Subwavelength optical spatial solitons and three-dimensional   localization in disordered ferroelectrics: towards metamaterials of nonlinear   origin
  We predict the existence of a novel class of multidimensional light localizations in out-of-equilibrium ferroelectric crystals. In two dimensions, the non-diffracting beams form at arbitrary low power level and propagate even when their width is well below the optical wavelength. In three dimensions, a novel form of subwavelength light bullets is found. The effects emerge when compositionally disordered crystals are brought to their metastable glassy state, and can have a profound impact on super-resolved imaging and ultra-dense optical storage, while resembling many features of the so-called metamaterials, as the suppression of evanescent waves. 
Claudio Conti, Aharon J. Agranat, Eugenio DelRe
physics.optics cond-mat.dis-nn