Polarization and Holography Recording in Real‐ and k‐Space Based on Dielectric Metasurface

The diverse design freedom and mechanisms of metasurfaces motivate the manipulation of polarization in an ultrashort distance with subwavelength resolution and make metasurfaces outperform conventional polarization optical elements. However, in order to enhance the information capability and encrypt...

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Bibliographic Details
Published in:Advanced functional materials 2021-07, Vol.31 (27), p.n/a
Main Authors: Zhao, Ruizhe, Xiao, Xiaofei, Geng, Guangzhou, Li, Xin, Li, Junjie, Li, Xiaowei, Wang, Yongtian, Huang, Lingling
Format: Article
Language:English
Subjects:
Dielectrics
Holography
image encoding
Image reconstruction
Materials science
Metasurfaces
Multiplexing
Optical components
Optical polarization
Security
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Summary:The diverse design freedom and mechanisms of metasurfaces motivate the manipulation of polarization in an ultrashort distance with subwavelength resolution and make metasurfaces outperform conventional polarization optical elements. However, in order to enhance the information capability and encryption security of metasurface holograms, polarization manipulation together with multiplexing technologies are still highly desired. Here, a birefringent dielectric metasurface with the capability of encoding a grayscale image in real‐space based on Malus's law by utilizing the inhomogeneous polarization distribution and realizing the reconstruction of a vectorial holographic image in k‐space with the help of the phase profiles of different polarization components of output light is demonstrated. This novel functionality is realized by exploiting the manipulation of polarization and phase of output light simultaneously offered by the dielectric metasurface. The proposed method may enhance the information capability and security level of applications such as the anticounterfeiting and encryption. A dielectric metasurface composed of amorphous silicon nanofins is proposed with the capability of encoding a grayscale image in real‐space and realizing the reconstruction of a vectorial holographic image in k‐space. The proposed scheme not only increases the information capability of a metasurface hologram but also provides a platform for realizing multidimensional optical information encryption and anticounterfeiting with enhanced security.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202100406