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Dynamic tunable wave absorber based on metal graphene metamaterial

A metal graphite and metamaterial technology, applied in electrical components, antennas, etc., can solve the problems of less absorption frequency band, complex structure, and inability to achieve real-time tuning, and achieve the effect of real-time tuning

Inactive Publication Date: 2019-04-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By controlling the applied voltage of different graphene layers, the independent real-time adjustment of the absorption characteristics can be realized, and the absorption rate is more than 90%. By changing the number of rectangular metal artificial microstructures in the unit structure and the graphene-metal The number of metamaterial layers can flexibly realize multi-frequency absorption; through horizontal arrangement, broadband absorption effect can be realized, and the absorption bandwidth can reach 11.8THz, thus overcoming the existing structure of some existing electromagnetic metamaterial absorbers based on PIT principle Complicated, less absorption frequency band, narrow absorption bandwidth, poor absorbing effect, unable to achieve independent real-time tuneability, etc.

Method used

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  • Dynamic tunable wave absorber based on metal graphene metamaterial
  • Dynamic tunable wave absorber based on metal graphene metamaterial
  • Dynamic tunable wave absorber based on metal graphene metamaterial

Examples

Experimental program
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Effect test

Embodiment 1

[0034] When the P-polarized wave is incident, the single-layer graphene-metal metamaterial unit structure, the absorber absorption spectrum changes with the lower graphene Fermi level, that is Figure five The data changes in , when only one metal arm is included, the lengths of the upper and lower metal arms are 2.4 μm and 3.2 μm respectively, the Fermi energy level of the upper graphene remains unchanged at 0.15eV, and the Fermi energy level of the lower graphene is 0.15eV respectively , 0.3eV and 0.6eV. Different from the traditional PIT effect, which is the coupling effect of bright mode components and dark mode components, both long metal strips and short metal strips behave as bright mode components, and the two absorption peaks are the simple composite effect of two bright mode components. Depend on Figure five It can be clearly seen that with the continuous increase of the Fermi level of the lower graphene, the position of the low-order absorption peak is blue-shifte...

Embodiment 2

[0036] When the P-polarized wave is incident, the three-band absorber and the four-band absorber are realized, and the graphene Fermi level is fixed at 0.15eV, that is Figure six The values ​​shown vary. Simultaneously combine Figure four On the basis of the double-layer metamaterial absorber structure shown, more absorption bands can be obtained by continuing to increase the number of metamaterial layers. The black square curve is the absorption spectrum of the three-band absorber. The absorber is composed of a three-layer graphene-metal metamaterial structure. Each layer of metamaterial unit structure contains only one metal arm. The lengths of the upper, middle and lower single-layer metal arms are respectively: 2.4μm, 2.8μm, 3.2μm, the corresponding absorption peak frequencies of the three frequency bands are: 39.4THz, 31.8THz, 28.6THz; no change Figure four For the number of metamaterial layers shown, when the number of metal strips in the unit structure increases fr...

Embodiment 3

[0038] combine Figure seven The absorption band bandwidth shown varies with the arm length, and the graphene Fermi level is fixed at 0.15eV. The structure consists of two layers of graphene-metal metamaterial structure, and each layer of metamaterial unit structure contains two laterally arranged metal arms. The lengths l1 and l2 of the upper two metal arms are respectively: 2.7 μm and 3.05 μm, and the lengths l3 and l4 of the lower metal arms are respectively: 3.15 μm and 3.4 μm; when the length of the metal arm l1 decreases in turn, they are respectively: 2.65 μm, 2.6 μm, 2.55μm. by right Figure seven The data analysis in can be known that when the absorber broadband gradually increases, the flatness of the absorption band weakens in turn, and when the length of the metal arm is 2.55μm, the absorber absorption rate is above 50% and the broadband can reach 11.8THz.

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Abstract

The invention relates to the technical field of metamaterial application, and discloses a dynamic tunable wave absorber based on a metal graphene metamaterial. The wave absorber comprises a metal substrate layer, a dielectric insulating layer, a metamaterial layer and an upper metal electrode, wherein the dielectric insulating layer, the metamaterial layer and the upper metal electrode are sequentially distributed at the top of the metal substrate layer from bottom to top. The metamaterial layer is composed of graphene and metal unit structures which are periodically arranged, wherein the metamaterial unit structures are rectangular metal artificial microstructures, and the metamaterial layer is of an upper-lower layer structure. The wave absorber can achieve the independent real-time adjustment of wave-absorbing characteristics by controlling external voltages of different graphene layers; through changing the number, the combination mode and the graphene-graphene artificial microstructures in the unit structure, the wave absorber can flexibly achieve the multi-frequency absorption, and achieves the multi-frequency and ultra-wideband absorption multi-frequency absorption which canbe independently tuned in real time at the mid-infrared band.

Description

technical field [0001] The invention relates to the technical field of metamaterial applications, in particular to a dynamically tunable wave absorber based on metal graphene metamaterials. Background technique [0002] Artificial electromagnetic metamaterial is an artificial electromagnetic medium composed of subwavelength artificial unit structures arranged according to certain rules. Since the size of the artificial unit is much smaller than the working wavelength, it is a material with uniform properties relative to the working wavelength. The advantage of metamaterials is that the electromagnetic parameters of materials can be controlled by adjusting the structure, size, and distribution of artificial units, so as to obtain a variety of novel electromagnetic properties, which are not available or difficult to achieve in natural substances. The most commonly used artificial units constituting metamaterials include finite-length lines and split-ring resonators. The comb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00H01Q15/00
CPCH01Q15/0086H01Q17/00H01Q17/002
Inventor 钟任斌刘燕黄捷彪吕奕霖韩晨刘盛纲
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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