title: Optical generation of gigahertz-frequency shear acoustic waves in liquid glycerol.
abstract: Picosecond laser ultrasonic techniques for acoustic wave generation and detection have been employed to probe shear acoustic waves in liquid glycerol at gigahertz frequencies. The experimental approach uses a unique laser pulse shaping technique and a crystallographically canted metal layer to generate frequency-tunable transverse acoustic waves, and uses time-domain coherent Brillouin scattering to detect the waves after they propagate through a liquid layer and into a solid substrate. A linear frequency dependence is found for both the shear speed and attenuation rate in glycerol.
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. pezeril@mit.edu
authors.forename: T
authors.initials: T
authors.lastname: Pezeril
authors.forename: C
authors.initials: C
authors.lastname: Klieber
authors.forename: S
authors.initials: S
authors.lastname: Andrieu
authors.forename: K A
authors.initials: KA
authors.lastname: Nelson