OmniSim can be used to model diffractive optics thanks to its various Maxwell solvers: FETD, FDTD, RCWA and FEFD. RCWA and FETD can be used to model infinitely periodic gratings in 2D and 3D with oblique incidence, and the combination of FDTD and FETD is ideal for modelling aperiodic structures.

Examples:

• Gratings with RCWA
• Diffraction Grating