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. 2004 May 14;92(19):193904.
doi: 10.1103/PhysRevLett.92.193904. Epub 2004 May 14.

Time reversal of electromagnetic waves

G Lerosey  1 , J de Rosny, A Tourin, A Derode, G Montaldo, M Fink
Affiliations

Time reversal of electromagnetic waves

G Lerosey et al. Phys Rev Lett. .

Abstract

We report the first experimental demonstration of time-reversal focusing with electromagnetic waves. An antenna transmits a 1-micros 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.

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