Broadband adjustable wave absorber based on graphene

Abstract

The invention discloses a broadband adjustable wave absorber based on graphene, which comprises a plurality of structural units, wherein each unit structure comprises a metal substrate, a dielectric isolation layer and a graphene layer, the dielectric isolation layer is arranged at the upper end of the metal substrate, the graphene layer is arranged at the upper end of the dielectric isolation layer, a square groove is formed in the graphene layer, the square groove extends into the dielectric isolation layer, and a square graphene sheet is arranged at the upper end of the bottom of the squaregroove; and the Fermi level of the graphene is adjusted by controlling the external voltage (bias voltage), so that the optical response of the graphene is changed, and the absorptivity of the wave absorber is changed. The broadband adjustable wave absorber has the advantages of simple structure, high absorptivity, simple control principle and the like.

Description

technical field [0001] The invention relates to the field of terahertz technology, in particular to a graphene-based broadband adjustable absorber. Background technique [0002] Terahertz waves generally refer to electromagnetic waves with frequencies ranging from 0.1 to 10 THz, which are located between infrared waves and microwaves. Because terahertz wave has many unique properties, such as transient, broadband, low-energy, coherence, etc., it is very important in the fields of basic research, industrial application, medicine, military, biology and communication. application prospects. At present, terahertz wave generation source and terahertz wave detection are recognized as two key issues restricting the development of terahertz technology. The absorption and energy capture of terahertz waves is the basis for terahertz detection, and it is also the core issue of terahertz wave calibration, regulation, conversion and application. Therefore, terahertz broadband absorbin...

AI Technical Summary

Problems solved by technology

However, although the traditional metamaterial absorber can effectively adjust its working performance by changing its own structural size, once the structure is fabricated, it is difficult to change, which cannot meet the growing demand for flexibility.

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