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Parametric polariton amplification in semiconductor microcavities.

G Messin1, J P Karr, A Baas

  • 1Laboratoire Kastler Brossel, Université Paris 6, Ecole Normale Supérieure et CNRS, UPMC Case 74, 4 place Jussieu, 75252 Paris Cedex 05, France.

Physical Review Letters
|October 3, 2001
PubMed
Summary

We demonstrate coherent polariton wave mixing in semiconductor microcavities. Our experiments reveal a phase dependence in emission amplification, confirming nonlinear coherent properties.

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Area of Science:

  • Solid-state physics
  • Quantum optics
  • Materials science

Background:

  • Semiconductor microcavities exhibit unique quantum phenomena in the strong coupling regime.
  • Nonlinear emission from these systems can be interpreted through processes like parametric polariton four-wave mixing.

Purpose of the Study:

  • To experimentally demonstrate and characterize the coherence properties of nonlinear emission from semiconductor microcavities.
  • To investigate the role of parametric polariton four-wave mixing in these systems.

Main Methods:

  • Utilized a degenerate four-wave mixing geometry for experiments.
  • Measured emission properties, including threshold dependence on pump power and spectral blueshift.
  • Analyzed the phase dependence of emission amplification.

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Main Results:

  • Observed threshold dependence of emission on pump power, consistent with theoretical predictions.
  • Detected a spectral blueshift in the emission.
  • Crucially, observed a phase dependence of amplification, indicating a coherent process.

Conclusions:

  • The experimental results confirm the coherent nature of the nonlinear emission process.
  • The observed phase dependence is a direct signature of coherent polariton wave mixing.
  • These findings advance the understanding of quantum nonlinear optics in semiconductor microcavities.