Stability of vortex solitons in a photorefractive optical lattice

Abstract

Stability of off-site vortex solitons in a photorefractive optical lattice is analyzed. It is shown that such solitons are linearly unstable in both the high and low intensity limits. In the high-intensity limit, the vortex looks like a familiar ring vortex, and it suffers oscillatory instabilities. In the low-intensity limit, the vortex suffers both oscillatory and Vakhitov-Kolokolov instabilities. However, in the moderate-intensity regime, the vortex becomes stable if the lattice intensity or the applied voltage is above a certain threshold value. Stability regions of vortices are also determined at typical experimental parameters.

3 pages, 5 figures

References in corpus (3)

• Observation of discrete vortex solitons in optically-induced photonic lattices
• Fundamental and vortex solitons in a two-dimensional optical lattice
• Discrete solitons and soliton-induced dislocations in partially-coherent photonic lattices

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