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Engineering wavefront caustics trajectories in PT -symmetric lattices

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Abstract

We utilize caustic theory in PT-symmetric lattices to design focusing and curved beam dynamics. We show that the gain and loss parameter in these systems provides an additional degree of freedom that allows for the design of the same caustics trajectories with different intensity distribution in the individual waveguides. Moreover we can create aberration-free focal points at any paraxial distance zf, with anomalously large focal intensity.

© 2015 Optical Society of America

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