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We present the experimental and theoretical study of an ultrafast graphenebased thin film absorption modulator for operation in the THz regime. The flatmodulator is composed of a graphene sheet placed on a dielectric layer backedby a metallic back reflector. A near IR pulse induces the generation of hotcarriers in the graphene sheet reducing effectively its conductivity. Thesystem provides a platform with ultrafast modulation capability for flat opticsand graphene based metasurfaces applications.

Ultrafast modulation in a THz graphene-based flat absorber through negative photoconductivity