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Observation of Surface Gap Solitons in Semi-Infinite Waveguide Arrays
We report on the observation of surface gap solitons found to exist at the interface between uniform and periodic dielectric media with defocusing nonlinearity. We demonstrate strong self-trapping at the edge of a ${\mathrm{LiNbO}}_{3}$ waveguide array and the formation of staggered surface solitons with propagation constant inside the first photonic …