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Micro-nano structure capable of adjusting circular dichroism

A micro-nano structure and dichroism technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of poor refractive index effect, slow response speed of circular dichroism regulation, and inflexible regulation, and achieve fast response speed. , the effect of convenient control

Pending Publication Date: 2022-03-22
XIAN UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ambient temperature changes VO 2 The refractive index effect is poor, resulting in slow response and inflexible control of circular dichroism

Method used

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  • Micro-nano structure capable of adjusting circular dichroism
  • Micro-nano structure capable of adjusting circular dichroism

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Effect test

Embodiment 1

[0022] The invention provides a micro-nano structure with adjustable circular dichroism. Such as figure 1 As shown, the micro-nano structure with tunable circular dichroism includes a substrate 1, a noble metal layer, a first carbon nanotube strip array, a first electrode 41, and a grid.

[0023] A noble metal layer is provided on the upper surface of the substrate 1 . The material of the precious metal layer is gold or silver. The material of the substrate 1 is an insulating material. The gate is sheet-shaped, and the gate is arranged on the lower surface of the substrate 1 . On the one hand, the substrate 1 is used to support the noble metal layer; on the other hand, the substrate 1 separates the gate and the noble metal layer. The noble metal layer includes U-shaped structures 2 arranged periodically, and the period is a rectangular period. The U-shaped structure 2 includes a first parallel arm 21 , a second parallel arm 22 , and a connecting arm. The first parallel ar...

Embodiment 2

[0029] On the basis of Example 1, such as figure 1 As shown, the lengths of the first parallel arm 21 and the second parallel arm 22 are not equal. Furthermore, the length of the first parallel arm 21 is greater than the length of the second parallel arm 22 . In this way, when a grid voltage is applied on the first carbon nanotube strip 31, the refractive index of the environment near the first parallel arm 21 is increased, so that the resonant wavelength of the first parallel arm 21 is more red-shifted, thereby more Added asymmetry or chirality to the U-shaped structure 2. Therefore, the change of the gate voltage can tune the chirality of the U-shaped structure 2 more.

Embodiment 3

[0031] On the basis of Embodiment 2, the first carbon nanotube strip 31 includes two carbon nanotubes, the two carbon nanotubes are parallel, and the distance between the two carbon nanotubes is less than 10 nanometers. In this way, not only a single carbon nanotube is coupled to the first parallel arm 21 , but also a coupling is produced between two carbon nanotubes. Therefore, a strong electric field gathers between the two carbon nanotubes and the first parallel arms 21 . The concentration of these strong electric fields changes the environment around the first parallel arm 21 more. Therefore, when the gate voltage changes, the surrounding environment of the first parallel arm 21 changes more, thereby achieving more obvious chiral regulation of the U-shaped structure 2 .

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Abstract

The invention relates to the technical field of circular dichroism application, in particular to a circular dichroism adjustable micro-nano structure which comprises a substrate, a noble metal layer, a first carbon nanotube strip array, a first electrode and a grid electrode. During application, the grid electrode and the first electrode are connected with an external circuit, and the grid voltage of the first carbon nanotube strip is changed, so that the effective dielectric constant of the first carbon nanotube strip is changed, the dielectric environment on the first parallel arm is changed, the chirality of the U-shaped structure is changed, and the circular dichroism regulation and control of the U-shaped structure are realized. According to the invention, the dielectric environment at the first parallel arm can be conveniently adjusted by adjusting the voltage between the first electrode and the grid electrode, so that the circular dichroism is adjusted and controlled, the adjustment and control are convenient and flexible, and the response speed is high.

Description

technical field [0001] The invention relates to the technical field of circular dichroism applications, in particular to a micro-nano structure with adjustable circular dichroism. Background technique [0002] Its own structure and its mirror image cannot overlap, which is called chiral structure. Circular dichroism refers to the difference in the degree of absorption of left-handed circularly polarized light and right-handed circularly polarized light. The relationship between the degree of absorption and wavelength is called circular dichroism. , is a spectroscopic method for the determination of molecular asymmetric structures. [0003] Studies have found that the circular dichroism of naturally occurring chiral structures is relatively weak, and metals and light have relatively strong interactions, so experimenters designed some metal nanostructures to obtain greater circular dichroism. When the metal nanostructure is prepared, its circular dichroism is fixed. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01
CPCG02F1/0136
Inventor 王勇凯董军白瑜任凯利韩庆艳
Owner XIAN UNIV OF POSTS & TELECOMM
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