Grupo de Óptica, Departamento de Física Aplicada, Universidad de Cantabria, Facultad de Ciencias, Avda. Los Castros s/n, 39005 Santander, Spain.
Nanotechnology. 2016 Jun 10;27(23):234002. doi: 10.1088/0957-4484/27/23/234002. Epub 2016 May 3.
The influence of increasing the core size of Ag-Si core-shell nanoparticles has been investigated by using the values of the linear polarization degree at a right-angle scattering configuration, [Formula: see text]. Changes in dipolar resonances and scattering directionality conditions as a function of the core radius (R int) for a fixed shell size ([Formula: see text] nm) have been analysed. An empirical formula to obtain the ratio [Formula: see text] by monitoring the influence of the magnetic dipolar resonance in [Formula: see text] has been found. The effect of the refractive index of the surrounding medium, m med, in the zero backward and almost-zero forward scattering conditions has also been studied. We have weighed up the sensitivity of [Formula: see text] to m med. It has been demonstrated that multipolar contributions strongly influence [Formula: see text]. This influence can be used as a fast m med estimate. In all cases, the results show that the bigger the cores, the higher the sensitivity to m med.
通过使用直角散射配置下的线偏振度值 [Formula: see text]，研究了增加 Ag-Si 核壳纳米粒子核大小的影响。分析了固定壳大小 ([Formula: see text] nm) 时，偶极共振和散射方向性条件随核半径 (R int) 的变化。通过监测 [Formula: see text] 中磁偶极共振的影响，找到了获得比值 [Formula: see text] 的经验公式。还研究了周围介质折射率 m med 在零后向和几乎零前向散射条件下的影响。我们权衡了 [Formula: see text] 对 m med 的灵敏度。结果表明，多极贡献强烈影响 [Formula: see text]。这种影响可以用作 m med 的快速估计。在所有情况下，结果表明，核越大，对 m med 的灵敏度越高。
