Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1759888 | Ultrasonics | 2008 | 4 Pages |
Abstract
In this paper, acute focusing of the laser pump beam (≈0.5 μm) on the sample surface allows picosecond acoustic diffraction in thin metallic films. The resulting wavefronts propagate at a group velocity which differs from phase velocities in anisotropic films. Waveforms have been experimentally recorded in a gold layer (2.1 μm thick) for several distances between pump and probe on the sample surface. A specified signal processing based on a Synthetic Focalization Technique allows analyzing the space repartition of the acoustic wave vectors for both longitudinal and shear waves. Stiffness coefficients of the gold layer are then identified from wave arrival times.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Acoustics and Ultrasonics
Authors
B. Audoin, M. Perton, N. Chigarev, C. Rossignol,