Analysis of Diffraction from a Uniaxial Chiral Slab with a Two-Dimensional Array of Patches

Abstract

Diffraction from a uniaxial chiral slab with a two-dimensional periodic array of conducting patches is analyzed by the 4 × 4 matrix-based approach. Equitorial anisotropy is assumed for the chirality whose optical axis is parallel to the plane of incidence. In the analysis, the total fields are given by the superposition of the current-dependent scattered fields which are expanded in terms of the two-dimensional space harmonics and the primary fields. The coupled mode equations for the equitorial uniaxial chiral media give the general solutions of fields as the superposition of elliptically-polarized eigen modes. The unknown currents on the patches are determined by applying Moment method to the boundary condition of the conducting array. In the numerical computations, the polarization characteristics of diffracted waves are investigated considering the design parameters.