Metasurface and its design method for near-field structured color display and holographic multiplexing

A design method and technology of structural color, applied in the field of micro-nano optics, can solve the problems of difficult integration of different types of functions on metasurfaces, low tolerance of processing errors, and large crosstalk in multi-channel work, achieving high image quality and simple design process. , reconstruct high-quality effects

Active Publication Date: 2022-01-04
WUHAN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The present invention provides a metasurface and its design method for realizing near-field structural color display and holographic multiplexing, so as to solve the problems in the prior art that metasurfaces are difficult to integrate different types of functions, have large multi-channel work crosstalk, complex design process, and low processing error tolerance The problem

Method used

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  • Metasurface and its design method for near-field structured color display and holographic multiplexing
  • Metasurface and its design method for near-field structured color display and holographic multiplexing
  • Metasurface and its design method for near-field structured color display and holographic multiplexing

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Embodiment 1

[0048] Embodiment 1 provides a metasurface that realizes near-field structural color display and holographic multiplexing. The metasurface is composed of several nano-brick structural units; nano bricks.

[0049]The direction of the two sides parallel to the working surface of the base is respectively set as the x-axis and the y-axis to establish an xoy coordinate system, the nano-brick is a cuboid structure, and the long axis and short axis of the nano-brick are all in line with the The working surfaces of the base are parallel, and the steering angle of the nano-bricks is the angle between the long axis of the nano-bricks and the x-axis.

[0050] Different groups of nano-brick structural units correspond to different size parameters of the long axis or short axis of nano-bricks, and different groups of nano-brick structural units correspond to the same height and size of nano-bricks; different groups of nano-brick structural units under white light incident With different r...

Embodiment 2

[0055] Embodiment 2 provides a method for designing a metasurface that realizes near-field structural color display and holographic multiplexing as described in Embodiment 1, mainly including the following steps:

[0056] Optimize the design of multiple groups of nano-brick structural units, so that multiple groups of nano-brick structural units have different reflection spectral responses under white light incidence; design near-field structural color display images, and combine each of the nano-brick unit structures As a pixel unit, a variety of nano-brick structural units are arranged according to the color of the near-field structural color display image; the far-field holographic image is designed, and the steering angle of each nano-brick is adjusted according to the complex amplitude distribution calculated by the far-field holographic image. Arrangement is performed to obtain a metasurface.

[0057] Among them, when optimizing the design of multiple groups of nano-bric...

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Abstract

The invention belongs to the technical field of micro-nano optics, and discloses a metasurface and a design method thereof for realizing near-field structural color display and holographic multiplexing. The metasurface is composed of several nano-brick structural units, and the nano-brick structural units include substrates and nano-bricks; different groups of nano-brick structural units have different reflection spectral responses under white light incidence, and present different structural colors; each nano-brick The unit structure is used as a pixel unit, and multiple groups of nano-brick structural units are arranged according to the color of the near-field structural color display image; the steering angle of each nano-brick is calculated according to the complex amplitude distribution calculated by the far-field holographic image. Arrangement: When non-polarized white light is incident on the metasurface, the reflected light displays a near-field structural color display image on the plane where the metasurface is located; when circularly polarized light is incident on the metasurface, the transmitted light displays far-field holography in the Fraunhofer diffraction zone image. The invention can realize near-field structural color display and far-field holographic multiplexing through a piece of metasurface.

Description

technical field [0001] The invention belongs to the field of micro-nano optics technology, and more specifically relates to a metasurface and a design method thereof for realizing near-field structural color display and holographic multiplexing. Background technique [0002] There are two main colors of objects in nature: pigmented color and structural color. Pigment color is the color that is intuitively presented after a single substance absorbs or reflects light, while structural color is a variety of colors produced by a large number of ordered structures that scatter, diffract or interfere with light of different wavelengths. Structural color, also known as physical color, is a color caused by the wavelength of light. It is a variety of colors produced by refraction, diffuse reflection, diffraction or interference of light waves due to fine structures. Structural color is a color expression method without pigment. It has the characteristics of high saturation, never fa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/00G02B5/32G02B27/00G02B1/00
CPCG02B5/00G02B5/32G02B27/0012G02B1/002
Inventor 梁聪玲郑国兴
Owner WUHAN UNIV
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