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Nonlinear optical properties and optical limiting measurements of graphene oxide - Ag@TiO2 compounds

机译：氧化石墨烯-Ag @ TiO2化合物的非线性光学性质和光学极限测量

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In this work Graphene Oxide (GO), Ag@TiO2 core-shells and GO-Ag@TiO2 compounds were prepared and experimentally verified. Using a low power laser diode with 532 nm wavelength, the magnitude and the sign of the nonlinear refractive index and nonlinear absorption were determined by the Z-scan technique. It was observed that the nonlinear absorption of GO-Ag@TiO2 mixture was higher than pure GO. The optical limiting effect of these samples was also investigated using the 2nd harmonics of a pulsed Nd-YAG laser at 532 nm. Our results showed that the sole Ag@TiO2 didn't show any appreciable optical limiting effect, however after just mixing with graphene oxide the threshold of optical limiting was increased and the compound showed an enhancement of optical limiting behavior compared to GO itself. The presented results are discussed and compared with other literature reports. (C) 2016 Elsevier B.V. All rights reserved.
机译：在这项工作中，制备了石墨烯氧化物（GO），Ag @ TiO2核壳和GO-Ag @ TiO2化合物，并进行了实验验证。使用波长为532 nm的低功率激光二极管，通过Z扫描技术确定了非线性折射率和非线性吸收的幅度和符号。观察到，GO-Ag @ TiO2混合物的非线性吸收高于纯GO。还使用脉冲Nd-YAG激光在532 nm的二次谐波研究了这些样品的光学限制效应。我们的结果表明，单一的Ag @ TiO2没有表现出任何明显的光学限制作用，但是与GO相比，仅与氧化石墨烯混合后，光学限制的阈值增加，并且该化合物显示出光学限制行为的增强。讨论了提出的结果，并与其他文献报告进行了比较。 （C）2016 Elsevier B.V.保留所有权利。

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