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I am trying to calculate the dielectric function of a thin silicon film from the real and imaginary values of the refractive index, which I have for wavelengths between 300 and 900 nm. If I have the n and k values (real and imaginary components of the refractive index), could anyone advise me as to how excactly to calculate the dielectric function from these values?

Am I correct in thinking the formulae shown under the 'Relation to dielectric constant' section in the following link are the right formulae to use?

http://en.wikipedia.org/wiki/Refractive_index

Any advice would be greatly appreciated.

Thanks.