Ag-enriched ZnO nanoparticles (NPs) are prepared by using silver nitrate, zinc acetate, and N,N-dimethylformamide (DMF) as source elements, a novel method under particular conditions without any additives added as stabilizing or reducing agent. The transmission electron microscopic (TEM) studies reveal that the ZnO layer is well formed onto the Ag core. The photoluminescence shows the energy transfer and electron-hole recombination between the conductor and semiconductor layers. Nonlinear optical properties are studied by using picosecond laser. Nonlinear absorption values are increased by increasing the Ag concentration in Ag-enriched ZnO NPs. Nonlinear optical effects in Ag-enriched ZnO NPs are due to two-photon induced free carrier and inter-band transitions. Optical limiting characteristics are measured in the picosecond time domain. Ag-enriched ZnO NPs are used as optical limiters in the visible region.

中文翻译：

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富银 ZnO 纳米结构的非线性光学性质

通过使用硝酸银、乙酸锌和 N,N-二甲基甲酰胺 (DMF) 作为源元素制备富银 ZnO 纳米粒子 (NPs)，这是一种在特定条件下不添加任何添加剂作为稳定剂或还原剂的新方法。透射电子显微镜 (TEM) 研究表明，ZnO 层很好地形成在 Ag 芯上。光致发光显示了导体层和半导体层之间的能量转移和电子-空穴复合。使用皮秒激光研究非线性光学特性。通过增加富Ag ZnO NPs 中的Ag 浓度来增加非线性吸收值。富Ag ZnO NPs 中的非线性光学效应是由于双光子诱导的自由载流子和带间跃迁。光限制特性是在皮秒时域中测量的。