Abstract
High Refractive Index (HRI) dielectric nanoparticles have been proposed as an alternative to metallic ones due to their low absorption and magnetodielectric response in the VIS and NIR ranges. For the latter, important scattering directionality effects can be obtained. Also, systems constituted by dimers of HRI dielectric nanoparticles have shown to produce switching effects by playing with the polarization, frequency or intensity of the incident radiation. Here, we show that scattering directionality effects can be achieved with a single eccentric metallo-HRI dielectric core-shell nanoparticle. As an example, the effect of the metallic core displacements for a single Ag-Si core-shell nanoparticle has been analyzed. We report rotation of the main scattering lobe either clockwise or counterclockwise depending on the polarization of the incident radiation leading to new scattering configurations for switching purposes. Also, the efficiency of the scattering directionality can be enhanced. Finally, chains of these scattering units have shown good radiation guiding effects, and for 1D periodic arrays, redirection of diffracted intensity can be observed as a consequence of blazing effects. The proposed scattering units constitute new blocks for building systems for optical communications, solar energy harvesting devices and light guiding at the nanoscale level.
Highlights
Nanotechnology has revolutionized science of the last decades by generating important theoretical and practical developments
We show that an isolated eccentric core-shell nanoparticle can operate as an optical switching device in a similar way to the one proposed by Barreda et al.[31], based on an homogeneous dimer made of High Refractive Index (HRI) dielectric NPs
As the core size increases, some interesting properties arise for the different core displacements
Summary
Nanotechnology has revolutionized science of the last decades by generating important theoretical and practical developments. High Refractive Index (HRI) dielectric NPs have been proposed instead as ideal candidates for solving this issue[5] because light can propagate inside them without being absorbed They can present magnetic properties in spite of being non-magnetic materials in nature[6]. When electric and magnetic spectral resonances overlap, coherence effects appear, leading to a real control of the directionality of the scattered light This has permitted to redirect the incident radiation in forward, backward or at given scattering angles with respect to the incident direction[10,11,12]. We will pay attention to the electromagnetic behavior of eccentric metallo-dielectric core-shell NPs where the shell is made of a HRI dielectric material
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