Multipolar scattering analysis of hybrid metal-dielectric nanostructures

TL;DR

This paper systematically analyzes the multipolar scattering properties of hybrid metal-dielectric nanostructures, revealing tunable magnetic light and anapole states through geometric variations.

Contribution

It introduces a comprehensive multipolar analysis of hybrid nanoantennas, highlighting how structural changes influence their optical resonances and enabling control over magnetic light and anapole states.

Findings

Demonstrated magnetic light at energies above 1 eV by varying Ag height.

Achieved magnetic light below 1 eV with insulating spacing.

Observed narrow spectral features associated with anapole states.

Abstract

We perform a systematic study showing the evolution of the multipoles along with the spectra for a hybrid metal-dielectric nanoantenna, a Si cylinder and an Ag disk stacked one on top of another, as its dimensions are varied one by one. We broaden our analysis to demonstrate the "magnetic light" at energies above 1 eV by varying the height of the Ag on the Si cylinder and below 1 eV by introducing insulating spacing between them. We also explore the appearance of the anapole state along with some exceptionally narrow spectral features by varying the radius of the Ag disk.