Adjustable ultra-wideband terahertz absorber based on metal and graphene

Abstract

The invention relates to the field of wave absorbers, and concretely relates to an adjustable ultra-wideband terahertz absorber based on metal and graphene. The absorber comprises an ideal electric conductor layer, a dielectric layer and a bimetallic ring which are sequentially arranged from bottom to top, a graphene layer is arranged in the dielectric layer, and the bimetallic ring is composed of a first metal ring and a second metal ring which are concentric. The surface conductivity of the graphene changes along with the Fermi level, and when the chemical potential of the graphene is changed, the broadband adjustability can be realized, so that the purpose of tunable absorption is achieved; and the bimetallic ring and the graphene layer are combined to design the metamaterial wave absorber, so that the metamaterial wave absorber not only has the high absorptivity of a metal metamaterial wave absorber, but also has the regulation characteristic of a graphene metamaterial, and has the characteristic of broadband high absorption. The structure is simple, and electromagnetic wave absorption of other wave bands can be realized through scale transformation of the size.

Description

technical field [0001] The invention relates to the field of wave absorbers, in particular to an adjustable ultra-wideband terahertz absorber based on metal and graphene. Background technique [0002] Metamaterials have electromagnetic properties that surpass those of natural materials. They are the most influential new materials after polymer materials and nanomaterials. They are the basis for realizing perfect lenses and optical devices such as negative refractive index. Extensive attention from domain experts. However, the perfect absorber is an important branch of metamaterials. Since Landy et al. first proposed thin and nearly perfect wave-absorbing metamaterials in 2008, metamaterial absorbers (MAs) have begun to flourish. Due to the difficulty of finding strong frequency-selective THz absorbers, MAs have attracted much attention in the THz band. [0003] Terahertz refers to 0.1GHz-10THz. Terahertz has high frequency, short pulse, high time-domain spectrum signal-to...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing wave absorber cannot obtain the effect of high absorption and high modulation depth, and there is a problem of narrow bandwidth. In order to solve this problem, the present invention provides an adjustable ultra-wideband based on metal and graphene Terahertz absorber, which can achieve broadband tunability, so as to achieve the purpose of tunable absorption, and also has the characteristics of broadband high absorption

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