Open AccessLow threshold optical bistability in one-dimensional gratings based on graphene plasmonics
Author(s) -
Jun Guo,
Leyong Jiang,
Yue Jia,
Xiaoyu Dai,
Yuanjiang Xiang,
Dianyuan Fan
Publication year - 2017
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.25.005972
Subject(s) - bistability , optical bistability , graphene , materials science , surface plasmon , optics , surface plasmon resonance , plasmon , optoelectronics , grating , resonance (particle physics) , surface plasmon polariton , nonlinear optics , physics , laser , nanotechnology , nanoparticle , particle physics
Optical bistability of graphene surface plasmon is investigated numerically, using grating coupling method at normal light incidence. The linear surface plasmon resonance is strongly dependent on Femi-level of graphene, hence it can be tuned in a large wavelength range. Due to the field enhancement of graphene surface plasmon resonance and large third-order nonlinear response of graphene, a low-threshold optical hysteresis has been observed. The threshold value with 20MW/cm 2 and response time with 1.7ps have been verified. Especially, it is found that this optical bistability phenomenon is angular insensitivity for near 15° incident angle. The threshold of optical bistability can be further lowered to 0.5MW/cm 2 by using graphene nanoribbons, and the response time is also shorten to 800fs. We believe that our results will find potential applications in bistable devices and all-optical switching from mid-IR to THz range.