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Focusing-to-defocusing crossover in nonlinear periodic structures

Bennet, Francis H; Amuli, Ines; Sukhorukov, Andrey; Neshev, Dragomir; Krolikowski, Wieslaw; Kivshar, Yuri


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.

CollectionsANU Research Publications
Date published: 2010-10-01
Type: Journal article
Source: Optics letters
DOI: 10.1364/OL.35.003213


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