Dual-mode metasurface based on SOI material and dual-mode display application of dual-mode metasurface

Abstract

The invention discloses a dual-mode metasurface based on an SOI material. Geometrical parameters of a nanometer brick structure of the metasurface are designed so that one structure represents functions of a polarizer or a half-wave plate corresponding to different wavelengths. The metasurface is composed of a silicon nanometer brick array, a fused quartz dielectric layer and a silicon substrate layer. Based on the function, near-field continuous grayscale image display for the polarizer and far-field two-step Fourier holographic imaging for the half-wave plate can be designed by combining light wave intensity and phase modulation effects of the polarizer and the half-wave plate, the two imaging modes do not influence each other, and the dual-mode metasurface and application thereof can beapplied to the fields of polarization display, encryption, counterfeiting prevention and the like.

Description

technical field

[0001] The invention relates to the field of micro-nano optics, in particular to a dual-mode metasurface designed based on SOI material, which simultaneously realizes the functions of a polarizer and a half-wave plate and is used for dual-mode display applications. Background technique

[0002] As a new type of optical material, metasurfaces are composed of subwavelength structural antennas, and have some extraordinary physical properties that natural materials do not have. By rationally designing the geometry and size parameters of the metasurface unit structure, functions such as amplitude and phase modulation, polarization control, and filtering of light waves can be realized. At present, optical devices based on metasurfaces have been extensively studied, but are limited to the fine geometric structures of metasurfaces. Most metasurfaces are limited to scientific research and are difficult to put into mass production and application. Therefore, there is ...

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