Broadband adjustable terahertz wave absorber based on graphene

Abstract

The invention discloses a broadband adjustable terahertz wave absorber based on grapheme. Metal is used as a reflecting substrate, an insulating dielectric layer and a graphene layer are sequentiallyarranged upwards in structure, and the graphene layer is composed of a regular single-layer graphene square sheet structure. Because the graphene shows strong metallicity in infrared and terahertz bands, the graphene structure is directly used as a resonance structure unit, and local surface plasma resonance is combined with surface plasma resonance of the graphene structure to realize the broadband wave absorber with a single-layer structure, so that the processing technology of the structure is greatly simplified. Due to the unique electrical characteristics of the graphene, the chemical potential and the surface conductivity of the graphene can be changed through change of the external bias voltage, so that the broadband strong absorption of incident terahertz waves is adjusted in a wide range. The terahertz wave absorber is simple in structure and high in absorption efficiency, and has important application prospects in the fields of terahertz imaging, spectra, invisibility and thelike.

Description

technical field [0001] The invention relates to the technical field of terahertz, in particular to a graphene-based broadband adjustable terahertz wave absorber. The absorber structure can realize the characteristics of broadband absorption, wide-range adjustment of absorption rate of broadband terahertz wave, wide-angle broadband absorption and polarization unknown. It can be used for terahertz detection in terahertz band, terahertz imaging, and Hertz stealth and so on. Background technique [0002] Terahertz (Terahertz) waves generally refer to electromagnetic waves with a frequency in the range of 0.1 to 10 THz, between the infrared band and the microwave band, and in the cross-field of electronics and photonics research. Terahertz waves have unique properties such as broadband, low energy, and coherence, making them have great application prospects in medical imaging, sensor detection, security inspection, radar, and communications. At present, terahertz wave generatio...

AI Technical Summary

Problems solved by technology

However, most current graphene-based absorbers use periodic independent disks, cross-shaped, strip-shaped or other graphene arrays, resulting in a narrow bandwidth for perfect absorption of incident electromagnetic waves, which greatly limits their performance in terahertz. Therefore, it is of great interest to seek a new type of terahertz broadband absorber with simple structure, adjustable characteristics, and easy regulation.

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