I would like to calculate the n and k of an approximately 1410 nm thick layer (GaN) deposited on a sapphire substrate by MOVPE at 1050 C,
I have the reflectance spectrum of R = f(lambda) and the Fabry-Perot interference spectrum during deposition. Wavelengths from 400 to 620 nm were analysed.
In the paper "Quantitative simulation of in situ reflectance data from metal organic vapour phase epitaxy of GaN on sapphire" for a wavelength of 450 nm, n = 2.606 and k = 0.04.
The value presented is consistent with the value used in the calculations.
How to calculate n and k from the spectrum for e.g. wavelengths 450, 460, 470 etc. ? Is there a free program to calculate n and k or is there a function to calculate in a program such as OriginLab?
I would be very grateful for your help.
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