Results of theoretical investigation of the cross-polarization conversion of terahertz (THz) radiation by the graphene metasurface formed by a periodic array of graphene nanoribbons located at the surface of a high-refractive-index dielectric substrate are presented. Giant polarization conversion at the plasmonresonance frequencies takes place without applying external DC magnetic field. Pumping graphene by its direct optical illumination or diffusion pumping allows for compensating the Drude losses in grapheneand leads to further enhancement of the polarization conversion. It is shown that the total polarizationconversion can be achieved in the total internal reflection regime of THz wave from the graphenemetasurface at room temperature.
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