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Polarimetric response of magnetodielectric core-shell nanoparticles: an analysis of scattering directionality and
Ángela I Barreda1, Yael Gutiérrez1, Juan M Sanz1,2
1Grupo de Óptica, Departamento de Física Aplicada, Universidad de Cantabria, Facultad de Ciencias, Avda. Los Castros s/n, 39005 Santander, Spain.
Abstract:
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.
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