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Coherent acoustic phonons in phonon cavities investigated by asynchronous optical sampling

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2007

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Hudert, Florian

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Journal of Physics. 2007, 92, 12012. ISSN 1742-6588. eISSN 1742-6596

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Using a recently introduced measurement technique, called asynchronous optical sampling (ASOPS), we have investigated the dynamics of coherent acoustic phonons in a semiconductor heterostructure composed of a GaAs film between two GaAs/AlAs superlattices, serving as a cavity for acoustic phonons. Measurements were performed at liquid helium temperatures. The possibility to perform two-color pump-probe spectroscopy allowed us to tune the probe pulse energy to the cavity band gap, while sweeping the pump pulse energy over the superlattice resonance. The large measurement window of 1 ns in combination with a resolution of about 150 fs made a detailed analysis of the observed phonon dynamics possible. We observed a long lived oscillation in the gap of the phonon dispersion at 466 GHz, which we attribute to a cavity mode.

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ISO 690HUDERT, Florian, Albrecht BARTELS, Christof JANKE, Thomas DEKORSY, Klaus KÖHLER, 2007. Coherent acoustic phonons in phonon cavities investigated by asynchronous optical sampling. In: Journal of Physics. 2007, 92, 12012. ISSN 1742-6588. eISSN 1742-6596
BibTex
@article{Hudert2007Coher-983,
  year={2007},
  title={Coherent acoustic phonons in phonon cavities investigated by asynchronous optical sampling},
  volume={92},
  issn={1742-6588},
  journal={Journal of Physics},
  author={Hudert, Florian and Bartels, Albrecht and Janke, Christof and Dekorsy, Thomas and Köhler, Klaus},
  note={Article Number: 12012}
}
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