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Multi-polarization-state generator based on meta-structure surface

A metasurface, multi-polarization technology, applied in the direction of polarizing elements, can solve the problems that cannot be realized, and the miniaturization of devices cannot be realized.

Active Publication Date: 2020-08-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, people often used traditional birefringent materials or chiral materials to make polarization generators to change the polarization state, but due to the limitation of its working principle, the device cannot be miniaturized
In recent years, the emergence of metamaterials and metasurfaces has provided new ideas for people to overcome this defect, but how to use a metasurface to simultaneously generate multiple different polarization states (linear polarization, circular polarization) has always been an issue in the field. technical difficulties, it is still not possible to achieve

Method used

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  • Multi-polarization-state generator based on meta-structure surface
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  • Multi-polarization-state generator based on meta-structure surface

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Embodiment 1: In this embodiment, the specific response band 1250-1300nm of the microstructure is located in the near-infrared band, image 3 It is the experimental diagram of the beam splitting of the multi-polarization generator in the first arrangement. image 3 (a) is the scanning electron micrograph of the prepared sample. There are 8 microstructures in the structural unit of the polarization generator, corresponding to S 8 ,S 1 ,S 2 ’,S 7 ’,S 4 ,S 5 ,S 6 ’,S 3 '. image 3 In (b) is the wide-angle diffraction spectrum in the wavelength range of 1200nm to 1350nm, the angle measurement range is (-60°)-(-12°) and 12°-60° (the area on both sides of the white dotted line), in the figure The color reflects the strength of reflectivity (reflected light intensity / incident light intensity). The spatial distribution of the diffracted light shows that in the 1250-1300nm band, four beams of diffracted light along the +3, +1, -1, -3 orders are generated simultaneously,...

Embodiment 2

[0064] Example 2: Figure 4It is the experimental diagram of the beam splitting of the multi-polarization generator in the second arrangement mode, and the specific response band is 1250-1300nm. Figure 4 (a) is the scanning electron micrograph of the prepared sample. There are 8 microstructures in a polarizing beam splitter structural unit, corresponding to S 1 ,S 8 ’,S 1 ,S 8 ’,S 5 ,S 4 ’,S 5 ,S 4 '. Figure 4 In (b) is the wide-angle diffraction spectrum in the wavelength range of 1200nm to 1350nm, the angle measurement range is (-60°)-(-12°) and 12°-60° (the area on both sides of the white dotted line), the diffracted light The spatial distribution shows that at 1250-1300nm, four beams of diffracted light along the +3, +1, -1, -3 orders are produced simultaneously, while the even orders are extinguished. Figure 4 Middle (c) is the experimental measurement result of the reflected light intensity of the four beams. I +45°,+1 Indicates the reflectivity of +1 order...

Embodiment 3

[0065] Example 3: Figure 5 It is the experiment and simulation diagram of multi-polarization generator beam splitting under the third arrangement mode, and the specific response band is 1250-1300nm. Figure 5 (a) is the scanning electron micrograph of the prepared sample. There are 8 microstructures in a polarizing beam splitter structural unit, corresponding to S 1 ,S 2 ,S 5 ’,S 2 ’,S 5 ,S 6 ,S 1 ’,S 6 '. Figure 5 In (b) is the wide-angle diffraction spectrum in the wavelength range of 1200nm to 1350nm, the angle measurement range is (-60°)-(-12°) and 12°-60° (the area on both sides of the white dotted line), the diffracted light The spatial distribution shows that at 1250-1300nm, four beams of diffracted light along the +3, +1, -1, -3 orders are produced simultaneously, while the even orders are extinguished. Figure 5 In (c) is the experimental measurement result of the intensity of the four beams of reflected light, I R,+1 Indicates the reflectivity of +1 order...

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Abstract

The invention discloses a multi-polarization-state generator based on a meta-structure surface. The generator comprises a metal reflection layer and an SiO2 layer and a metal microstructure layer which are sequentially formed on the metal reflection layer, the metal microstructure layer comprises a plurality of structural units which are periodically distributed, each structural unit is composed of N microstructures which are linearly arranged, and the microstructures are selected from a preset microstructure library; a microstructure in the microstructure library comprises M L-shaped structures with different sizes and M L-shaped mirror image structures; the microstructure has a polarization conversion characteristic of converting linearly polarized light of a specific response waveband into circularly polarized light; and the multi-polarization-state generator is further configured to convert the linearly polarized light of the specific response wave band which is in normal incidenceinto at least two linearly polarized and / or circularly polarized light beams which are emitted along different angles. According to the invention, normal incident linearly polarized light can be converted into two or more beams of light beams with different polarization states under a specific response wave band, and the light beams are emitted along different directions.

Description

technical field [0001] The invention belongs to the technical field of optoelectronic information functional devices and material preparation, and in particular relates to a metasurface-based multi-polarization generator. Background technique [0002] The polarization state generator can convert a specific polarization incident light into a specific polarization state outgoing light, and the simultaneous generation of multiple polarization states has important applications in quantum computing and quantum communication. In the past, people often used traditional birefringent materials or chiral materials to make polarization generators to change the polarization state, but due to the limitation of its working principle, the device could not be miniaturized. In recent years, the emergence of metamaterials and metasurfaces has provided new ideas for people to overcome this defect, but how to use a metasurface to simultaneously generate multiple different polarization states (l...

Claims

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Application Information

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IPC IPC(8): G02B5/30
CPCG02B5/30
Inventor 王牧彭茹雯高雅君熊翔陈飞郝西萍
Owner NANJING UNIV
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