Focusing-to-defocusing crossover in nonlinear periodic structures

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    We demonstrate experimentally a transition from nonlinear beam trapping to defocusing in a two-dimensional periodic photonic structures by varying the modulation depth of the lattice. The observed effect illustrates the fundamental crossover from discrete to cw transport mechanisms. At the threshold modulation, the output beam is highly sensitive to refractive index and power variations, which can be potentially applied for high-sensitivity refractive index or temperature sensing.

    Original languageEnglish
    Pages (from-to)3213-3215
    Number of pages3
    JournalOptics Letters
    Issue number19
    Publication statusPublished - 1 Oct 2010


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