Generation and detection of shear acoustic waves in metal submicrometric films with ultrashort laser pulses

Phys Rev Lett. 2005 Apr 29;94(16):166106. doi: 10.1103/PhysRevLett.94.166106. Epub 2005 Apr 29.

Abstract

We present experimental and calculational results demonstrating the thermoelastic generation of shear acoustic waves using femtosecond laser pulses in submicrometric isotropic aluminum films. We show that the generation of the shear waves is correlated to the reduction of the width of the optoacoustic source on the surface. The presence of shear waves is related to acoustic diffraction and acoustic mode conversion at the thin film interfaces.