Abstract
We demonstrate that light propagation in waveguide arrays that include -symmetric structures can exhibit strongly nonlocal sensitivity to topology of the array at fixed other parameters. We consider an array composed of lossless waveguides, that includes a pair of -symmetric waveguides with balanced gain and loss, and reveal that -symmetry breaking thresholds are different for planar and circular array configurations. These results demonstrate that -symmetric structures can offer new regimes for optical beam shaping compared to conservative structures.
©2012 Optical Society of America
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