My structure is periodic along x.I wanna set boundary conditions.
I khow z boundary condition is PML.
I have read this page completly
but I have not learned how can set it.
please tell me how can I set it for any structure.
Thanks for any help.
If this is normal incidence, then you should use periodic boundary conditions.
There is a tutorial that looks similar to your application and I would encourage you to reproduce the results in the tutorial for normal incidence. If the published results you are reproducing indeed require angled injection, I am happy to continue the discussion here.
If you are learning our software, I would also recommend the introductory video (at the bottom of this page) to get used to software.
Thank you so much.