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Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting

Metasurfaces attracted extensive interests due to their outstanding ability to manipulate the wavefront at a subwavelength scale. In this study, we demonstrated quasi-freeform metasurfaces in which the radius, location, and height of the nanocylinder building blocks were set as optimized structure p...

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Detalles Bibliográficos
Autores principales: Zhang, Qiuyu, Liu, Dingquan, Zhou, Sheng, Chen, Gang, Su, Junli, Sun, Leihao, Xiong, Yunbo, Li, Xingyu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10097112/
https://www.ncbi.nlm.nih.gov/pubmed/37049250
http://dx.doi.org/10.3390/nano13071156
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author Zhang, Qiuyu
Liu, Dingquan
Zhou, Sheng
Chen, Gang
Su, Junli
Sun, Leihao
Xiong, Yunbo
Li, Xingyu
author_facet Zhang, Qiuyu
Liu, Dingquan
Zhou, Sheng
Chen, Gang
Su, Junli
Sun, Leihao
Xiong, Yunbo
Li, Xingyu
author_sort Zhang, Qiuyu
collection PubMed
description Metasurfaces attracted extensive interests due to their outstanding ability to manipulate the wavefront at a subwavelength scale. In this study, we demonstrated quasi-freeform metasurfaces in which the radius, location, and height of the nanocylinder building blocks were set as optimized structure parameters, providing more degrees of freedom compared with traditional gradient metasurfaces. Given a desired wavefront shaping objective, these structure parameters can be collectively optimized utilizing a hybrid optimized algorithm. To demonstrate the versatility and feasibility of our method, we firstly proposed metasurfaces with deflecting efficiencies ranging from 86.2% to 94.8%, where the deflecting angles can vary in the range of 29°–75.6°. With further study, we applied our concept to realize a variety of high-efficiency, wide-angle, equal-power beam splitters. The total splitting efficiencies of all the proposed beam splitters exceeded 89.4%, where a highest efficiency of 97.6%, a maximum splitting angle of 75.6°, and a splitting uniformity of 0.33% were obtained. Considering that various deflecting angles, and various splitting channels with different splitting angles, can be realized by setting the optical response of metasurfaces as the optimization target, we believe that our method will provide an alternative approach for metasurfaces to realize desired wavefront shaping.
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spelling pubmed-100971122023-04-13 Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting Zhang, Qiuyu Liu, Dingquan Zhou, Sheng Chen, Gang Su, Junli Sun, Leihao Xiong, Yunbo Li, Xingyu Nanomaterials (Basel) Article Metasurfaces attracted extensive interests due to their outstanding ability to manipulate the wavefront at a subwavelength scale. In this study, we demonstrated quasi-freeform metasurfaces in which the radius, location, and height of the nanocylinder building blocks were set as optimized structure parameters, providing more degrees of freedom compared with traditional gradient metasurfaces. Given a desired wavefront shaping objective, these structure parameters can be collectively optimized utilizing a hybrid optimized algorithm. To demonstrate the versatility and feasibility of our method, we firstly proposed metasurfaces with deflecting efficiencies ranging from 86.2% to 94.8%, where the deflecting angles can vary in the range of 29°–75.6°. With further study, we applied our concept to realize a variety of high-efficiency, wide-angle, equal-power beam splitters. The total splitting efficiencies of all the proposed beam splitters exceeded 89.4%, where a highest efficiency of 97.6%, a maximum splitting angle of 75.6°, and a splitting uniformity of 0.33% were obtained. Considering that various deflecting angles, and various splitting channels with different splitting angles, can be realized by setting the optical response of metasurfaces as the optimization target, we believe that our method will provide an alternative approach for metasurfaces to realize desired wavefront shaping. MDPI 2023-03-24 /pmc/articles/PMC10097112/ /pubmed/37049250 http://dx.doi.org/10.3390/nano13071156 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhang, Qiuyu
Liu, Dingquan
Zhou, Sheng
Chen, Gang
Su, Junli
Sun, Leihao
Xiong, Yunbo
Li, Xingyu
Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting
title Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting
title_full Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting
title_fullStr Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting
title_full_unstemmed Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting
title_short Quasi-Freeform Metasurfaces for Wide-Angle Beam Deflecting and Splitting
title_sort quasi-freeform metasurfaces for wide-angle beam deflecting and splitting
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10097112/
https://www.ncbi.nlm.nih.gov/pubmed/37049250
http://dx.doi.org/10.3390/nano13071156
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