Evaluation of the E‐polarization focusing ability in Thz range for microsize cylindrical parabolic reflector made of thin dielectric layer sandwiched between graphene

We consider two-dimensional (2-D) thin dielectric parabolic reflector, covered with graphene from both sides, illuminated symmetrically by an E-polarized electromagnetic plane wave. Our aim is to estimate the focussing ability of such a composite reflector depending on parameters. use version two-side generalized boundary condition, modified for multilayer case. The scattering formulated as boundary-value problem; it cast set two coupled singular integral equations that are further subjected analytical regularisation based known Riemann–Hilbert problem solution. Thanks this procedure, numerical results computed Fredholm second-kind matrix equation guarantees convergence and provides easily controlled accuracy. In lower part THz range, high values focusing observed even reflector; they greater than purely free standing reflector. On other hand, regime almost full transparency, intrinsic layer, can spoil ability. Novel aspect location in frequency effect be controlled, wide changing chemical potential graphene.