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Space-time statistics of coherently backscattered light from fractal and nonfractal random media with absorption

A study on the multiply-backscattered light with low scattering orders form a strongly absorbent medium where the light can hardly propagate is of benefit to the metrology in biophysics, chemistry, and others. This report is concerned with the investigations on a spatial intensity distribution and a temporal autocorrelation function of the time-varying light backscattered coherently from aggregated particles in uniformly random and fractal media. The investigations were conducted by means of Monte Carlo simulation based on the Rayleigh-Debye scattering theory. In the spatial intensity distribution, the peak intensity of an enhancement cone decreases for the co-polarized intensity but increases for the cross-polarized intensity with an increase of the absorption while its width for both cases spreads. A fractal dimension of the medium affects a decreasing rate of the intensity cone, independently of the absorption. In the temporal correlation, the absorption influences a decay of the autocorrelation function in the short delayed time in such a way that the relaxation time increases consistently with the absorption. A decreasing feature of the autocorrelation function the long delayed time depend on the fractal dimension rather than the absorption but its effect is not so remarkable. In the report, we reveal the spatial and temporal features of coherently-backscattered intensity variations with relation to the occurrence rates of the pathlength and the scattering order in the light propagating from the incidence to the exit.