Divergent nonlinear optical response of three resonator system via Fano resonances

TL;DR

This paper demonstrates that Fano resonances in a three-particle system can significantly enhance nonlinear optical responses, surpassing previous limitations, with potential applications in second harmonic generation and spaser development.

Contribution

It introduces a novel interference scheme involving two quantum emitters and a plasmonic resonator to achieve over 7 orders of magnitude enhancement in nonlinear optical processes.

Findings

Enhancement factors exceeding 7 orders of magnitude are achievable.

Path interference from quantum emitters can overcome decay rate limitations.

A single hybrid system can account for most second harmonic radiation from plasmonic clusters.

Abstract

In a previous study, we have discovered that nonlinear processes can be enhanced several orders of magnitude due to the path interference effects which are introduced by Fano resonances. Emergence of this phenomenon has been demonstrated also in 3-dimensional solutions of Maxwell equations. However, enhancement has been found to be limited by the decay rate of the plasmonic oscillations. In the present work, we demonstrate that such a limitation can be lifted o? when the path interference from two quantum emitters to a plasmonic resonator (second harmonic converter) is considered. Enhancement factors much larger than 7 orders of magnitude are possible using such an interference scheme. Therefore, a single hybridized system of 3 particles (manufactured carefully) can account for almost all of the second harmonic generated radiation emitted from a sample of plasmonic particle clusters decorated with quantum emitters (e.g. a spaser).