Do THz acoustic waves propagate in glass?

Many theories predict that the attenuation of acoustic waves in glasses increases very strongly at high frequencies, due to a vibrational anomaly known as the “boson peak”.

Using a new ultrafast acoustic technique, the researchers investigated silica glass over a frequency range that had so far been little explored, at both low and high temperatures. They observed an unexpected wave behavior and a strong frequency-dependent attenuation that dominates the usual thermal effects. Three researchers of the Team “Physics of Glasses” contributed to this result.

Read more : https://www.inp.cnrs.fr/en/cnrsinfo/do-thz-acoustic-waves-propagate-glass