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Figure 11: Photoelectric hybrid tuned THz modulator. (a) Illustration of the GSTD sample. The double-layer graphene on the Si substrate was photoexcited with green light and biased with voltage . (b) Gate voltage-dependent, normalized time-domain transmission peaks of the double-layer graphene on Si. (c). Schematic drawings of working mechanism for the GSS structure. (d) Monolayer graphene deposited on the SRRs with continuous wave laser light excitation and bias voltage Vg. Reproduced from [7577].