Time-domain two-dimensional scattering by moderately rough dielectric interfaces via narrow-waisted Gaussian beams

This paper treats the interaction of short-pulse electromagnetic radiation with one-dimensional (1D) moderately rough dielectric interfaces, which arise in many realistic problems, such as buried object imaging. Our ultimate goal is to incorporate physics-based, computationally efficient, forward models in such inverse scattering scenarios, in order to improve the overall computational performance. In this connection, we recently analyzed time-harmonic forward and inverse scattering from moderately rough surfaces, using a Gabor-based Gaussian beam algorithm (see Galdi, V. et al., IEEE Trans. Antennas Propagat., 2001). Here, we extend this forward scattering algorithm to pulsed excitation via a physical optics (PO) based approach in conjunction with pulsed beam discretization.