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Graphene-based terahertz double-band wave absorber adjusting method

A wave absorber and graphene technology, which is applied in the field of terahertz metamaterial wave absorption, can solve the problems of combination difficulties and hinder practical applications, and achieve the effects of simple and compact structure, easy large-scale integration, and good absorption effect.

Active Publication Date: 2019-03-01
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Although multi-band or broadband and tunable absorption behavior are highly desirable, combining these two properties is a very difficult task, which greatly hinders their practical application

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Embodiment Construction

[0019] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] The present invention designs a method of a graphene-based terahertz dual-band adjustable absorber, and the specific implementation methods include:

[0021] figure 1 Schematic diagram of a graphene-based dual-band absorber. The metal layer 1 with a period of p and a thickness of t1 is used as the reflective substrate, the intermediate dielectric layer 2 is made of silicon dioxide, the top layer of graphene layer 3 is a single-layer structure, the horizontal period and the vertical period are both p, and the radius of the circular graphene is R, monolayer graphene thickness is 1 nm. The metal layer can be a good conductor such as gold or silver, where the thickness of the metal should be much greater than its skin depth in the terahertz band, and 0.2 μm is selected as its thickness.

[0022] The present invention designs a reflecti...

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Abstract

The invention discloses a graphene-based terahertz double-band wave absorber adjusting method, belongs to the field of terahertz metamaterial wave absorption, and aims at realizing perfect absorptionin terahertz double-band and changing wave absorption bands through changing chemical potential of graphene. According to the method, a designed wave absorber unit comprises a layer of full-metal film(1), a layer of dielectric film (2) and a layer of patterned graphene (3) from bottom to top, wherein the three layers are mutually laminated; the metal film layer adopts a conductor of gold or silver; and the intermediate dielectric layer uses silicon dioxide. Analog computation is carried out through a finite element method, and a reflection spectrum of the structure is observed to realize perfect absorption in in terahertz double-band. The metasurface wave absorber has the advantages of being strong in absorption, insensitive in polarization, simple in structure and convenient to process;and due to the Fermi-level adjustability, the dynamic adjustability of resonant frequency of the wave absorber can be realized, and the requirements for application in the terahertz absorption aspectcan be satisfied.

Description

(1) Technical field [0001] The invention designs a graphene-based method for a terahertz dual-band adjustable wave absorber, which belongs to the field of terahertz metamaterial wave absorption. The structure of the absorber can realize dual-band absorbing, adjustable absorbing frequency band, polarization insensitivity and other characteristics, and can be used in terahertz band light source, sensor design and other aspects. (2) Background technology [0002] Metamaterial perfect absorbers (MPAs) with subwavelength scales have attracted widespread interest. Currently MPAs have been widely studied and applied in bolometers, chemical and biomedical sensing, photodetectors, photothermal conversion, etc., and many types of MPAs have been proposed. One of the hottest research directions in this field is to realize tunable MPAs because of their great flexibility in practical applications. Currently, most designs focus on absorbing intensity modulation rather than resonant frequ...

Claims

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Application Information

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IPC IPC(8): H01Q17/00
CPCH01Q17/00
Inventor 陈明陈晨刘厚权王崇云赵德平高文文张文波苑立波
Owner GUILIN UNIV OF ELECTRONIC TECH
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