title: Self-trapping and flipping of double-charged vortices in optically induced photonic lattices.
abstract: We report what is believed to be the first observation of self-trapping and charge-flipping of double-charged optical vortices in two-dimensional photonic lattices. Both on- and off-site excitations lead to the formation of rotating quasi-vortex solitons, reversing the topological charges and the direction of rotation through a quadrupole-like transition state. Experimental results are corroborated with numerical simulations.
authors.affiliation: Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94132, USA.
authors.forename: Anna
authors.initials: A
authors.lastname: Bezryadina
authors.forename: Eugenia
authors.initials: E
authors.lastname: Eugenieva
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Chen