In this chapter we make an attempt to give a comprehensive overview on the optical modeling of layer structures that accommodate or are entirely composed of semiconductor nanocrystals. This research field is huge both in terms of the theories of effective dielectric functions and applications. The dielectric function of singlecrystalline semiconductors can be determined on high quality reference materials. The accuracy of the reference data depends mostly on the numerical or experimental elimination of the surface effects like oxides, nanoroughness, contamination, etc.
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