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Results in Physics

Spectral narrowing in the resonance fluorescence of a driven V-type quantum emitter near a two-dimensional plasmonic nanostructure array

Spyridon G. Kosionis, Vassilios Yannopapas, Emmanuel Paspalakis

Published Dec 15, 2024• 3 citations
Publisher

Abstract

We investigate the incoherent resonance fluorescence spectrum emitted by a three-level V-type quantum emitter, under the influence of a two-dimensional plasmonic nanosphere array. The V-type quantum system is driven by a coherent electromagnetic field whilst quantum interference effects in the spontaneous emission due to the presence of the plasmonic nanostructure are accounted for. The characteristics of the incoherent resonance fluorescence spectrum are studied, for different sets of parameters, aiming at the specification of the conditions under which an outstanding spectral narrowing, or either, quenching effects are manifested.

DOI
10.1016/j.rinp.2024.108084

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We investigate the incoherent resonance fluorescence spectrum emitted by a three-level V-type quantum emitter, under the influence of a two-dimensional plasmonic nanosphere array. The V-type quantum system is driven by a coherent electromagnetic field whilst quantum interference effects in the spontaneous emission due to the presence of the plasmonic nanostructure are accounted for. The characteristics of the incoherent resonance fluorescence spectrum are studied, for different sets of parameters, aiming at the specification of the conditions under which an outstanding spectral narrowing, or either, quenching effects are manifested.
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We present a theoretical study of the resonance fluorescence of a four-level double-V\mathsf{V}V-type quantum emitter near a plasmonic nanostructure. The quantum system interacts with two orthogonal circularly polarized laser fields with the same frequency and intensity, but with different phases. For the plasmonic nanostructure we consider a two-dimensional array of metal-coated dielectric nanospheres. We show that the presence of the plasmonic nanostructure leads to strong modification of both the resonance fluorescence spectrum and the transition from antibunching to bunching for the fluorescent photons. In addition, we show that both the resonance fluorescence spectrum and the second-order correlation function are strongly phase-dependent so that the relative phase of laser fields can be used for the efficient control of the resonance fluorescence characteristics. The results are explained by using a dressed-state picture.
We investigate optical effects in a three-level VVV-type quantum system involving two closely situated upper levels (a doublet), interacting with a weak probe field while located near a two-dimensional array of metal-coated dielectric nanospheres. We demonstrate that the presence of the plasmonic nanostructure leads to a significant modification of the absorption and dispersion properties of the quantum VVV system, yielding either very narrow resonances or induced transparency for the weak probe field. Introducing a weak incoherent pumping field can result in gain with and without population inversion in the quantum system, without the need for a strong coherent pump field. Such a gain can be controlled by varying the distance of the quantum system from the plasmonic nanostructure and by adjusting the amount of incoherent pumping, as well as the doublet splitting. The threshold limits are provided both analytically and numerically for achieving gain with and without inversion using the incoherent pumping. Our analysis paves the way toward further theoretical and experimental studies for mitigating dissipative losses in plasmonic modes when the gain is difficult to achieve due to impractical pumping requirements.
It has been recently shown that the placement of a three-level V\mathsf{V}V-type quantum emitter in the proximity of metallic nanostructures can create dynamics similar to that of quantum interference in spontaneous emission. Here we continue this work and present results on the population dynamics of a three-level V-type quantum emitter for various initial conditions in the presence of a two-dimensional array of metal-coated dielectric nanospheres.
We study theoretically the effects of the presence of a plasmonic nanostructure on free-space spontaneous emission in a four-level quantum system, where one V\mathsf{V}V-type transition is influenced by the interaction with surface plasmons and the other V\mathsf{V}V-type transition occurs in free space. The plasmonic nanostructure that we consider is a two-dimensional array of metal-coated dielectric nanospheres. We show that the spectrum of spontaneous emission in the free-space modes is strongly influenced by the presence of the plasmonic nanostructure, and we explore the dependence of the spectrum on different initial conditions of the quantum system and on the distance from the nanostructure.
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