A ray-based method for wave propagation, referred to as "stable aggregates of flexible elements," is used to model diffraction. This method assigns Gaussian contributions to each ray, such that their sum is insensitive to the Gaussians' width. Diffraction is modeled by including contributions from rays scattered by the obstacles' edges.
© 2004 Optical Society of America
M. A. Alonso and G. W. Forbes, "Ray-based diffraction calculations using SAFE," in Frontiers in Optics 2004/Laser Science XXII/Diffractive Optics and Micro-Optics/Optical Fabrication and Testing, OSA Technical Digest Series (Optical Society of America, 2004), paper FTuG22.
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