EFFICIENT MODELING OF ELECTROMAGNETIC SCATTERING BY SYMMETRIC LAMELLAR PERIODIC STRUCTURES AT NORMAL INCIDENCE

An efficient modeling of the electromagnetic scattering properties of symmetric lamellar periodic structures at normal incidence is discussed within the framework of the modal-field approach. By taking advantage of the inherent symmetry, a numerical computational speedup of up to 8 times can be achieved by explicitly ignoring anti-symmetric modes, which play no role in the scattering process at all.