Exciton–Plasmon Interactions in Quantum Dot–Gold Nanoparticle Structures

Cohen-Hoshen, Eyal; Bryant, Garnett W.; Pinkas, Iddo; Sperling, Joseph; Bar‐Joseph, I.

doi:10.1021/nl301917d

Cited by 138 publications

(134 citation statements)

References 24 publications

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“…On the theoretical side, classical and quantum calculations for a QE placed in the middle of the junction of a plasmonic dimer show that the hybrid structure undergoes dramatic changes in the absorption cross section as compared to individual components. [12][13][14][15]23 Thus, the electromagnetic coupling between the QE and the plasmonic nanoparticles has been tackled both theoretically and experimentally leading to the advanced understanding of the underlying phenomena. However, much less is known on the role of the direct electronic coupling between the QE and the plasmonic nanoparticle.…”

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confidence: 99%

Plexciton Quenching by Resonant Electron Transfer from Quantum Emitter to Metallic Nanoantenna

et al. 2013

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Coupling molecular excitons and localized surface plasmons in hybrid nanostructures leads to appealing, tunable optical properties. In this respect, the knowledge about the excitation dynamics of a quantum emitter close to a plasmonic nanoantenna is of importance from fundamental and practical points of view. We address here the effect of the excited electron tunneling from the emitter into a metallic nanoparticle(s) in the optical response. When close to a plasmonic nanoparticle, the excited state localized on a quantum emitter becomes short-lived because of the electronic coupling with metal conduction band states. We show that as a consequence, the characteristic features associated with the quantum emitter disappear from the optical absorption spectrum. Thus, for the hybrid nanostructure studied here and comprising quantum emitter in the narrow gap of a plasmonic dimer nanoantenna, the quantum tunneling might quench the plexcitonic states. Under certain conditions the optical response of the system approaches that of the individual plasmonic dimer. Excitation decay via resonant electron transfer can play an important role in many situations of interest such as in surface-enhanced spectroscopies, photovoltaics, catalysis, or quantum information, among others. KEYWORDS: Plexcitons, plasmon, exciton, quantum plasmonics, individual hybrid nanostructures B ringing together metallic nanostructures and quantum emitters, such as quantum dots and molecular complexes, offers unprecedented opportunities in controlling light on the nanoscale. Indeed, the tunability of the plasmonic response and of the near field enhancement in metal nanoparticle assemblies 1−5 allows to engineer the coupling between the excitonic resonance of a quantum emitter (QE) and the collective motion of the metallic electrons, i.e. the plasmons. During the past decade, the study of the interaction between light and these hybrid structures turned into an active field of research 6−25 owing to its fundamental interest and similarity with cavity quantum electrodynamics, 13,19 and due to the vast range of possible applications such as sensing, 26 single photon emitters for information technology, 27,28 and active devices.29−32 With increasing plasmon−exciton coupling strength, when the excitation energy of the emitter is tuned across the plasmon resonance, the Fano profiles in the scattering cross section evolve into the spectral features of avoided crossings 13,14,19,20 with well-resolved mixed states, so-called plexcitons. 21−23 As demonstrated in recent experiments, 23 the near-field enhancement in the junction between nanoparticles 3−5,33 might lead in this system to the strong plasmon−exciton coupling with large Rabi splitting of the issuing plexcitonic states. On the theoretical side, classical and quantum calculations for a QE placed in the middle of the junction of a plasmonic dimer show that the hybrid structure undergoes dramatic changes in the absorption cross section as compared to individual components. [12][13][14][15]23 Thus...

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Plexciton Quenching by Resonant Electron Transfer from Quantum Emitter to Metallic Nanoantenna

et al. 2013

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“…An example of this plasmon-enhanced emission was shown by positioning CdSe/ZnS QD in the nanogap of a 80 nm AuNP dimer that supports strong plasmon resonance, which was realized through surface-bound DNA hybridization between QD and AuNPs. 31 Single object measurement showed that the emission- Photonic nanoarchitectures X Lan and Q Wang enhancement factor approached the peaked maximum when the incident EM field was parallel to the dimer axis ( Figure 1b). This is associated with the strong EM field enhancement, which originates from the occurrence of longitudinal-bonding plasmon mode.…”

Section: Introductionmentioning

confidence: 98%

DNA-programmed self-assembly of photonic nanoarchitectures

Lan

Wang

2014

NPG Asia Mater

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Rational design and self-assembly of photonic nanoarchitectures with well-defined structures and geometries allows precisely manipulating light on the nanoscale, which has been the focus of nanophotonics in recent decades. DNA self-assembly is a powerful strategy in constructing desired photonic nanoarchitectures owing to the unique structural features of DNA, such as programmable sequence, predictable structure and precise molecule length (0.34 nm bp À1 ). The high addressability of DNA nanoscaffolds enables fine control over the locations of the photonic building blocks and thus the structure and geometry of the assembled photonic nanoarchitectures, which facilitates the quantitative study of the interactions among these photonic building blocks that are precisely organized on the DNA nanoscaffolds. This review summarizes the recent achievements in DNA-programmed self-assembly of photonic nanoarchitectures, where metallic nanocrystals and semiconductor quantum dots act as building blocks and are assembled into homo-and hetero-nanoarchitectures from one to two and three dimensions.

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“…We derive this parameter using a semi-classical approach, and show its dependence on the dielectric constants of the system and on the distance from the metallic layer. Recently there has been considerable interest on utilizing surface plasmons in metallic thin films to enhance internal quantum efficiency of luminescent materials [1][2][3][4][5][6][7][8][9][10][11][12] and light emitting diodes (LED). …”

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“…In this scenario, one needs to solve the following rate equations in order to calculate η: [3] d N p dt = N P pl − N P P bt [4] Using Eqs. 3-4, we have considered the following cases: Case III, where there are no phonon losses and Case IV, where phonon losses are present.…”

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Theory of Radiative Lifetime of an Activator Ion due to Surface Plasmons

Mishra

Collins

Piquette

2018

ECS J. Solid State Sci. Technol.

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We consider the lifetime of a phosphor layer situated near a metallic film. We first make general observations of the effect of the plasmons on the lifetime and quantum efficiency of the luminescent ions in the phosphor layer and on the role of the plasmons in the emission process. The effect of the plasmons in the excitation process and on the total luminescence from the system is also discussed. We then derive an expression for the lifetime of the optical ions interacting with the surface plasmon modes using the Einstein A and B coefficient formalism, which requires a determination of the mode density of the surface plasmons. Because the surface plasmons represent a 2-dimensional system, a length parameter must be introduced into the expression of the mode density. We derive this parameter using a semi-classical approach, and show its dependence on the dielectric constants of the system and on the distance from the metallic layer. Recently there has been considerable interest on utilizing surface plasmons in metallic thin films to enhance internal quantum efficiency of luminescent materials [1][2][3][4][5][6][7][8][9][10][11][12] and light emitting diodes (LED). 13-22The most important effect of the surface plasmons on luminescent ions is on their lifetime in the excited state which could contribute to improving the internal quantum efficiency of luminescent materials in the form of a slab or a layer. In this paper, we have studied how the change in the excited state lifetime of the radiating atoms could be described using the dispersion relations of the surface plasmons. The lifetime of an excited ion, τ as measured by the decay measurements consists of two components, radiative lifetime,τ R and nonradiative lifetime, τ N R the reciprocals of which are additive,The radiative lifetime of an ion depends on the transition moments of the ion, i.e., the matrix element of the electric dipole and quadrupole moments or magnetic moments between the excited and ground state wavefunctions of the radiating ions. Normally the radiative lifetime is a characteristic of the optical ion and does not change unless the wavefunctions of the optical ions are perturbed. On the other hand, nonradiative lifetime is associated with the relaxation of the excited state to phonons, lattice defects and impurities with a loss of the excited state energy. It is sometimes possible to increase the nonradiative lifetime by controlling the purity of the material, operating temperature, better material processing etc., thus decreasing the probability of nonradiative relaxation of the ion. From Eq. 1, it can be shown that when the nonradiative lifetime increases, the lifetime of the excited state increases. This increase in lifetime usually results in an increase of the internal quantum efficiency.If a new nonradiative pathway is opened, the nonradiative lifetime will decrease. It will not always decrease the internal quantum efficiency if the transferred energy is not completely lost as it is in the case of phonons. Such could be the case for s...

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Exciton–Plasmon Interactions in Quantum Dot–Gold Nanoparticle Structures

Cited by 138 publications

References 24 publications

Plexciton Quenching by Resonant Electron Transfer from Quantum Emitter to Metallic Nanoantenna

Plexciton Quenching by Resonant Electron Transfer from Quantum Emitter to Metallic Nanoantenna

DNA-programmed self-assembly of photonic nanoarchitectures

Theory of Radiative Lifetime of an Activator Ion due to Surface Plasmons

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