Learning Forum

[r13941072]

We can obtain the refractive index (n) and extinction coefficient (k) values, and generate a fitted curve using FDTD simulation, as shown in Figure 1. However, the exact fitting formula used by the software is not explicitly provided. Could you please provide the specific fitting model or equation used for extracting n and k?

For reference, we are using the Sellmeier equation model, which fits n² versus λ², as demonstrated in the figure below.

            

[Dimitris Polyzos]

Hello, 

Unfortunately we cannot provide the fitting material formula as this is something known to the R&D team. I can assume that it is a polynomial fitting function that after playing with the tolerances ( "Show advanced"  tab) you can obtain a good fit with Sellmeier's fitting depicted in the second figure.

For more information please refer to : Creating-new-sampled-data-materials-in-FDTD

Regards

Dimitris