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首页> 外文期刊>Applied optics >Layered silver nanoparticles embedded in a BaF_(2) matrix: optical characterization
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Layered silver nanoparticles embedded in a BaF_(2) matrix: optical characterization

机译：嵌入BaF_（2）基质中的层状银纳米颗粒：光学表征

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摘要

Multilayer stacks of silver and BaF_(2) alternate layers have been deposited by thermal evaporation on a silica substrate with the aim to obtain Ag clusters dispersed in a BaF_(2) insulator matrix. The Ag layer thickness was approximately 1.2 nm; the thickness of the BaF_(2) layer was approximately 25 nm. The samples were thermally treated for a 1 h thermal annealing process at 500 deg C. These kinds of multilayer device also have several applications in the field of optics for the realization of antireflection coatings. However, optical characterization of dielectric matrices that contain layered metallic nanoparticles still remains an unsolved problem in the field of nanostructured optical coatings. Therefore, the surface plasmon resonance peak that appears in the optical absorption spectra because of the formation of Ag nanoclusters inside the BaF_(2) insulator matrix has been monitored and fitted by numerical codes. In particular, a previously published theoretical model, based on the Maxwell-Garnett effective medium theory, modified to take into account the effects that are due to the particle shapes and the spatial arrangement of the clusters, has been employed to fit the optical absorption spectra.
机译：银和BaF_（2）交替层的多层堆叠已通过热蒸发沉积在二氧化硅基板上，目的是获得分散在BaF_（2）绝缘体基体中的Ag团簇。 Ag层的厚度约为1.2nm。 BaF_（2）层的厚度约为25nm。将样品在500摄氏度下进行1小时的热退火处理。这些类型的多层设备在光学领域也有多种应用，可用于实现抗反射涂层。然而，在纳米结构的光学涂层领域中，包含层状金属纳米颗粒的介电基质的光学表征仍然是尚未解决的问题。因此，由于在BaF_（2）绝缘体基体内部形成了Ag纳米团簇而在光吸收光谱中出现的表面等离子体激元共振峰已经通过数字代码进行了监测和拟合。特别是，基于麦克斯韦-加纳特有效介质理论的先前发布的理论模型经过修改以考虑到由于粒子形状和团簇的空间排列而引起的影响，已被用于拟合光吸收光谱。

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