title: Low threshold optical bistability in one-dimensional gratings based on graphene plasmonics.
abstract: 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/cm2and 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/cm2by 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.
authors.forename: Jun
authors.initials: J
authors.lastname: Guo
authors.forename: Leyong
authors.initials: L
authors.lastname: Jiang
authors.forename: Yue
authors.initials: Y
authors.lastname: Jia
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Dai
authors.forename: Yuanjiang
authors.initials: Y
authors.lastname: Xiang
authors.forename: Dianyuan
authors.initials: D
authors.lastname: Fan