Time Reversal of ElectromagneticWaves
G. Lerosey, J. de Rosny, A. Tourin, A. Derode, G. Montaldo, and M. Fink
Laboratoire Ondes et Acoustique, ESPCI, Universite´ Paris VII, UMR 7587, 10 rue Vauquelin, 75005 Paris France
(Received 9 December 2003; published 14 May 2004)


We report the first experimental demonstration of time-reversal focusing with electromagnetic waves.
An antenna transmits a 1-
s electromagnetic pulse at a central frequency of 2.45 GHz in a high-Q
cavity. Another antenna records the strongly reverberated signal. The time-reversed wave is built and
transmitted back by the same antenna acting now as a time-reversal mirror. The wave is found to
converge to its initial source and is compressed in time. The quality of focusing is determined by the
frequency bandwidth and the spectral correlations of the field within the cavity.

[link to kom.aau.dk]

It`s a PDF so beware of download.

Time reversal from the powers that be. Peer read and establishment friendly.