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Grating Calculator is a freeware application for the Calculation of Focal Planes of General Diffraction Gratings, from Rowland Type to the most modern aperiodic line density concave gratings used for soft x-ray diffraction.
This software analyzes periodic dielectric gratings using an efficient numerical scheme based on Floquet Bloch theory. The software finds the propagation modes of a multilayer dielectric waveguide structure with periodic corrugations.
MRCWA - Multilayer Rigorous Coupled Wave Analysis is a fast, flexible optical grating solver. It calculates an exact solution to the Maxwell equations for the diffraction of light from an optical grating with arbitrary profile and materials.