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Acoustic waves undetectable by transient reflectivity measurements

Abstract : 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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https://hal-univ-lemans.archives-ouvertes.fr/hal-02536017
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Soumis le : mardi 7 avril 2020 - 19:20:49
Dernière modification le : vendredi 30 avril 2021 - 16:14:08

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Chuan He, Oliver Ristow, Martin Grossmann, Delia Brick, Yuning Guo, et al.. Acoustic waves undetectable by transient reflectivity measurements. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2017, 95 (18), ⟨10.1103/PhysRevB.95.184302⟩. ⟨hal-02536017⟩

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