Microscale multiple scattering of coherent surface acoustic wave packets probed with gigahertz time-reversal acoustics.
The multiple scattering of coherent surface acoustic wave packets in a microstructure is studied using an ultrafast optical technique. By recording a set of acoustic transfer functions, we show that it is possible to implement time-reversal acoustics and refocus the wave packets up to the GHz range, two orders of magnitude higher than usual. Many applications in time-reversal acoustics are thus transposable to correspondingly smaller structures, opening the way to efficient nondestructive characterization and manipulation of multiple scattering on the microscale.
Tournat
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V
Department of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan.
Profunser
D M
DM
Muramoto
E
E
Matsuda
O
O
Takezaki
T
T
Sueoka
S
S
Wright
O B
OB