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23 October 1998 Grating competition effects in photorefractive polymers
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Multiple grating phenomena have been observed in a number of photorefractive systems, and interaction between such gratings has been proposed as the basis for the demonstration of interesting optical effects such as velocity filtering and image deafferentation. We are investigation grating interactions in azo-dye doped photorefractive polymers with a view to assessing their suitability for use in such information processing applications. We report the result of wave-mixing investigations on two photorefractive polymer systems. The first system is a conventional guest-host photorefractive polymer based on the photoconducting host PVK:ECZ:TNF and the nonlinear chromophore trans-4-N,N-diethylamino-(E)- cinnamonitrile (DEACST). The results of degenerate four wave mixing and two beam coupling experiments in this composite are described well by the orientational enhancement model. The second system is a hybrid composite consisting of PVK:DEACST:ECZ:TNF and the well known azo-dye disperse red 1. In this system, gratings may be written via the photochemical mechanism of photoisomerization as well as the photorefractive effect. We suggest that the diffraction behavior of the hybrid composite involves a disruption of the light-induced azo-dye molecular orientation by the space charge field.
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Mark A. Smith, Geoffrey R. Mitchell, and Sean V. O'Leary "Grating competition effects in photorefractive polymers", Proc. SPIE 3471, Xerographic Photoreceptors and Organic Photorefractive Materials IV, (23 October 1998);

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