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Adjustable graphene terahertz frequency selector

A technology of graphene terahertz and frequency selection, which is applied in the field of graphene terahertz frequency selectors, can solve problems such as poor absorption performance, unfavorable application, and complex design

Active Publication Date: 2020-10-23
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metamaterial electromagnetic absorbers usually face defects such as limited bandwidth or complex design and manufacturing processes, and the absorption frequency bandwidth is insufficient and the absorption performance is poor, which is not conducive to practical applications.

Method used

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  • Adjustable graphene terahertz frequency selector
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  • Adjustable graphene terahertz frequency selector

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Embodiment 1: an adjustable graphene terahertz frequency selector, comprising a gold layer 1 and a silicon dioxide layer 2 with a square cross section stacked successively from bottom to top; the surface of the silicon dioxide layer 2 is provided with graphite Graphene resonant structure 3, said graphene resonant structure 3 comprises 3 layers of stacked square rings 4 made of graphene material, each edge of the square ring 4 is provided with a vertically outward square block 5 respectively. The silicon dioxide layer 2 has a thickness of 10 μm, a width of 2 μm, a dielectric constant of 3.9, and a loss tangent of 0.0006. The silicon dioxide layer 2 has a thickness of 10 μm, a width of 2 μm, a dielectric constant of 3.9, and a loss tangent of 0.0006. The gold layer 1 has a thickness of 0.1 μm and a width of 2 μm. The thickness of the square ring 4 is 0.3 nm, the outer side length of the square ring is 1.8 μm, the inner side length is 1.2 μm, and the width is 0.3 μm. The...

Embodiment 2

[0020] Embodiment 2: on the basis of embodiment 1, as Figure 5 As shown, the middle part of the inner edge of the square ring 4 is respectively provided with a wave-shaped topological boundary 6; the inner four corners of the square ring 4 are respectively provided with a lattice of transmission holes 7, and the lattice of transmission holes at each corner 7 is in the shape of a regular triangular matrix; an array grid is formed between the four transmission hole lattices 7, and the two polarization states based on the in-phase and anti-phase of the terahertz wave are superimposed on each other to obtain a spin state through the above-mentioned junction. The topological phase transition can be generated in the structure of the square ring 4, so as to obtain better robustness. The applicant compared the selector in Example 2 with the selector in Example 1 to test the absorption rate of terahertz. After testing, compared with the absorption effect in Example 1, in Example 2 Th...

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Abstract

The invention discloses an adjustable graphene terahertz frequency selector, which comprises a gold layer and a silicon dioxide layer which are sequentially stacked from bottom to top, wherein the cross section of the gold layer and the cross section of the silicon dioxide layer are square; the surface of the silicon dioxide layer is provided with a graphene resonance structure, the graphene resonance structure comprises a plurality of layers of stacked square rings, and the middle part of each edge of each square ring is respectively provided with a vertically outward square block. The adjustable graphene terahertz frequency selector has excellent absorption performance on terahertz waves, and can realize regulation and control of absorption peaks and absorption frequency.

Description

technical field [0001] The invention relates to the technical field of microwave absorbers, in particular to an adjustable graphene terahertz frequency selector. Background technique [0002] Terahertz (THz) waves are electromagnetic waves located between microwaves and far-infrared rays, and are a type of broadband light. In recent years, with the development of ultrafast laser technology, the generation of terahertz pulses has a stable and reliable excitation light source, which has enabled people to study terahertz. The advantages of terahertz waves are extremely significant in today's rapid social development, so it has attracted extensive research attention. Metamaterial electromagnetic absorbers are a type of components that can effectively absorb electromagnetic waves and make them used in subsequent processes. By designing the surface array unit structure of metamaterial electromagnetic absorbers, precise control of electromagnetic waves can be achieved. The precis...

Claims

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Application Information

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IPC IPC(8): H01Q17/00G02B5/00
CPCH01Q17/008G02B5/003
Inventor 徐弼军闫梦瑶孙志超吴白瑞程盼吴震东
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY