how to solve for 3D silicon waveguide loss in mode solution


i’m trying to find waveguide loss, mode loss is easy to find but how to find waveguide loss of some periodic structure.


It may be possible to calculate by exciting the waveguide mode and looking at the slope of the decay of the resonant fields of the mode as discussed on the following example under the “Dispersion and loss” heading.

If you are not already familiar with the bandstructure simulation methodology I would recommend first viewing this video which introduces the simulation methodolgy that is used in the above example:

Although FDTD Solutions is used in these examples, I think it should be possible to perform similar analysis using varFDTD.