Microscale multiple scattering of coherent surface acoustic wave packets probed with gigahertz time-reversal acoustics

Received 26 April 2006; published 15 August 2006The multiple scattering of coherent surface acoustic wave packets in a microstructure is studied using anultrafast optical technique. By recording a set of acoustic transfer functions, we show that it is possible toimplement time-reversal acoustics and refocus the wave packets up to the GHz range, two orders of magnitudehigher than usual. Many applications in time-reversal acoustics are thus transposable to correspondinglysmaller structures, opening the way to efficient nondestructive characterization and manipulation of multiplescattering on the microscale.DOI: 10.1103/PhysRevE.74.026604 PACS number s : 43.35. d, 42.25.Dd, 42.25.Fx, 78.20.Hp