A highly efficient single-photon source based on a quantum dot in a photonic nanowire

Claudon, Julien; Bleuse, J.; Malik, Nitin S.; Bazin, M.; Jaffrennou, P.; Gregersen, Niels; Sauvan, Christophe; Lalanne, Philippe; Gérard, Jean‐Michel

doi:10.1038/nphoton.2009.287x

Cited by 732 publications

(664 citation statements)

References 29 publications

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“…[1][2][3][4][5][6][7][8][9] The integration of QDs in one-dimensional crystals (nanowires, NWs) has increasingly gained interest because of the improvement in the photon extraction efficiency and overall functionality. [10][11][12][13][14][15][16][17][18][19] Recently, it has been shown that self-segregation processes in ternary Al x Ga 1Àx As shells lead to the observation of luminescence stemming from 3D confined excitons. Several high-resolution imaging methods have demonstrated that the Al x Ga 1Àx As shells are indeed not homogeneous and contain nanoscale Ga-rich islands.…”

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confidence: 99%

Quantum dots in the GaAs/AlxGa1−xAs core-shell nanowires: Statistical occurrence as a function of the shell thickness

Francaviglia

Fontana

Conesa‐Boj

et al. 2015

Applied Physics Letters

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Quantum dots (QDs) embedded in nanowires represent one of the most promising technologies for applications in quantum photonics. Self-assembled bottom-up fabrication is attractive to overcome the technological challenges involved in a top-down approach, but it needs post-growth investigations in order to understand the self-organization process. We investigate the QD formation by selfsegregation in Al x Ga 1Àx As shells as a function of thickness and cross-section morphology. By analysing light emission from several hundreds of emitters, we find that there is a certain thickness threshold for the observation of the QDs. The threshold becomes smaller if a thin AlAs layer is pre-deposited between the GaAs nanowire core and the Al x Ga 1Àx As shell. Our results evidence the development of the quantum emitters during the shell growth and provide more guidance for their use in quantum photonics. V C 2015 AIP Publishing LLC. [http://dx

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confidence: 99%

Quantum dots in the GaAs/AlxGa1−xAs core-shell nanowires: Statistical occurrence as a function of the shell thickness

Francaviglia

Fontana

Conesa‐Boj

et al. 2015

Applied Physics Letters

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“…When embedded in a bulk semiconductor, however, QDs suffer from poor photon extraction efficiencies, since only a minor fraction of the photons can leave the high refractive index material. This problem can be mitigated by integrating QDs into optical microcavities [12,[16][17][18] or photonic waveguides [19][20][21], which can enhance extraction efficiencies to values beyond 50%.…”

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confidence: 99%

Two-photon interference from a quantum dot microcavity: Persistent pure dephasing and suppression of time jitter

et al. 2015

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We demonstrate the emission of highly indistinguishable photons from a quasi-resonantly pumped coupled quantum dot-microcavity system operating in the regime of cavity quantum electrodynamics. Changing the sample temperature allows us to vary the quantum dot-cavity detuning, and on spectral resonance we observe a three-fold improvement in the Hong-Ou-Mandel interference visibility, reaching values in excess of 80%. Our measurements off-resonance allow us to investigate varying Purcell enhancements, and to probe the dephasing environment at different temperatures and energy scales. By comparison with our microscopic model, we are able to identify pure-dephasing and not time-jitter as the dominating source of imperfections in our system.

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“…Approaches to improve the efficiency of light collection involve photonic design of the shape of the nanowire, including tapering. 2 A further improvement in the QD-in-NW design involved the deposition of a SiO 2 layer conformably onto the tapered nanowire. 16 The top-taper allowed low-loss out-coupling to free space, while the SiO 2 thickness allowed further tuning of energy emission of the QD by the application of a homogeneous static strain.…”

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Nanoskiving Core–Shell Nanowires: A New Fabrication Method for Nano-optics

et al. 2014

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This paper describes the fabrication of functional optical devices by sectioning quantum-dot-in-nanowires systems with predefined lengths and orientations. This fabrication process requires only two steps, embedding the nanowires in epoxy and using an ultramicrotome to section them across their axis ("nanoskiving"). This work demonstrates the combination of the following four capabilities: (i) the control of the length of the nanowire sections at the nanometer scale; (ii) the ability to process the nanowires after cutting using wet etching; (iii) the possibility of modifying the geometry of the wire by varying the sectioning angle; and (iv) the generation of as many as 120 consecutive slabs bearing nanowires that have uniform size and approximately reproducible lateral patterns and that can subsequently be transferred to different substrates. The quantum dots inside the nanowires are functional and of a high optical quality after the sectioning process and exhibit photoluminescent emission with wavelengths in the range of 650−710 nm.

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A highly efficient single-photon source based on a quantum dot in a photonic nanowire

Cited by 732 publications

References 29 publications

Quantum dots in the GaAs/AlxGa1−xAs core-shell nanowires: Statistical occurrence as a function of the shell thickness

Quantum dots in the GaAs/AlxGa1−xAs core-shell nanowires: Statistical occurrence as a function of the shell thickness

Two-photon interference from a quantum dot microcavity: Persistent pure dephasing and suppression of time jitter

Nanoskiving Core–Shell Nanowires: A New Fabrication Method for Nano-optics

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