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Linear and nonlinear optical characteristics of ZnO-SiO_(2) nanocomposites

机译：ZnO-SiO_（2）纳米复合材料的线性和非线性光学特性

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We present the spectral and nonlinear optical properties of ZnO-SiO_(2) nanocomposites prepared by colloidal chemical synthesis. Obvious enhancement of ultraviolet (UV) emission of the samples is observed, and the strongest UV emission of a typical ZnO-SiO_(2) nanocomposite is over three times stronger than that of pure ZnO. The nonlinearity of the silica colloid is low, and its nonlinear response can be improved by making composites with ZnO. These nanocomposites show self-defocusing nonlinearity and good nonlinear absorption behavior. The observed nonlinear absorption is explained through two photon absorption followed by weak free carrier absoption and nonlinear scattering. The nonlinear refractive index and the nonlinear absorption increase with increasing ZnO volume fraction and can be attributed to the enhancement of exciton oscillator strength. ZnO-SiO_(2) is a potential nanocomposite material for the UV light emission and for the development of nonlinear optical devices with a relatively small limiting threshold.
机译：我们介绍了通过胶体化学合成制备的ZnO-SiO_（2）纳米复合材料的光谱和非线性光学性质。观察到样品的紫外（UV）发射明显增强，典型的ZnO-SiO_（2）纳米复合材料的最强UV发射比纯ZnO强3倍以上。二氧化硅胶体的非线性很低，并且可以通过与ZnO制成复合材料来改善其非线性响应。这些纳米复合材料表现出自散焦非线性和良好的非线性吸收行为。观察到的非线性吸收是通过两个光子吸收，弱的自由载流子吸收和非线性散射来解释的。非线性折射率和非线性吸收随着ZnO体积分数的增加而增加，并且可以归因于激子振荡器强度的提高。 ZnO-SiO_（2）是一种潜在的纳米复合材料，用于紫外光发射和具有相对较小的极限阈值的非线性光学器件的开发。

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