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) Equivalent current models. Here, R_S and R_D are considered as contact resistances in the source and drain electrodes, respectively. Graphene channel resistance is regarded as two parts close to the source and drain electrodes. Both resistances are set equally to calculate easily, and C_x and R_G are the top-gate capacitance and resistance, respectively. (a) Output-character measurement model. (b) Leak current measurement model. Panels (c) and (d) are transfer-characters measurements for positive and negative voltage, respectively.