The direct scattering problem of obliquely incident electromagnetic waves by a penetrable homogeneous cylinder

TL;DR

This paper investigates the electromagnetic scattering by a homogeneous dielectric cylinder, proving mathematical properties and developing a numerical scheme for accurate simulation of oblique wave incidence.

Contribution

It introduces a new integral equation formulation for the problem and applies a collocation method for efficient numerical solutions.

Findings

Proved uniqueness and existence of the solution.

Developed a boundary integral equation approach.

Provided accurate numerical results for test cases.

Abstract

In this paper we consider the direct scattering problem of obliquely incident time-harmonic electromagnetic plane waves by an infinitely long dielectric cylinder. We assume that the cylinder and the outer medium are homogeneous and isotropic. From the symmetry of the problem, Maxwell's equations are reduced to a system of two 2D Helmholtz equations in the cylinder and two 2D Helmholtz equations in the exterior domain where the fields are coupled on the boundary. We prove uniqueness and existence of this differential system by formulating an equivalent system of integral equations using the direct method. We transform this system into a Fredholm type system of boundary integral equations in a Sobolev space setting. To handle the hypersingular operators we take advantage of Maue's formula. Applying a collocation method we derive an efficient numerical scheme and provide accurate numerical results using as test cases transmission problems corresponding to analytic fields derived from fundamental solutions.