Dynamics of a quantum emitter resonantly coupled to both external field and localized surface plasmon

TL;DR

This paper explores how a quantum emitter coupled with a metal nanoparticle and external field exhibits modified Rabi oscillations and satellite frequencies, with potential applications in nanoscale distance control.

Contribution

It demonstrates the influence of localized surface plasmon feedback on quantum emitter dynamics under strong external resonant fields, revealing new spectral features.

Findings

Presence of additional satellite frequencies in the radiation spectrum.

Strong dependence of high harmonic ratios on QDE-MNP separation.

Potential for nanoscale distance measurement and control.

Abstract

We investigate excitation dynamics in the system of a quantum dipole emitter (QDE) coupled to a located nearby metal nanoparticle (MNP), which exhibits a dipolar localized surface plasmon (LSP) resonance at the frequency of the QDE radiative transition, in the presence of a strong external resonant electromagnetic field. Considering the QDE-field interactions in the regime of strong QDE-field coupling, we show that the feedback provided by the MNP on the QDE (due to the LSP excitation with the field generated by the dipole moment of the QDE transition) influences significantly the coherent process of Rabi oscillations, resulting in the occurrence of additional satellite frequencies in the radiation spectrum scattered by the QDE-MNP configuration. The relative ratio of high harmonics depends strongly on the QDE-MNP separation, an important characteristic feature that can be used for observing this effect and exploited, for example, for controlling distances at nanoscale.