title: Polarimetric response of magnetodielectric core-shell nanoparticles: an analysis of scattering directionality and sensing.
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.
authors.affiliation: Grupo de Óptica, Departamento de Física Aplicada, Universidad de Cantabria, Facultad de Ciencias, Avda. Los Castros s/n, 39005 Santander, Spain.
authors.forename: Ángela I
authors.initials: ÁI
authors.lastname: Barreda
authors.forename: Yael
authors.initials: Y
authors.lastname: Gutiérrez
authors.forename: Juan M
authors.initials: JM
authors.lastname: Sanz
authors.forename: Francisco
authors.initials: F
authors.lastname: González
authors.forename: Fernando
authors.initials: F
authors.lastname: Moreno