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Phys. Rev. Lett. 79, 407 - 410 (1997)

One-Channel Time Reversal of Elastic Waves in a Chaotic 2D-Silicon Cavity

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Carsten Draeger and Mathias Fink
Laboratoire Ondes et Acoustique, URA CNRS 1503, Université Paris VII Denis Diderot-Ecole Supérieure de Physique et de Chimie Industrielle de la Ville de Paris, 10 Rue Vauquelin, 75005 Paris, France

Received 17 March 1997; revised 25 March 1997

Acoustic time-reversal experiments usually need large arrays of transducers. It is shown that in a reflecting cavity with negligible absorption one is able to perform a time reversal of elastic waves using a single element. The field is measured at one point over a long period of time and the time-reversed signal is reinjected at the same position. Numerical simulations illustrate the process. Experiments carried out in silicon wafers show that it is possible to obtain an excellent temporal and spatial focusing quality.


©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v79/p407
DOI: 10.1103/PhysRevLett.79.407
PACS: 43.20.+g, 05.45.+b, 62.30.+d

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