Abstract The aim of this work is a numerical study of the features of magnetoplasmonic effects arising from the diffraction of THz waves on graphene metasurfaces in external magnetic fields. The advantage of graphene over conventional plasmonic materials used in plasmonic and magnetooptical devices is the high sensitivity of surface magnetoplasmon–polaritons to external magnetic fields since the cyclotron frequency is comparable to the plasmon frequency in the THz and far IR ranges. Numerical study of magnetoplasmonic resonances of graphene metasurfaces depending on the induction of an external magnetic field and modeling of 3D e-Field scattering patterns from an element of a graphene metasurface (rectangular graphene nanoribbon) has been carried out using the CST MWS software package. To solve the electrodynamic diffraction problem using MWS CST, a method has been chosen to analyze a graphene metasurface (an infinite periodic 2D structure) by applying periodicity conditions that reduce the problem for an infinite structure to analysis of one period. The results of modeling the 3D e-Field scattering pattern from an element of a magnetically biased graphene metasurface (a rectangular graphene nanoribbon) of incident TEM-waves of p- and s-polarization have been obtained for the vertical Ey and horizontal Ex components of the diffracted field at magnetoplasmon resonance frequencies in the THz range. Analysis of magnetoplasmonic effects has been performed based on the calculation of the ratio of the diffracted field components and the axial ratio at the points of cross section (φ = 0°) of the main lobe of the 3D e-Field scattering pattern for the normal incidence of TEM-waves of p- and s-polarization. The results of the numerical study of the performances of the magnetically biased graphene metasurfaces show that magnetoplasmonic effects are observed at resonance frequencies; i.e., there appears of another component of the diffracted field, which is orthogonal to the exciting one, as well as the magnetooptical effects of rotation of the polarization plane of the transmitted wave (Faraday effect), rotation of the polarization plane and the emergence of ellipticity of a linearly polarized wave during its reflection from the graphene surface (magnetooptical Kerr effect), depending on the magnitude of the external magnetic field.

Magnetoplasmonic Effects Induced by Diffraction of Terahertz Waves on Magnetically Biased Graphene Metasurfaces

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发表日期：

2025年6月1日

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G. S. Makeeva,
M. S. Nikitin

摘要

Abstract

The aim of this work is a numerical study of the features of magnetoplasmonic effects arising from the diffraction of THz waves on graphene metasurfaces in external magnetic fields. The advantage of graphene over conventional plasmonic materials used in plasmonic and magnetooptical devices is the high sensitivity of surface magnetoplasmon–polaritons to external magnetic fields since the cyclotron frequency is comparable to the plasmon frequency in the THz and far IR ranges. Numerical study of magnetoplasmonic resonances of graphene metasurfaces depending on the induction of an external magnetic field and modeling of 3D e-Field scattering patterns from an element of a graphene metasurface (rectangular graphene nanoribbon) has been carried out using the CST MWS software package. To solve the electrodynamic diffraction problem using MWS CST, a method has been chosen to analyze a graphene metasurface (an infinite periodic 2D structure) by applying periodicity conditions that reduce the problem for an infinite structure to analysis of one period. The results of modeling the 3D e-Field scattering pattern from an element of a magnetically biased graphene metasurface (a rectangular graphene nanoribbon) of incident TEM-waves of p- and s-polarization have been obtained for the vertical E_y and horizontal E_x components of the diffracted field at magnetoplasmon resonance frequencies in the THz range. Analysis of magnetoplasmonic effects has been performed based on the calculation of the ratio of the diffracted field components and the axial ratio at the points of cross section (φ = 0°) of the main lobe of the 3D e-Field scattering pattern for the normal incidence of TEM-waves of p- and s-polarization. The results of the numerical study of the performances of the magnetically biased graphene metasurfaces show that magnetoplasmonic effects are observed at resonance frequencies; i.e., there appears of another component of the diffracted field, which is orthogonal to the exciting one, as well as the magnetooptical effects of rotation of the polarization plane of the transmitted wave (Faraday effect), rotation of the polarization plane and the emergence of ellipticity of a linearly polarized wave during its reflection from the graphene surface (magnetooptical Kerr effect), depending on the magnitude of the external magnetic field.