Fluorescence quenching near small metal nanoparticles

Pustovit, Vitaliy N.; Shahbazyan, Tigran V.

doi:10.1063/1.4721388

Cited by 62 publications

(58 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In all calculations, we used experimental Au dielectric function [65] and included modes with angular momenta up to l max = 50. Note that we excluded the region of very small distances dominated by quantum effects, which are beyond the scope of this paper [66].…”

Section: Numerical Resultsmentioning

confidence: 99%

Spaser quenching by off-resonant plasmon modes

Petrosyan

Shahbazyan

2017

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

We study the effect of off-resonant plasmon modes on spaser threshold in nanoparticle-based spasers. We develop an analytical semiclassical model and derive spaser threshold condition accounting for gain coupling to higher-order plasmons. We show that such a coupling originates from inhomogeneity of gain distribution near the metal surface and leads to an upward shift of spaser frequency and population inversion threshold. This effect is similar, albeit significantly weaker, to quenching of plasmon-enhanced fluorescence near metal nanostructures due to excitation of offresonant modes with wide spectral band. We also show that spaser quenching is suppressed for high gain concentrations and establish a simple criterion for quenching onset, which we support by numerical calculations for spherical geometry.

show abstract

Section: Numerical Resultsmentioning

confidence: 99%

Spaser quenching by off-resonant plasmon modes

Petrosyan

Shahbazyan

2017

Phys. Rev. B

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is also worth noting that despite the radiative shift being rather small, it enters the analytical formula for the correlation functions for the photon-number statistics we calculate in the following sections as a dimensionless frequency shift, so its contribution to the nonclassical properties of light from resonance fluorescence will be essential. Also important to mention is that, despite all formulas in this section for the decay rate and the radiative frequency shift of a two-level atom in close proximity to a metal nanosphere being derived in a very simple quasistatic, quasiclassical model, they fit well at a distance between the emitter and the surface of the nanoparticle not less than a few (2-5) nm, the results of a more detailed theoretical and numerical treatment within classical electrodynamics [35,36] and, recently, of fully quantum consideration [37][38][39]. The latter allows for a correct description of the strong coupling between the quantum emitter and a metal nanoparticle at very small distances to the nanoparticle's surface as well as accounting for the self-coupling of the quantum emitter through the metal nanoparticle [39].…”

Section: The Atom's Radiative and Nonradiative Decay Rates And Trmentioning

confidence: 79%

Photon-number statistics from resonance fluorescence of a two-level atom near a plasmonic nanoparticle

Pastukhov

Vladimirova²,

Zadkov³

2014

Phys. Rev. A

View full text Add to dashboard Cite

The photon-number statistics from resonance fluorescence of a two-level atom near a metal nanosphere driven by a laser field with finite bandwidth is studied theoretically. Our analysis shows that all interesting physics here takes place in a small area around the nanosphere where the near field and the atom-nanosphere coupling essentially affect the radiative properties of the atom. Computer modeling estimates this area roughly as r 2a (r is the distance from the center of the nanosphere to the atom), with a being the radius of the nanosphere. At the larger distances, the influence of the nanoparticle vanishes and the atom tends to behave similarly to that in free space. It is shown that the distribution function p(n,T ) of the emission probability of n photons in a given time interval T in steady-state resonance fluorescence drastically depends on the atom location around the nanosphere for r 2a, featuring a characteristic twist in the ridgelike dependence and a convergence time of up to 9 μs, two orders of magnitude slower than for the atom in free space. At large distances, the distribution converges to a Gaussian one, as for the atom in free space. The typical convergence time scale at large distances r > 2a tends to the convergence time of the atom in free space. There are also two areas symmetrical around the nanosphere in which ∼ γ and the convergence time goes to zero. This behavior is determined by the interplay of the radiative and nonradiative decay rates of the atom due to the coupling with the metal nanosphere and by the near-field intensity. Additional parameters are the normalized laser frequency detuning from the atomic resonance and the bandwidth of the incoming laser field.

show abstract

“…Such quenching occurs even for radiating dipoles near bulk metal surfaces as described by Chance et al [22] and more recently for dipoles near metal nanospheres [23]. Placing luminescent NCs (or fluorescent molecules) near plasmonic NPs (with resonances close to the absorption and/or emission frequencies of the NCs) offers additional channels for luminescence quenching (and luminescence enhancement) over and above what occurs with bulk metal surfaces, prompting Geddes et al to brand such processes metal-enhanced fluorescence [24].…”

Section: Introductionmentioning

confidence: 94%

Luminescence Enhancement Mechanism of Lanthanide-Doped Hybrid Nanostructures Decorated by Silver Nanocrystals

Moskovits

Dong

et al. 2014

Plasmonics

View full text Add to dashboard Cite

Hybrid nanostructures composed of rare earth iondoped lanthanum trifluoride nanocrystals deposited on silica nanospheres (LaF 3 :Yb 3+ , Er 3+ @SiO 2 ) and decorated with varying quantities of silver nanoparticles (Ag NPs) were synthesized using a simple strategy. Down and upconversion luminescence spectra were recorded. The luminescence dynamics were also recorded following excitation with a 532-nm pulse. Silver loading was found to have a significant effect both on the luminescence intensity and the luminescence decay rate, with the samples with the lowest silver content showing reduced luminescence intensity over silver-free samples, while the samples with large levels of silver loading showed significant luminescence enhancement. The results were successfully (and quantitatively) interpreted in terms of the competition between surface plasmon-induced field enhancement mediated by the Ag nanoparticles and nonradiative energy transfer from the luminescent ions to Ag nanoparticles. By combining the measured luminescence intensity with the luminescence decay rate determined from the dynamics measurements, and with the measured surface plasmon absorption spectra, one could obtain a quantitative and self-consistent understanding of the observed dependence of the green 4 S 3/2 → 4 I 15/2 (~540 nm) and red 4 F 9/2 → 4 I 15/2 (~650) emission bands on the Ag NP metal loading.

show abstract

Fluorescence quenching near small metal nanoparticles

Cited by 62 publications

References 64 publications

Spaser quenching by off-resonant plasmon modes

Spaser quenching by off-resonant plasmon modes

Photon-number statistics from resonance fluorescence of a two-level atom near a plasmonic nanoparticle

Luminescence Enhancement Mechanism of Lanthanide-Doped Hybrid Nanostructures Decorated by Silver Nanocrystals

Contact Info

Product

Resources

About