Cascaded emission of linearly polarized single photons from positioned InP/GaInP quantum dots

Journal Article · Mon Nov 04 04:00:00 EST 2013 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4828354· OSTI ID:22254113

Braun, T.; Unsleber, S.; Baumann, V.; Schneider, C.; Höfling, S.; Kamp, M. ^[1]; Gschrey, M.; Rodt, S.; Reitzenstein, S. ^[2]

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1. Technische Physik, Physikalisches Institut and Wilhelm Conrad Röntgen-Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, D-97074 Würzburg (Germany)
2. Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstrasse 36, 10623 Berlin (Germany)

We report on the optical characterization of site-controlled InP/GaInP quantum dots (QDs). Spatially resolved low temperature cathodoluminescence proves the long-range ordering of the buried emitters, revealing a yield of ∼90% of optically active, positioned QDs and a strong suppression of emitters on interstitial positions. The emission of single QDs shows a pronounced degree of linear polarization along the [0,−1,1] crystal axis with an average degree of polarization of 94%. Photon correlation measurements of the emission from a single QD indicate the single-photon character of the exciton and biexciton emission lines as well as the cascaded nature of the photon pair.

• OSTI ID: 22254113
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 19 Vol. 103; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CATHODOLUMINESCENCE
CORRELATIONS
CRYSTALS
INDIUM PHOSPHIDES
PHOTONS
POLARIZATION
QUANTUM DOTS