Plasmonic Nonlocal Response Effects on Dipole Decay Dynamics in the Weak- and Strong-Coupling Regimes

Jurga, Radoslaw; D’Agostino, Stefania; Sala, Fabio Della; Ciracì, Cristian

doi:10.1021/acs.jpcc.7b07462

Cited by 27 publications

(27 citation statements)

References 61 publications

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“…While this is somehow expected in the QHT case because of the extra losses due to viscosity, it is a surprising result for the TF-HT. In fact, although similar systems have already been investigated by some of the authors of this article [70], this result has not been observed before. On the contrary, Tserkezis et al [56,71] have demonstrated robustness of strong coupling against nonlocal corrections, when collective emitters are considered.…”

Section: Spheresmentioning

confidence: 51%

“…Metallic structures that are characterized by few-nanometer or even sub-nanometer inter-particle distances achieve the largest optical field confinement [25,29] and smallest optical cavity volumes, and are ideal candidates for achieving single-molecule room temperature strong coupling [56,62,[70][71][72]. We consider dimers of Drude-like Na spheres of radius R and gap size g = 2d.…”

Section: Sphere Dimersmentioning

confidence: 99%

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Plasmonic quantum effects on single-emitter strong coupling

et al. 2019

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Coupling between electromagnetic cavity fields and fluorescent molecules or quantum emitters can be strongly enhanced by reducing the cavity mode volume. Plasmonic structures allow light confinement down to volumes that are only a few cubic nanometers. At such length scales, nonlocal and quantum tunneling effects are expected to influence the emitter interaction with the surface plasmon modes, which unavoidably requires going beyond classical models to accurately describe the electron response at the metal surface. In this context, the quantum hydrodynamic theory (QHT) has emerged as an efficient tool to probe nonlocal and quantum effects in metallic nanostructures. Here, we apply state-of-the-art QHT to investigate the quantum effects on strong coupling of a dipole emitter placed at nanometer distances from metallic particles. A comparison with conventional local response approximation (LRA) and Thomas-Fermi hydrodynamic theory results shows the importance of quantum effects on the plasmon-emitter coupling. The QHT predicts qualitative deviation from LRA in the weak coupling regime that leads to quantitative differences in the strong coupling regime. In nano-gap systems, the inclusion of quantum broadening leads to the existence of an optimal gap size for Rabi splitting that minimizes the requirements on the emitter oscillator strength.

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Section: Spheresmentioning

confidence: 51%

Section: Sphere Dimersmentioning

confidence: 99%

Plasmonic quantum effects on single-emitter strong coupling

et al. 2019

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“…Note that for gaps smaller than 5 nm, the nonlocal response of the metal may become pronounced, whereas our calculations of the coupling strength are based on the local model. This may have an unfavorable effect on the coupling strength as recent theoretical efforts suggest [70].…”

Section: B Comparative Study Of the Nanoantenna Geometrymentioning

confidence: 99%

Quantum description and emergence of nonlinearities in strongly coupled single-emitter nanoantenna systems

et al. 2018

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Käll, M. et al (2018) Quantum description and emergence of nonlinearities in strongly coupled single-emitter nanoantenna systems PHYSICAL REVIEW B, 98(4) http://dx.Realizing strong coupling between a single quantum emitter (QE) and an optical cavity is of crucial importance in the context of various quantum optical applications. Although Rabi splitting of single quantum emitters coupled to high-Q classical cavities has been reported in numerous configurations, attaining single emitter Rabi splitting with a plasmonic nanostructure remains a challenge. In particular, strong coupling at the single QE regime would open the path for the realization of single-photon nonlinearities. In this paper, we derive a plasmon quantization procedure for systems consisting of a single QE located in the gap of a nanoantenna. This procedure leads to the description of the quantum dynamics by a master equation for the state of the QE and the quantized plasmonic modes, which is crucial to demonstrate the emergence of single-photon nonlinearities. We investigate numerically the optical response and the resulting Rabi splitting in metallic nanoantennas and find the optimal geometries for the emergence of the strong-coupling regime with single QEs. Finally, we demonstrate the saturation of hybridized modes for a chosen configuration. Our results will be useful for implementation of realistic quantum plasmonic nanosystems involving single QEs at room temperature.

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“…[16][17][18][19][20][21][22][23][24][25][26][27][28][29] However, when the size of the particles or junctions is only a few nanometers or smaller, the quantum nature of electrons emerges, activating quantum tunneling effects across subnanometer interparticle gaps. 19,20,[30][31][32][32][33][34][35][36][37][38][39][40][41][42][43][44] Tunnelling effects are not considered in classical models, so that quantum corrected approaches need to be applied. 37,41 The theoretical study of the atomic-scale features in nanojunctions is still an almost unexplored field, because most phenomenological classical models do not address quantum effects.…”

Section: Introductionmentioning

confidence: 99%