Interplay of magnetic responses in all-dielectric oligomers to realize magnetic Fano resonances

TL;DR

This paper investigates how collective and individual magnetic responses in all-dielectric nanoparticle clusters can produce unique magnetic Fano resonances, with theoretical and experimental validation in silicon quadrumers.

Contribution

It introduces a new type of magnetic Fano resonance in all-dielectric nanostructures, supported by both theoretical analysis and RF experiments.

Findings

Multiple magnetic resonances observed in dielectric quadrumers

Experimental demonstration of magnetic Fano resonances in RF setup

Theoretical analysis confirms the interplay of magnetic responses

Abstract

We study the interplay between collective and individual optically-induced magnetic responses in quadrumers made of identical dielectric nanoparticles. Unlike their plasmonic counterparts, all-dielectric nanoparticle clusters are shown to exhibit multiple dimensions of resonant magnetic responses that can be employed for the realization of anomalous scattering signatures. We focus our analysis on symmetric quadrumers made from silicon nanoparticles and verify our theoretical results in proof-of-concept radio frequency experiments demonstrating the existence of a novel type of magnetic Fano resonance in nanophotonics.