{"id":374336,"date":"2024-07-31T04:06:18","date_gmt":"2024-07-31T04:06:18","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374336\/"},"modified":"2024-07-31T15:50:31","modified_gmt":"2024-07-31T15:50:31","slug":"374336","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/374336\/","title":{"rendered":"Reply To: scattering calculation with gaussian beam in FDTD"},"content":{"rendered":"

<p> <\/p><p> <\/p><p>ok, thanks. In my current simulation, the sphere is a lot bigger than the gaussian waist. <s>Related to strongly focus beams, attached is a Re(E) map of the beam w\/o the scatter (NA=1, using thin lens, linear polarization, proprogate along +z) near the waist and where the scatter would be. why doesn’t this beam profile look gaussian? My source span and simulation span are set to ~50 um. <\/s><\/p><p> <s>\"NA=1\"<\/s><\/p><p>Re calculating scattering cross section from E and H fields, are there examples or internal functions for such calculation? I assume I also need to normalize power and intensity in this process? Also as I understand it, the cross section obj uses transmissions and the soure’s cross section to calculate sigma. So can i just do a differential transmission calculation?<\/p><\/p>\n","protected":false},"template":"","class_list":["post-374336","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t