Observation of double-charge discrete vortex solitons in hexagonal photonic lattices

Bernd Terhalle, Tobias Richter, Kody J.H. Law, Dennis Göries, Patrick Rose, Tristram J. Alexander, Panayotis G. Kevrekidis, Anton S. Desyatnikov, Wieslaw Krolikowski, Friedemann Kaiser, Cornelia Denz, Yuri S. Kivshar

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Abstract

We report on the experimental observation of stable double-charge discrete vortex solitons generated in hexagonal photonic lattices created optically in self-focusing nonlinear media and show that single-charge vortex solitons are unstable in analogous conditions. Subsequently, we study, both theoretically and experimentally, the existence and stability of spatial vortex solitons in two-dimensional hexagonal photonic lattices. We demonstrate that the stability of the double-charge vortices is a consequence of the intersite power exchange in the vortex soliton, and we provide a simple stability criterion on the basis of the analysis of the corresponding discrete nonlinear model. We extend our analysis to the case of defocusing nonlinearity and show the inversion of the vortex stability properties resulting in the fact that single-charge vortices become stable while their double-charge counterparts are unstable.

Original languageEnglish
Article number043821
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume79
Issue number4
DOIs
Publication statusPublished - Apr 1 2009
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Terhalle, B., Richter, T., Law, K. J. H., Göries, D., Rose, P., Alexander, T. J., Kevrekidis, P. G., Desyatnikov, A. S., Krolikowski, W., Kaiser, F., Denz, C., & Kivshar, Y. S. (2009). Observation of double-charge discrete vortex solitons in hexagonal photonic lattices. Physical Review A - Atomic, Molecular, and Optical Physics, 79(4), [043821]. https://doi.org/10.1103/PhysRevA.79.043821