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The piezo-induced second-order nonlinear optical effect in polyvinyl alcohol/YAB:Cr nanocomposites

机译:聚乙烯醇/ YAB:Cr纳米复合材料的压电诱导二阶非线性光学效应

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Piezo-induced picosecond nonlinear optical effects are investigated in polyvinyl alcohol photopolymer doped by YAB:Cr nanocrystallites of 10-40 nm size. The second harmonic generation (SHG) is studied versus the applied uniaxial mechanical stress up to 20 GPa. The observed phenomena are explained within a framework of fifth-order nonlinear optical susceptibilities with the inclusion of piezo-induced phonons, which favour the observed non-centrosymmetric electron-phonon anharmonicity. The substantial role of the nanocrystalline confinement effect in the observed phenomenon is demonstrated through the size-dependent behaviour of the effective second-order susceptibility. Quantum chemical and molecular dynamics simulations of the observed phenomenon are carried out.
机译:在由10-40 nm尺寸的YAB:Cr纳米微晶掺杂的聚乙烯醇光聚合物中,研究了压电诱导的皮秒非线性光学效应。研究了相对于施加的单轴机械应力(高达20 GPa)的二次谐波产生(SHG)。在五阶非线性光学磁化率的框架内解释了观察到的现象,其中包括压电感应声子,这有利于观察到的非中心对称电子-声子非谐性。通过有效的二阶磁化率的尺寸依赖性行为证明了纳米晶体限制作用在观察到的现象中的重要作用。对观察到的现象进行了量子化学和分子动力学模拟。

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