Light guiding and switching using eccentric core-shell geometries

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.

Mantle cloaking due to ideal magnetic dipole scattering

“…Apart from fundamentally important transformation optics (TO) technique, the plasmonic cloaking (PC) and mantle cloaking (MC) [49][50][51][60][61][62]65,66 are more common from a practical point of view. In literature, different approaches to control the scattering of light are found [67][68][69][70][71][72][73][74][75][76][77] . In particular, MC differs from others since it does not require bulk anisotropic materials and is realized by using a thin layer metasurface usually consisting of a periodic arrangement of unit cells.…”

Selective Third-Harmonic Generation by Structured Light in Mie-Resonant Nanoparticles

“…With those further important extensions, we anticipate that the generalized Kerker effects discussed above can emerge in other fields and also affect other advanced and intriguing photonic effects, including the quantum [163], low-dimensional [164,165] and topological [165,166] systems, as well as make an impact on the studies of geometric phases [167,168], bandgap structures [169], Anderson localization [170], and non-Hermitian photonics [171], also proliferating the applications ranging from the scattering control and wave guidance [172] to more advanced phenomena including optical force control [78], thermal emission engineering [173], quantum interference and entanglement management [174,175], in both linear and nonlinear regimes [167,176]. It is also significant to establish connections between the scattering of electromagnetic waves and scattering of other types of waves from the perspective of partial wave interferences [177][178][179][180][181][182], so that the principles of generalized Kerker effects could be explored in other fields, inspiring interdisciplinary studies and practical applications.…”

The Quest for Low Loss High Refractive Index Dielectric Materials for UV Photonic Applications

“…The full-forward condition, also known as the first Kerker condition, maximizes the scattered intensity in the forward direction while it minimizes the backward one. This situation has found a great utility in light guiding and light trapping applications [11,[54][55][56][57].…”