Extraction of the beta-factor for single quantum dots coupled to a photonic crystal waveguide

Henri Thyrrestrup Nielsen, Luca Sapienza, Peter Lodahl

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Abstract

We present measurements of the β-factor, describing the coupling efficiency of light emitted by single InAs/GaAs semiconductor quantum dots into a photonic crystal waveguide mode. The β-factor is evaluated by means of time resolved frequency-dependent photoluminescence spectroscopy. The emission wavelength of single quantum dots is temperature tuned across the band edge of a photonic crystal waveguide and the spontaneous emission rate is recorded. Decay rates up to 5.7 ns−1, corresponding to a Purcell factor of 5.2, are measured and β-factors up to 85% are extracted. These results prove the potential of photonic crystal waveguides in the realization of on-chip single-photon sources.
Original languageEnglish
JournalApplied Physics Letters
Volume96
Issue number23
Pages (from-to)231106
ISSN0003-6951
DOIs
Publication statusPublished - 2010

Bibliographical note

Copyright (2010) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

  • energy gap
  • III-V semiconductors
  • gallium arsenide
  • semiconductor quantum dots
  • photoluminescence
  • photonic crystals
  • indium compounds
  • time resolved spectra

Cite this

Nielsen, Henri Thyrrestrup ; Sapienza, Luca ; Lodahl, Peter. / Extraction of the beta-factor for single quantum dots coupled to a photonic crystal waveguide. In: Applied Physics Letters. 2010 ; Vol. 96, No. 23. pp. 231106.
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Extraction of the beta-factor for single quantum dots coupled to a photonic crystal waveguide. / Nielsen, Henri Thyrrestrup; Sapienza, Luca; Lodahl, Peter.

In: Applied Physics Letters, Vol. 96, No. 23, 2010, p. 231106.

Research output: Contribution to journalJournal articleResearchpeer-review

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T1 - Extraction of the beta-factor for single quantum dots coupled to a photonic crystal waveguide

AU - Nielsen, Henri Thyrrestrup

AU - Sapienza, Luca

AU - Lodahl, Peter

N1 - Copyright (2010) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

PY - 2010

Y1 - 2010

N2 - We present measurements of the β-factor, describing the coupling efficiency of light emitted by single InAs/GaAs semiconductor quantum dots into a photonic crystal waveguide mode. The β-factor is evaluated by means of time resolved frequency-dependent photoluminescence spectroscopy. The emission wavelength of single quantum dots is temperature tuned across the band edge of a photonic crystal waveguide and the spontaneous emission rate is recorded. Decay rates up to 5.7 ns−1, corresponding to a Purcell factor of 5.2, are measured and β-factors up to 85% are extracted. These results prove the potential of photonic crystal waveguides in the realization of on-chip single-photon sources.

AB - We present measurements of the β-factor, describing the coupling efficiency of light emitted by single InAs/GaAs semiconductor quantum dots into a photonic crystal waveguide mode. The β-factor is evaluated by means of time resolved frequency-dependent photoluminescence spectroscopy. The emission wavelength of single quantum dots is temperature tuned across the band edge of a photonic crystal waveguide and the spontaneous emission rate is recorded. Decay rates up to 5.7 ns−1, corresponding to a Purcell factor of 5.2, are measured and β-factors up to 85% are extracted. These results prove the potential of photonic crystal waveguides in the realization of on-chip single-photon sources.

KW - energy gap

KW - III-V semiconductors

KW - gallium arsenide

KW - semiconductor quantum dots

KW - photoluminescence

KW - photonic crystals

KW - indium compounds

KW - time resolved spectra

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DO - 10.1063/1.3446873

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SP - 231106

JO - Applied Physics Letters

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