Photoinduced anisotropy and polarization holographic gratings formed in Ag/TiO2 nanocomposite films
Photoinduced anisotropy and polarization holographic gratings formed in Ag/TiO2 nanocomposite films
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Ag/TiO2 纳米复合薄膜中形成的光致各向异性和偏振全息光栅
DOI：
10.1364/ao.51.003357
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发表时间：
2012-06-01
期刊：
影响因子：
1.9
通讯作者：
Liu, Yichun
中科院分区：
文献类型：
--
作者：
Fu, Shencheng;Zhang, Xintong;Liu, Yichun
利用532 nm激光作为泵浦源和写入源，研究了各向异性和偏振全息光栅(S-S、p-p和S-p)在Ag/Ti02纳米复合薄膜中的形成。银纳米颗粒的光解各向异性、银+离子的光致伸缩和还原以及银纳米颗粒引起的光散射可以很好地解释这一现象。考虑到这些影响，提出了一种基于吸收光栅和两个耦合位相光栅同时形成的唯象模型，并与测量结果吻合较好。文中还讨论了三种偏振光栅形成过程的主要区别。(C)2012年美国光学学会
Formation of anisotropy and polarization holographic gratings (s-s, p-p, and s-p) 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. (C) 2012 Optical Society of America