Polarization-current-based, finite-difference time-domain, near-to-far-field transformation

摘要

A near-to-far-field transformation algorithm for three-dimensional finite-difference time-domain is pre-nsented in this Letter. This approach is based directly on the polarization current of the scatterer, not thenscattered near fields. It therefore eliminates the numerical errors originating from the spatial offset of the Enand H fields, inherent in the standard near-to-far-field transformation. The proposed method is validated viandirect comparisons with the analytical Lorentz–Mie solutions of plane waves scattered by large dielectricnand metallic spheres with strong forward-scattering lobes. © 2009 Optical Society of American.