Cavity quantum electrodynamics studies with site-controlled InGaAs quantum dots integrated into high quality microcavities

S. Reitzenstein (Invited author), C. Schneider (Invited author), F. Albert (Invited author), A. Huggenberger (Invited author), T. Heindel (Invited author), M. Lermer (Invited author), Søren Stobbe (Invited author), P. Weinmann (Invited author), Peter Lodahl (Invited author), S. Höfling (Invited author), M. Kamp (Invited author), L. Worschech (Invited author), A. Forchel (Invited author)

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Semiconductor quantum dots (QDs) are fascinating nanoscopic structures for photonics and future quantum information technology. However, the random position of self-organized QDs inhibits a deterministic coupling in devices relying on cavity quantum electrodynamics (cQED) effects which complicates, e.g., the large scale fabrication of quantum light sources. As a result, large efforts focus on the growth and the device integration of site-controlled QDs. We present the growth of low density arrays of site-controlled In(Ga)As QDs where shallow etched nanoholes act as nucleation sites. The nanoholes are located relative to cross markers which allows for a precise spatial alignment of the site-controlled QDs (SCQDs) and the photonic modes of high quality microcavites with an accuracy better than 50 nm. We also address the optical quality of the SCQDs in terms of the single SCQD emission mode linewidth, the oscillator strength and the quantum efficiency. A stacked growth of strain coupled SCQDs forming on wet chemically etched nanoholes provide the smallest linewidth with an average value of 210 μeV. Using time resolved photoluminescence studies on samples with a varying thickness of the capping layer we determine a quantum efficiency of the SCQD close to 50% and an oscillator strength of about 10. Finally, single photon emission with associated with g(2)(0) = 0.12 of a weakly coupled SCQD-micropillar system will be presented.
Original languageEnglish
JournalProceedings of the SPIE - The International Society for Optical Engineering
Pages (from-to)794702
Publication statusPublished - 2011
EventQuantum Dots and Nanostructures : Synthesis, Characterization, and Modeling - San Francisco, USA
Duration: 1 Jan 2011 → …
Conference number: 8


ConferenceQuantum Dots and Nanostructures : Synthesis, Characterization, and Modeling
CitySan Francisco, USA
Period01/01/2011 → …

Bibliographical note

Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Quantum dot
  • Single photon source
  • Quantum efficiency
  • Semiconductor
  • Site controlled quantum dots
  • Microcavity

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