Light scattering of a coated spherical particle with large absorption in Debye series expansion

Abstract

Abstract Debye series expansion (DSE) of a coated sphere is reorganized by three numbers of (N, M, X), in which N is the total number of reflections, M is the number of reflections on the outer interface, and X is the number of chords in the core. With this reorganization, for a coated particle with highly absorbing core, DSE terms can be given by just one number of M, i.e., M = − 1 , 0 , 1 , 2 … , in which M = − 1 term represents the sum of diffraction and external reflection. We find that the overall scattered light is mainly composed of the first three terms, and the coating size that makes M = 0 and M = 1 terms greatly enhanced is proportional to the core size, demonstrating coating size has important effects on intensity distributions of the two terms.