Coherent backscattering of light from a polydisperse random medium as a model of fractal aggregations of particles

Toshiaki Iwai; Katsuhiro Ishii; Toshimitsu Asakura

doi:10.1117/12.311880

19 June 1998 Coherent backscattering of light from a polydisperse random medium as a model of fractal aggregations of particles

Toshiaki Iwai, Katsuhiro Ishii, Toshimitsu Asakura

Author Affiliations +

Proceedings Volume 3252, Optical Diagnostics of Biological Fluids III; (1998) https://doi.org/10.1117/12.311880
Event: BiOS '98 International Biomedical Optics Symposium, 1998, San Jose, CA, United States

Abstract

The reproducible models of biomedical optics, the measurements of chemical compounds, the aggregations of particles and so on require the statistical space-time properties of the multiply scattered light in laboratories to be analyzed quantitatively. A cluster-cluster structure in fractal media is replaced with a polydisperse random medium by renormalizing a cluster to a particle. As the particle size-distributions, a simple summation of particles with two radii, a Gaussian function and a power law function were used in numerical simulations. The light scattered from particles inside a cluster affects a decreasing rate of the backscattering intensity cone but not a relaxation time of autocorrelation functions of the time- varying intensity. On the contrary, the movement of the cluster affects strongly the relaxation time through the diffusion constant but not a decreasing rate of the backscattering intensity enhancement. As a result, it is concluded that the temporal autocorrelation functions of the time-varying light intensity scattered multiply from the cluster-cluster structure are applicable to measure the averaged cluster size of aggregations.

Citation Download Citation

Toshiaki Iwai, Katsuhiro Ishii, and Toshimitsu Asakura "Coherent backscattering of light from a polydisperse random medium as a model of fractal aggregations of particles", Proc. SPIE 3252, Optical Diagnostics of Biological Fluids III, (19 June 1998); https://doi.org/10.1117/12.311880

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