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Photoinduced anisotropy and polarization holographic gratings formed in Ag/TiO2 nanocomposite films

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Abstract

Formation of anisotropy and polarization holographic gratings (ss, pp, and sp) in Ag/TiO2 nanocomposite films were investigated using Nd:YAG lasers (532 nm) as pumping and writing source, respectively. The observations can be well explained by the anisotropic photodissolution of Ag nanoparticles, the photomobility and reduction of Ag+ ions, and the light scattering induced by Ag nanoparticles. Taking these effects into account, a phenomenological model based on simultaneous formation of the absorption grating and the two coupling phase gratings is proposed and found to be in good agreement with the measurements. The main differences in the three polarization grating formation processes are also discussed.

©2012 Optical Society of America

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