Reply To: Reflection is more than 1 with BFAST source for off-normal incident

[Guilin Sun]

You can use grating analysis: https://optics.ansys.com/hc/en-us/articles/360042088813-Diffraction-grating

10ps might still not be long enough: it may also need to use smaller autoshutoff min. those are the two main causes:

PML reflection

simulaiton not long enough by simulation time and(or) autoshutoff min.