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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Local order and non-linear optical properties in bulk nanostructured niobiosilicate glasses
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Local order and non-linear optical properties in bulk nanostructured niobiosilicate glasses

机译：体纳米纳米生物硅酸盐玻璃的局部有序和非线性光学性质

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摘要

This communication presents and discusses an experimental proof of the correlation among local structure and second harmonic generation (SHG) in bulk nanostructured potassium niobiosilicate (KNS) glasses. In particular, SHG shows a maximum in correspondence of the early stages of nanostructuring, that are characterized by the segregation within the amorphous matrix of nanosized inhomogeneities. EXAFS experiments indicate that these inhomogeneities are determined by the maximum size reached by the niobium second coordination shell combined with the sudden inclusion of potassium atoms in it. Such rearrangement at the local level determines the maximum fluctuation of the bulk glass refractive index and in turn its maximum SHG activity.
机译：该交流介绍并讨论了块状纳米结构生物硅酸钾（KNS）玻璃中局部结构与二次谐波产生（SHG）之间相关性的实验证明。特别地，SHG在纳米结构的早期阶段显示出最大值，其特征在于纳米尺寸不均匀性的无定形基质内的偏析。 EXAFS实验表明，这些不均匀性是由铌第二配位壳达到的最大尺寸以及钾原子的突然夹杂所决定的。这种在局部水平的重排决定了块状玻璃折射率的最大波动，进而决定了其最大的SHG活性。

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