Control of Light Diffusion in a Disordered Photonic Waveguide
  We control the diffusion of light in a disordered photonic waveguide by modulating the waveguide geometry. In a single waveguide of varying cross-section, the diffusion coefficient changes spatially in two dimensions due to localization effects. The intensity distribution inside the waveguide agrees to the prediction of the self-consistent theory of localization. Our work shows that wave diffusion can be efficiently manipulated without modifying the structural disorder. 
Raktim Sarma, Timofey Golubev, Alexey Yamilov and Hui Cao
physics.optics