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Phys Rev Lett. 2009 Oct 2;103(14):143903. Epub 2009 Oct 1.

Quasi-BLOCH oscillations in curved coupled optical waveguides.

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  • 1Department of Electrical and Computer Engineering and Institute for Optical Science, University of Toronto, 10 King's College Road, Toronto, Ontario, M5S 3G4, Canada. arash.joushaghani@utoronto.ca


We report the observation of quasi-Bloch oscillations, a recently proposed, new type of dynamic localization in the spatial evolution of light in a curved coupled optical waveguide array. By spatially resolving the optical intensity at various propagation distances, we show the delocalization and final relocalization of the beam in the waveguide array. Through comparisons with other structures, we show that this dynamic localization is robust beyond the nearest-neighbor tight-binding approximation and exhibits a wavelength dependence different from conventional dynamic localization.

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