Spatial solitons and modulational instability in the presence of large   birefringence: the case of highly non-local liquid crystal
  With reference to spatially non-local nematic liquid crystals, we develop a theory of optical spatial solitons and modulational instability in anisotropic media with arbitrarily large birefringence. Asymmetric spatial profiles and multivalued features are predicted for self-localized light versus walk-off angle. The results hold valid for generic self-focusing birefringent media and apply to large angle steering of individual and multiple self-trapped optical beams. 
Claudio Conti, Marco Peccianti, Gaetano Assanto