Localisation of light in disordered lattices

A short review of the basic concepts underlying localisation of light through multiple scattering in disordered media is provided, in conjunction with the ideas related to the universal features occurring during transport of waves and Anderson localisation. Progress in the area is described, including the recent experimental observation of localisation in photonic lattices upon which random perturbations are superimposed, which has constituted the first observation of Anderson localisation in any perturbed periodic system. Subsequently, some of the new intriguing concepts in the field of localisation of light are discussed, among them the combination of nonlinearity and disorder, and their effects on waves transport. Finally, being somewhat speculative, future directions in the area and their potential impact on the basic understanding of the universal phenomena associated with transport of waves are suggested.