I have the refractive indices (n & k) of a thin film. I can estimate the real part of sub-wavelength structures by considering the shape and void fraction using a simple linear relation. However, I could not find any reference to analytically estimate/calculate the imaginary part of such sub-wavelength structures.

I could find the following but, unfortunately, this is not applicable to my question:

Kar, Meenakshi, Bhullan S. Verma, Amitabha Basu, and Raghunath Bhattacharyya. "Modeling of the refractive index and extinction coefficient of binary composite films." Applied optics 40, no. 34 (2001): 6301-6306.

Would you please introduce a reliable reference or some that are straight forward?

Thanks, in advance.

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