Thank you Ardavan! I will try this and ineffective pml might be why I still have an inaccurate result when the incident angle is large. But I was also wondering when I have the source covering the whole frequency range, including those don't have well defined mapped incident angle (evanescent waves), whether you think the ineffective pml was also the cause for the inaccurate result on two ends of the frequency range. On the large frequency end, the incident angle is not very grazing (143 degree) but there is still huge difference and not converging.
On Sun, Dec 6, 2020 at 11:52 AM Ardavan Oskooi <ardavan.osk...@gmail.com> wrote: > Note that PMLs become less effective for incident waves at large oblique > angles. This effect is described in: > > https://meep.readthedocs.io/en/latest/FAQ/#why-are-the-fields-not-being-absorbed-by-the-pml. > > Rather than increase the PML thickness as you seem to be doing, a better > solution is to replace the PML with an Absorber. > > On 12/6/20 08:16, Mandy Xia wrote: > > incident angles, especially at the two ends of the frequency range > > (i.e. the largest frequency and the smallest frequency that has a well > > defined mapped incident angle). I tried to increase the resolution and > > pml thickness but they didn't help. I tried to construct the source > > with only frequencies that have well-defined mapped incident angles > > and the matching to the ground truth significantly improved (although > > at the small frequency end there is still a relatively large > > difference and I ran out of memory when increasing the resolution and > > couldn't make a conclusion if it was converging or not). I'm trying to > > figure out why this is the case and what is the impact on the > > simulation from the evanescent waves. I have a periodic boundary in > > the z direction and pml layers in the x and y directions. My source is >
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