Abstract There is a growing interest in bimetallic core shell nanostructures that comprised out of noble metals due to their fascinating plasmonic properties, leading to a wide range of applications in future nanotechnology. Here we report on Ag/Cu core shell nanostructures in a glass matrix. It includes novel approaches for characterizing embedded core shell nanostructures with a detailed study on the nanosize effect in tuning their optical and nonlinear optical properties along with biomedical applications. Annealing the Ag/Cu as- exchanged samples resulted in the formation of core-shell nanostructures, which were confirmed using UV–vis absorption spectroscopy and high-resolution transmission electron microscopy. The prepared plasmonic nanostructures were further studied using X-ray diffraction, Rutherford backscattering, photoluminescence, Raman, X-ray photoelectron spectroscopy and Z scan techniques. The nonlinear optical properties of the glasses containing bimetallic nanoparticles have been studied at a non-resonant wavelength using femtosecond laser pulses and a possible mechanism for the observed nonlinearity have been explained.

中文翻译：

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用于光子学应用的玻璃基体中纳米结构的等离子体和非线性光学行为

摘要 由于贵金属具有迷人的等离子体特性，人们对双金属核壳纳米结构越来越感兴趣，从而在未来的纳米技术中得到广泛的应用。在这里，我们报告了玻璃基质中的 Ag/Cu 核壳纳米结构。它包括表征嵌入式核壳纳米结构的新方法，详细研究了纳米尺寸效应在调整其光学和非线性光学特性以及生物医学应用方面的作用。对交换后的 Ag/Cu 样品进行退火导致核壳纳米结构的形成，使用紫外-可见吸收光谱和高分辨率透射电子显微镜证实了这一点。使用 X 射线衍射、卢瑟福背散射、光致发光、拉曼、X 射线光电子能谱和 Z 扫描技术。已经使用飞秒激光脉冲在非共振波长研究了含有双金属纳米粒子的玻璃的非线性光学特性，并解释了观察到的非线性的可能机制。