Fano-control of down-conversion in a nonlinear crystal embedded with plasmonic-quantum emitter hybrid structures

TL;DR

This paper demonstrates how plasmonic-quantum emitter dimers embedded in a nonlinear crystal can significantly enhance frequency down-conversion through Fano interference effects, achieving over 100-fold improvements.

Contribution

It introduces a novel method of controlling nonlinear frequency conversion throughout a crystal using plasmonic-quantum emitter dimers to induce Fano resonances.

Findings

Achieved over two orders of magnitude enhancement in down-conversion.

Demonstrated control of nonlinear response via Fano interference.

Enhanced conversion efficiency beyond localization effects.

Abstract

Control of nonlinear response of nanostructures via path interference effects, i.e., Fano resonances, has been studied extensively. In such studies, a frequency conversion process takes place near a hot spot. Here, we study the case where the frequency conversion process takes place \textit{along the body of a nonlinear crystal}. Metal nanoparticle-quantum emitter dimers control the down-conversion process, taking place throughout the crystal body, via introducing interfering conversion paths. Dimers behave as interaction centers. We show that a 2 orders of magnitude enhancement is possible, on top of the enhancement due to localization effects. That is, this factor multiplies the enhancement taking place due to the field localization.