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Metasurface structure design method realizing multi-dimensional optically manipulative image transformation

A structural design and metasurface technology, applied in optics, optical components, instruments, etc., can solve the problems of inability to transform images, reduce image quality, and inability to use other polarization state adjustments, so as to increase the security of encryption and increase the difficulty of decryption Effect

Inactive Publication Date: 2019-08-16
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this design method has the following disadvantages: (1) It is impossible to use the incident angle to transform the image; (2) It can only realize the transformation of two images through linearly polarized light, but cannot use other polarization states to adjust; (3) Use The image conversion of the incident wavelength will cause crosstalk between different wavelengths, which will degrade the image quality
These shortcomings greatly limit the application of metasurfaces in image transformation

Method used

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  • Metasurface structure design method realizing multi-dimensional optically manipulative image transformation
  • Metasurface structure design method realizing multi-dimensional optically manipulative image transformation
  • Metasurface structure design method realizing multi-dimensional optically manipulative image transformation

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Embodiment 1

[0035] The present invention provides a metasurface structure design method for realizing multi-dimensional light manipulation image transformation, which includes the following steps:

[0036] S1: Construct a super-surface structure composed of structural units on a transparent substrate, and coherent interference between the structural units forms a pixel of the super-surface structure;

[0037] S2: For the corner The structural unit is determined by the transmission coefficient a of the long axis direction of the structural unit x And the short axis transmission coefficient a y Get its Jones matrix J; according to the polarization state acting on the structural unit is σ

[0038] Based on the Jones matrix J of the structural unit, the scattering factor of the incident light is obtained as

[0039]

[0040] Any polarization state can be represented by different σ values, σ=+i represents right-handed light, σ=-i represents left-handed light, σ=0 represents the polarization in the x d...

Embodiment 2

[0061] Such as figure 1 As shown, this embodiment provides the simplest schematic diagram of the transformation between two single-bit images. The pixels in each image have only two intensities of 1 and 0, and the corresponding light incident parameter is determined by (θ 1 ,σ 1 ,λ 1 ) Becomes (θ 2 ,σ 2 ,λ 2 ), the image changes from number 23 to number 45. In this case, only two silicon nanorods need to be included in a pixel to achieve pixel conversion.

[0062] In the actual structure, in order to construct a square pixel, 2 silicon nanorods are copied to form a pixel composed of 4 nanorods. In order to achieve this transformation, four types of pixels are needed, 11, 01, 10, 00, where the first number represents the intensity before the transformation, and the latter number represents the intensity after the transformation. In this embodiment, a single parameter such as the angle of incidence is implemented to adjust the image transformation, and the angle of incidence is θ r...

Embodiment 3

[0066] In this embodiment, the three parameters of incident light, the angle of incidence, wavelength and polarization, are used to transform the image at the same time.

[0067] The number of transformed images is still 2, and the incident light parameters are respectively θ 1 =22°,σ 1 =+i,λ 1 =488nm and θ 2 =28°,σ 2 =-i,λ 2 =785nm. The geometric parameters of the silicon nanorods in the four pixels of 11, 01, 10, and 00 required for the transformation are (0.73μm, 79°), (1.1μm, 118°), (1.1μm, 28°) and (0.73 μm, 168.8°), the first parameter in the brackets is the distance between the two nanorods, and the latter parameter is the rotation angle difference between the two nanorods. Under these two different incident light parameters, the metasurface structure has changed from a two-dimensional code (SPE) to another two-dimensional code (SYSU), such as Figure 4 Shown.

[0068] Since the two-dimensional code only contains black and white elements, it is very suitable for adopting th...

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Abstract

The present invention relates to the technical field of optical devices based on an artificial metasurface structure, more specifically, the invention relates to a metasurface structure design methodrealizing multi-dimensional optically manipulative image transformation. A metasurface structure composed of structural units is constructed on a transparent substrate; pixels of the metasurface structure are formed by the coherent interference among the structural units; a Jones matrix J is obtained for the structural unit with a rotation angle of phi; according to the incident light acting on the structural unit, a scattering factor of the incident light is obtained on the basis of the Jones matrix J of the structural unit; considering the pixels composed of the n structural units, when theincident light is incident on the transparent substrate at the incident angle theta, the wavelength lambda and the polarization state sigma, the intensity of the pixels of the metasurface is formed bythe coherent interference of all the structural units; and the multi-dimensional optically manipulative image transformation function of the metasurface structure is realized. The invention can realize the image transformation with any multi-dimensional optical parameters and solves the image crosstalk problem.

Description

Technical field [0001] The invention relates to the technical field of optical devices based on artificial super-surface structures, and more specifically, to a super-surface structure design method for realizing multi-dimensional light manipulation image transformation. Background technique [0002] A metasurface is a planar structure composed of cells with special electromagnetic properties in a certain arrangement, and has a sub-wavelength thickness. It is usually formed by periodic arrangement of optical resonance units of different geometric sizes. By appropriately selecting the geometric parameters of each unit, the amplitude, phase, and polarization of electromagnetic waves can be arbitrarily controlled on the sub-wavelength scale. Therefore, it not only has the ability to control electromagnetic waves flexibly, but also because of its ultra-thin thickness, which greatly reduces the processing difficulty and the loss in light propagation, making the metastructure surface a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00G02B5/00G02B5/30G02B27/00
CPCG02B1/002G02B5/00G02B5/30G02B27/0012
Inventor 包燕军周张凯虞应
Owner SUN YAT SEN UNIV
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