Optical response of tunable terahertz plasmon in a grating-gated graphene transistor

Yan Bo^{1, 2, 3}, Fang Jingyue^{2, †}, Qin Shiqiao², Liu Yongtao³, Chen Li¹, Chen Shuang¹, Li Renbing¹, Han Zhen¹

(color online) (a) Transmission spectra of the bare cavity (T₀) and the device with graphene (T). (b) Extinction in transmission, 1 − T/T₀, in the graphene plasmonic device as gate voltage V_G are −0.8, 0, and 0.8. The solid lines are fitting curves. Inset shows partial enlarged details inside the red-dashed box. The maximal transmission extinction is approximately 85%.