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Heterogeneous metal mesh metamaterial structure for realizing circular dichroism

A heterogeneous metal, circular dichroism technology, applied in the field of micro-nano optics, can solve the problems of difficult manufacturing, weak circular dichroism, and difficult preparation.

Active Publication Date: 2021-12-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The traditional metal chiral structures that achieve circular dichroism mostly adopt multilayer structures. Multilayer chiral structures generally have good circular dichroism, but due to their complex structures, it is generally difficult to prepare them in experiments. more difficult
Compared with multilayer structures, single-layer chiral structures are easier to prepare, but some optical structures provided in the prior art are composed of a single medium, and complex single-layer structures need to be designed to achieve chiral effects, which greatly increases their fabrication. Difficulty, and its circular dichroism is generally weak

Method used

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  • Heterogeneous metal mesh metamaterial structure for realizing circular dichroism
  • Heterogeneous metal mesh metamaterial structure for realizing circular dichroism
  • Heterogeneous metal mesh metamaterial structure for realizing circular dichroism

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Embodiment 1

[0021] This embodiment provides a figure 1 The heterogeneous metal mesh metamaterial structure shown includes a substrate 1, the substrate 1 mainly plays a role in manufacturing, the substrate 1 is made of silicon dioxide, and the gold grating 2 and the The silver gratings 3 intersect each other, but are not perpendicular, and the silver gratings 3 are truncated by the gold gratings 2 to form a silver nanorod array;

[0022] Further, the periods and metal line widths of the structural gold and silver gratings are 400nm and 140nm respectively, and the included angle between groups of gratings is 65 degrees. The thickness of the metal layer is 50nm.

[0023] In order to further illustrate the circular dichroism characteristics of the heterogeneous metal mesh metamaterial in Example 1, this embodiment discloses its transmission spectrum and circular dichroism spectrum under the irradiation of left-handed and right-handed circularly polarized light, such as figure 2 with imag...

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Abstract

The invention belongs to the technical field of micro-nano optics and relates to a heterogeneous metal mesh metamaterial structure for realizing circular dichroism. The heterogeneous metal mesh metamaterial structure comprises a substrate 1 and a metal layer 2 positioned on the substrate 1. The metal layer comprises a metal grating 3 and a metal grating 4, the metal grating 3 and the metal grating 4 intersect with each other but are not perpendicular to each other, and the metal grating 4 is cut into periodic nanorod arrays by the metal grating 3. According to the heterogeneous metal mesh metamaterial structure for realizing the circular dichroism, an absorbed circular dichroism signal can be generated, the maximum value can reach 40%, and the circular dichroism can be dynamically adjusted by adjusting the grating period and the duty ratio; and in addition, the preparation method of the heterogeneous metal mesh metamaterial structure for realizing circular dichroism is simple, is low in preparation cost and has a good application prospect.

Description

technical field [0001] The invention relates to the field of micro-nano optics technology, in particular to a heterogeneous metal mesh metamaterial structure for realizing circular dichroism. Background technique [0002] Chirality refers to the property that itself cannot completely coincide with the mirror image, and a chiral substance and its mirror image are called chiral counterparts. The structure of many substances in nature has chirality, such as protein, DNA and so on. Chirality is particularly important to the significance of life, so detecting the chirality of substances has become a research hotspot for many researchers. Circular dichroism (CD) is usually used to detect the chirality of substances or structures. CD can be defined as the difference in the absorption rate of chiral media for different circularly polarized light, and the difference is circular dichroism. [0003] Since chiral signals such as biomolecules are relatively weak and usually located in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00G02B5/30
CPCG02B1/002G02B5/30
Inventor 郭小伟秦茂森蒋婷郑慧宜李绍荣
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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