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We adopt a statistical mechanical approach toward the optics of textured and inhomogeneous optical sheets. As a general rule, the local light intensity in such a medium will tend to be 2 n^2 (x) times greater than the externally incident light intensity, where n (x) is the local index of refraction in the sheet. This enhancement can contribute toward a 4 n^2 (x) increase in the effective absorption of indirect-gap semiconductors like crystalline silicon.
Yablonovitch et al. (Mon,) studied this question.