Recent advances on single photon sources based on single colloidal nanocrystals

Vittorio, Massimo De; Pisanello, Ferruccio; Martiradonna, Luigi; Qualtieri, Antonio; Stomeo, T.; Bramati, Alberto; Cingolani, R.

doi:10.2478/s11772-009-0026-7

Cited by 32 publications

(17 citation statements)

References 84 publications

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“…Among them are electrooptical devices based on the electroabsorption phenomenon 8 , 9 and photonic applications in different fields such as health, energy, environment and aerospace (ref. 10 and references therein). Contrary to epitaxial based QDs which exhibits single photon emission only at cryogenic temperatures 11 , 12 , single colloidal QDs based on group II-VI compound exhibit photon antibunching at room temperature and even above 12 – 14 .…”

Section: Introductionmentioning

confidence: 99%

Morphology control of exciton fine structure in polar and nonpolar zinc sulfide nanorods

Baskoutas

Zeng

Garoufalis

et al. 2017

Sci Rep

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Electron-hole exchange interaction in semiconductor quantum dots (QDs) splits the band-edge exciton manifold into optically active (“bright”) and passive (“dark”) states, leading to a complicated exciton fine structure. In the present work, we resolve by atomistic million-atom many-body pseudopotential calculations the exciton fine structure in colloidal polar and nonpolar zinc sulfide (ZnS) nanorods (NRs). We explore that polar NRs with high symmetry exhibit vanishing fine structure splitting (FSS), and are therefore ideal sources of entangled photon pairs. In contrast, nonpolar NRs grown along and directions with reduced symmetries have significant FSS, which can even reach up to a few mili electron volts. However, such large FSS can be effectively minimized to a few micro electron volts, or even less, by a simple morphology control.

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Section: Introductionmentioning

confidence: 99%

Morphology control of exciton fine structure in polar and nonpolar zinc sulfide nanorods

Baskoutas

Zeng

Garoufalis

et al. 2017

Sci Rep

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“…These emitters combine a tuneable emission wavelength at room temperature, high radiative quantum efficiency, excellent photostability and ease of integration with other materials 1 . For example, colloidal QDs have been demonstrated as stable, room temperature single-photon sources 2 3 , but the slow radiative rate associated with these systems limits the attainable repetition rate. Likewise, light-emitting diodes (LEDs) are often not used in telecommunications, in part, due to the long spontaneous emission lifetimes.…”

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confidence: 99%

Ultrafast spontaneous emission source using plasmonic nanoantennas

et al. 2015

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Typical emitters such as molecules, quantum dots and semiconductor quantum wells have slow spontaneous emission with lifetimes of 1–10 ns, creating a mismatch with high-speed nanoscale optoelectronic devices such as light-emitting diodes, single-photon sources and lasers. Here we experimentally demonstrate an ultrafast (<11 ps) yet efficient source of spontaneous emission, corresponding to an emission rate exceeding 90 GHz, using a hybrid structure of single plasmonic nanopatch antennas coupled to colloidal quantum dots. The antennas consist of silver nanocubes coupled to a gold film separated by a thin polymer spacer layer and colloidal core–shell quantum dots, a stable and technologically relevant emitter. We show an increase in the spontaneous emission rate of a factor of 880 and simultaneously a 2,300-fold enhancement in the total fluorescence intensity, which indicates a high radiative quantum efficiency of ∼50%. The nanopatch antenna geometry can be tuned from the visible to the near infrared, providing a promising approach for nanophotonics based on ultrafast spontaneous emission.

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“…Because of that, shell energy landscape strongly influences the electrons wavefunction ( Ψ e ) while preserving holes confinement. Colloidal CdSe/CdS DRs have already been demonstrated to show remarkable single‐photon polarization properties,38, 39 high room‐temperature PL quantum efficiency15, 40 and interesting compatibility with planar nanofabrication technologies 41–45. The DRs investigated in this work have been produced by a wet‐chemical seeded‐growth approach,15 a synthetic procedure that allows a precise control of the heterostructure geometrical parameters 16, 46.…”

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confidence: 99%