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Ansys Learning Forum › Forums › Discuss Simulation › Photonics › Cinvergence of RCWA simulations › Reply To: Cinvergence of RCWA simulations

May 3, 2024 at 9:33 pm
Guilin Sun
Ansys Employee

This is an interesting topic. I tend to believe that the shift is due to the RCWA converging accuracy. It fluctuates around the theoretical result. For FDTD, it has numerical dispersion error (and other numerical errors such as PML and source injection etc). So it is hard to say where the theoretical location is before you do converging test.

For RCWA converging testing, it might not be monotonic when you only change one parameter to certain point.Â