Application of FDTD for Accurate Scattering From Stratified Media With/Without Target

Abstract

Interactions of electromagnetic waves with stratified media, with or without a target, are fundamental in many fields. However, existing finite-difference time-domain (FDTD) method faces significant challenges in accurately modeling total internal reflection (TIR), frustrated total internal reflection (FTIR), and the composite structures of stratified media and targets. To address this issue, this paper employs the generalized total-field/scattered-field (G-TF/SF) method to address 3D electromagnetic scattering from stratified media, both with and without a target. Numerical simulations validate the effectiveness of the G-TF/SF method. Key findings demonstrate that the G-TF/SF method effectively mitigates edge effects in numerical simulations, accurately handles TIR and FTIR phenomena, and is well-suited for applications involving composite scattering from targets within stratified media.