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16 December 1993 Photorefractive polymer materials
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Photorefractivity, or reversible photoinduced refractive index change, was first observed about twenty-five years ago in inorganic crystals. The photorefractive effect involves generation, transport and trapping of charges and a change of the refractive index through the electro-optic effect. We have synthesized a photorefractive crosslinked polymer material in which the active components, derivatives of diethylaminobenzaldehyde diphenylhydrazone and para- nitroaniline, are chemically linked into the polyurethane network. During the crosslinking of the polyurethane the para-nitroaniline groups were aligned (poled) by an external electric field, which resulted in a non-centrosymmetric polymer material. This material was shown to be photorefractive by the two beam coupling experiment, without the application of an external electric field.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Henk J. Bolink, Victor V. Krasnikov, George G. Malliaras, and Georges Hadziioannou "Photorefractive polymer materials", Proc. SPIE 2025, Nonlinear Optical Properties of Organic Materials VI, (16 December 1993);

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