Numerical Study of the Efficiency of Modulation of Terahertz Waves Transmitted through a Graphene Metasurface under Combined Electric- and Magnetic-Field Control

Using the MWS CST software, a model of graphene metasurfaces under combined electric- and magnetic-field control, which includes the graphene complex permittivity tensor, has been developed and diffraction of a TEM wave normally incident onto a graphene nanoribbon metasurface in a dc magnetic field applied perpendicular to graphene has been simulated. The frequency dependences of the absolute value of the coefficient of transmission of the p-polarized TEM wave through the graphene nanoribbon metasurface have been calculated for different magnetic field inductions В0 and Fermi levels Ef in the THz and far-infrared frequency ranges. It is shown that the frequency modulation index and maximum changes in the coefficient of transmission through the graphene metasurface increase with an increase in the magnetic field induction В0 and a decrease in the graphene Fermi level Ef within the optimum range of 0.2‒0.35 eV at the THz frequencies.