Perfect Nonradiating Modes in Dielectric Nanoparticles

TL;DR

This paper introduces the concept of perfect nonradiating modes in dielectric nanoparticles, demonstrating their existence, properties, and potential applications in nanotechnology and nonlinear optics.

Contribution

It proves the existence of perfect nonradiating modes in axisymmetric dielectric nanoparticles and shows how to excite them for practical applications.

Findings

Existence of perfect nonradiating modes with infinite Q-factors

Deep minima in scattering spectra indicating these modes

Giant field amplification inside nanoparticles

Abstract

A general concept of perfect nonradiating modes in dielectric nanoparticles of an arbitrary shape is put forward. It is proved that such modes exist in axisymmetric dielectric nanoparticles and have unlimited radiative Q-factors. With smart tuning of the excitation beams, perfect modes appear as deep minima in the scattered radiation spectra (up to complete disappearance), but at the same time, they have a giant amplification of the fields inside the particle. Such modes have no analogs and can be useful for the realization of nanosensors, low threshold nanolasers, and other strong nonlinear effects in nanoparticles.