2 November 2011 Highly efficient photorefractive polymers doped with cyano nonlinear chromophores
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In this work we report new highly efficient organic photorefractive polymers based on aryl-cyano non-linear chromophores [(4-(diethylamino)-2-hydroxybenzylideneamino]benzonitrile (CN-C-OH) and [4-(diethylamino) benzylideneamino]benzonitrile (CN-S-OH). The PR polymer blends are composed by the photoconductor poly (9-vinylcarbazole) and plasticizer 9-ethylcarbazole PVK:ECZ matrix, as well as the sensitizer fullerene C60. Holographic experiments in a tilted four wave mixing (FWM) and two beam coupling (TBC) geometry were carried out by using a 10 mW He-Ne laser (633 nm). The experiments were performed at room temperature to measure the electric field steady-state diffraction efficiency dependence of the PR composites. High diffraction efficiency as high as 90 % was observed for polymers based on CN-C-OH at 25 wt. % doping level and an external applied electric field around 56 V/μm. The μβ product was also measured by EFISH technique for compounds CN-C-OH and CN-S-OH, results showed that CN-C-OH present a value 3.5 times higher than CN-S- OH, which is supported by a theoretical prediction. Demonstration of fast reversible holographic imaging (~0.5 s) by using these highly efficient organic photorefractive polymers based on CN-C-OH and CN-S-OH is presented.
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V. M. Herrera, V. M. Herrera, J. L. Maldonado, J. L. Maldonado, M. Rodríguez, M. Rodríguez, G. Ramos-Ortíz, G. Ramos-Ortíz, M. A. Meneses-Nava, M. A. Meneses-Nava, O. Barbosa-García, O. Barbosa-García, R. Santillán, R. Santillán, N. Farfán, N. Farfán, P. Lacroix, P. Lacroix, "Highly efficient photorefractive polymers doped with cyano nonlinear chromophores", Proc. SPIE 8011, 22nd Congress of the International Commission for Optics: Light for the Development of the World, 80115Q (2 November 2011); doi: 10.1117/12.903475; https://doi.org/10.1117/12.903475

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