calculating the effective index using FDTD

Hi all Dears
please tell me how we can calculate the effective index using FDTD?
any help can be a great hint
best regards

I assume you mean index of refraction. Use a vacuum-material X planar interface.
Insert a planewave use the reflected and transmitted waves to compute the index
of refraction. (Some more details on what you want to do may be helpful.)

I assume you mean index of refraction. Use a vacuum-material X planar interface.
Insert a planewave use the reflected and transmitted waves to compute the index
of refraction. (Some more details on what you want to do may be helpful.)