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Cross polarization conversion optical device and its design method

A technology of cross polarization and optical devices, applied in the field of optics, can solve the problems of simple structure and high polarization conversion efficiency, and achieve the effect of low cost and high polarization conversion efficiency

Active Publication Date: 2019-12-27
CAPITAL NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the fact that the existing cross-polarization conversion optical device cannot achieve the effects of simple structure and high polarization conversion efficiency at the same time, thereby providing a cross-polarization conversion optical device and its design method

Method used

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  • Cross polarization conversion optical device and its design method
  • Cross polarization conversion optical device and its design method

Examples

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no. 1 example

[0055] Such as figure 1 Shown is a partial structural schematic diagram of the cross-polarization conversion optical device according to the first embodiment of the present invention. The cross-polarization conversion optical device has a double-layer metasurface structure, which can be used to achieve full-band beam shaping effects. Such as figure 1 As shown in , the cross polarization conversion optical device is a flat plate structure, including: a "C" structure metal layer 11, a dielectric layer 12 and a metal grating layer 13.

[0056] The "C" structure metal layer 11 can be a good conductor, such as gold, silver, copper, aluminum and other precious metals. The "C" structure metal layer 11 includes a plurality of "C" structural units, and the multiple "C" structural units array arrangement.

[0057] In the first embodiment of the present invention, the "C" structure metal layer 11 is made of gold, and the "C" structure metal layer 11 contains 128*128 "C" structure unit...

no. 2 example

[0074] The design method of the cross-polarization conversion optical device according to the second embodiment of the present invention modulates the excitation of the light beam incident on the cross-polarization conversion optical device by modulating the outer radius, inner radius, start angle and end angle of the "C" structural unit. Amplitude and phase of a radiated field with a vertical polarization state.

[0075] Figure 6 It is a flow chart of the design method of the cross polarization conversion optical device according to the second embodiment of the present invention, and the design method specifically includes the following steps:

[0076] 601. Calculate the grating period and the grating width of the metal grating layer. Specifically, the parameters of the dielectric layer and the "C" structure metal layer are kept constant, and the grating period and grating width of the metal grating layer are calculated according to the Fappaut resonance theory.

[0077] I...

no. 3 example

[0102] Steps 701 to 704 are the same as steps 601 to 604 in the second embodiment of the present invention.

[0103] 705 , using a group of "C" structural units obtained in step 704 to design a two-dimensional array of "C" structural metal layers. Specifically, the photoinduced results, the shape and size of the two-dimensional array are set, and the optimal arrangement of the two-dimensional array composed of eight "C" structural units is calculated.

[0104] In the third embodiment of the present invention, it is set that after the incident light of x polarization passes through the cross-polarization conversion optical device with the two-dimensional array of metal layers with the "C" structure, the optical result of focusing lens converging imaging on the object is realized; setting two The shape of the three-dimensional array is square, the size is 128*128 "C" structural units, and the center-to-center distance between two adjacent "C" structural units is 80 μm.

[0105]...

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Abstract

The invention relates to a cross polarization conversion optical device and a design method thereof. The design method comprises the steps of: fixing parameters of a dielectric layer and a ''C''-structure metal layer, and calculating a grating period and a grating width of a metal grating layer; fixing parameters of the metal grating layer and the ''C''-structure metal layer, and calculating thickness of the dielectric layer according to a Fabry-Perot resonance theory; fixing parameters of the metal grating layer and the dielectric layer, and calculating outer radiuses, inner radiuses, starting angles and ending angles of ''C''-structure units according to the Fabry-Perot resonance theory; adjusting the outer radiuses, the inner radiuses, the starting angles and the ending angles of the ''C''-structure units, and selecting a group of ''C''-structure units with discrete phases when the outer radiuses, the inner radiuses, the starting angles and the ending angles are of a plurality of different values; utilizing the group of ''C''-structure units with discrete phases to design a two-dimensional array of the ''C''-structure metal layer; and forming the metal grating layer, the dielectric layer and the ''C''-structure metal layer into the cross polarization conversion optical device which is used for converting incident x polarized light into y polarized light.

Description

technical field [0001] The invention relates to the field of optics, in particular to a cross polarization conversion optical device and a design method thereof. Background technique [0002] Polarization is an important characteristic of electromagnetic waves, which carries important information during the propagation and detection of electromagnetic waves. The cross polarization conversion device (CPC) can rotate the polarization state of the incident light wave by 90 degrees, so that the polarization directions of the outgoing light wave and the incident light wave are perpendicular to each other. Traditional CPCs are generally designed based on the characteristics of the material itself, such as crystal-based birefringence and total internal reflection. However, the operating bandwidth of this device is narrow, and the conversion effect is not good enough. Metasurface structure refers to artificial layered materials with a thickness smaller than the wavelength, which c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02B27/28G02B5/30
CPCG02B5/3033G02B27/0012G02B27/286
Inventor 张岩赵欢
Owner CAPITAL NORMAL UNIVERSITY
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