Photon antibunching in single CdSe/ZnS quantum dot fluorescence

Lounis, Brahim; Bechtel, Hans A.; Gerion, Daniele; Alivisatos, Paul; Moerner, W. E.

doi:10.1016/s0009-2614(00)01042-3

Cited by 317 publications

(352 citation statements)

References 19 publications

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“…with the exciton lifetime τ x and the effective pump rate W [16,17]. Convoluting 1 with the temporal impulse response function of the TCSPS apparatus, involving the instrument time constant τ i , the measured second order autocorrelation function g (2) m (τ ) can be calculated given the three parameters ρ, τ x and τ i by,…”

Section: Resultsmentioning

confidence: 99%

Polarized single photon emission and photon bunching from an InGaN quantum dot on a GaN micropyramid

Jemsson

Machhadani²,

Holtz³

et al. 2015

Nanotechnology

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We report on excitonic single photon emission and biexcitonic photon bunching from an InGaN quantum dot formed on the apex of a hexagonal GaN micropyramid. An approach to suppress uncorrelated emission from the pyramid base is proposed, a metal film is demonstrated to effectively screen background emission and thereby significantly enhance the signal-to-background ratio of the quantum dot emission. As a result, the second order coherence function at zero time delay g (2) (0) is significantly reduced (to g (2) (0) = 0.24, raw value) for the excitonic autocorrelation at a temperature of 12 K under continuous wave excitation, and a dominating single photon emission is demonstrated to survive up to 50 K. The deterioration of the g (2) (0)-value at elevated temperatures is well understood as the combined effect of reduced signal-to-background ratio and limited time resolution of the setup. This result underlines the great potential of site controlled pyramidal dots as sources of fast polarized single photons.

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Section: Resultsmentioning

confidence: 99%

Polarized single photon emission and photon bunching from an InGaN quantum dot on a GaN micropyramid

Jemsson

Machhadani²,

Holtz³

et al. 2015

Nanotechnology

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“…For a two level quantum emitter, the central peak is missing due to photon antibunching 50 . This has been the usual hallmark for the identification of single photon emitters, such as strongly confined quantum dots with efficient Auger recombination 51,52 . However, a quantum dot is only a good representation of a two-level quantum system in the limit of low biexciton efficiency 51 .…”

Section: An Efficient Biexcitonmentioning

confidence: 99%

Cryogenic Single-Nanocrystal Spectroscopy: Reading the Spectral Fingerprint of Individual CdSe Quantum Dots

Fernée

Tamarat

Lounis

2013

J. Phys. Chem. Lett.

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Spectroscopically resolved emission from single nanocrystals at cryogenic temperatures provides unique insight into physical processes that occur within these materials. At low temperatures, the emission spectra collapse to narrow lines, revealing a rich spectroscopic landscape and unexpected properties, completely hidden at the ensemble level. Since these techniques were first used, the technology of nanocrystal synthesis has matured significantly, and new materials with outstanding photostability have been reported. In this perspective, we show how cryogenic spectroscopy of single nanocrystals probes the fundamental excitonic structure of the band edge, revealing spectral fingerprints that are highly sensitive to a range of photophysical properties as well as nanocrystal morphology. In particular, spectral and temporal signatures of biexciton and trion emission are revealed, and their relevance to emerging technologies is discussed. Overall we show how cryogenic single nanocrystal spectroscopy can be used as a tool for understanding fundamental photophysics and guiding the synthesis of new nanocrystal materials.

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“…Wet-chemically synthesized colloidal core/shell nanocrystals (NCs) have been shown to emit nonclassical light at room temperature [1][2][3][4] making them suitable for applications in the field of quantum optics. Among colloidal NCs, CdSe/CdS dot-in-rods (DRs) made up by a spherical core of CdSe surrounded by a rod-like shell of CdS 5 have interesting features as single photon emitters such as a high degree of linear polarization [6][7][8][9][10] and a strongly reduced emission intermittency (non-blinking emission) when synthesized with thick CdS shells 11 .…”

Section: Introductionmentioning

confidence: 99%

“…Several works have been devoted to the study of photon statistics as a method to assess the efficiency of the Auger processes and their consequence on multiexciton recombinations and blinking 12,13 . Nair et al 20 have demonstrated that one can deduce the biexciton quantum yield from the intensity autocorrelation function at zero delay, g (2) (0), for NCs pumped at low fluences.…”

Section: Introductionmentioning

confidence: 99%

Effect of charging on CdSe/CdS dot-in-rods single-photon emission

et al. 2014

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The photon statistics of CdSe/CdS dot-in-rods nanocrystals is studied with a method involving post-selection of the photon detection events based on the photoluminescence count rate. We show that flickering between two states needs to be taken into account to interpret the single-photon emission properties. With post-selection we are able to identify two emitting states: the exciton and the charged exciton (trion), characterized by different lifetimes and different second order correlation functions. Measurements of the second order autocorrelation function at zero delay with postselection shows a degradation of the single photon emission for CdSe/CdS dot-in-rods in a charged state that we explain by deriving the neutral and charged biexciton quantum yields.

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Photon antibunching in single CdSe/ZnS quantum dot fluorescence

Cited by 317 publications

References 19 publications

Polarized single photon emission and photon bunching from an InGaN quantum dot on a GaN micropyramid

Polarized single photon emission and photon bunching from an InGaN quantum dot on a GaN micropyramid

Cryogenic Single-Nanocrystal Spectroscopy: Reading the Spectral Fingerprint of Individual CdSe Quantum Dots

Effect of charging on CdSe/CdS dot-in-rods single-photon emission

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