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Gradually varied spiral metal chiral metamaterial circular polarizer

A chiral metamaterial, circular polarizer technology, applied in polarizing elements and other directions, can solve the problems of difficult integration, narrow operating wavelength range, low extinction ratio, etc., achieve high integration, high stability and reliability, and improve transparency. Overrate effect

Active Publication Date: 2015-12-09
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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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 propose a graded helical metal chiral metamaterial circular polarizer to solve the problems of narrow operating wavelength range, low extinction ratio and difficulty in integration of traditional circular polarizers

Method used

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  • Gradually varied spiral metal chiral metamaterial circular polarizer
  • Gradually varied spiral metal chiral metamaterial circular polarizer
  • Gradually varied spiral metal chiral metamaterial circular polarizer

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preparation example Construction

[0025] The preparation method of the gradient helical chiral metal metamaterial circular polarizer of the present invention includes two kinds of laser beam direct writing technology and mechanical processing technology. When 1≤n≤20, the preparation method adopts laser beam direct writing technology; when 20 When figure 2 As shown, the specific preparation steps of the gradual helical chiral metal metamaterial circular polarizer prepared by the laser beam direct writing process of the present invention are as follows (referring to JustynaK.Ganselet.al.CirclePolarizerGoldHelixPhotonicMetamaterialasBroadband, Science325,1513(2009)):

[0026] 1 as figure 2 As shown in (a), first deposit a layer of ITO conductive layer film on the surface of the substrate, and evenly spin-coat photoresist on the conductive layer.

[0027] 2 as figure 2 As shown in (b), through the laser beam direct writing process, a uniformly distributed gradient air-gap helical array with a designed size is ...

Embodiment 1

[0034] The graded helical metal chiral metamaterial circular polarizer of this embodiment is deposited with aluminum helical arrays 2 arranged periodically on the front of the quartz glass substrate 1, the lateral period of the helix is ​​p=900nm, the helical pitch SH=922.5nm, and the helical The number of periods NH=6, the number of helix periods of the upper and lower part of the helix is ​​3, the minimum helix diameter DH of the upper part of the helix min =90nm, the largest helix diameter DH max =720nm, the helix diameter of the lower part of the helix is ​​DH=720nm, and the helix diameter is DW=67.5nm.

[0035] The preparation method of the graded helical chiral metal metamaterial circular polarizer in this embodiment is as follows:

[0036] 1 as figure 2 As shown in (a), first deposit a layer of ITO conductive layer film on the surface of the substrate, and evenly spin-coat photoresist on the conductive layer.

[0037] 2 as figure 2 As shown in (b), through the las...

Embodiment 2

[0042] In the graded helical chiral metal metamaterial circular polarizer of this embodiment, a gold helix array 2 periodically arranged is deposited on the front of the quartz glass substrate 1, the helix lateral period p=2 μm, the helix pitch SH=1.845 μm, and the helix The number of periods NH=4, the number of helix periods of the upper and lower part of the helix is ​​2, the minimum helix diameter DH of the upper part of the helix min =200nm, the largest helix diameter DH max = 1.6 μm, the helix diameter DH of the lower part of the helix = 1.6 μm, and the helix diameters are all DW = 150 nm.

[0043] The preparation method of the graded helical chiral metal metamaterial circular polarizer in this embodiment is as follows:

[0044] 1 as figure 2 As shown in (a), first deposit a layer of ITO conductive layer film on the surface of the substrate, and evenly spin-coat photoresist on the conductive layer.

[0045] 2 as figure 2 As shown in (b), through the laser beam direc...

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Abstract

The invention discloses a gradually varied spiral metal chiral metamaterial circular polarizer which includes a substrate and a gradually varied spiral metal line array which is evenly deposited on the substrate. The spiral metal line array is composed of spiral metal line units which are in periodic configuration. Each spiral metal line unit is formed by an upper part spiral metal line and a lower part spiral metal line which are connected, and the upper part spiral metal line and the lower part spiral metal line have the same spiral direction. The upper part spiral metal line has a semi-diameter which successively gets bigger from top to bottom, and the lower part spiral metal line has the same-length diameter. Compared with an equal-diameter spiral circular polarizer, the gradually varied spiral circular polarizer can effectively couple incident light rays, and reduce light transmittance of circularly polarized light in a non-matched polarization direction, and has a stronger resonance as to the circularly polarized light in a polarization direction which matches the spiral direction, thereby having a higher extinction ratio (as high as 105). Compared with traditional circular polarizers, the gradually varied spiral circular polarizer has a configuration which is characterized by high extinction ratio, small size and wide band, can achieve the preparation of a micro-sized circular polarization array, and is applicable to fields such as polarization imaging detection, displaying and laser, etc.

Description

technical field [0001] The invention relates to a circular polarizer, in particular to a circular polarizer of a graded helical metal chiral metamaterial. Background technique [0002] Circular polarizer is an important optical component in the field of polarization optics, and has important applications in the fields of polarization splitting, polarization imaging, color display and laser technology. Currently, the use of linear polarizers and quarter-wave plates is the most common way to realize and control circularly polarized light. However, when such a device is used, it must converge and collimate the input and output light passing through the linear polarizer, and at the same time ensure the precise alignment of the linear polarizer and the quarter-wave plate when they are connected to each other; the system is composed of discrete devices , not only greatly increases the loss of the whole system, but also greatly increases the instability of the system, the volume i...

Claims

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Application Information

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IPC IPC(8): G02B5/30
CPCG02B5/30
Inventor 王少伟冀若楠刘星星陆卫陈效双
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI