Hypersound damping in vitreous silica measured by picosecond acoustics

Abstract

The attenuation of longitudinal acoustic phonons up to frequencies nearing 250 GHz is measured in vitreous silica with a picosecond optical technique. Taking advantage of interferences on the probe beam, difficulties encountered in early pioneering experiments are alleviated. Sound damping at 250 GHz and room temperature is consistent with relaxation dominated by anharmonic interactions with the thermal bath, extending optical Brillouin scattering data. Our result is at variance with claims of a recent deep-UV experiment which reported a rapid damping increase beyond 100 GHz. A comprehensive picture of the frequency dependence of sound attenuation in $v$-SiO${}_2$ can be proposed.

4 pages, 3 figures

References in corpus (1)

• Inhomogeneous elastic response of silica glass

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• Suppression of Brillouin oscillation in transparent free-standing diamond thin films in picosecond ultrasound
• A continuum model reproducing the multiple frequency crossovers in acoustic attenuation in glasses