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Phys Rev Lett. 2011 Mar 4;106(9):093901. Epub 2011 Feb 28.

Observation of nonlinear self-trapping of broad beams in defocusing waveguide arrays.

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  • 1Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, Australia.


We demonstrate experimentally the localization of broad optical beams in periodic arrays of optical waveguides with defocusing nonlinearity. This observation in optics is linked to nonlinear self-trapping of Bose-Einstein-condensed atoms in stationary periodic potentials being associated with the generation of truncated nonlinear Bloch states, existing in the gaps of the linear transmission spectrum. We reveal that unlike gap solitons, these novel localized states can have an arbitrary width defined solely by the size of the input beam while independent of nonlinearity.

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