Modified generalized total-field/scattered-field FDTD boundary in PML region

This paper proposes a modified generalized total-field/scattered-field (G-TF/SF) boundary for finite-difference time-domain (FDTD) to model an infinite material scatterer within a compact FDTD grid when 0 ≤ θ_inc ≤ 90° (θ_inc is the wave propagation angle). This requires the sourcing of numerical plane wave traveling into the perfectly matched layer (PML) absorber bounding the grid. In this method, the modified G-TF/SF boundary can simplify the disposal of G-TF/SF boundary formulation. This technique is applied to model the electromagnetic wave propagation in free space and model 2-D TM diffraction of an infinite right-angle dielectric wedge. And there is a good correspondence between the results obtained by various methods.