Refractive Index Fitting

The refractive index of the material(substrate, coating material) is the most important data for the thin film calculation(Development, inversion fitting).

• Fitting the refractive index of the material by the photometric method need one or more of the transmittance, the reflectance and the film thickness. When the accuracy of the test data is the same, the fitting result is more reliable with more data type.
• We can fit the refractive index of a substrate or a kind of coating material. In general, we need know the refractive index of the substrate(can be fitted in advance) before we can fit the refractive index of coating material.
• Multi-angle photometric data may be helpful for the convergence of the refractive index fitting procedure.