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Photorefractive light needles in glassy nanodisordered KNTN

D. Pierangeli, J. Parravicini, F. Di Mei, G. B. Parravicini, A. J. Agranat, and E. DelRe

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Abstract

We study the formation of 2D self-trapped beams in nanodisordered potassium-sodium-tantalate-niobate (KNTN) cooled below the dynamic glass transition. Supercooling is shown to accelerate the photorefractive response and enhance steady-state anisotropy. Effects in the excited state are attributed to the anomalous slim-loop polarization curve typical of relaxors dominated by non-interacting polar-nano-regions.

© 2014 Optical Society of America

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