Crossover from self-defocusing to discrete trapping in nonlinear waveguide arrays
classification
🌊 nlin.PS
physics.optics
keywords
discretenonlineararrayscrossoverself-defocusingwaveguidebeamcontrast
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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.
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