Three- dimensional Gaussian beam with circular cross section scattered from double-periodic magneto-dielectric slab at an arbitrary angle of incidence

A beam with launched field profile having Gaussian form is a good approximation for field distribution of HE11 mode which is the base oscillation type in quasi-optical hollow dielectric waveguides [1]. The beam scattering from layered structures can be studied by using the complex-source-point method [2]. Paraxial approximation is employed, when beam energy is assumed to be distributed in small angular domain [3]. In this paper we use the standard method of plane-wave Fourier spectrum representation [4] for simulation of propagation and interaction of 3-D beam with a scattering structure.