83. <a href=\"https://doi.org/10.1364/josab.438514\">https://doi.org/10.1364/josab.438514</a>.","ieee":"H. Farheen, T. Leuteritz, S. Linden, V. Myroshnychenko, and J. Förstner, “Optimization of optical waveguide antennas for directive emission of light,” <i>Journal of the Optical Society of America B</i>, vol. 39, no. 1, p. 83, 2022, doi: <a href=\"https://doi.org/10.1364/josab.438514\">10.1364/josab.438514</a>."},"intvolume":"        39","page":"83","project":[{"grant_number":"231447078","_id":"53","name":"TRR 142"},{"_id":"56","name":"TRR 142 - Project Area C"},{"grant_number":"231447078","_id":"75","name":"TRR 142 - Subproject C5"},{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"_id":"28413","user_id":"158","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"file_date_updated":"2021-12-08T08:29:49Z","type":"journal_article","status":"public","date_created":"2021-12-08T07:14:39Z","title":"Optimization of optical waveguide antennas for directive emission of light","issue":"1","year":"2022","ddc":["530"],"keyword":["tet_topic_opticalantenna"],"language":[{"iso":"eng"}],"publication":"Journal of the Optical Society of America B","abstract":[{"text":"Optical traveling wave antennas offer unique opportunities to control and selectively guide light into a specific direction, which renders them excellent candidates for optical communication and sensing. These applications require state-of-the-art engineering to reach optimized functionalities such as high directivity and radiation efficiency, low sidelobe levels, broadband and tunable capabilities, and compact design. In this work, we report on the numerical optimization of the directivity of optical traveling wave antennas made from low-loss dielectric materials using full-wave numerical simulations in conjunction with the particle swarm optimization algorithm. The antennas are composed of a reflector and a director deposited on a glass substrate, and an emitter placed in the feed gap between them serves as an internal source of excitation. In particular, we analyze antennas with rectangular- and horn-shaped directors made of either hafnium dioxide or silicon. The optimized antennas produce highly directional emissions due to the presence of two dominant guided TE modes in the director in addition to leaky modes. These guided modes dominate the far-field emission pattern and govern the direction of the main lobe emission, which predominately originates from the end facet of the director. Our work also provides a comprehensive analysis of the modes, radiation patterns, parametric influences, and bandwidths of the antennas, which highlights their robust nature.","lang":"eng"}],"file":[{"relation":"main_file","content_type":"application/pdf","embargo_to":"open_access","access_level":"local","file_id":"28417","embargo":"2022-12-08","file_name":"2021-12 Farheen - JOSA B - Optimization of optical nanoantennas.pdf","file_size":14029741,"date_created":"2021-12-08T08:26:57Z","creator":"fossie","date_updated":"2021-12-08T08:26:57Z"},{"content_type":"application/pdf","relation":"supplementary_material","date_created":"2021-12-08T08:29:49Z","creator":"fossie","date_updated":"2021-12-08T08:29:49Z","file_id":"28418","file_name":"2021-12 Farheen - JOSA B - Optimization of optical nanoantennas SUPPLEMENTARY MATERIAL.pdf","access_level":"open_access","file_size":655495}]},{"keyword":["tet_topic_opticalantenna"],"language":[{"iso":"eng"}],"abstract":[{"text":"Highly directive antennas with the ability of shaping radiation patterns in desired directions are essential for efficient on-chip optical communication with reduced cross talk. In this paper, we design and optimize three distinct broadband traveling-wave tantalum pentoxide antennas exhibiting highly directional characteristics. Our antennas contain a director and reflector deposited on a glass substrate, which are excited by a dipole emitter placed in the feed gap between the two elements. Full-wave simulations in conjunction with global optimization provide structures with an enhanced linear directivity as high as 119 radiating in the substrate. The high directivity is a result of the interplay between two dominant TE modes and the leaky modes present in the antenna director. Furthermore, these low-loss dielectric antennas exhibit a near-unity radiation efficiency at the operational wavelength of 780 nm and maintain a broad bandwidth. Our numerical results are in good agreement with experimental measurements from the optimized antennas fabricated using a two-step electron-beam lithography, revealing the highly directive nature of our structures. We envision that our antenna designs can be conveniently adapted to other dielectric materials and prove instrumental for inter-chip optical communications and other on-chip applications.","lang":"eng"}],"publication":"Optics Express","title":"Broadband optical Ta2O5 antennas for directional emission of light","publisher":"Optica Publishing Group","date_created":"2022-05-18T16:39:17Z","year":"2022","issue":"11","_id":"31329","project":[{"_id":"75","name":"TRR 142 - C5: TRR 142 - Subproject C5","grant_number":"231447078"},{"_id":"52","name":"PC2: Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"department":[{"_id":"61"},{"_id":"230"},{"_id":"429"}],"user_id":"158","status":"public","type":"journal_article","doi":"10.1364/oe.455815","date_updated":"2024-07-22T07:44:58Z","volume":30,"author":[{"first_name":"Henna","orcid":"0000-0001-7730-3489","last_name":"Farheen","id":"53444","full_name":"Farheen, Henna"},{"first_name":"Lok-Yee","full_name":"Yan, Lok-Yee","last_name":"Yan"},{"full_name":"Quiring, Viktor","last_name":"Quiring","first_name":"Viktor"},{"orcid":"https://orcid.org/0000-0002-5693-3083","last_name":"Eigner","full_name":"Eigner, Christof","id":"13244","first_name":"Christof"},{"first_name":"Thomas","last_name":"Zentgraf","orcid":"0000-0002-8662-1101","full_name":"Zentgraf, Thomas","id":"30525"},{"first_name":"Stefan","full_name":"Linden, Stefan","last_name":"Linden"},{"first_name":"Jens","last_name":"Förstner","orcid":"0000-0001-7059-9862","id":"158","full_name":"Förstner, Jens"},{"id":"46371","full_name":"Myroshnychenko, Viktor","last_name":"Myroshnychenko","first_name":"Viktor"}],"page":"19288","intvolume":"        30","citation":{"apa":"Farheen, H., Yan, L.-Y., Quiring, V., Eigner, C., Zentgraf, T., Linden, S., Förstner, J., &#38; Myroshnychenko, V. (2022). Broadband optical Ta2O5 antennas for directional emission of light. <i>Optics Express</i>, <i>30</i>(11), 19288. <a href=\"https://doi.org/10.1364/oe.455815\">https://doi.org/10.1364/oe.455815</a>","mla":"Farheen, Henna, et al. “Broadband Optical Ta2O5 Antennas for Directional Emission of Light.” <i>Optics Express</i>, vol. 30, no. 11, Optica Publishing Group, 2022, p. 19288, doi:<a href=\"https://doi.org/10.1364/oe.455815\">10.1364/oe.455815</a>.","short":"H. Farheen, L.-Y. Yan, V. Quiring, C. Eigner, T. Zentgraf, S. Linden, J. Förstner, V. Myroshnychenko, Optics Express 30 (2022) 19288.","bibtex":"@article{Farheen_Yan_Quiring_Eigner_Zentgraf_Linden_Förstner_Myroshnychenko_2022, title={Broadband optical Ta2O5 antennas for directional emission of light}, volume={30}, DOI={<a href=\"https://doi.org/10.1364/oe.455815\">10.1364/oe.455815</a>}, number={11}, journal={Optics Express}, publisher={Optica Publishing Group}, author={Farheen, Henna and Yan, Lok-Yee and Quiring, Viktor and Eigner, Christof and Zentgraf, Thomas and Linden, Stefan and Förstner, Jens and Myroshnychenko, Viktor}, year={2022}, pages={19288} }","ama":"Farheen H, Yan L-Y, Quiring V, et al. Broadband optical Ta2O5 antennas for directional emission of light. <i>Optics Express</i>. 2022;30(11):19288. doi:<a href=\"https://doi.org/10.1364/oe.455815\">10.1364/oe.455815</a>","chicago":"Farheen, Henna, Lok-Yee Yan, Viktor Quiring, Christof Eigner, Thomas Zentgraf, Stefan Linden, Jens Förstner, and Viktor Myroshnychenko. “Broadband Optical Ta2O5 Antennas for Directional Emission of Light.” <i>Optics Express</i> 30, no. 11 (2022): 19288. <a href=\"https://doi.org/10.1364/oe.455815\">https://doi.org/10.1364/oe.455815</a>.","ieee":"H. Farheen <i>et al.</i>, “Broadband optical Ta2O5 antennas for directional emission of light,” <i>Optics Express</i>, vol. 30, no. 11, p. 19288, 2022, doi: <a href=\"https://doi.org/10.1364/oe.455815\">10.1364/oe.455815</a>."},"publication_identifier":{"issn":["1094-4087"]},"publication_status":"published"},{"year":"2021","issue":"10","title":"Dielectric travelling wave antennas for directional light emission","date_created":"2021-04-29T06:56:40Z","file":[{"content_type":"application/pdf","relation":"main_file","success":1,"creator":"fossie","date_created":"2021-04-29T06:59:39Z","date_updated":"2021-04-29T06:59:39Z","file_name":"2021-04 Leuteritz - Optics Express - Dielectric travelling wave antennas.pdf","access_level":"closed","file_id":"21822","file_size":7464073}],"abstract":[{"text":"We present a combined experimental and numerical study of the far-field emission properties of optical travelling wave antennas made from low-loss dielectric materials. The antennas considered here are composed of two simple building blocks, a director and a reflector, deposited on a glass substrate. Colloidal quantum dots placed in the feed gap between the two elements serve as internal light source. The emission profile of the antenna is mainly formed by the director while the reflector suppresses backward emission. Systematic studies of the director dimensions as well as variation of antenna material show that the effective refractive index of the director primarily governs the far-field emission pattern. Below cut off, i.e., if the director’s effective refractive index is smaller than the refractive index of the substrate, the main lobe results from leaky wave emission along the director. In contrast, if the director supports a guided mode, the emission predominately originates from the end facet of the director.","lang":"eng"}],"publication":"Optics Express","language":[{"iso":"eng"}],"ddc":["530"],"keyword":["tet_topic_opticalantenna"],"citation":{"short":"T. Leuteritz, H. Farheen, S. Qiao, F. Spreyer, C. Schlickriede, T. Zentgraf, V. Myroshnychenko, J. Förstner, S. Linden, Optics Express 29 (2021).","mla":"Leuteritz, T., et al. “Dielectric Travelling Wave Antennas for Directional Light Emission.” <i>Optics Express</i>, vol. 29, no. 10, 14694, 2021, doi:<a href=\"https://doi.org/10.1364/oe.422984\">10.1364/oe.422984</a>.","bibtex":"@article{Leuteritz_Farheen_Qiao_Spreyer_Schlickriede_Zentgraf_Myroshnychenko_Förstner_Linden_2021, title={Dielectric travelling wave antennas for directional light emission}, volume={29}, DOI={<a href=\"https://doi.org/10.1364/oe.422984\">10.1364/oe.422984</a>}, number={1014694}, journal={Optics Express}, author={Leuteritz, T. and Farheen, Henna and Qiao, S. and Spreyer, F. and Schlickriede, Christian and Zentgraf, Thomas and Myroshnychenko, Viktor and Förstner, Jens and Linden, S.}, year={2021} }","apa":"Leuteritz, T., Farheen, H., Qiao, S., Spreyer, F., Schlickriede, C., Zentgraf, T., Myroshnychenko, V., Förstner, J., &#38; Linden, S. (2021). Dielectric travelling wave antennas for directional light emission. <i>Optics Express</i>, <i>29</i>(10), Article 14694. <a href=\"https://doi.org/10.1364/oe.422984\">https://doi.org/10.1364/oe.422984</a>","chicago":"Leuteritz, T., Henna Farheen, S. Qiao, F. Spreyer, Christian Schlickriede, Thomas Zentgraf, Viktor Myroshnychenko, Jens Förstner, and S. Linden. “Dielectric Travelling Wave Antennas for Directional Light Emission.” <i>Optics Express</i> 29, no. 10 (2021). <a href=\"https://doi.org/10.1364/oe.422984\">https://doi.org/10.1364/oe.422984</a>.","ieee":"T. Leuteritz <i>et al.</i>, “Dielectric travelling wave antennas for directional light emission,” <i>Optics Express</i>, vol. 29, no. 10, Art. no. 14694, 2021, doi: <a href=\"https://doi.org/10.1364/oe.422984\">10.1364/oe.422984</a>.","ama":"Leuteritz T, Farheen H, Qiao S, et al. Dielectric travelling wave antennas for directional light emission. <i>Optics Express</i>. 2021;29(10). doi:<a href=\"https://doi.org/10.1364/oe.422984\">10.1364/oe.422984</a>"},"intvolume":"        29","publication_status":"published","publication_identifier":{"issn":["1094-4087"]},"has_accepted_license":"1","doi":"10.1364/oe.422984","author":[{"first_name":"T.","last_name":"Leuteritz","full_name":"Leuteritz, T."},{"last_name":"Farheen","orcid":"0000-0001-7730-3489","full_name":"Farheen, Henna","id":"53444","first_name":"Henna"},{"first_name":"S.","last_name":"Qiao","full_name":"Qiao, S."},{"first_name":"F.","full_name":"Spreyer, F.","last_name":"Spreyer"},{"first_name":"Christian","id":"59792","full_name":"Schlickriede, Christian","last_name":"Schlickriede"},{"first_name":"Thomas","full_name":"Zentgraf, Thomas","id":"30525","orcid":"0000-0002-8662-1101","last_name":"Zentgraf"},{"first_name":"Viktor","full_name":"Myroshnychenko, Viktor","id":"46371","last_name":"Myroshnychenko"},{"first_name":"Jens","orcid":"0000-0001-7059-9862","last_name":"Förstner","id":"158","full_name":"Förstner, Jens"},{"full_name":"Linden, S.","last_name":"Linden","first_name":"S."}],"volume":29,"date_updated":"2024-07-22T07:45:22Z","status":"public","type":"journal_article","file_date_updated":"2021-04-29T06:59:39Z","article_number":"14694","user_id":"158","department":[{"_id":"61"},{"_id":"230"},{"_id":"429"},{"_id":"15"},{"_id":"289"}],"project":[{"grant_number":"231447078","name":"TRR 142","_id":"53"},{"_id":"56","name":"TRR 142 - Project Area C"},{"_id":"75","name":"TRR 142 - Subproject C5","grant_number":"231447078"}],"_id":"21821"},{"intvolume":"       203","page":"116432","citation":{"mla":"Myroshnychenko, Viktor, et al. “Nonlinear Dielectric Properties of Random Paraelectric-Dielectric Composites.” <i>Acta Materialia</i>, vol. 203, 2020, p. 116432, doi:<a href=\"https://doi.org/10.1016/j.actamat.2020.10.051\">10.1016/j.actamat.2020.10.051</a>.","bibtex":"@article{Myroshnychenko_Smirnov_Jose_Brosseau_Förstner_2020, title={Nonlinear dielectric properties of random paraelectric-dielectric composites}, volume={203}, DOI={<a href=\"https://doi.org/10.1016/j.actamat.2020.10.051\">10.1016/j.actamat.2020.10.051</a>}, journal={Acta Materialia}, author={Myroshnychenko, Viktor and Smirnov, Stanislav and Jose, Pious Mathews Mulavarickal and Brosseau, Christian and Förstner, Jens}, year={2020}, pages={116432} }","short":"V. Myroshnychenko, S. Smirnov, P.M.M. Jose, C. Brosseau, J. Förstner, Acta Materialia 203 (2020) 116432.","apa":"Myroshnychenko, V., Smirnov, S., Jose, P. M. M., Brosseau, C., &#38; Förstner, J. (2020). Nonlinear dielectric properties of random paraelectric-dielectric composites. <i>Acta Materialia</i>, <i>203</i>, 116432. <a href=\"https://doi.org/10.1016/j.actamat.2020.10.051\">https://doi.org/10.1016/j.actamat.2020.10.051</a>","chicago":"Myroshnychenko, Viktor, Stanislav Smirnov, Pious Mathews Mulavarickal Jose, Christian Brosseau, and Jens Förstner. “Nonlinear Dielectric Properties of Random Paraelectric-Dielectric Composites.” <i>Acta Materialia</i> 203 (2020): 116432. <a href=\"https://doi.org/10.1016/j.actamat.2020.10.051\">https://doi.org/10.1016/j.actamat.2020.10.051</a>.","ieee":"V. Myroshnychenko, S. Smirnov, P. M. M. Jose, C. Brosseau, and J. Förstner, “Nonlinear dielectric properties of random paraelectric-dielectric composites,” <i>Acta Materialia</i>, vol. 203, p. 116432, 2020.","ama":"Myroshnychenko V, Smirnov S, Jose PMM, Brosseau C, Förstner J. Nonlinear dielectric properties of random paraelectric-dielectric composites. <i>Acta Materialia</i>. 2020;203:116432. doi:<a href=\"https://doi.org/10.1016/j.actamat.2020.10.051\">10.1016/j.actamat.2020.10.051</a>"},"has_accepted_license":"1","publication_identifier":{"issn":["1359-6454"]},"publication_status":"published","doi":"10.1016/j.actamat.2020.10.051","date_updated":"2022-01-06T06:54:24Z","oa":"1","volume":203,"author":[{"first_name":"Viktor","full_name":"Myroshnychenko, Viktor","id":"46371","last_name":"Myroshnychenko"},{"first_name":"Stanislav","last_name":"Smirnov","full_name":"Smirnov, Stanislav"},{"first_name":"Pious Mathews Mulavarickal","full_name":"Jose, Pious Mathews Mulavarickal","last_name":"Jose"},{"first_name":"Christian","full_name":"Brosseau, Christian","last_name":"Brosseau"},{"full_name":"Förstner, Jens","id":"158","last_name":"Förstner","orcid":"0000-0001-7059-9862","first_name":"Jens"}],"status":"public","type":"journal_article","file_date_updated":"2020-10-30T13:52:58Z","_id":"20233","project":[{"_id":"52","name":"Computing Resources Provided by the Paderborn Center for Parallel Computing"}],"department":[{"_id":"61"},{"_id":"230"}],"user_id":"158","year":"2020","title":"Nonlinear dielectric properties of random paraelectric-dielectric composites","date_created":"2020-10-30T13:51:42Z","abstract":[{"lang":"eng","text":"The challenge of designing new tunable nonlinear dielectric materials with tailored properties has attracted an increasing amount of interest recently. Herein, we study the effective nonlinear dielectric response of a stochastic paraelectric-dielectric composite consisting of equilibrium distributions of circular and partially penetrable disks (or parallel, infinitely long, identical, partially penetrable, circular cylinders) of a dielectric phase randomly dispersed in a continuous matrix of a paraelectric phase. The random microstructures were generated using the Metropolis Monte Carlo algorithm. The evaluation of the effective permittivity and tunability were carried out by employing either a Landau thermodynamic model or its Johnson’s approximation to describe the field-dependent permittivity of the paraelectric phase and solving continuum-electrostatics equations using finite element calculations. We reveal that the percolation threshold in this composite governs the critical behavior of the effective permittivity and tunability. For microstructures below the percolation threshold, our simulations demonstrate a strong nonlinear behaviour of the field-dependent effective permittivity and very high tunability that increases as a function of dielectric phase concentration. Above the percolation threshold, the effective permittivity shows the tendency to linearization and the tunability dramatically drops down. The highly reduced permittivity and extraordinarily high tunability are obtained for the composites with dielectric impenetrable disks at high concentrations, in which the triggering of the percolation transition is avoided. The reported results cast light on distinct nonlinear behaviour of 2D and 3D stochastic composites and can guide the design of novel composites with the controlled morphology and tailored permittivity and tunability."}],"file":[{"file_size":3934721,"title":"(Accepted Preprint)","access_level":"open_access","file_name":"2020-10 Myroshnychenko - Acta Material (accepted preprint)_compressed.pdf","file_id":"20234","date_updated":"2020-10-30T13:52:58Z","date_created":"2020-10-30T13:52:58Z","creator":"fossie","relation":"main_file","content_type":"application/pdf"}],"publication":"Acta Materialia","ddc":["530"],"language":[{"iso":"eng"}]},{"status":"public","urn":"41659","type":"journal_article","file_date_updated":"2018-09-03T13:54:21Z","article_type":"original","department":[{"_id":"61"},{"_id":"230"}],"user_id":"158","_id":"4165","project":[{"_id":"53","name":"TRR 142"},{"_id":"56","name":"TRR 142 - Project Area C"},{"_id":"75","name":"TRR 142 - Subproject C5"}],"intvolume":"        12","page":"8436-8446","citation":{"mla":"Myroshnychenko, Viktor, et al. “Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution.” <i>ACS Nano</i>, vol. 12, no. 8, American Chemical Society (ACS), 2018, pp. 8436–46, doi:<a href=\"https://doi.org/10.1021/acsnano.8b03926\">10.1021/acsnano.8b03926</a>.","bibtex":"@article{Myroshnychenko_Nishio_García de Abajo_Förstner_Yamamoto_2018, title={Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution}, volume={12}, DOI={<a href=\"https://doi.org/10.1021/acsnano.8b03926\">10.1021/acsnano.8b03926</a>}, number={8}, journal={ACS Nano}, publisher={American Chemical Society (ACS)}, author={Myroshnychenko, Viktor and Nishio, Natsuki and García de Abajo, F. Javier and Förstner, Jens and Yamamoto, Naoki}, year={2018}, pages={8436–8446} }","short":"V. Myroshnychenko, N. Nishio, F.J. García de Abajo, J. Förstner, N. Yamamoto, ACS Nano 12 (2018) 8436–8446.","apa":"Myroshnychenko, V., Nishio, N., García de Abajo, F. J., Förstner, J., &#38; Yamamoto, N. (2018). Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution. <i>ACS Nano</i>, <i>12</i>(8), 8436–8446. <a href=\"https://doi.org/10.1021/acsnano.8b03926\">https://doi.org/10.1021/acsnano.8b03926</a>","chicago":"Myroshnychenko, Viktor, Natsuki Nishio, F. Javier García de Abajo, Jens Förstner, and Naoki Yamamoto. “Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution.” <i>ACS Nano</i> 12, no. 8 (2018): 8436–46. <a href=\"https://doi.org/10.1021/acsnano.8b03926\">https://doi.org/10.1021/acsnano.8b03926</a>.","ieee":"V. Myroshnychenko, N. Nishio, F. J. García de Abajo, J. Förstner, and N. Yamamoto, “Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution,” <i>ACS Nano</i>, vol. 12, no. 8, pp. 8436–8446, 2018.","ama":"Myroshnychenko V, Nishio N, García de Abajo FJ, Förstner J, Yamamoto N. Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution. <i>ACS Nano</i>. 2018;12(8):8436-8446. doi:<a href=\"https://doi.org/10.1021/acsnano.8b03926\">10.1021/acsnano.8b03926</a>"},"publication_identifier":{"issn":["1936-0851","1936-086X"]},"has_accepted_license":"1","publication_status":"published","doi":"10.1021/acsnano.8b03926","volume":12,"author":[{"first_name":"Viktor","last_name":"Myroshnychenko","id":"46371","full_name":"Myroshnychenko, Viktor"},{"first_name":"Natsuki","last_name":"Nishio","full_name":"Nishio, Natsuki"},{"first_name":"F. Javier","last_name":"García de Abajo","full_name":"García de Abajo, F. Javier"},{"orcid":"0000-0001-7059-9862","last_name":"Förstner","id":"158","full_name":"Förstner, Jens","first_name":"Jens"},{"first_name":"Naoki","full_name":"Yamamoto, Naoki","last_name":"Yamamoto"}],"date_updated":"2022-01-06T07:00:27Z","oa":"1","file":[{"relation":"main_file","content_type":"application/pdf","file_size":4463352,"access_level":"open_access","file_id":"4166","file_name":"2018 Myroshnychenko,Nishio,Garcia de Abajo,Förstner,Yamamoto_Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution.pdf","date_updated":"2018-09-03T13:54:21Z","date_created":"2018-08-28T07:45:47Z","creator":"hclaudia"}],"abstract":[{"text":"Metal nanoparticles host localized plasmon excitations that allow the manipulation of optical fields at the nanoscale. Despite the availability of several techniques for imaging plasmons, direct access into the symmetries of these excitations remains elusive, thus hindering progress in the development of applications. Here, we present a combination of angle-, polarization-, and space-resolved cathodoluminescence spectroscopy methods to selectively access the symmetry and degeneracy of plasmonic states in lithographically fabricated gold nanoprisms. We experimentally reveal and spatially map degenerate states of multipole plasmon modes with nanometer spatial resolution and further provide recipes for resolving optically dark and out-of-plane modes. Full-wave simulations in conjunction with a simple tight-binding model explain the complex plasmon structure in these particles and reveal intriguing mode-symmetry phenomena. Our approach introduces systematics for a comprehensive symmetry characterization of plasmonic states in high-symmetry nanostructures.","lang":"eng"}],"publication":"ACS Nano","language":[{"iso":"eng"}],"keyword":["tet_topic_plasmonics"],"ddc":["530"],"year":"2018","issue":"8","title":"Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution","date_created":"2018-08-28T07:44:24Z","publisher":"American Chemical Society (ACS)"},{"publisher":"American Chemical Society (ACS)","date_created":"2018-08-13T09:32:56Z","title":"Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements","issue":"2","year":"2015","ddc":["530"],"keyword":["tet_topic_plasmonics"],"language":[{"iso":"eng"}],"publication":"Nano Letters","abstract":[{"text":"Plasmon modes of the exact same individual gold nanoprisms are investigated through combined nanometer-resolved electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) measurements. We show that CL only probes the radiative modes, in contrast to EELS, which additionally reveals dark modes. The combination of both techniques on the same particles thus provides complementary information and also demonstrates that although the radiative modes give rise to very similar spatial distributions when probed by EELS or CL, their resonant energies appear to be different. We trace this phenomenon back to plasmon dissipation, which affects in different ways the plasmon signatures probed by these techniques. Our experiments are in agreement with electromagnetic numerical simulations and can be further interpreted within the framework of a quasistatic analytical model. We therefore demonstrate that CL and EELS are closely related to optical scattering and extinction, respectively, with the addition of nanometer spatial resolution.","lang":"eng"}],"file":[{"creator":"hclaudia","date_created":"2018-08-13T09:35:36Z","date_updated":"2018-09-04T20:06:07Z","access_level":"open_access","file_name":"2015-01 Losquin et al_Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence MeasurementsNanoletters_EELS and CL .pdf","file_id":"3893","file_size":521343,"content_type":"application/pdf","relation":"main_file"}],"date_updated":"2022-01-06T06:59:50Z","oa":"1","author":[{"first_name":"Arthur","full_name":"Losquin, Arthur","last_name":"Losquin"},{"first_name":"Luiz F.","last_name":"Zagonel","full_name":"Zagonel, Luiz F."},{"first_name":"Viktor","full_name":"Myroshnychenko, Viktor","id":"46371","last_name":"Myroshnychenko"},{"first_name":"Benito","full_name":"Rodríguez-González, Benito","last_name":"Rodríguez-González"},{"full_name":"Tencé, Marcel","last_name":"Tencé","first_name":"Marcel"},{"full_name":"Scarabelli, Leonardo","last_name":"Scarabelli","first_name":"Leonardo"},{"full_name":"Förstner, Jens","id":"158","orcid":"0000-0001-7059-9862","last_name":"Förstner","first_name":"Jens"},{"first_name":"Luis M.","full_name":"Liz-Marzán, Luis M.","last_name":"Liz-Marzán"},{"first_name":"F. Javier","full_name":"García de Abajo, F. Javier","last_name":"García de Abajo"},{"last_name":"Stéphan","full_name":"Stéphan, Odile","first_name":"Odile"},{"first_name":"Mathieu","last_name":"Kociak","full_name":"Kociak, Mathieu"}],"volume":15,"doi":"10.1021/nl5043775","publication_status":"published","publication_identifier":{"issn":["1530-6984","1530-6992"]},"has_accepted_license":"1","citation":{"short":"A. Losquin, L.F. Zagonel, V. Myroshnychenko, B. Rodríguez-González, M. Tencé, L. Scarabelli, J. Förstner, L.M. Liz-Marzán, F.J. García de Abajo, O. Stéphan, M. Kociak, Nano Letters 15 (2015) 1229–1237.","bibtex":"@article{Losquin_Zagonel_Myroshnychenko_Rodríguez-González_Tencé_Scarabelli_Förstner_Liz-Marzán_García de Abajo_Stéphan_et al._2015, title={Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements}, volume={15}, DOI={<a href=\"https://doi.org/10.1021/nl5043775\">10.1021/nl5043775</a>}, number={2}, journal={Nano Letters}, publisher={American Chemical Society (ACS)}, author={Losquin, Arthur and Zagonel, Luiz F. and Myroshnychenko, Viktor and Rodríguez-González, Benito and Tencé, Marcel and Scarabelli, Leonardo and Förstner, Jens and Liz-Marzán, Luis M. and García de Abajo, F. Javier and Stéphan, Odile and et al.}, year={2015}, pages={1229–1237} }","mla":"Losquin, Arthur, et al. “Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements.” <i>Nano Letters</i>, vol. 15, no. 2, American Chemical Society (ACS), 2015, pp. 1229–37, doi:<a href=\"https://doi.org/10.1021/nl5043775\">10.1021/nl5043775</a>.","apa":"Losquin, A., Zagonel, L. F., Myroshnychenko, V., Rodríguez-González, B., Tencé, M., Scarabelli, L., … Kociak, M. (2015). Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements. <i>Nano Letters</i>, <i>15</i>(2), 1229–1237. <a href=\"https://doi.org/10.1021/nl5043775\">https://doi.org/10.1021/nl5043775</a>","ama":"Losquin A, Zagonel LF, Myroshnychenko V, et al. Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements. <i>Nano Letters</i>. 2015;15(2):1229-1237. doi:<a href=\"https://doi.org/10.1021/nl5043775\">10.1021/nl5043775</a>","ieee":"A. Losquin <i>et al.</i>, “Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements,” <i>Nano Letters</i>, vol. 15, no. 2, pp. 1229–1237, 2015.","chicago":"Losquin, Arthur, Luiz F. Zagonel, Viktor Myroshnychenko, Benito Rodríguez-González, Marcel Tencé, Leonardo Scarabelli, Jens Förstner, et al. “Unveiling Nanometer Scale Extinction and Scattering Phenomena through Combined Electron Energy Loss Spectroscopy and Cathodoluminescence Measurements.” <i>Nano Letters</i> 15, no. 2 (2015): 1229–37. <a href=\"https://doi.org/10.1021/nl5043775\">https://doi.org/10.1021/nl5043775</a>."},"intvolume":"        15","page":"1229-1237","_id":"3892","user_id":"158","department":[{"_id":"61"}],"article_type":"original","file_date_updated":"2018-09-04T20:06:07Z","type":"journal_article","urn":"38927","status":"public"},{"type":"journal_article","status":"public","_id":"4409","department":[{"_id":"61"}],"user_id":"55706","article_number":"125144","article_type":"original","file_date_updated":"2018-09-17T08:50:03Z","publication_identifier":{"issn":["1098-0121","1550-235X"]},"has_accepted_license":"1","publication_status":"published","intvolume":"        91","citation":{"short":"N. Yamamoto, F. Javier García de Abajo, V. Myroshnychenko, Physical Review B 91 (2015).","bibtex":"@article{Yamamoto_Javier García de Abajo_Myroshnychenko_2015, title={Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy}, volume={91}, DOI={<a href=\"https://doi.org/10.1103/physrevb.91.125144\">10.1103/physrevb.91.125144</a>}, number={12125144}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Yamamoto, Naoki and Javier García de Abajo, F. and Myroshnychenko, Viktor}, year={2015} }","mla":"Yamamoto, Naoki, et al. “Interference of Surface Plasmons and Smith-Purcell Emission Probed by Angle-Resolved Cathodoluminescence Spectroscopy.” <i>Physical Review B</i>, vol. 91, no. 12, 125144, American Physical Society (APS), 2015, doi:<a href=\"https://doi.org/10.1103/physrevb.91.125144\">10.1103/physrevb.91.125144</a>.","apa":"Yamamoto, N., Javier García de Abajo, F., &#38; Myroshnychenko, V. (2015). Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy. <i>Physical Review B</i>, <i>91</i>(12). <a href=\"https://doi.org/10.1103/physrevb.91.125144\">https://doi.org/10.1103/physrevb.91.125144</a>","ieee":"N. Yamamoto, F. Javier García de Abajo, and V. Myroshnychenko, “Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy,” <i>Physical Review B</i>, vol. 91, no. 12, 2015.","chicago":"Yamamoto, Naoki, F. Javier García de Abajo, and Viktor Myroshnychenko. “Interference of Surface Plasmons and Smith-Purcell Emission Probed by Angle-Resolved Cathodoluminescence Spectroscopy.” <i>Physical Review B</i> 91, no. 12 (2015). <a href=\"https://doi.org/10.1103/physrevb.91.125144\">https://doi.org/10.1103/physrevb.91.125144</a>.","ama":"Yamamoto N, Javier García de Abajo F, Myroshnychenko V. Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy. <i>Physical Review B</i>. 2015;91(12). doi:<a href=\"https://doi.org/10.1103/physrevb.91.125144\">10.1103/physrevb.91.125144</a>"},"date_updated":"2022-01-06T07:01:02Z","volume":91,"author":[{"last_name":"Yamamoto","full_name":"Yamamoto, Naoki","first_name":"Naoki"},{"first_name":"F.","last_name":"Javier García de Abajo","full_name":"Javier García de Abajo, F."},{"first_name":"Viktor","id":"46371","full_name":"Myroshnychenko, Viktor","last_name":"Myroshnychenko"}],"doi":"10.1103/physrevb.91.125144","publication":"Physical Review B","abstract":[{"text":"We investigate the interplay between geometrical lattice resonances and surface plasmons mediating the\r\nemission of Smith-Purcell visible light via angle-resolved cathodoluminescence spectroscopy. We observe\r\nstrong modulations in the dispersion curves of Smith-Purcell radiation (SPR) when they intersect the surface\r\nplasmons of silver gratings using a 200-kV transmission electron microscope. The decay of the plasmons away\r\nfrom the grating is directly probed by controlling the electron-beam position relative to the sample surface\r\nwith nanometer precision. Our measurements are in excellent agreement with numerical simulations, clearly\r\nrevealing the presence of characteristic Fano profiles resulting from the interference of the light continuum\r\nand the discrete plasmon states for each direction of emission. The intensity anomaly in the SPR emission\r\npattern can be well explained from the geometrical consideration of the intersections between the dispersion\r\nplanes of the SPR and surface plasmon polariton (SPP). A strong and directional SPR beam can be realized\r\nunder the condition that the SPR dispersion plane comes in contact with the band edge of the SPP dispersion\r\nplane.","lang":"eng"}],"file":[{"relation":"main_file","success":1,"content_type":"application/pdf","access_level":"closed","file_name":"Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy_2015.pdf","file_id":"4410","file_size":2473173,"date_created":"2018-09-17T08:50:03Z","creator":"hclaudia","date_updated":"2018-09-17T08:50:03Z"}],"ddc":["530"],"language":[{"iso":"eng"}],"issue":"12","year":"2015","publisher":"American Physical Society (APS)","date_created":"2018-09-17T08:48:52Z","title":"Interference of surface plasmons and Smith-Purcell emission probed by angle-resolved cathodoluminescence spectroscopy"}]