Open AccessTerahertz multifunction switch and optical storage based on triple plasmon-induced transparency on a single-layer patterned graphene metasurface
Author(s) -
Enduo Gao,
Hongjian Li,
Zhimin Liu,
Cuixiu Xiong,
Chao Liu,
Banxian Ruan,
Min Li,
Baihui Zhang
Publication year - 2020
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.412061
Subject(s) - graphene , terahertz radiation , materials science , plasmon , optoelectronics , optics , electromagnetically induced transparency , optical storage , optical switch , strips , nanotechnology , physics , composite material
A terahertz metasurface consisting of a graphene ribbon and three graphene strips, which can generate a significant triple plasmon-induced transparency (triple-PIT), is proposed to realize a multifunction switch and optical storage. Numerical simulation triple-PIT which is the result of destructive interference between three bright modes and a dark mode can be fitted by coupled mode theory (CMT). The penta-frequency asynchronous and quatary-frequency synchronous switches can be achieved by modulating the graphene Fermi levels. And the switch performance including modulation depth (83.5% < MD < 93.5%) and insertion loss (0.10 dB < IL < 0.26 dB) is great excellent. In addition, the group index of the triple-PIT can be as high as 935, meaning an excellent optical storage is achieved. Thus, the work provides a new method for designing terahertz multi-function switches and optical storages.