Two-dimensional Optical Superlattice Research Articles

Experimental observations of bistability and instability in a two-dimensional nonlinear optical superlattice.

Optical bistability in a two-dimensional nonlinear superlattice, resulting from the index-modulation mechanism, was observed in experiment for the first time. The two-dimensional nonlinear superlattice was constructed by recording a two-dimensional refractive index grating into a photorefractive material, a Fe-doped LiNbO 3 single crystal. Optical instability was also observed in this experiment

Light transmission in two-dimensional optical superlattices.

The propagation and interaction of light in the two-dimensional optical superlattice, a two-dimensional periodically modulated medium, were investigated by the dynamical theory with the four-wave approximation, which is based on an incident beam that satisfies Bragg conditions in two orthogonal directions. The excited fields and the intensities of exiting waves in the two-dimensional optical superlattice were calculated. The relation between relative intensities of the exiting waves and angular deviation of the incident beam as well as the index-modulated parameters of the superlattice was obtained. Also discussed are possible applications of the superlattices in optical communications.