Evolution of bright to dark photonic lattices in nonlinear medium type Kerr

In this work we present the formation of dark photonic lattices in negative nonlinear medium. Bright periodic lattices are generated by interference technique and propagated through 1 cm of length of nonlinear medium (R6G with acetone). The dependence with the laser (Ar) power and the geometry selected are showed. Three very interesting cases were obtained: two dimensional dark photonic lattices (2D), one dimensional dark photonic lattices, and (1D), and 2D and 1D combination effects. Our experimental results are accord with numerical simulations.