title: Crossover from self-defocusing to discrete trapping in nonlinear waveguide arrays.
abstract: We predict a sharp crossover from nonlinear self-defocusing to discrete self-trapping of a narrow Gaussian beam with the increase of the refractive index contrast in a periodic photonic lattice. We demonstrate experimentally nonlinear discrete localization of light with defocusing nonlinearity by single site excitation in LiNbO(3) waveguide arrays.
authors.forename: Michal
authors.initials: M
authors.lastname: Matuszewski
authors.forename: Christian R
authors.initials: CR
authors.lastname: Rosberg
authors.forename: Dragomir N
authors.initials: DN
authors.lastname: Neshev
authors.forename: Andrey A
authors.initials: AA
authors.lastname: Sukhorukov
authors.forename: Arnan
authors.initials: A
authors.lastname: Mitchell
authors.forename: Marek
authors.initials: M
authors.lastname: Trippenbach
authors.forename: Michael W
authors.initials: MW
authors.lastname: Austin
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Krolikowski
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar