THz Waves Scattering by Finite Graphene Strip Grating Embedded Into Dielectric Slab

Abstract

We consider the scattering and absorption of plane H-polarized wave by finite number of graphene strips placed inside a dielectric slab, in the THz range. The problem is reduced to the singular integral equation. Here we obtain two types of singular integrals: Cauchy principal value integral and integral with poles. To eliminate the poles we present the regularization procedure. The theoretically guaranteed convergent Nystrom-type method is used for discretization. Results for the total scattering and absorption cross sections and the near field patterns are presented. We pay special attention to plasmon and gratingmode resonances, as well as excitation of eigenwaves of dielectric slab. These waves carry energy of the incident field along the dielectric slab. Dramatic growth in the power is observed at the grating-mode resonance frequencies.