Jovic, DraganaJovanovic, RBelic, MilivojKivshar, Yuri2010-07-142010-12-202010-07-142010-12-20Optics Express 17.24 2009: 21515-215211094-4087http://hdl.handle.net/10440/1035http://digitalcollections.anu.edu.au/handle/10440/1035We study interaction of counterpropagating beams in truncated two-dimensional photonic lattices induced optically in photorefractive crystals, and demonstrate the existence of counterpropagating surface solitons localized in the lattice corners and at the edges. We display intriguing dynamical properties of such composite optical beams and reveal that the lattice surface provides a strong stabilization effect on the beam propagation. We also observe dynamical instabilities for stronger coupling and longer propagation distances in the form of beam splitting. No such instabilities exist in the single beam surface propagation.7 pages"OSA will grant the authors permission to deposit the publisher’s pdf from their Optics Express articles into the repository with the proper citation (reference number or journal /volume/page/year citation)." - from email received from Authorized Agent, The Optical Society, 27/05/10Photorefractive nonlinear optics; (190.5530) Pulse propagation and solitons.2009-11-1010.1364/OE.17.0215152015-12-09