A High Quality-Factor Optical Modulator with Hybrid Graphene-Dielectric Metasurface Based on the Quasi-Bound States in the Continuum.
Micromachines (Basel)
; 13(11)2022 Nov 10.
Article
en En
| MEDLINE
| ID: mdl-36363965
ABSTRACT
In this paper, we combine the dielectric metasurface with monolayer graphene to realize a high quality(Q)-factor quasi-BIC-based optical modulator, and the corresponding modulation performances are investigated by using the finite-difference time-domain (FDTD) method, which can be well fitting by the Fano formula based on the temporal couple-mode theory. The results demonstrate that bound states in the continuum (BIC) will turn into the quasi-BIC with high Q-factor by breaking the symmetry of every unit of the metasurface. Meanwhile, the amplitude and bandwidth of transmission based on the quasi-BIC mode can be efficiently adjusted by changing the Fermi energy (EF) of monolayer graphene, and the maximum difference in transmission up to 0.92 is achieved. Moreover, we also discuss the influence of the asymmetry degree to further investigate the modulation effect of graphene on the quasi-BIC mode.
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1
Colección:
01-internacional
Base de datos:
MEDLINE
Idioma:
En
Revista:
Micromachines (Basel)
Año:
2022
Tipo del documento:
Article
País de afiliación:
China
Pais de publicación:
CH
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SUIZA
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SUÍÇA
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SWITZERLAND