Novel spatial gap solitons in photonic lattices

We briefly review our recent work on a series of spatial gap solitons in two-dimensional optically induced photonic lattices, including fundamental gap solitons, dipole-like gap solitons, gap soliton trains, and gap vortex solitons. In some cases, spectrum reshaping and bifurcation of spatial solitons from the bottom of the 1st transmission band with anomalous diffraction to the forbidden gap is experimentally observed. The π-staggered phase structures of the gap solitons are confirmed with the interferograms. Our experimental results are in good agreement with the theoretical predications.