jackzhf
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For a constant complex refractive index for a material in your question, did you refer to a non-dispersive material?

 

You can “define a material based on a single complex refractive index value (e.g., n + ik = 2 + 0.05i) for single frequency simulation.”

https://optics.ansys.com/hc/en-us/articles/360034394654-Tips-for-using-the-n-k-material-model-in-FDTD