Diffraction Radiation Analysis of Finite Graphene-Covered Nanowire Grating Excited by Electron Beam

The paper considers the infrared diffraction radiation of the particle beam flowing across a finite grating of circular dielectric nanowires with graphene covers. The velocity of the modulated in density electron beam is assumed fixed and the graphene is characterized using the quantum-theory Kubo formalism and the resistive sheet boundary conditions. To reduce the wave-scattering electromagnetic boundary value problem to well-conditioned algebraic equation for the expansion coefficients of the scattered field, we apply the separation of variables in the local coordinates and the addition theorem for the cylindrical functions. Our approach allows to control the numerical accuracy. This study focuses on the resonance effects associated with the plasmon and the lattice-mode resonances. Potential future developments and applications of obtained results are discussed, such as design of dielectric laser accelerator configurations.