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Implementation of Gaussian beam sources k (Direction defined by phase progression on the TF/SF interface for plane wave ) Beam width w PML PML PML Incident field amplitude on TF/SF interface SF TF/SF interface All six faces of computational domain are terminated by PMLs TF scatterer PML PML Based on the TF/SF formulation for plane wave Einc = Einco * exp( -2/w2 ) Einco = plane wave amplitude, w = beam width, = distance from the beam axis Computation of incident fields is difficult when the scatterer is comprised of frequency dependent materials. Scattered Field Formulation Incident fields are needed over the entire volume of the scatterer. The scatterers must be totally enclosed by the TF/SF interface.