In the scientific literature, we can read many dispersion functions which are suitable for a certain type of thin film (Cauchy, Sellmeier, Lorentz, Drude...). My goal is how to describe the absorber films?
Hello. Interesting question. For which material ? Which wavelength ?
Well, from the sheer number of models you might get the idea that there is no quick answer for this. Also, strictly speaking, your question already mixes up things: Sellmeier is a n-parametrisation developed for glasses and other dielectrics, so no absorption here. Cauchy similar, often comes with an Urbach-addition for absorption. Drude is an oscillator model from Drude's metal electromagnetic theory. Lorentz is a general oscillator model which is useful for many systems....
Your options here are:
tell us which material you have and we could make wild guesses (not recommended).
read a textbook on spectroscopic ellipsometry, especially the chapter(s) on partly absorbing layers (recommended). I would recommend Fujiwara or Azzam/Bashara. Then think about what kind of material you have and try the according model or combination of models.
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