Dyadic Green´s function for a general anisotropic medium: radiation and scattering of EM waves

This paper deals with radiation and low frequency scattering of electromagnetic waves in a general anisotropic homogeneous medium. The explicit exact form of the four spectral Green´s dyads is obtained and asymptotic expressions for the radiation field due to arbitrary sources are derived, which show that the associated modes and the eigenmodes determine radiation along a singular optic axis. Meanwhile, the analytical solution of low frequency scattering by a small body immersed into an anisotropic medium is developed