Nonlinear Acoustics at GHz Frequencies in a Viscoelastic Fragile Glass Former
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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.
Date issued
2015-02Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies; Massachusetts Institute of Technology. Department of ChemistryJournal
Physical Review Letters
Publisher
American Physical Society
Citation
Klieber, Christoph, Vitalyi E. Gusev, Thomas Pezeril, and Keith A. Nelson. “Nonlinear Acoustics at GHz Frequencies in a Viscoelastic Fragile Glass Former.” Physical Review Letters 114, no. 6 (February 2015). © 2015 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114