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A micro-nano metal structure realizing asymmetric transmission and its preparation method

An asymmetric transmission, metal structure technology, applied in the field of electromagnetic wave polarization state regulation, can solve the problem of low asymmetric transmission efficiency, and achieve the effects of simple and convenient preparation method, simple structure and easy preparation

Active Publication Date: 2019-12-27
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem in the prior art that only a single magnetic dipole or electric dipole can be generated and the obtained asymmetric transmission efficiency is low, the present invention provides a micro-nano metal structure and its The preparation method provides a "double F"-shaped planar micro-nano metal structure, at T +- In the case of , the charge distribution on the "double F"-shaped structure is similar to that in the C-shaped structure, and a magnetic dipole resonance mode is formed at the open ring structure, and the corresponding polarization conversion line is also similar to that of the C-shaped structure. Similar to the pattern that manifests itself as a resonant valley

Method used

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  • A micro-nano metal structure realizing asymmetric transmission and its preparation method
  • A micro-nano metal structure realizing asymmetric transmission and its preparation method
  • A micro-nano metal structure realizing asymmetric transmission and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Such as figure 2 (b) The micro-nano metal structure that realizes asymmetric transport is shown by figure 2 (c) Multiple periodic units with the same structure are connected up and down, left and right, and all the periodic units are located on the same plane; each periodic unit is 400nm long × 400nm wide. Each periodic unit contains a structural unit; the structural diagram of each structural unit is as follows figure 2 As shown in (a), the structural unit is a single-layer structure with equal length of 330nm and width of 270nm.

[0057] The structural unit includes horizontal body I1, horizontal body II2, horizontal body III3, horizontal body IV4 and vertical body 5. The ends of horizontal body I1, horizontal body II2, horizontal body III3 and horizontal body IV4 are arranged in sequence from top to bottom 5 are vertically connected, horizontal body I1, horizontal body II2, horizontal body III3, and horizontal body IV4 are equally spaced and parallel to each oth...

Embodiment 2

[0075] After the micro-nano metal structure realizing asymmetric transmission 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.

[0076] Such as figure 2 As shown, set the parameters of the structure a=150nm; d=50nm; w=30nm; b=270nm; h=30nm; px=py=400nm.

[0077]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.

[0078] The polarization conversion transmission spectrum of the micro-nano metal structure that realizes asymmetric transmission prepared in this example is as follows: Figure 6~Figure 7 As shown, it can be seen that T+- is a valley mode at 1560 nm, which reaches the minimum value of polarization con...

Embodiment 3

[0084] In the micro-nano metal structure for asymmetric transmission in this embodiment, only the length a of the horizontal body is changed, and other parameters remain unchanged, which are the same as in Embodiment 2. In the structure of this embodiment, the lengths of the horizontal bodies are a=90nm, 120nm, and 150nm, and d=50nm.

[0085] The transmission spectrum of the micro-nano metal structure that realizes asymmetric transmission prepared in this example Figure 9 As shown, the conversion rate of the asymmetric transmission of the micro-nano metal structure that realizes the asymmetric transmission of the present embodiment is as follows Figure 10 shown.

[0086] Will Figure 9 , Figure 10 with the comparative example 2 Figure 4 , Figure 5 By comparison, it can be seen that after changing the parameter a, when a=90 nm, when the wavelength λ=1100 nm, the conversion rate of asymmetric transmission AT=6.7%; a=120 nm, when the wavelength λ=1290 nm, The conversio...

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Abstract

The invention relates to a micro-nano metal structure for asymmetric transmission and a preparation method thereof. The structure is composed of a number of periodic units with the same structure, wherein the periodic units are connected up and down and left and right. All periodic units are located in the same plane. Each periodic unit comprises a structural unit. Each structural unit comprises atransverse body I, a transverse body II, a transverse body III, a transverse body IV and a vertical body, wherein the transverse body I, the transverse body II, the transverse body III and the transverse body IV are arranged in order from top to bottom and are perpendicularly connected with the vertical body. The transverse bodies are equally spaced and parallel to each other. The left top ends of each transverse body I and each transverse body II are connected with a vertical body, and are distributed on the right side of the vertical body. The right top ends of each transverse body III andeach transverse body IV are connected with a vertical body, and are distributed on the left side of the vertical body. The mode of resonance peak appears on the polarization conversion spectrum. The asymmetry transmission value of the acquired double-F structure is very large, and the maximum value is up to ATmax equal to14.2%. The asymmetry transmission efficiency of the double-F structure is 32times and 40 times larger than the asymmetry transmission efficiency of individual Z-shape and C-shape structures.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave polarization regulation, and specifically relates to a micro-nano metal structure for realizing asymmetric transmission and a preparation method thereof. Background technique [0002] Asymmetric transmission (Asymmetric Transmission, AT) means that the transmission system exhibits different transmission performances for electromagnetic waves incident along different transmission directions. The transmission characteristics here not only refer to transmission, reflection, etc., but also include polarization conversion. Such as figure 1 As shown, for a polarization conversion asymmetric transmission system A, after the left circularly polarized (LCP) incident from the front of the system A passes through the system A, the transmittance of the received right circularly polarized (RCP) for , the transmittance of the left-handed light incident from the back of system A to the right-hand...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L21/02H01L21/62H01Q15/00
CPCH01L21/02697H01L21/62H01Q15/0086
Inventor 王莉王天堃赵文静张中月孙永伟
Owner SHAANXI NORMAL UNIV