Crossover from renormalized to conventional diffusion near the three-dimensional Anderson localization transition for light

We report on anomalous light transport in the strong scattering regime. Using low-coherence interferometry, we measure reflection matrix of titanium dioxide powders, revealing crucial features optical which can not be observed with transmission measurements: (i) a subdiffusive regime at early times flight that is direct consequence predominant recurrent loops, and (ii) crossover to conventional, but extremely slow, diffusive long times. These observations support previous predictions near-field coupling between scatterers prohibits Anderson localization three-dimensional disordered media.