Polarization multiplexing holographic imaging method based on transmission type all-medium metasurface

A technology of polarization multiplexing and holographic imaging, which is applied in the field of polarization optics, optical holography, and micro-nano optics. It can solve the problems of increased processing difficulty, narrow response bandwidth, limited crystal types and sizes, etc., and achieves good processing error tolerance. , high stability and reliability, good clarity effect

CN108803292AActive Publication Date: 2018-11-13UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-11-13

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Abstract

The invention belongs to the technical field of micro-nano optics, polarization optics and optical holographic, and discloses a polarization multiplexing holographic imaging method based on a transmission type all-medium metasurface. A response main wavelength <lambda> is determined; geometric parameters of a unit structure are determined; a GS phase recovery algorithm is adopted to obtain phase distribution of the unit structure responding to the main wavelength; the pixel point of each element is expanded into a 2*2 array by adopting a Dammann grating method, and the obtained each pixel unitcomprises information responding to horizontal polarized light and information responding to vertical polarized light; and a synthesized silicon nano-antenna array is irradiated by horizontal polarized light and vertical polarized light with the wavelength of <lambda>, and different holographic images are reconstructed. According to the method, phase modulation of 0-2 <pi> can be realized only bychanging the size of the short axis of the silicon nano-antenna, and an embossment phase modulation structure of any step number can be realized equivalently; and a simple process, high processing error tolerance and quite high stability and reliability are achieved.
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Description

technical field

[0001] The invention belongs to the technical fields of micro-nano optics, polarization optics and optical holography, and in particular relates to a polarization multiplexing holographic imaging method based on a transmissive all-dielectric metasurface. Background technique

[0002] At present, the existing technologies commonly used in the industry are as follows: Polarization multiplexing holographic elements are very sensitive to the polarization characteristics of incident light, and can reproduce different holographic patterns by different polarization directions of incident light fields, so as to realize various applications, such as image processing, polarization detection, information storage, optical encryption etc. The traditional fabrication of polarization holographic elements is mainly based on the birefringence characteristics of natural materials or the effective birefringence characteristics achieved by etching sub-wavelength periodic struct...

Examples

Embodiment Construction

[0041]In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0042] The polarization holographic element obtained by the invention is flexible in design, and the transmission type all-dielectric metasurface polarization holographic element with any working wavelength can be realized by changing the geometric parameters of the silicon nano-antenna array.

[0043] The application principle of the present invention will be further described below in conjunction with the accompanying drawings.

[0044] The present invention utilizes silicon nano-antenna array to construct the implementation process of polarization holographic element, including:

[0045] The first step is to determine th...