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Spin-controlled wavefront shaping with plasmonic chiral geometric metasurfaces

Metasurfaces, as a two-dimensional (2D) version of metamaterials, have drawn considerable attention for their revolutionary capability in manipulating the amplitude, phase, and polarization of light. As one of the most important types of metasurfaces, geometric metasurfaces provide a versatile platf...

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Autores principales: Chen, Yang, Yang, Xiaodong, Gao, Jie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6207568/
https://www.ncbi.nlm.nih.gov/pubmed/30393537
http://dx.doi.org/10.1038/s41377-018-0086-x
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author Chen, Yang
Yang, Xiaodong
Gao, Jie
author_facet Chen, Yang
Yang, Xiaodong
Gao, Jie
author_sort Chen, Yang
collection PubMed
description Metasurfaces, as a two-dimensional (2D) version of metamaterials, have drawn considerable attention for their revolutionary capability in manipulating the amplitude, phase, and polarization of light. As one of the most important types of metasurfaces, geometric metasurfaces provide a versatile platform for controlling optical phase distributions due to the geometric nature of the generated phase profile. However, it remains a great challenge to design geometric metasurfaces for realizing spin-switchable functionalities because the generated phase profile with the converted spin is reversed once the handedness of the incident beam is switched. Here, we propose and experimentally demonstrate chiral geometric metasurfaces based on intrinsically chiral plasmonic stepped nanoapertures with a simultaneously high circular dichroism in transmission (CDT) and large cross-polarization ratio (CPR) in transmitted light to exhibit spin-controlled wavefront shaping capabilities. The chiral geometric metasurfaces are constructed by merging two independently designed subarrays of the two enantiomers for the stepped nanoaperture. Under a certain incident handedness, the transmission from one subarray is allowed, while the transmission from the other subarray is strongly prohibited. The merged metasurface then only exhibits the transmitted signal with the phase profile of one subarray, which can be switched by changing the incident handedness. Based on the chiral geometric metasurface, both chiral metasurface holograms and the spin-dependent generation of hybrid-order Poincaré sphere beams are experimentally realized. Our approach promises further applications in spin-controlled metasurface devices for complex beam conversion, image processing, optical trapping, and optical communications.
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spelling pubmed-62075682018-11-02 Spin-controlled wavefront shaping with plasmonic chiral geometric metasurfaces Chen, Yang Yang, Xiaodong Gao, Jie Light Sci Appl Article Metasurfaces, as a two-dimensional (2D) version of metamaterials, have drawn considerable attention for their revolutionary capability in manipulating the amplitude, phase, and polarization of light. As one of the most important types of metasurfaces, geometric metasurfaces provide a versatile platform for controlling optical phase distributions due to the geometric nature of the generated phase profile. However, it remains a great challenge to design geometric metasurfaces for realizing spin-switchable functionalities because the generated phase profile with the converted spin is reversed once the handedness of the incident beam is switched. Here, we propose and experimentally demonstrate chiral geometric metasurfaces based on intrinsically chiral plasmonic stepped nanoapertures with a simultaneously high circular dichroism in transmission (CDT) and large cross-polarization ratio (CPR) in transmitted light to exhibit spin-controlled wavefront shaping capabilities. The chiral geometric metasurfaces are constructed by merging two independently designed subarrays of the two enantiomers for the stepped nanoaperture. Under a certain incident handedness, the transmission from one subarray is allowed, while the transmission from the other subarray is strongly prohibited. The merged metasurface then only exhibits the transmitted signal with the phase profile of one subarray, which can be switched by changing the incident handedness. Based on the chiral geometric metasurface, both chiral metasurface holograms and the spin-dependent generation of hybrid-order Poincaré sphere beams are experimentally realized. Our approach promises further applications in spin-controlled metasurface devices for complex beam conversion, image processing, optical trapping, and optical communications. Nature Publishing Group UK 2018-10-31 /pmc/articles/PMC6207568/ /pubmed/30393537 http://dx.doi.org/10.1038/s41377-018-0086-x Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Chen, Yang
Yang, Xiaodong
Gao, Jie
Spin-controlled wavefront shaping with plasmonic chiral geometric metasurfaces
title Spin-controlled wavefront shaping with plasmonic chiral geometric metasurfaces
title_full Spin-controlled wavefront shaping with plasmonic chiral geometric metasurfaces
title_fullStr Spin-controlled wavefront shaping with plasmonic chiral geometric metasurfaces
title_full_unstemmed Spin-controlled wavefront shaping with plasmonic chiral geometric metasurfaces
title_short Spin-controlled wavefront shaping with plasmonic chiral geometric metasurfaces
title_sort spin-controlled wavefront shaping with plasmonic chiral geometric metasurfaces
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6207568/
https://www.ncbi.nlm.nih.gov/pubmed/30393537
http://dx.doi.org/10.1038/s41377-018-0086-x
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