(Upper left) Light typically scatters strongly from a layer of zinc oxide particles and thus most of the light does not reach the detector. (Upper right) Light that is shaped and phase shifted in an optimum way can pass through the scattering layer so that a large fraction arrives at the detector. The lower left panels show the transmitted intensity distribution of horizontally polarized light in a 15 μm×15 μm square area at the back of the disordered sample. (a) For a nonoptimized incident wavefront. (b) For an optimized wavefront. (Lower right) Intensity summed in the y-direction to average over speckle. Dashed curve (blue), transmission of nonoptimized wavefront; Solid curve (red), transmission of optimized wavefront.