Crossover from self-defocusing to discrete trapping in nonlinear waveguide arrays

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/225326We 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.6 pages, 4 figuresPattern Formation and SolitonsOpticsCrossover from self-defocusing to discrete trapping in nonlinear waveguide arraystext