Polarization-independent terahertz wave modulator based on graphene-silicon hybrid structure
Du Liang-Liang1, 2, Li Quan2, Li Shao-Xian2, Hu Fang-Rong1, Xiong Xian-Ming1, Li Yan-Feng1, Zhang Wen-Tao1, †, , Han Jia-Guang2, ‡,
       

(a) Measurement schematic diagram, (b) detailed structure, and (c) equivalent model of the proposed structure; (d) distribution of carrier concentration in silicon under DC bias voltage; (e) electron transition under photoexcitation.