Stability of vortex solitons in a photorefractive optical lattice

Details Stability of vortex solitons in a photorefractive optical lattice Stability of vortex solitons in a photorefractive optical lattice

2003-10-16

arxiv.org/abs/nlin/0310024v1

Nonlinear Sciences

Pattern Formation and Solitons

3 pages, 5 figures

Scientific paper

10.1088/1367-2630/6/1/047

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.

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