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) Reflected and (b) transmitted terahertz time-domain signals from the proposed structure under different photoexcitation powers (0, 100, 200 mW) with zero bias.