Research of Fundamental Factors for Weak Localization of Light

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The research for a localization of light in a random medium has been carried out actively on the analogy of the study of Anderson localization for an electron system in a random potential. As a result, a backscattering peak has been found to correspond to a weak localization of light. The localization of light has not yet been observed up to the present. A diffusion equation is generally used to treat the problem of localization of light. The equation may explain many experimental results concerning with weak localization phenomena, but does not give a direct image like the Maxwell's equations. The diffusion equation includes many approximations and has not been able to clarify the reason for a light not to localize and it is required further experimental analyses. The purpose of this investigation is to obtain information experimentally for the basic parameters related with a weak localization. In this experiment, a coherent backscattering peak was studied for the scattering medium including two different scatterers of polystyrene beads with a size ranging from 0.3 to 1.1μm using a He-Ne laser as a light souse. In the regime dominated by geometrical scattering, it was found that coherent backscattering profile was not affected by the mixture of different scatterers. The effective path length through the scattering medium was estimated by dissolving a light absorbing dye into the scattering medium with different scattering densities. From these measurement, it was found that both a effective path length and a mean free path were decreased as a scattering density was increased. The effective number of scattering were derived by using these quantities. The number showed slight decrease as the scattering density was increased and the results were discussed.
東海大学の論文

Research of Fundamental Factors for Weak Localization of Light

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