Bright single-photon sources based on self-aligned quantum dots in tapered nanowire waveguides

M.E. Reimer, G. Bulgarini, E.P.A.M. Bakkers, D. Dalacu, P.J. Poole, V. Zwiller

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)


Single quantum dots embedded in tapered nanowire waveguides have emerged as leading candidates for designing high efficiency single-photon and entangled photon sources, with efficiencies exceeding 90%. Here we have developed a bottom-up growth approach that allows for independent control of boththe quantum dot size, and position, as well as the nanowire shape. Importantly, by design, the single quantum dot is always found perfectly on the nanowire axis. By integrating a gold mirror at the base of a tapered nanowire waveguide we obtain a 20-fold enhancement in the single-photon flux in comparison to no waveguide. The 20-fold enhancement is accompanied by a shortening of the exciton lifetime as the quantum emitter couples to the fundamental waveguide mode with an increased rate. Finally, the optical quality of the emitter is drastically improved by removing the nanowire stacking faults in the vicinity of the quantum dot. As a result, we demonstrate very pure single-photon emission with a probability of multi-photon emission below 1%, and an emission line width that is reduced by at least an order of magnitude (

Original languageEnglish
Title of host publicationPhysics and Simulation of Optoelectronic Devices XXI
EditorsB. Witzigmann, M. Osinski, F. Henneberger, H. Arakawa
Number of pages9
ISBN (Print)9780819493880
Publication statusPublished - 2013
EventPhysics and Simulation of Optoelectronic Devices XXI - San Francisco, United States
Duration: 4 Feb 20137 Feb 2013

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


ConferencePhysics and Simulation of Optoelectronic Devices XXI
Country/TerritoryUnited States
CitySan Francisco


  • entangled photons
  • fundamental mode
  • high efficiency
  • Nanowire
  • quantum dot
  • self-aligned
  • single-photon
  • stacking faults
  • taper
  • waveguide


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