Patent ID: 8701998

Claim:
An optical device comprising: a slab, said slab comprising a material; and a plurality of elements arranged in a lattice surrounding a photonic crystal waveguide, said lattice elements being formed in said slab by removing the material, with each said lattice element having a center located at a position (x,y), wherein first and second lattice elements differ in shape or orientation depending on their position (x,y) in the lattice, and said lattice is disordered due to randomized orientation of said lattice elements or geometrical perturbations introduced into said lattice elements, and wherein said lattice elements cause a localized guided light field of the waveguide; wherein said difference in the shape of said first and said second lattice elements is defined by a disorder function of permittivity Δ£(x,y) so that Δ£(x,y)=£ real (x,y)−£ ideal (x,y), where £ ideal (x,y) represents the permittivity of an ideal lattice with perfect translational symmetry, (x,y) correspond to any position (point) in the lattice, £ real (X,y) corresponds to the permittivity values at points (x,y).