Nystrom technique analysis of the terahertz and infrared range radar cross section of a circular dielectric cylinder with graphene strips inside.

We study the modification of the radar cross section (RCS) of a circular dielectric cylinder with coplanar graphene strips inside, focusing on the variation of the chemical potential and the excitation of associated plasmon resonances. The scattering and absorption of the H-polarized plane wave in the THz and infrared frequency range, up to 55 THz, are considered. The mathematically grounded method of hyper-singular integral equations and the meshless Nystrom-type algorithm are used. The reduction of RCS is essential in stealth technologies. At the same time, the increase of RCS with the help of radar enhancers is also important and used in marine and air safety applications, making small boats, coastal structures or aircraft more visible for the radar. We show that RCS of the studied scatterer is tunable and can be both increased and reduced at the same frequency.This article is part of the theme issue 'Analytically grounded full-wave methods for advances in computational electromagnetics'.