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Photoinduced anisotropy and polarization holographic gratings formed in Ag/TiO_(2) nanocomposite films

机译:Ag / TiO_(2)纳米复合薄膜中形成的光致各向异性和偏振全息光栅

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摘要

Formation of anisotropy and polarization holographic gratings (s-s, p-p, and s-p) in Ag/TiO_(2) 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.
机译:以Nd:YAG激光器(532 nm)为泵浦源和写入源分别研究了Ag / TiO_(2)纳米复合膜中各向异性和偏振全息光栅(s-s,p-p和s-p)的形成。 Ag纳米粒子的各向异性光溶解,Ag〜(+)离子的光迁移和还原以及Ag纳米粒子引起的光散射可以很好地解释这些观察结果。考虑到这些影响,提出了基于同时形成吸收光栅和两个耦合相位光栅的现象学模型,发现该模型与测量结果吻合良好。还讨论了三种偏振光栅形成过程中的主要区别。

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