Semiconductor microcavities, quantum boxes and the Purcell effect

Gérard, Jean‐Michel; Gayral, B.

doi:10.1007/bfb0104387

Cited by 6 publications

(6 citation statements)

References 46 publications

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“…Finally, we discuss the Purcell factor, which describes the enhancement of donor radiative decay rate due to the increased LDOS. 69,70 The Purcell factor depends on the quality factor and mode volume. 38 The plasmonic grating used in this study has a large mode volume and tends to exhibit small Purcell factor.…”

Section: Discussionmentioning

confidence: 99%

Plasmon Enhancement Mechanism for the Upconversion Processes in NaYF₄:Yb³⁺,Er³⁺ Nanoparticles: Maxwell versus Förster

Cho²,

Ahn³

et al. 2014

ACS Nano

193

240

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Rare-earth activated upconversion materials are receiving renewed attention for their potential applications in bioimaging and solar energy conversion. To enhance the upconversion efficiency, surface plasmon has been employed but the reported enhancements vary widely and the exact enhancement mechanisms are not clearly understood. In this study, we synthesized upconversion nanoparticles (UCNPs) coated with amphiphilic polymer which makes UCNPs water soluble and negatively charged. We then designed and fabricated a silver nanograting on which three monolayers of UCNPs were deposited by polyelectrolyte-mediated layer-by-layer deposition technique. The final structures exhibited surface plasmon resonance at the absorption wavelength of UCNP. The green and red photoluminescence intensity of UCNPs on nanograting was up to 16 and 39 times higher than the reference sample deposited on flat silver film, respectively. A thorough analysis of rate equations showed that the enhancement was due entirely to absorption enhancement in the strong excitation regime, while the enhancement of both absorption and Förster energy transfer contribute in the weak excitation regime. The Purcell factor was found to be small and unimportant because the fast nonradiative decay dominates the relaxation process. From the experimentally observed enhancements, we concluded 3.1× and 1.7× enhancements for absorption and Förster energy transfer, respectively. This study clearly shows the plasmon enhancement mechanism and its excitation power dependence. It provides the basis for comparison of the enhancements of various plasmonic UCNP systems in the literature. It also lays the foundation for rational design of optical plasmonic structures for upconversion enhancement.

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Section: Discussionmentioning

confidence: 99%

Plasmon Enhancement Mechanism for the Upconversion Processes in NaYF₄:Yb³⁺,Er³⁺ Nanoparticles: Maxwell versus Förster

Cho²,

Ahn³

et al. 2014

ACS Nano

193

240

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“…The Hamiltonian ͑1͒ is a simple model of a threedimensional cavity ͑photonic dot͒, 20,21 containing localized, physically separated electronic excitations. Although simplified, it is a useful starting point for many systems.…”

Section: Modelmentioning

confidence: 99%

Bose condensation of cavity polaritons beyond the linear regime: The thermal equilibrium of a model microcavity

Eastham¹,

Littlewood²

2001

Phys. Rev. B

152

199

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We consider a generalization of the Dicke model. This model describes localized, physically separated, saturable excitations, such as excitons bound on impurities, coupled to a single long-lived mode of an optical cavity. We consider the thermal equilibrium of this model at a fixed total number of excitons and photons. We find a phase in which both the cavity field and the excitonic polarization are coherent. This phase corresponds to a Bose condensate of cavity polaritons, generalized to allow for the fermionic internal structure of the excitons. It is separated from the normal state by an unusual reentrant phase boundary. We calculate the excitation energies of the model, and hence the optical absorption spectra of the cavity. In the condensed phase the absorption spectrum is gapped. The presence of this gap distinguishes the polariton condensate from the normal state and from a conventional laser, even when the inhomogeneous linewidth of the excitons is so large that there is no observable polariton splitting in the normal state.

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“…A comparison between the two systems should therefore elucidate the respective roles of quantum confinement and superlattice band formation in determining the optical properties. Free-standing GaAs films can be produced by chemical etching 7 ; GaAs/vacuum superlattices can also be a model for multilayers formed by GaAs and a wide-gap oxide, like Al 2 O 3 or oxidized AlAs (AlOx).…”

Section: Introductionmentioning

confidence: 99%

Electronic states and optical properties of GaAs/AlAs and GaAs/vacuum superlattices by the linear combination of bulk bands method

Botti

Andreani²

2001

Phys. Rev. B

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The linear combination of bulk bands method recently introduced by Wang, Franceschetti and Zunger [Phys. Rev. Lett. 78, 2819 (1997)] is applied to a calculation of energy bands and optical constants of (GaAs)n/(AlAs)n and (GaAs)n/(vacuum)n (001) superlattices with n ranging from 4 to 20. Empirical pseudopotentials are used for the calculation of the bulk energy bands. Quantumconfined induced shifts of critical point energies are calculated and are found to be larger for the GaAs/vacuum system. The E1 peak in the absorption spectra has a blue shift and splits into two peaks for decreasing superlattice period; the E2 transition instead is found to be split for large-period GaAs/AlAs superlattices. The band contribution to linear birefringence of GaAs/AlAs superlattices is calculated and compared with recent experimental results of Sirenko et al. [Phys. Rev. B 60, 8253 (1999)]. The frequency-dependent part reproduces the observed increase with decreasing superlattice period, while the calculated zero-frequency birefringence does not account for the experimental results and points to the importance of local-field effects.

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Semiconductor microcavities, quantum boxes and the Purcell effect

Cited by 6 publications

References 46 publications

Plasmon Enhancement Mechanism for the Upconversion Processes in NaYF₄:Yb³⁺,Er³⁺ Nanoparticles: Maxwell versus Förster

Plasmon Enhancement Mechanism for the Upconversion Processes in NaYF₄:Yb³⁺,Er³⁺ Nanoparticles: Maxwell versus Förster

Bose condensation of cavity polaritons beyond the linear regime: The thermal equilibrium of a model microcavity

Electronic states and optical properties of GaAs/AlAs and GaAs/vacuum superlattices by the linear combination of bulk bands method

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Semiconductor microcavities, quantum boxes and the Purcell effect

Cited by 6 publications

References 46 publications

Plasmon Enhancement Mechanism for the Upconversion Processes in NaYF4:Yb3+,Er3+ Nanoparticles: Maxwell versus Förster

Plasmon Enhancement Mechanism for the Upconversion Processes in NaYF4:Yb3+,Er3+ Nanoparticles: Maxwell versus Förster

Bose condensation of cavity polaritons beyond the linear regime: The thermal equilibrium of a model microcavity

Electronic states and optical properties of GaAs/AlAs and GaAs/vacuum superlattices by the linear combination of bulk bands method

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Product

Resources

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Plasmon Enhancement Mechanism for the Upconversion Processes in NaYF₄:Yb³⁺,Er³⁺ Nanoparticles: Maxwell versus Förster

Plasmon Enhancement Mechanism for the Upconversion Processes in NaYF₄:Yb³⁺,Er³⁺ Nanoparticles: Maxwell versus Förster