Meta-surface terahertz broadband absorber with metal-medium-graphene structure

Abstract

The invention discloses a metasurface terahertz broadband absorber of a metal dielectric graphene structure. The broadband absorber comprises a metal reflection layer, an intermediate medium interlayer and a patterned graphene structure. The patterned graphene structure comprises a plurality of metasurface patterned graphene periodic units; the plurality of metasurface patterned graphene periodicunits are periodically arranged on the upper surface of the intermediate medium interlayer to form a coplanar layer, and the metal reflecting layer is tightly attached to the lower surface of the intermediate medium interlayer; the terahertz plane wave light source vertically irradiates the patterned graphene structure to obtain a section of absorption broadband, broadband absorption is achieved,the Fermi level of graphene in the patterned graphene structure is adjusted by changing the side end gate voltage, and the Fermi level of graphene is changed under the condition that the side end gatevoltage is powered on; therefore, the dynamic adjustment of the absorption level based on the graphene broadband absorber is realized. The invention has the characteristics of wide absorption bandwidth, wide-angle incidence, adjustable absorptivity and the like.

Description

technical field [0001] The invention relates to the field of optical devices based on a metal-medium-graphene structure metasurface, in particular to a metal-medium-graphene structure metasurface terahertz broadband absorber. Background technique [0002] In recent years, terahertz (THz) waves are located between microwaves and infrared light in the electromagnetic spectrum. Due to its important research value and broad development prospects in communication, imaging, sensing detection and spectroscopy, it has attracted great attention from researchers. Nowadays, with the in-depth research on terahertz technology, the demand for terahertz photonic devices such as filters, polarization converters, absorbers, etc. is becoming more and more urgent. Among these photonic devices, terahertz absorbers are also receiving more and more attention because of their great research value and potential applications. However, once the characteristics of the existing traditional absorbers ...

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Problems solved by technology

However, once the characteristics of the existing traditional absorbers are determined, they are non-tunable, which greatly hinders their application in society (Kim J, Han K, Hahn J W, et al. Selective dual-band metamaterial perfect absorber for infrared stealthtechnology.(Scientific Reports)Landy N I,Sajuyigbe S,Mock J J,et al.Perfect Metamaterial Absorber.(Physical Review Letters)Liu N,Mesch M,Weiss T,etal.Infrared perfect absorber and its application as plasmonic sensor.[J].(Nano Letters))

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