Thanks for your kind reply.
First, I set a result from PVlighthouse's calculator (OPAL2) as a reference. And the trend is similar between the reference and my FDTD results.
So I can be confident with my FDTD results.
The problem is the RCWA results. It's quite different from the reference and FDTD results.
I found the index results and material fitting are okay.
Why do the current RCWA results differ from FDTD?
Also, I checked the link so that you can download my files.
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