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Related Experiment Video

Updated: Jul 4, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Single quantum dot controlled lasing effects in high-Q micropillar cavities.

S Reitzenstein1, C Böckler, A Bazhenov

  • 1Technische Physik, Universität Würzburg, Würzburg, Germany. stephan.reitzenstein@physik.uni-wuerzburg.de

Optics Express
|June 11, 2008
PubMed
Summary

Researchers observed reduced lasing threshold power in quantum dot (QD) microlasers by tuning the QD exciton to the cavity mode. Photon correlation confirmed single QD influence on lasing behavior.

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Area of Science:

  • Quantum Optics
  • Solid-State Physics
  • Nanophotonics

Background:

  • Micropillar cavities are crucial for enhancing light-matter interactions.
  • Individual quantum dots (QDs) offer potential for nanoscale lasing devices.
  • Understanding exciton-cavity coupling is key to optimizing QD laser performance.

Purpose of the Study:

  • To investigate lasing effects in optically pumped single quantum dots within high-Q micropillar cavities.
  • To demonstrate the impact of exciton-cavity resonance on the lasing threshold power.
  • To confirm the influence of a single quantum dot on lasing dynamics using photon correlation.

Main Methods:

  • Optical pumping of individual quantum dots embedded in high-Q micropillar cavities.
  • Measurement of threshold pump power under resonant and off-resonant excitation conditions.

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Last Updated: Jul 4, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
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Published on: October 13, 2017

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  • Photon correlation spectroscopy (g((2))(0)) to analyze light statistics below and above lasing threshold.

    • Main Results:

    • Threshold pump power was reduced by 50% (from 37 microW to 18 microW) when the quantum dot exciton was on-resonance with the cavity mode.
    • Photon correlation studies revealed distinct antibunching (g((2))(0) = 0.36) at resonance, indicative of single-dot lasing.
    • Off-resonant excitation showed g((2))(0) ≈ 1, characteristic of non-lasing or multi-emitter emission.

    Conclusions:

    • On-resonance coupling of a single quantum dot exciton to a cavity mode significantly lowers the lasing threshold.
    • Photon correlation measurements confirm the single quantum dot's role in initiating and sustaining lasing.
    • These findings highlight the potential of single QDs in high-Q cavities for efficient, low-threshold microlasers.