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

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arxiv 1908.06696 v2 pith:X3FDCRFC submitted 2019-08-19 physics.app-ph

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

Anna C. Tasolamprou , Anastasios D. Koulouklidis , Christina Daskalaki , Charalampos P. Mavidis , George Kenanakis , George Deligeorgis , Zacharias Viskadourakis , Polina Kuzhir
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Stelios Tzortzakis Eleftherios N. Economou Maria Kafesaki Costas M. Soukoulis
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classification physics.app-ph
keywords grapheneflatultrafastmodulationmodulatorsheetabsorberabsorption
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We present the experimental and theoretical study of an ultrafast graphene based thin film absorption modulator for operation in the THz regime. The flat modulator is composed of a graphene sheet placed on a dielectric layer backed by a metallic back reflector. A near IR pulse induces the generation of hot carriers in the graphene sheet reducing effectively its conductivity. The system provides a platform with ultrafast modulation capability for flat optics and graphene based metasurfaces applications.

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