Scattering from a multilayered chiral sphere: Internal and near fields

Abstract

An iterative method is proposed for dealing with scattering from a multilayered chiral sphere in Lorenz-Mie regime in the authors’ previous work. In this paper the research is extended on the internal fields and near fields. By using four intermediate variables in each region of the multilayered chiral sphere, an iterative relationship of expansion coefficients for calculating internal fields is proposed. Numerical results of internal and near fields for plane wave and Gaussian beam incidence are calculated and analyzed. It is found that amplitudes and distributions of the electric field Eθ and Eφ inside the sphere are significantly affected by chirality parameter and size of each region inside the multilayered chiral sphere. Internal and near fields of a multilayered chiral spherical shell with 50 layers interacting with light wave are calculated and presented. The model could be used to explore the properties of graded index chiral shells or coatings.