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Double-F-shaped nanopore array and method therefore for regulating and controlling circular dichroism

A nanopore array, nanopore technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of difficult to control the size and position of the signal, weak circular dichroism signal, etc., and achieve a simple, fast and easy adjustment method. , the effect of easy preparation

Inactive Publication Date: 2019-02-01
中山科立特光电科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems in the prior art that the circular dichroism signal produced by the two-dimensional planar chiral structure is weak and it is not easy to control the size and position of the signal, the present invention provides a double F-type nanohole array and a circular dichroism control Chromaticity method, under the irradiation of left-handed circularly polarized light and right-handed circularly polarized light, the surface electric field intensity of the structure is different, resulting in a large chirality difference in the structure, resulting in an obvious large circular dichroism signal, and, based on this The method of regulating the circular dichroism of the structure is simple, convenient and easy to operate

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  • Double-F-shaped nanopore array and method therefore for regulating and controlling circular dichroism

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Embodiment 1

[0032] A double F-type nanohole array, which is composed of a plurality of metal nano-unit structures spliced ​​in a rectangular periodic array, each metal nano-unit structure is made of a rectangular metal nano-film 1, and the middle of the rectangular metal nano-film 1 forms a center Symmetrical double F-shaped nanopores 2 . The double F-type nanopore 2 is composed of a first rectangular hole 21 , a second rectangular hole 22 , a third rectangular hole 23 , a fourth rectangular hole 24 and a fifth rectangular hole 25 .

[0033] in particular:

[0034] When incident light irradiates the structure of this embodiment, the structure of this embodiment belongs to a planar chiral structure, which has different absorption rates for left-handed and right-handed circularly polarized light, thereby generating circular dichroism.

[0035] Such as figure 1 and figure 2 As shown, the long side of the first rectangular hole 21 is parallel to one side of the rectangular cycle, and is a...

Embodiment 2

[0042] In order to further illustrate the circular dichroism effect of the double F-type nanohole array in the embodiment of the present application, this embodiment discloses the size and the principle of the circular dichroism of the double F-type nanohole array in embodiment 1. Using the three-dimensional finite element simulation software COMSOL Multiphysics, the characteristics of the double F-type nanohole array were numerically simulated, and the specific parameters were optimized as follows:

[0043] The side length of the rectangular period is P x=600nm,P y = 600nm. The thickness of described rectangular metal nano film 1 is 40nm, the length L=480nm of described first rectangular hole 21, width W=200nm, described second rectangular hole 22 and the 3rd rectangular hole 23 and described 4th rectangular hole 24 and the fifth rectangular hole 25 have a length l=160nm and a width w=50nm, and the width of the gap 20 is g=50nm.

[0044] The rectangular metal nano film 1 i...

Embodiment 3

[0049] This embodiment discloses a method for regulating circular dichroism. The method for regulating circular dichroism in this embodiment is based on the double F-type nanohole array proposed in the above-mentioned embodiment 2. In this embodiment, by changing the double F-type The structural parameters in the nanohole array can be used to change the symmetry of the structural unit and realize the regulation of the size and position of the circular dichroism. Using the 3D finite element simulation software COMSOL Multiphysics, the characteristics of the double F-shaped nanohole arrays were numerically simulated.

[0050] The first is to regulate the circular dichroism signal through the distance between two rectangular holes, and the specific parameters are preferably as follows:

[0051] The rectangular period is preferably a square period P x =P y =600nm, the thickness of the rectangular metal nano film 1 is 40nm. The length of the first rectangular hole 21 is L=480nm,...

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Abstract

The invention relates to the field of micro-nano optics, in particular to a double-F-shaped nanopore array and a method therefore for regulating and controlling circular dichroism. The double-F-shapednanopore array is spliced by a plurality of metal nano unit structures according to a rectangular period array; each metal nano unit structure is manufactured by a rectangular metal nano film; and acentrosymmetric double-F-shaped nanopore is formed in the middle of the rectangular metal nono film. Since left and right rotation polarized light is irradiated on the structure, generated electric field strengths are different so as to cause big circular dichroism, and the maximum circular dichroism is 41%. In addition, the invention puts forward the method for regulating and controlling circulardichroism on the basis of the double-F-shaped nanopore array. By use of the method, a vanadium dioxide phase change material is arranged in the structure to change the temperature of the environmentwhere the structure is positioned to regulate and control circular dichroism. The method is simple and feasible, saves resources and is easy in operation.

Description

technical field [0001] The invention belongs to the field of regulation and control of electromagnetic wave polarization state, and in particular relates to a double F-type nanohole array and a method for regulating circular dichroism. Background technique [0002] Chirality refers to the property that the structure does not completely coincide with its mirror image, and circular dichroism (CD, circular dichroism) is a method for detecting chirality. Circular dichroism refers to the property that a chiral structure absorbs left-handed and right-handed circularly polarized light differently. [0003] The circular dichroism of chiral molecules in nature is very weak, which is not conducive to the actual signal detection in biomedicine and pharmacology. The artificial chiral nanostructure has strong circular dichroism due to its interaction with left-handed and right-handed circularly polarized light to generate different surface plasmon resonance modes. [0004] Three-dimens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/01
CPCG02F1/0136
Inventor 刘凯王天堃冯晓钰
Owner 中山科立特光电科技有限公司
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