15 October 1996 Theoretical and experimental studies of photorefractivity in novel polymeric composites
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Abstract
We present results of temperature dependence studies of photorefractive effect in a polymeric composite PVK:TCP:C60:DEANST. At elevated temperature, decreased rigidity of the host matrix leading to increased orientational mobility of the second-order nonlinear chromophores results in enhanced photorefractive performance. Diffraction efficiency approaching 100% and enhanced two-beam coupling gain coefficients are reported. The influence of temperature on the speed of photorefractive response is measured and discussed. We also report on a novel photorefractive polymeric composite. A new chromophore, 4-[N-(2- hydroxyethyl)-N-(methyl)amino phenyl]-4'-(6-hydroxyhexyl sulfonyl)stilbene, abbreviated as APSS, possessing high transparency over a broad wavelength, is used together with a PVK:TCP:C60 matrix. This composite shows high photorefractive figures of merit at 488, 514.5 and 632.8 nm. Diffraction efficiencies up to 40%, as well as net two-beam coupling gains of 60 cm-1 have been achieved at these wavelengths.
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Bogdan Swedek, Paras N. Prasad, Yiping Cui, Ning Cheng, Jaroslaw W. Zieba, Jeffrey Winiarz, Kie-Soo Kim, "Theoretical and experimental studies of photorefractivity in novel polymeric composites", Proc. SPIE 2850, Organic Photorefractive Materials and Xerographic Photoreceptors, (15 October 1996); doi: 10.1117/12.254234; https://doi.org/10.1117/12.254234
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