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Advanced Materials

Photorefractive Performance Enhancement in Polymer Dispersions of Nanosized Crystalline Domains

Authors

  • R. Termine,

    1. Laboratory for the Synthesis, Characterization, and Applications of Molecular Materials (LASCAMM)—Unità INSTM della Calabria, Dipartimento di Chimica, Università della Calabria, I-87030 Rende, Italy
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  • I. Aiello,

    1. Laboratory for the Synthesis, Characterization, and Applications of Molecular Materials (LASCAMM)—Unità INSTM della Calabria, Dipartimento di Chimica, Università della Calabria, I-87030 Rende, Italy
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  • D. Dattilo,

    1. Laboratory for the Synthesis, Characterization, and Applications of Molecular Materials (LASCAMM)—Unità INSTM della Calabria, Dipartimento di Chimica, Università della Calabria, I-87030 Rende, Italy
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  • M. Ghedini,

  • A. Golemme

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  • We thank A. Crispini for the X-ray diffraction patterns, G. Carbone for his help with AFM and E. Perrotta for the acquisition of TEM images. Supported in part by CIPE grants (Clusters 14 and 26) and by MIUR through a PRIN grant.

Abstract

Photorefractive polymeric nanosized dispersions of crystalline materials with high dynamic range have been developed using controlled phase-separation techniques. Orientational birefringence is induced by internal electric fields via the dielectric anisotropy of crystalline domains, rather than through the usual reorientation of molecular dipoles. This more efficient mechanism can increase photorefractive performance by two orders of magnitude and can in principle be applied to optimize other materials for a variety of applications, including medical imaging and image processing.

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