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Nano structure capable of improving asymmetric transmission and preparation method thereof

An asymmetric transmission and nanostructure technology, applied in the field of electromagnetic wave polarization state regulation, can solve the problem of small asymmetric transmission signal, and achieve the effects of outstanding asymmetric transmission performance, convenient preparation, reasonable and novel design

Active Publication Date: 2018-11-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In order to solve the problem of small asymmetric transmission signals of single-layer artificial nanostructures in the prior art, the present invention provides a nanostructure that can improve asymmetric transmission and its preparation method. The preparation method is simple and does not require repeated glue removal. , it can be formed with only one coating, but compared with the traditional single-layer artificial nanostructure, it can greatly improve the asymmetric transmission signal

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  • Nano structure capable of improving asymmetric transmission and preparation method thereof
  • Nano structure capable of improving asymmetric transmission and preparation method thereof
  • Nano structure capable of improving asymmetric transmission and preparation method thereof

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Embodiment 1

[0050] Such as figure 2 and image 3As shown, it is a nanostructure that can improve asymmetric transmission in the embodiment of the present application. The nanostructure that improves the asymmetric transmission has a simple preparation method and does not require repeated glue throwing. It can be formed with only one coating, but compared with the traditional single-layer artificial nanostructure, it can increase the asymmetric transmission signal by 5%.

[0051] A nanostructure that can improve asymmetric transmission is formed by connecting a plurality of nanostructure units with the same structure in a rectangular periodic array. The nanostructure unit is composed of a metal film 1, and an inclined rectangular hole 2 is provided on the metal film 1. The rectangular hole 2 There is an angle α between the long side and the x-direction of the nanostructure unit.

[0052] The rectangular hole 2 also includes a connecting strip 3, the two ends of the connecting strip 3 ar...

Embodiment 2

[0060] Based on the nanostructure that can improve asymmetric transmission described in Example 1, the embodiment of the present application discloses a method for preparing a nanostructure that can improve asymmetric transmission. The specific steps are as follows:

[0061] Step 1, prepare the substrate: prepare the ITO glass substrate and wash and dry it;

[0062] Specifically, the thickness of the ITO glass is 1.0mm, and the length and width are 20.0mm×20.0mm. Put the prepared ITO glass into the washing solution to clean it. After ultrasonication with deionized water for 15 minutes, ultrasonication with acetone for 15 minutes, and alcohol ultrasonication for 15 minutes , and then ultrasonicated with deionized water for 5 minutes, and finally dried with a nitrogen gun and placed in a nitrogen cabinet for later use.

[0063] Step 2, apply photoresist: apply PMMA photoresist on the ITO glass substrate prepared in step 1 with a glue spinner;

[0064] Specifically, the thicknes...

Embodiment 3

[0079] Based on the nanostructure that can improve the asymmetric transmission disclosed in Example 1, the embodiment of the present application discloses a nanostructure that can improve the asymmetric transmission, using the 3D finite element method of COMSOL Multiphysics to realize the transmission of the nanostructure in the embodiment of the application and simulation of asymmetric transmission effects.

[0080] Such as figure 2 and image 3 As shown, the metal thin film 1 is preferably a gold material, the size of the rectangular hole 2: long side a=540nm, short side b=200nm, the angle α=22.5° between the long side of the rectangular hole 2 and the x direction of the nanostructure unit, and the length of the connecting strip 3 c=200nm, width w=17.32nm, nanostructure unit period: Px=Py=620nm, metal thin film 1 thickness h=80nm.

[0081] When the LCP and RCP are incident from the front of the structure, their polarization state conversion rates to the incident light are...

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Abstract

The invention relates to the technical field of electromagnetic wave polarization regulation and control, in particular to a nano structure capable of improving asymmetric transmission and a preparation method thereof. The nano structure is formed by connecting multiple nano structure units with the same structure in a rectangular periodical array manner. Each nano structure unit comprises a metalthin film. An oblique rectangular hole is arranged in each metal thin film. An included angle alpha is formed between the long edge of each rectangular hole and the x direction of the corresponding nano structure unit. Each rectangular hole comprises a connection strip. Two ends of each connection strip are connected to two long edges of a corresponding rectangular hole and are perpendicular to the long edges of the rectangular hole. The metal thin films and the connection strips are made of the same precious metal materials. According to the invention, the preparation method is simple; repeated whirl coating is not required; the nano structure can be formed only through film coating at a time; and compared with the traditional single-layer artificial nano structure, the asymmetric transmission can be improved by about 50%.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave polarization regulation, and specifically relates to a nanostructure capable of improving asymmetric transmission and a preparation method thereof. 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 system A passes through system A, the received right circularly polarized (right circularly polarized, RCP) transmittance The transmittance of the right-handed light received after the left-handed light incident from the back of system A passes through system A is The direction of the arrow indicates that it is incident from the front or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G03F7/20B82Y40/00
Inventor 刘黎明王红航迟锋易子川水玲玲张中月李颖
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA ZHONGSHAN INST
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