Anomalous diffusion of light in TiO2-powder layers near the absorption edge

The transfer of visible and near-IR radiation in layers of polydisperse TiO₂ (rutile) particles has been studied by measuring diffusion transmission and coherent backscattering in order to determine the optical parameters of the samples under investigation. An approach based on the coherent potential approximation is applied. It has been shown that, in the short-wavelength region of the visible range, anomalous diffusion of light occurs due to the effect of interference at mesoscopic scales on the transport characteristics of the scattering medium.