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Measurement of Coherent Backscattering Phenomena in Emulsion

Coherent backscattering measurement was applied for the study of microstructures in emulsified liquids. An enhanced component towards the backscattering direction emerges superimposed on the diffuse light scattering from a sample with randomly dispersed scatterers, giving evidence of the weak localization of light in random systems. Accurate measurement of the coherent backscattering peak gives us information on the optical transport mean free path in the sample, which leads to an estimation of the droplet size in emulsion. A new measurement system was developed and the clear backscattering peaks were successfully observed for various kinds of emulsions. The key technique of the present experiment was to decrease the laser speckle by stirring the liquid. The result obtained for heptane/AOT/water emulsion was qualitatively related to the droplet size which could be controlled by changing the amount of added salt. The effect of excluded volume on the scattering mean free path was discussed.