PlanOpSim software uses multiscale simulation. In the Metacell module we use RCWA, in the MetaComponent model approximated methods and propagation optics are used to rapidly model large-area metasurfaces
There are a few advantages our software holds for utilizing RCWA instead of other full wave solvers such as FDTD or FEM out of which the most important is speed. The detailed analysis considering a particular design problem has been discussed in the following Article.