Cavity QED treatment of interactions between a metal nanoparticle and a dipole emitter

Waks, Edo; Sridharan, Deepak

doi:10.1103/physreva.82.043845

Cited by 265 publications

(262 citation statements)

References 35 publications

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“…11,29,30 When the nanohybrid is strongly driven by a light field, the quantum coherent coupling between the light and the emitter becomes important and the dynamics of the nanohybrid can be dramatically different. [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45] Descriptions of strongly driven nanohybrids with the emitter treated quantum mechanically and the MNP response treated classically predict a nonlinear Fano effect, bistability, and induced transparency. [31][32][33][34][35][36][37][38] A variety of applications have been proposed that exploit these effects, [46][47][48] suggesting new building blocks for metamaterials with properties very different from those of the constituents of the nanohybrid.…”

Section: Introductionmentioning

confidence: 99%

Approaching the quantum limit for nanoplasmonics

2015

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The character of optical excitations in nanoscale and atomic-scale materials is often strongly mixed, having contributions from both single-particle transitions and collective, plasmon-like response. This complicates the quantum description of these excitations, because there is no clear way to define their quantization. To move toward a quantum theory for these optical excitations, they must first be characterized so that single-particle-like and collective, plasmon-like excitations can be identified. We show that time-dependent density functional theory can be used to make that characterization if both the charge densities induced by the excitation and the transitions that make up the excitation are analyzed. Density functional theory predicts that single-particle-like and collective excitations can coexist. Exact calculations for small nanosystems predict that single-particle excitations evolve into collective excitations as the electron-electron interaction is turned on with no indication that they coexist. These different predictions present a challenge that must be resolved to develop an understanding for quantum excitations in nanoplasmonic materials.

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Section: Introductionmentioning

confidence: 99%

Approaching the quantum limit for nanoplasmonics

2015

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“…It renders J(ω PS ) versus R 2 /R 1 for both normalizations, and proves that the cavity performance is rather independent of the particle sizes in the regime R 1,2 δ. To gain physical insight into the dependence of J(ω) on the QE position, we assume that δ R 1,2 , and work within the high quality resonator limit [6]. This way, we can obtain analytical expressions for J(ω), which can be written as a sum of Lorentzian SP contributions of the form…”

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confidence: 99%

“…A quantum electrodynamics description of plasmonic strong coupling of a single QE has been developed for a flat metal surface [4], and isolated [5,6] and distant nanoparticles [7][8][9], where SP hybridization is not fully exploited. From the experimental side, in recent years, PEPs have been reported in emitter ensembles [10][11][12][13], in which excitonic nonlinearities are negligible [14][15][16].…”

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confidence: 99%

Transformation Optics Approach to Plasmon-Exciton Strong Coupling in Nanocavities

et al. 2016

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We investigate the conditions yielding plasmon-exciton strong coupling at the single emitter level in the gap between two metal nanoparticles. A quasi-analytical transformation optics approach is developed that makes possible a thorough exploration of this hybrid system incorporating the full richness of its plasmonic spectrum. This allows us to reveal that by placing the emitter away from the cavity center, its coupling to multipolar dark modes of both even and odd parity increases remarkably. This way, reversible dynamics in the population of the quantum emitter takes place in feasible implementations of this archetypal nanocavity.PACS numbers: 73.20. Mf, 42.50.Nn, 71.36.+c Plasmon-exciton-polaritons (PEPs) are hybrid lightmatter states that emerge from the electromagnetic (EM) interaction between surface plasmons (SPs) and nearby quantum emitters (QEs) [1,2]. Crucially, PEPs only exist when these two subsystems are strongly coupled, i.e., they exchange EM energy coherently in a time scale much shorter than their characteristic lifetimes. Recently, much attention has focused on PEPs, since they combine the exceptional light concentration ability of SPs with the extreme optical nonlinearity of QEs. These two attributes makes them promising platforms for the next generation of quantum nanophotonic components [3].A quantum electrodynamics description of plasmonic strong coupling of a single QE has been developed for a flat metal surface [4], and isolated [5,6] and distant nanoparticles [7][8][9], where SP hybridization is not fully exploited. From the experimental side, in recent years, PEPs have been reported in emitter ensembles [10][11][12][13], in which excitonic nonlinearities are negligible [14][15][16]. Only very recently, thanks to advances in the fabrication and characterization of large Purcell enhancement nanocavities [17][18][19], far-field signatures of plasmonexciton strong coupling for single molecules have been reported experimentally [20].In this Letter, we theoretically investigate the plasmonic coupling of a single emitter in a paradigmatic cavity: the nanometric gap between two metallic particles [13,19,20]. We consider spherical-shaped nanoparticles, and develop a transformation optics (TO) [21,22] approach that fully accounts for the rich EM spectrum that originates from SP hybridization across the gap. Our method, which is the first application of TO concepts to treat quantum optical phenomena, yields quasianalytical insight into the Wigner-Weisskopf problem [23] for these systems, and enables us to reveal the prescriptions that nanocavities must fulfil to support single QE PEPs. (1) level system (with transition frequency ω E and z-oriented arXiv:1605.09443v2 [cond-mat.mes-hall]

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“…attached to a plasmonic gold nanoparticle (AuNP)-path interference effects similar to Fano resonances are observed [11][12][13][14]. The two absorption paths for the classical oscillator, induced by the hybridization with the quantum oscillator, can interfere destructively yielding a cancellation of the polarization on the plasmonic response for some frequencies [15,16].…”

Section: Introductionmentioning

confidence: 97%

Fluorescence excitation by enhanced plasmon upconversion under continuous wave illumination

Tașgın

Salakhutdinov

Kendziora

et al. 2016

Photonics and Nanostructures - Fundamentals and Applications

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We demonstrate effective background-free continuous wave nonlinear optical excitation of molecules that are sandwiched between asymmetrically constructed plasmonic gold nanoparticle clusters. We observe that near infrared photons are converted to visible photons through efficient plasmonic second harmonic generation. Our theoretical model and simulations demonstrate that Fano resonances may be responsible for being able to observe nonlinear conversion using a continuous wave light source. We show that nonlinearity enhancement of plasmonic nanostructures via coupled quantum mechanical oscillators such as molecules can be several orders larger as compared to their classical counterparts.

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Cavity QED treatment of interactions between a metal nanoparticle and a dipole emitter

Cited by 265 publications

References 35 publications

Approaching the quantum limit for nanoplasmonics

Approaching the quantum limit for nanoplasmonics

Transformation Optics Approach to Plasmon-Exciton Strong Coupling in Nanocavities

Fluorescence excitation by enhanced plasmon upconversion under continuous wave illumination

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