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An optical polarizer and a method for adjusting its asymmetric transmission characteristics

An asymmetric transmission and polarizer technology, which is applied in optics, polarizing elements, optical elements, etc., can solve the problems that asymmetric transmission characteristics cannot be changed, achieve strong promotion and application value, improve detection sensitivity, and make easy preparation

Active Publication Date: 2021-05-25
三明华腾光电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In order to solve the problems in the prior art that the preparation of double-layer or multi-layer structures is complicated and the asymmetric transmission characteristics of the fixed structure cannot be adjusted, the present invention provides an optical polarizer and a method for adjusting the asymmetric transmission characteristics thereof. The asymmetric transmission characteristics can be adjusted by controlling the properties of the metal material filled in the semicircular hole, which solves the problem in the prior art that the asymmetric transmission characteristics cannot be changed after the structure is formed

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  • An optical polarizer and a method for adjusting its asymmetric transmission characteristics
  • An optical polarizer and a method for adjusting its asymmetric transmission characteristics
  • An optical polarizer and a method for adjusting its asymmetric transmission characteristics

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Embodiment 1

[0041] Such as figure 2 and image 3As shown, a metal optical polarizer in this embodiment includes a base layer and a planar structure, and the planar structure is formed by connecting a plurality of nano-period units 10 with the same structure in a rectangular periodic array. The optical polarizer of this embodiment is a planar structure with planar chirality, which can produce different polarization conversion rates for different circularly polarized lights. Strong promotion and application value.

[0042] Such as image 3 As shown, the nano-period unit 10 is a rectangular block, and each period unit 10 contains a structural unit. The structural unit is composed of a rectangular hole 11 and a semicircular hole 12. The arc of the semicircular hole 12 and the rectangular hole The long sides of the 11 are separated or tangent, the diameter of the semicircular hole 12 is parallel to the long side of the rectangular hole 11, each nano-period unit 10 is made of noble metal ma...

Embodiment 2

[0048] Based on the structure of the optical polarizer in Embodiment 1, this embodiment discloses a method for adjusting the asymmetric transmission characteristics of the optical polarizer, comprising the following steps:

[0049] Step 1. At room temperature, place the optical polarizer in a closed device filled with hydrogen, add the catalyst palladium, and let it stand for more than 30 minutes. The metal Mg filled in the semicircular hole 12 undergoes a hydrogenation reaction with hydrogen to generate MgH 2 , which is equivalent to the medium, so that the structure of the optical polarizer changes, and its asymmetric transmission characteristics change accordingly;

[0050] Step 2, at room temperature, place the hydrogenated optical polarizer in an oxygen environment, MgH 2 An oxidative dehydrogenation reaction occurs, the metal filled in the semicircular hole 12 is reduced to metal Mg, and the asymmetric transmission characteristics of the optical polarizer are restored to...

Embodiment 3

[0060] The optical polarizer in this embodiment is a planar structure with planar chirality, which can produce different polarization conversion rates for different circularly polarized light, and achieve the purpose of adjusting the conversion characteristics of circularly polarized light without re-preparation.

[0061] Based on the optical polarizer structure in Example 1, before and after the property conversion of the filler metal Mg, a simulation calculation simulation experiment was performed by using the three-dimensional finite element method (FEM) calculation software COMSOL Multiphysics. The specific setting parameters are as follows:

[0062] The long side of the rectangular hole 11 is 520 nm, and the short side is 200 nm; the radius of the semicircular hole 12 is 100 nm; the vertical distance between the arc side of the semicircular hole 12 and the long side of the rectangular hole 11 is 5 nm ; The length of the nano-periodic unit 10 is 630 nm × width 630 nm × thi...

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Abstract

The invention relates to an optical device, in particular to an optical polarizer and a method for adjusting its asymmetric transmission characteristics. The optical polarizer includes a base layer and a planar structure, and the planar structure is composed of a plurality of nano-period units with the same structure Rectangular periodic arrays are connected, and each periodic unit contains a structural unit. The structural unit is composed of a rectangular hole and a semicircular hole. The arc of the semicircular hole is separated from or tangent to the long side of the rectangular hole; The diameter of the circular hole is parallel to the long side of the rectangular hole; each nano-period unit is made of noble metal material, and the semicircular hole is completely filled with metal Mg. The structure of the optical polarizer of the present invention can achieve the purpose of adjusting its asymmetric transmission characteristics through the transformation of the properties of the metal filled in the semicircular hole. The adjustment method is simple and convenient, and provides a new idea for the design of the optical polarizer.

Description

technical field [0001] The invention belongs to the technical field of optical devices, and in particular relates to an optical polarizer and a method for adjusting its asymmetric transmission characteristics. Background technique [0002] Asymmetric transmission (Asymmetric Transmission, AT) means that the transmission system exhibits different conversion performances for electromagnetic waves incident along different transmission directions. Such as figure 1 As shown in (a), for a polarization conversion asymmetric transmission system A, after the left circularly polarized (LCP) incident from the front of the system A passes through the system A, the received right circularly polarized (LCP) RCP) the transmittance is , the transmittance of the left-handed light incident from the back of system A to the right-handed light received after passing through system A is . The direction of the arrow indicates that it is incident from the front or back of the transmission sys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCG02B5/3033
Inventor 赵文静
Owner 三明华腾光电科技有限公司
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