Bright single-photon sources in bottom-up tailored nanowires

Michael E. Reimer (), Gabriele Bulgarini, Nika Akopian, Moïra Hocevar, Maaike Bouwes Bavinck, Marcel A. Verheijen, Erik P.A.M. Bakkers, Leo P. Kouwenhoven and Val Zwiller
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Michael E. Reimer: Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Gabriele Bulgarini: Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Nika Akopian: Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Moïra Hocevar: Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Maaike Bouwes Bavinck: Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Marcel A. Verheijen: Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands.
Erik P.A.M. Bakkers: Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Leo P. Kouwenhoven: Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.
Val Zwiller: Kavli Institute of Nanoscience, Delft University of Technology, 2600 GA Delft, The Netherlands.

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract The ability to achieve near-unity light-extraction efficiency is necessary for a truly deterministic single-photon source. The most promising method to reach such high efficiencies is based on embedding single-photon emitters in tapered photonic waveguides defined by top-down etching techniques. However, light-extraction efficiencies in current top-down approaches are limited by fabrication imperfections and etching-induced defects. The efficiency is further tempered by randomly positioned off-axis quantum emitters. Here we present perfectly positioned single quantum dots on the axis of a tailored nanowire waveguide using bottom-up growth. In comparison to quantum dots in nanowires without waveguides, we demonstrate a 24-fold enhancement in the single-photon flux, corresponding to a light-extraction efficiency of 42%. Such high efficiencies in one-dimensional nanowires are promising to transfer quantum information over large distances between remote stationary qubits using flying qubits within the same nanowire p–n junction.

Date: 2012
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DOI: 10.1038/ncomms1746

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