How do I adjust the default material fit shown in FDTD Solutions Material Explorer?
If the automatically generated fit is not good enough you can adjust many fit parameters as shown in this link:
Click Check, Material Explorer and a window will pop up. Select the material you want to check. Click “Fit and Plot”. To see all the fitting parameter, click Show Advanced.
From my experience, the fitting procedure can be an art. It is better to illustrate your problem with an example, so that the community could help you with more tailored solutions. As a rule of thumb, the fit works better in a narrow spectral window than in a very broad one. Divide you calculation in two or three spectral regions. Get a fit to the material for each region. Run the simulations and glue the results.