Broadband spectral analysis of chiral nanophotonic structures at circularly polarized incidence using DGTD solver

A transient circularly polarized excitation and its implementation in a generalized dispersive material model based discontinuous Galerkin time-domain solver are proposed for spectral analysis of chiral nanophotonic structures. The expression of a circularly polarized pulse with a certain bandwidth, which is real-valued and enables multi-physics and nonlinearity, is derived comprehensively. Numerical examples of nanophotonic structures are given in this paper. Such as reflection from metallic mirrors, transmission from S-shaped dielectric metasurfaces, and the spin response of C4 symmetrically arranged right-handed enantiomers. These examples demonstrate the accuracy and capability of the proposed method.