Open AccessAnalytical method for designing tunable terahertz absorbers with the desired frequency and bandwidth
Author(s) -
Zhongmin Liu,
Guo Liang,
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.