Analytical method for designing tunable terahertz absorbers with the desired frequency and bandwidth | Zendy

Zhongmin Liu | Zendy; Liang Guo | Zendy; Qingmao Zhang | Zendy

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Analytical method for designing tunable terahertz absorbers with the desired frequency and bandwidth

Author(s) -

Zhongmin Liu,

Liang Guo,

Qingmao Zhang

Publication year - 2021

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.442425

Subject(s) - terahertz radiation , narrowband , bandwidth (computing) , broadband , optics , wideband , materials science , optoelectronics , impedance matching , graphene , center frequency , electrical impedance , physics , computer science , band pass filter , telecommunications , quantum mechanics , nanotechnology

We present a novel and effective approach for designing and analyzing graphene metasurface-based terahertz absorbers with the desired central frequency and fractional bandwidth. Narrowband and broadband absorbers are designed using the same configuration with a single-layer of graphene ribbons deposited on a metal-backed dielectric film. An analytical circuit model derived for the graphene array applies the impedance matching concept to realize the desired terahertz absorber. Absorbers with a fractional bandwidth ranging from 10-100% are realized at the 1-THz central frequency. The results show excellent agreement with those calculated using full-wave numerical simulations. The proposed method is promising for terahertz imaging, sensing, and filtering applications.

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