TY - JOUR
T1 - Stable counter-rotating vortex pairs in saturable media
AU - Desyatnikov, Anton S.
AU - Mihalache, Dumitru
AU - Mazilu, Dumitru
AU - Malomed, Boris A.
AU - Lederer, Falk
N1 - Funding Information:
We appreciate valuable discussions with Yu.S. Kivshar. This work was partially supported by the Australian Research Council, the Australian National University, and by the Deutsche Forschungsgemeinschaft, Bonn.
PY - 2007/4/30
Y1 - 2007/4/30
N2 - We resolve a controversial issue of the stability of composite vortex solitons in self-focusing saturable nonlinear media. Stable vortex solitons with hidden angular momentum, i.e., composed of counter-rotating beams with topological charges +1 and -1, are found, and their linear-stability region is identified. In contrast, the solitons with explicit vorticity are always unstable against splitting. The predicted linear stability of the hidden-vorticity solitons is achieved in the strong-saturation regime, when the soliton's total power exceeds a certain threshold. The dynamical stability is verified in direct simulations of nonlinear model.
AB - We resolve a controversial issue of the stability of composite vortex solitons in self-focusing saturable nonlinear media. Stable vortex solitons with hidden angular momentum, i.e., composed of counter-rotating beams with topological charges +1 and -1, are found, and their linear-stability region is identified. In contrast, the solitons with explicit vorticity are always unstable against splitting. The predicted linear stability of the hidden-vorticity solitons is achieved in the strong-saturation regime, when the soliton's total power exceeds a certain threshold. The dynamical stability is verified in direct simulations of nonlinear model.
KW - Optical angular momentum
KW - Optical vortex
KW - Phase dislocation
KW - Spatial soliton
UR - http://www.scopus.com/inward/record.url?scp=33947156169&partnerID=8YFLogxK
U2 - 10.1016/j.physleta.2006.11.090
DO - 10.1016/j.physleta.2006.11.090
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AN - SCOPUS:33947156169
SN - 0375-9601
VL - 364
SP - 231
EP - 234
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
IS - 3-4
ER -