Guilin Sun
Ansys Employee

 

Collimated source in lab usually means plane wave in FDTD. But for coupling, collimated source might not be efficient. Focused gaussian beam can be better. Please try. It is the excitation source that is required in FDTD.

If you are new, please visit some online videos:  https://optics.ansys.com/hc/en-us/sections/360007813194-FDTD100-List-of-videos