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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 >Crystallization effect on non-linear optical response of silicate glass and glass-ceramics containing gold nanoparticles
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Crystallization effect on non-linear optical response of silicate glass and glass-ceramics containing gold nanoparticles

机译：结晶对硅酸盐玻璃和含金纳米粒子的玻璃陶瓷非线性光学响应的​​影响

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摘要

Silicate glasses and glass-ceramics containing gold nanoparticles have been prepared by a conventional melt-quenching method and the subsequent two-step heat treatment processes. The relaxation time of non-linear optical response of the gold nanoparticles has been evaluated from femtosecond pump-probe measurements. The gold nanoparticles are precipitated through a heat treatment. A second heat treatment leads to the precipitation of Li2SiO3 nanocrystals on the gold nanoparticles. The relaxation of non-linear optical response consists of two components; one is a fast relaxation within a few picoseconds, which originates from an electron-phonon coupling process, and the other is a slow relaxation due to a thermal diffusion of excess heat from nanoparticles to the glass matrix. Crystallization does not affect the relaxation of the fast component, while the relaxation time of the slow component decreases with an increase in the degree of crystallinity. We propose that the increased thermal conductivity in precipitated crystals, i.e., Li2SiO3 nanocrystals, leads to the increase in the speed of the relaxation process which works by thermal diffusion from metal particles to the matrix. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 25]
机译：含金纳米颗粒的硅酸盐玻璃和玻璃陶瓷已通过常规的熔融淬火方法和随后的两步热处理工艺制备。金纳米颗粒的非线性光学响应的​​弛豫时间已通过飞秒泵浦探针测量进行了评估。金纳米颗粒通过热处理沉淀。第二次热处理导致Li2SiO3纳米晶体在金纳米颗粒上沉淀。非线性光学响应的​​松弛包括两个部分：一种是在几皮秒内的快速弛豫，这是由于电子-声子耦合过程引起的，另一种是缓慢的弛豫，这是由于多余的热量从纳米粒子到玻璃基质的热扩散所致。结晶不会影响快速组分的弛豫，而慢速组分的弛豫时间会随着结晶度的增加而减少。我们提出，在沉淀的晶体即Li 2 SiO 3纳米晶体中增加的热导率导致弛豫过程的速度增加，该弛豫过程的速度通过从金属颗粒到基体的热扩散来起作用。 （C）2001 Elsevier Science B.V.保留所有权利。 [参考：25]

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