All-optical controlling based on nonlinear graphene plasmonic waveguides.
We give the effective refractive index of graphene plasmonic waveguides with both linear and nonlinear effects based on the nonlinear cross-phase modulation, and address the effects of photo-induced refractive index change and absorption change. A non-resonant all-optical nonlinear graphene plasmonic switch with an ultra-compact size of 0.25 μm2is proposed and numerically analyzed based on the dynamics of the photo-induced absorption change. The results show that the all-optical graphene plasmonic switch can realize a broad bandwidth over 5 THz, a potentially very high switching speed and an extinction ratio of 18.14 dB with the electric amplitude of the pump light of 1.5 × 107V/m at the signal frequency of 28 THz. Our study could provide a possibility for future all-optical highly integrated optical components.
Jian
J
Li
Jin
J
Tao
Zan Hui
ZH
Chen
Xu Guang
XG
Huang