Grapheme terahertz multifrequency absorber based on metal helical microstructure

An ene terahertz and microstructure technology, which is applied in the field of terahertz wave absorption, can solve the problems of low absorption rate, low absorption frequency band, small frequency range, etc., and achieve the effect of high absorption rate, enhanced absorption rate and enhanced absorption.

Inactive Publication Date: 2019-03-22
XIAMEN UNIV
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Problems solved by technology

[0003] In order to solve the problems of the graphene wave absorber in the prior art, such as less absorption frequency band, smaller frequency range, and low absorption rate, the purpose of the present invention is to provide a multi-band and high-absorption based Graphene terahertz multi-frequency absorber with metal helical microstructure

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  • Grapheme terahertz multifrequency absorber based on metal helical microstructure
  • Grapheme terahertz multifrequency absorber based on metal helical microstructure
  • Grapheme terahertz multifrequency absorber based on metal helical microstructure

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[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] Such as figure 1 and 2 As shown, the embodiment of the present invention is a four-layer structure device, which has periodicity in the xoy plane, and the period lengths of the unit structure in the x and y directions are L respectively x and L y , the four-layer structure device is as follows from top to bottom: metal helical microstructure layer 1, graphene layer 2, dielectric layer 3 and metal substrate layer 4; the metal helical microstructure layer 1 is composed of Shaped structure of gold, silver and other metal materials; the graphene layer 2 has a thickness of h 2 The single-layer graphene layer is composed of; the dielectric layer 3 is composed of a low dielectric constant material, and the low dielectric constant material is selected from SiO 2 , Topas, ZrO 2 etc.; the material of the metal layer 4 is a good conductor mate...

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Abstract

A graphene terahertz multifrequency absorber based on a metal helical microstructure relates to terahertz wave absorption. The graphene terahertz multifrequency absorber is a four-layer structure device with periodicity in an xoy plane. The period lengths of a cell structure in the x and y directions are Lx and Ly respectively. From top to bottom, the four-layer structure device consists of a metal helical microstructure layer, a graphene layer, a dielectric layer and a metal substrate layer. The metal helical microstructure layer is composed of gold and silver metal materials having an Archimedes helical structure. The graphene layer is composed of a single layer of graphene. The dielectric layer consists of a low dielectric constant material. The material of the metal layer is a good conductor material such as gold or silver, and the thickness of the metal layer is larger than the skin depth of incident waves. The metal helical microstructure layer can effectively enhance the surfaceplasmon resonance effect of grapheme by being placed on the graphene layer. The graphene terahertz multifrequency absorber has high absorptivity of more than 90 percent for multi-band terahertz waveswith an incident angle lower than 25 DEG, and has the angle-independent property.

Description

technical field [0001] The invention relates to a terahertz wave absorber, in particular to a graphene terahertz multi-frequency wave absorber based on a metal helical microstructure. Background technique [0002] Terahertz waves generally refer to electromagnetic waves with a frequency of 0.1-10 THz, corresponding to a wavelength range of 3-0.03 mm, and have broad application prospects in many fields such as broadband communication, spectrum analysis, detection and sensing, biomedicine, and security imaging. In 2008, Landy et al. proposed the concept of a metamaterial perfect absorber in the microwave segment (Phys.Rev.Lett., vol.100, pp.207402, 2008), using electric resonators, short metal wires and dielectric layers to form a perfect absorber At present, due to the wide application of microwave absorbers, the research field has continuously expanded from microwave frequency bands to terahertz frequency bands, infrared bands, and visible light bands. The sub-wavelength me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q17/00G02B5/00
CPCG02B5/003H01Q17/00H01Q17/008
Inventor 叶龙芳曾芳韩峰刘颜回江晗柳清伙
Owner XIAMEN UNIV
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