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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster II
Q 30.63: Poster
Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster
Observation of double-charge vortex solitons in hexagonal photonic lattices — •Dennis Göries1, Bernd Terhalle1, Patrick Rose1, Tobias Richter2, Tristram J. Alexander3, Anton S. Desyatnikov3, Wieslaw Krolikowski3, Friedemann Kaiser2, Yuri S. Kivshar3, and Cornelia Denz1 — 1Institut für Angewandte Physik, Westfälische Wilhelms-Universität Münster, Germany — 2Institut für Angewandte Physik, Technische Universität Darmstadt, Germany — 3Nonlinear Physics Center and Laser Physics Center, Research School of Physical Sciences and Engineering, Australian National University, Canberra, ACT 0200, Australia
Wave propagation in periodic nonlinear structures is associated with many exciting novel opportunities of controlling light for future applications in all-optical information processing. A well known example is the existence of discrete self-localized states, e. g. discrete solitons or more complex discrete vortex solitons carrying phase dislocations and transverse energy flows. In this work, we present the experimental observation of stable double-charge ringshaped vortex solitons generated in optically-induced photorefractive photonic lattices, and corroborate our results by numerical simulations using the full anisotropic photorefractive model. We demonstrate that the stability is determined by intersite power exchange, and show that for a focusing nonlinearity single-charge vortices are unstable whereas double-charge vortices are stable . The results are subsequently extended to the case of a defocusing nonlinearity and reveal that in this case the single charge vortex is stable whereas the double-charge vortex is unstable.