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A multi-polarization generator based on metasurface

A metasurface, multi-polarization technology, applied in polarizing elements and other directions, can solve the problems that the device cannot be miniaturized and cannot be realized.

Active Publication Date: 2021-11-02
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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  • A multi-polarization generator based on metasurface
  • A multi-polarization generator based on metasurface
  • A multi-polarization generator based on metasurface

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Embodiment 1: The specific response band 1250-1300nm of the microstructure in this embodiment is located in the near-infrared band, image 3 It is the experimental diagram of the multi-polarization generator beam splitting under the first arrangement. image 3 The middle (a) is the scanning electron microscope photo 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 The middle (b) is the wide-angle diffraction spectrum in the wavelength range of 1200nm to 1350nm, and the angle measurement range is (-60°)-(-12°) and 12°-60° (the area on both sides of the white dotted line). Color reflects the strength of reflectivity (reflected light intensity / incident light intensity). The spatial distribution of the diffracted light indicates that in the 1250-1300 nm band, four diffracted lights along the +3, +1, -1, -3 orders are simultaneously generat...

Embodiment 2

[0064] Example 2: Figure 4It is the experimental diagram of the multi-polarization generator beam splitting under the second arrangement, and the specific response band is 1250-1300 nm. Figure 4 The middle (a) is the scanning electron microscope photo 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 The middle (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 1250-1300 nm, four diffracted beams along the +3, +1, -1, -3 orders are generated simultaneously, while the even orders are extinct. Figure 4 In (c) is the experimental measurement of the intensity of the four reflected light beams. I +45°,+1 Indicates the reflectivity of +1 order +45° ...

Embodiment 3

[0065] Example 3: Figure 5 It is the experiment and simulation diagram of the multi-polarization generator beam splitting under the third arrangement, and the specific response band is 1250-1300nm. Figure 5 The middle (a) is the scanning electron microscope photo 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 The middle (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 1250-1300 nm, four diffracted beams along the +3, +1, -1, -3 orders are generated simultaneously, while the even orders are extinct. Figure 5 In (c) is the experimental measurement of the intensity of the four reflected light beams, I R,+1 represents the reflectivity of +1 or...

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Abstract

The invention discloses a multi-polarization generator based on a metasurface, comprising a metal reflective layer and SiO sequentially formed on the metal reflective layer 2 layer and a metal microstructure layer, the metal microstructure layer includes a plurality of periodically distributed structural units, the structural units are composed of N microstructures arranged in a straight line, and the microstructures are selected from a preset microstructure library; in the microstructure library The microstructure includes M L-shaped structures of different sizes and M L-shaped mirror structures; the microstructure has polarization conversion characteristics that can convert normal incident linearly polarized light of a specific response band into circularly polarized light; multi-polarization generator It is also configured to convert normal incident linearly polarized light of a specific response band into at least two linearly polarized and / or circularly polarized light beams that exit at different angles. The invention can convert normal incident linearly polarized light into two or more beams with different polarization states under a specific response wave band and emit them in different directions.

Description

technical field [0001] The invention belongs to the technical field of photoelectric information functional device and material preparation, and in particular relates to a multi-polarization state generator based on a metasurface. 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 state generators to realize the change of 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 generate multiple different polarizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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