Radiative energy bandgap of nanostructures coupled with quantum emitters around the epsilon-near-zero (ENZ) frequency

TL;DR

This paper introduces the concept of a radiative energy bandgap in ENZ nanostructures coupled with quantum emitters, showing suppression and enhancement of emission around the ENZ frequency, with potential applications in quantum information storage.

Contribution

It proposes the novel concept of a radiative energy bandgap in ENZ materials coupled with quantum emitters, highlighting size-invariant suppression and enhancement of emission.

Findings

Radiative emission can be suppressed or enhanced around the ENZ frequency.

The suppression is invariant with respect to particle size.

Potential application in quantum information storage.

Abstract

Epsilon-near-zero (ENZ) materials have been demonstrated to exhibit unique electromagnetic properties. Here we propose the concept of radiative energy bandgap for an ENZ nanoparticle coupled with a quantum emitter (QE). The radiative emission of the coupled QE-nanoparticle can be significantly suppressed around the ENZ frequency and substantially enhanced otherwise, yielding an effective energy bandgap for radiation. This suppression is effectively invariant with respect to the particle size and is therefore an intrinsic property of the ENZ material. Our concept also heralds an alternative pathway to quench the emission from a QE, which may find potential application in quantum information storage.