Singular self-trapped periodic lattices in anisotropic photorefractive media

This work generalizes the concept of two-dimensional nonlinear lattices with spatially modulated phase structure, or singular lattices, in anisotropic nonlocal self-focusing media. This study introduces novel stationary solutions, such as triangular patterns with the edge-type dislocations, and the square and hexagonal lattices with vortex phase dislocations. Experimetally, new types of self-trapped waves in a photorefractive SBN-crystal are generated and their guiding properties are investigated. Results demonstrated that these waves can be robust and observable for different lattice periods.