Angular surface solitons in sectorial hexagonal arrays
  We report on the experimental observation of corner surface solitons localized at the edges joining planar interfaces of hexagonal waveguide array with uniform nonlinear medium. The face angle between these interfaces has a strong impact on the threshold of soliton excitation as well as on the light energy drift and diffraction spreading. 
A. Szameit, Y. V. Kartashov, V. A. Vysloukh, M. Heinrich, F. Dreisow,   T. Pertsch, S. Nolte, A. Tunnermann, F. Lederer, L. ...