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Graphene terahertz absorber with adjustable broadband

A graphene and terahertz technology, applied in the terahertz field, can solve the problems of complex device preparation process, large structural unit size, hindering practical application, etc., to achieve dynamic tunable characteristics, simple and compact structure, and easy large-scale integration. Effect

Inactive Publication Date: 2020-02-14
ANYANG NORMAL UNIV
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Problems solved by technology

Although broadband and tunable absorption behaviors are ideal, they also face some problems: large structural unit size and complicated device fabrication process
These problems greatly hinder their practical application

Method used

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  • Graphene terahertz absorber with adjustable broadband
  • Graphene terahertz absorber with adjustable broadband
  • Graphene terahertz absorber with adjustable broadband

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specific Embodiment approach

[0020] The present invention designs a graphene adjustable broadband terahertz absorber, and the specific implementation method includes:

[0021] figure 1 is a schematic diagram of a graphene-based broadband absorber. A metal layer (1) with a period of p and a thickness of t2 is used as a reflective substrate, the middle dielectric layer (2) is made of silicon dioxide, and the top graphene layer (3) is a single-layer structure. The metal layer can be selected from gold, copper, silver or aluminum, where the thickness of the metal should be much greater than its skin depth in the terahertz band, and t2=0.2 micron is selected as its thickness.

[0022] figure 2 For the top graphene pattern, the length and width of the square graphene are 30 microns, the width of the dug rectangular groove is 4 microns, and the length is 11 microns, and the four rectangular grooves are distributed on the positive and negative axes of the x and y axes , and the coordinate centers are respecti...

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Abstract

The invention discloses a graphene terahertz absorber with an adjustable broadband. The absorber is composed of a plurality of absorber units, each absorber unit is sequentially provided with an all-metal film (1), a dielectric film (2) and patterned single-layer graphene (3) from bottom to top, and the three layers of structures are attached to one another. The reflection spectrum of the structure is observed by calculation adopting a finite element method to achieve the perfect absorption in a terahertz broadband. The graphene terahertz absorber has the advantages of strong absorption, insensitivity to polarization, a simple structure, convenience in processing and the like, and the chemical potential and the surface conductivity of the graphene can be changed by changing external bias voltage due to the unique electrical characteristics of the graphene, so that the broadband strong absorption of incident terahertz waves can be adjusted in a large range, and the application requirements in the aspect of terahertz absorption can be met.

Description

technical field [0001] The invention relates to the technical field of terahertz, in particular to a graphene adjustable broadband terahertz absorber. The absorber structure can realize broadband absorption, the broadband terahertz wave absorption rate can be adjusted, and the characteristics of polarization insensitivity can be used in terahertz detection, imaging, stealth and other aspects. Background technique [0002] Broadband metamaterial perfect absorbers have important application prospects in biosensing, military stealth, photodetectors, light-to-heat conversion, etc., thus attracting widespread attention, and many types of broadband metamaterial perfect absorbers have been proposed . One of the hottest research directions in this field is to realize tunable broadband metamaterial perfect absorbers because of their great flexibility in practical applications. Currently, there are mainly two approaches to design tunable broadband metamaterial perfect absorbers. On...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00H01Q17/00
CPCG02B5/003H01Q17/008
Inventor 胡丹王红燕张进峰
Owner ANYANG NORMAL UNIV
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