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Nonlinear Acoustics at GHz Frequencies in a Viscoelastic Fragile Glass Former
Abstract : Using a picosecond pump-probe ultrasonic technique, we study the propagation of high-amplitude, laser-generated longitudinal coherent acoustic pulses in the viscoelastic fragile glass former DC704. We observe an increase of almost 10% in acoustic pulse propagation speed at the highest optical pump fluence which is a result of the supersonic nature of nonlinear propagation in the viscous medium. From our measurement, we deduce the nonlinear acoustic parameter of the glass former in the gigahertz frequency range across the glass transition temperature.
https://hal-univ-lemans.archives-ouvertes.fr/hal-02534230
Contributeur : Vitali Goussev <>
Soumis le : lundi 6 avril 2020 - 19:40:09
Dernière modification le : samedi 1 mai 2021 - 03:30:19
Contributeur : Vitali Goussev <>
Soumis le : lundi 6 avril 2020 - 19:40:09
Dernière modification le : samedi 1 mai 2021 - 03:30:19
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