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A single-layer gold nanostructure realizing asymmetric transport and its preparation method

A technology of asymmetric transmission and gold nanostructure, applied in the field of single-layer gold nanostructure and its preparation, can solve the problems of slow etching, low asymmetric transmission effect, complex three-dimensional structure, etc., achieving simple structure and saving exposure time , the effect of improving the preparation efficiency

Active Publication Date: 2019-06-07
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problems existing in the prior art that the three-dimensional structure of the asymmetric transmission is complex, and the part other than the gap is etched by an electron beam during the exposure pattern of the planar structure, the etching is very slow, and the asymmetric transmission effect is not high. The invention provides a single-layer gold nanostructure for asymmetric transport and its preparation method

Method used

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  • A single-layer gold nanostructure realizing asymmetric transport and its preparation method
  • A single-layer gold nanostructure realizing asymmetric transport and its preparation method
  • A single-layer gold nanostructure realizing asymmetric transport and its preparation method

Examples

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Embodiment 1

[0050] like figure 2 The single-layer gold nanostructure for asymmetric transmission shown in the right figure is composed of multiple identical structural units connected up and down, left and right. The structural diagram of each structural unit is shown in figure 2 As shown in the figure on the left, the structural unit is a single-layer structure with equal periodic side lengths, and all structural units are located on the same plane; the structural unit includes the first horizontal body 1, the second horizontal body 2 and the third horizontal body 3, The first horizontal body 1, the second horizontal body 2 and the third horizontal body 3 are parallel to each other, the distance between the second horizontal body 2, the first horizontal body 1 and the third horizontal body 3 is equal, and the first horizontal body 1, the second horizontal body The centers of the horizontal body 2 and the third horizontal body 3 are on the same straight line; the lengths of the second h...

Embodiment 2

[0070] Based on the parameters and steps of Example 1, after the single-layer gold nanostructure for realizing asymmetric transmission of the present invention is prepared, a calculation simulation test is performed by using the three-dimensional finite element method (FEM) calculation software COMSOL Multiphysics.

[0071] like figure 2 As shown, the parameters of the set structure are a1=57nm; a2=140nm; a3=57nm; b1=140nm; b2=270nm; b3=120nm; b4=25nm;

[0072] When preparing the structure of this embodiment, after using a pattern generator to set according to the above structure, the structure pattern is exposed with an electron beam, and the rest of the steps are the same as the preparation method in Example 1.

[0073] The transmission spectrum of the single-layer gold nanostructure that realizes asymmetric transmission prepared in this example is as follows Figure 4 shown, from Figure 4 It can be seen that at the resonance positions of 650nm and 1300nm, the conversion...

Embodiment 3

[0081] In the single-layer gold nanostructure for realizing asymmetric transmission in this embodiment, only the width of the second horizontal body 2 is changed, and other parameters remain unchanged, which are the same as in Embodiment 2. In the structure of this embodiment, the width b5 of the second horizontal body 2 is 80 nm.

[0082] The transmission spectrum of the single-layer gold nanostructure that realizes asymmetric transmission prepared in this example is as follows Figure 8 As shown, the conversion rate of the asymmetric transmission of the monolayer gold nanostructure that realizes the asymmetric transmission of the present embodiment is as follows Figure 9 shown.

[0083] Will Figure 8 , Figure 9 with Example 2 Figure 4 , Figure 5 By comparison, it can be seen that after changing the parameters of b5, the resonance position of the transmission line is compared with that before the change, the resonance mode does not change, but the resonance position...

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Abstract

The invention relates to a single-layer gold nano-structure capable of realizing asymmetric transmission and a preparation method thereof. The single-layer gold nano-structure is prepared through the following ten steps of: preparing a substrate; applying photoresist; performing post-photoresist application drying; using an electron beam to expose the pattern of the structure; performing developing; performing fixation; performing post-fixation drying; performing gold plating; stripping the photoresist; and performing drying. The single-layer gold nano-structure of the invention is of structural simplicity; the single-layer gold nano-structure has connectivity, so that the coupling of light and the metal micro-nano structure can be enhanced, and the asymmetric transmission characteristic of the light can be realized; and the length of first vertical bodies of the single-layer gold nano-structure and the length of third bodies of the single-layer gold nano-structure are set to be unequal, and therefore, the single-layer gold nano-structure has two more resonance modes than a structure with first vertical bodies and third vertical bodies which are equal in length, and thus, the adjustment of a plurality of frequency bands can be realized, and two relatively large asymmetric transmission effects can be generated. According to the preparation method of the invention, in the exposure process of the pattern of the structure, the electron beam etches a part of the pattern of the structure, and therefore, the exposure time of the pattern of the structure is saved, and preparation efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave polarization regulation, and specifically relates to a single-layer gold nanostructure for realizing asymmetric transmission and a preparation method thereof. Background technique [0002] Asymmetric transmission refers to the effect of different conversion efficiencies when waves of the same polarization state are incident from the front and back of the transmission structure, that is, photons have different transmittances in different incident directions, resulting in a difference, which is called asymmetric transmission. effect. For circularly polarized light, it is assumed that the incident light is right-handed circularly polarized light (RCP), and there are both right-handed circularly polarized light and left-handed circularly polarized light (LCP) converted by the structure in the outgoing light. The proportion of left-handed and right-handed light in the incident light is di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G03F7/00
CPCG02B5/30G03F7/0005
Inventor 张中月白瑜王明艳吐达洪·阿巴陈语嫣
Owner SHAANXI NORMAL UNIV
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