Defect solitons supported by two-dimensional lattice potentials in biased centrosymmetric photorefractive crystals with saturable self-focusing nonlinearity

Abstract

We investigate the defect solitons (DSs) in square photonic lattices in biased centrosymmetric photorefractive crystals with saturable self-fousing nonlinearity. We reveal the existence and stable regions of DSs due to the changing defect strength; in particular, DSs appear to be unstable in the first bandgap with high power where the repulsive defect is, which is usually stable in non-centrosymmetric media. The DSs existence and stable regions reduce with the increase of the attractive defect strength in the semi-infinite bandgap. For a repulsive defect, DSs can be profoundly affected by their defect potentials and power.

Optical fabrication of (2 + 1)-dimensional photorefractive photonic lattices by improved Billet split lens

“…The optical induced method utilizes multi-beam interference and photorefractive materials to prepare photonic lattices, which is a very promising method. At present, many quantized optical phenomena (such as optical Bloch oscillations, dynamic localization, tunneling control) have been discovered in optically induced photorefractive photonic lattices, and many meaningful achievements have been made [17][18][19][20][21][22][23]. However, in these related experimental studies, the optical devices used to produce photonic lattices are complex and difficult to adjust, or rely on expensive equipment.…”

The evolution of the out-of-phase dipole beams in the repulsive defect photonic moiré lattice with saturable self-focusing nonlinearity media

“…Defects have a profound effect on beams in periodic potentials. Light propagation in periodic photonic lattices with a defect is under intensive study [7,[29][30][31][32][33]. Therefore, we introduce defects into the photonic moiré lattices, and some properties were discovered.…”