Demonstration of all-optical beam steering in modulated photonic   lattices
  We demonstrate experimentally all-optical beam steering in modulated photonic lattices induced optically by three beam interference in a biased photorefractive crystal. We identify and characterize the key physical parameters governing the beam steering, and show that the spatial resolution can be enhanced by the additional effect of nonlinear beam self-localization. 
Christian R. Rosberg, Ivan L. Garanovich, Andrey A. Sukhorukov,   Dragomir N. Neshev, Wieslaw Krolikowski, Yuri S. Kivshar