Aa. Lisyansky et D. Livdan, INFLUENCE OF INTERNAL-REFLECTION ON CORRELATION OF INTENSITY FLUCTUATION IN RANDOM-MEDIA, Physical review. B, Condensed matter, 47(21), 1993, pp. 14157-14164
The correlation function of electromagnetic-intensity fluctuations is
calculated in the diffusive regime in the presence of absorption using
the Langevin approach. The results show that reflection of the bounda
ry may cause drastic changes in the behavior of the correlation functi
on. In the case of low absorption the spatial-correlation function und
ergoes a crossover from a quadratic to a linear falloff with separatio
n as the reflection increases. The autocorrelation function for a medi
um with highly reflecting boundaries varies with frequency shift as (D
ELTAomega)-1 instead of (DELTAomega)-1/2 for boundaries with low refle
ction.