Exciton–polaritons in organic microcavities

Litinskaya, Marina; Reineker, P.; Agranovich, V.M.

doi:10.1016/j.jlumin.2006.01.016

Cited by 45 publications

(67 citation statements)

References 18 publications

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“…We provide direct evidence that upper-branch cavity-polaritons undergo an ultra-fast scattering process that populates incoherent states in the exciton reservoir with a rate of (150 fs) -1 a result in good agreement with theoretical predictions [3][4][5]. We also find that reservoir excitons scatter into lowerbranch polaritons with a time constant of around 3.2 ps.…”

Section: Resultssupporting

confidence: 80%

Ultra-fast polariton dynamics in an organic microcavity

Virgili

Coles

Adawi

et al. 2013

EPJ Web of Conferences

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Abstract:We study an organic semiconductor microcavity operating in the strongcoupling regime using femtosecond pump-probe spectroscopy. By probing the photoinduced absorption bands, we characterize the time-dependent population densities of states in the two polariton branches. We found evidence of a scattering process from the upper-branch cavity polaritons to the exciton reservoir having a rate of (150 fs)−1. A slower process similarly populates lower-branch polaritons with a rate of around (3ps)−1

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Section: Resultssupporting

confidence: 80%

Ultra-fast polariton dynamics in an organic microcavity

Virgili

Coles

Adawi

et al. 2013

EPJ Web of Conferences

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“…15 Moreover, above threshold, when the polariton density becomes important, the details of the theoretical model used for the polariton-polariton bimolecular quenching become important. [23][24][25] Note that the mean-field polariton-polariton interaction 26 has not been included as no blue-shift has been resolved in the experiments, which feature a relatively broad linewidth. In conclusion, using our simple two-level model, we have extracted an estimate for the scattering process W e→p relevant to polariton lasing in anthracene.…”

Section: Resultsmentioning

confidence: 99%

Microscopic theory of polariton lasing via vibronically assisted scattering

et al. 2013

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Polariton lasing has recently been observed in strongly coupled crystalline anthracene microcavities. A simple model is developed describing the onset of the nonlinear threshold based on a master equation including the relevant relaxation processes and employing realistic material parameters. The mechanism governing the buildup of the polariton population, namely, bosonic stimulated scattering from the exciton reservoir via a vibronically assisted process, is characterized and its efficiency calculated on the basis of a microscopic theory. The role of polariton-polariton bimolecular quenching is identified and temperature-dependent effects are discussed.

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“…Therefore the excitation spectrum is composed, besides polaritons, of a number of uncoupled molecular excitons that form an excitonic reservoir (ER) 12,15,16 as shown in Fig.1. The excitonic part of the polaritons are formed by a Bloch sum, with q < q max , made from the superradiant molecular excitons of the J-aggregates, while the ER is composed by uncoupled superradiant excitons from the remaining part of the Brillouin zone, plus a number of higher energy "dark" excitons.…”

Section: The Modelmentioning

confidence: 99%

“…10,11 The nature of polaritons in disordered organic MCs has been addressed from the theoretical point of view 12,13,14,15 , showing the coexistence of delocalized and partially localized polaritons. The possible interaction with molecular vibrations was discussed 16,17 , the effect of anisotropy in organic crystal was characterized 18 , as well as the possible occurrence of non-linear phenomena 19 for high density of polaritons.…”

Section: Introductionmentioning

confidence: 99%

Exciton-phonon scattering and photoexcitation dynamics inJ-aggregate microcavities

Michetti

Rocca

2009

Phys. Rev. B

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We have developed a model accounting for the photo-excitation dynamics and the photoluminescence of strongly coupled J-aggregate microcavities. Our model is based on a description of the J-aggregate film as a disordered Frenkel exciton system in which relaxation occurs due to the presence of a thermal bath of molecular vibrations. In a strongly coupled microcavity exciton-polaritons are formed, mixing superradiant excitons and cavity photons. The calculation of the microcavity steady-state photoluminescence, following a CW non resonant pumping, is carried out. The experimental photoluminescence intensity ratio between upper and lower polariton branches is accurately reproduced. In particular both thermal activation of the photoluminescence intensity ratio and its Rabi splitting dependence are a consequence of the bottleneck in the relaxation, occurring at the bottom of the excitonic reservoir. The effects due to radiative channels of decay of excitons and to the presence of a paritticular set of discrete optical molecular vibrations active in relaxation processes are investigared.

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Exciton–polaritons in organic microcavities

Cited by 45 publications

References 18 publications

Ultra-fast polariton dynamics in an organic microcavity

Ultra-fast polariton dynamics in an organic microcavity

Microscopic theory of polariton lasing via vibronically assisted scattering

Exciton-phonon scattering and photoexcitation dynamics inJ-aggregate microcavities

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