Reply To: scattering calculation with gaussian beam in FDTD

[yuqizhu]

 

 

ok, thanks. In my current simulation, the sphere is a lot bigger than the gaussian waist. 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. 

 

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?