Acoustic waves undetectable by transient reflectivity measurements

A free-standing GaAs membrane is investigated by pump-probe reflectivity measurements with femtosecond laser pulses of 400-nm wavelength. It is found that the detected wide spectrum of laser-generated coherent strain waves in the membrane does not contain a specific hypersonic frequency. Theoretical analysis reveals that this effect is related to zero sensitivity of the acousto-optic detection at a particular frequency defined by the wavelength of the probe laser pulse on the mechanical free surface of the GaAs membrane. We predict that a similar behavior is expected in Si and Au membranes and films, indicating that the presence of zeros in the spectral transformation function of acousto-optic conversion is a rather general phenomenon in picosecond ultrasonics that has so far been neglected.

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HE, Chuan, Oliver RISTOW, Martin GROSSMANN, Delia BRICK, Yuning GUO, Martin SCHUBERT, Mike HETTICH, Vitalyi GUSEV, Thomas DEKORSY, 2017. Acoustic waves undetectable by transient reflectivity measurements. In: Physical Review B. 2017, 95(18), 184302. ISSN 2469-9950. eISSN 2469-9969. Available under: doi: 10.1103/PhysRevB.95.184302

BibTex

@article{He2017-05-11Acous-39415,
  year={2017},
  doi={10.1103/PhysRevB.95.184302},
  title={Acoustic waves undetectable by transient reflectivity measurements},
  number={18},
  volume={95},
  issn={2469-9950},
  journal={Physical Review B},
  author={He, Chuan and Ristow, Oliver and Grossmann, Martin and Brick, Delia and Guo, Yuning and Schubert, Martin and Hettich, Mike and Gusev, Vitalyi and Dekorsy, Thomas},
  note={Article Number: 184302}
}

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Publikation:
Acoustic waves undetectable by transient reflectivity measurements