Graphene-based terahertz multifunctional metasurface device

The embodiment of the invention provides a graphene-based terahertz multifunctional metasurface device. The graphene-based terahertz multifunctional metasurface device comprises a plurality of metasurface units which are periodically arranged, each metasurface unit comprises a bottom metal reflecting layer, a middle dielectric layer and a top pattern layer which are arranged from bottom to top; the top pattern layer comprises a metal strip and a graphene film layer; when linearly polarized terahertz waves are vertically incident to the metasurface device, the Fermi level of graphene in the graphene thin film layer is changed, so that the graphene thin film layer and the metal strip generate electric dipole resonance, the metal strip and the bottom metal reflecting layer generate electric dipole resonance, the metal strip and incident electromagnetic waves generate strong coupling, and the terahertz waves are emitted to the metasurface device. And efficient absorption and efficient polarization conversion effe