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Ansys Learning Forum › Forums › Discuss Simulation › Photonics › scattering calculation with gaussian beam in FDTD › Reply To: scattering calculation with gaussian beam in FDTD

August 5, 2024 at 4:49 pm
yuqizhu
Subscriber

re high NA gaussian beams, the side normal profile looks ok now after I moved the PML farther out like you suggested. However, the z- noraml cross sections still don't look as gaussian as i'd expect. Here is a screenshot (NA=0.9) in my google drive; I can't upload images today for some reason. 

For low NA beams, I have a different problem, (NA=0.11). Both z- and y-normal profiles look wavey. The lower PML in z is ~2.5 lambda way from the injection plane, and simulation span is X/Y is ~15 um. Is this also from some numerical artifacts?Â