A U-shaped structure for realizing circular dichroism and its preparation method

A circular dichroism and U-shaped technology is applied in the field of realizing the U-shaped structure of circular dichroism and its preparation, which can solve the problems of long preparation period, high investment cost, no simple preparation steps of three-dimensional chiral nanostructures, and the like, To achieve the effect of simple structure, reduced preparation cost and convenient preparation

Active Publication Date: 2021-03-09
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reported steps for preparing three-dimensional chiral nanostructures with height difference are not as simple as those for helical structures, and the preparation cycle is long and the input cost is high.

Method used

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  • A U-shaped structure for realizing circular dichroism and its preparation method
  • A U-shaped structure for realizing circular dichroism and its preparation method
  • A U-shaped structure for realizing circular dichroism and its preparation method

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Embodiment 1

[0037] In order to solve the problems existing in the prior art, this embodiment provides a U-shaped structure that realizes circular dichroism, and uses a combination of electron beam exposure technology and oblique angle deposition technology to prepare chiral metal nano U with different height differences. type structure. Such as figure 1 The U-shaped structural unit that realizes circular dichroism is shown, and the structure is formed by plane connection of a plurality of periodic units with the same structure; each periodic unit contains a U-shaped structural unit; each structural unit It includes a horizontal body I11, a horizontal body II12, and a vertical body 13; one end of the horizontal body I11 is vertically connected to one end of the vertical body 13; one end of the horizontal body II12 is vertically connected to the other end of the vertical body 13; The horizontal body I11, horizontal body II12, and vertical body 13 are not on the same horizontal plane; the h...

Embodiment 2

[0056] After the U-shaped structure for realizing circular dichroism of the present invention is prepared based on Example 1 and the steps, a calculation simulation test is performed by using the three-dimensional finite element method (FEM) calculation software COMSOL Multiphysics. The specific setting parameters are as follows:

[0057] Such as figure 1 As shown, the size of each periodic unit is: length 400 nm×width 400 nm; the size of horizontal body I11 is: length 200 nm×width 40 nm×thickness 40 nm; the size of vertical body 13 is: length 200 nm×width 40 nm×thickness 60 nm ; The dimensions of the horizontal body II12 are: length 200nm×width 40nm×thickness 100nm. Such as image 3 Shown is the circular dichroism spectrum of the U-shaped structure of the embodiment of the present application. It can be seen that there are two larger CD signals at the wavelengths of 720nm and 1540nm, the magnitudes are: 20.69% and 12.66%, respectively. The structure proves that crossed el...

Embodiment 3

[0059] The preparation steps are the same as in Example 1, except that the metal material used is copper.

[0060] Gold, silver, and copper are different metal materials. The dielectric coefficients of the materials are different, and the corresponding effective refractive indices are different. The position of the transmission peak and valley of the metal micro-nano structure prepared therefrom is not affected, but the transmission intensity will be different. Gold is better than silver, and silver is better than copper. The circular dichroism lines collected by the chiral metal nanostructure prepared by gold, silver, and copper will have a small red and blue shift; but because the metal material is made of gold or copper and Metal materials use silver to achieve circular dichroism in the same mechanism, so the difference in the circular dichroism spectra of the prepared chiral metal nanostructures is not very large. Therefore, in this embodiment, copper is used instead of go...

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Abstract

The invention relates to the field of micro-nano optics technology, in particular to a U-shaped structure for realizing circular dichroism and a preparation method thereof. U-shaped structural unit, each structural unit includes horizontal body I, horizontal body II, vertical body, one end of horizontal body I is vertically connected to one end of vertical body, one end of horizontal body II is vertically connected to the other end of vertical body, and horizontal body Ⅰ, horizontal body II, and vertical body are not on the same horizontal plane. First use the electron beam exposure technology to prepare the micro-nano structure template, then rotate the template substrate counterclockwise, and change the inclination angle and coating time of the electron beam evaporation coating, the evaporation coating in the oblique angle deposition technology to prepare chiral metal nanostructures with different height differences. structure. The invention has chiral metal nanostructures with different height differences, simple method and low cost, and can be applied to biological monitoring, enantiomer sensing, polarization conversion and optoelectronic circular polarizers.

Description

technical field [0001] The invention relates to the field of micro-nano optics technology, in particular to a U-shaped structure for realizing circular dichroism and a preparation method thereof. Background technique [0002] The word chirality is derived from Greek and means the symmetry of structure, which has important meaning in many disciplines. An object is said to be "chiral" if it is different from its mirror image, and its mirror image cannot be superimposed on the original object, just as the left and right hands are mirror images of each other and cannot be superimposed. Chirality is the basic characteristic of life process, and most of the organic molecules that make up living organisms are chiral molecules. [0003] The chiral signals of chiral molecules in nature are generally very weak. In recent years, researchers have discovered that surface plasmons generated by chiral metal nanostructures can be used to enhance chiral signals. Because the helical struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B1/00G03F7/00B82Y40/00
CPCB82Y40/00G02B1/00G03F7/00
Inventor 张中月景志敏唐先龙白瑜李颖
Owner SHAANXI NORMAL UNIV
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