All-linear time reversal by a dynamic artificial crystal

Andrii V. Chumak (), Vasil S. Tiberkevich, Alexy D. Karenowska, Alexander A. Serga, John F. Gregg, Andrei N. Slavin and Burkard Hillebrands
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Andrii V. Chumak: Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern
Vasil S. Tiberkevich: Oakland University
Alexy D. Karenowska: Clarendon Laboratory, University of Oxford
Alexander A. Serga: Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern
John F. Gregg: Clarendon Laboratory, University of Oxford
Andrei N. Slavin: Oakland University
Burkard Hillebrands: Fachbereich Physik and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern

Nature Communications, 2010, vol. 1, issue 1, 1-5

Abstract: Abstract The time reversal of pulsed signals or propagating wave packets has long been recognized to have profound scientific and technological significance. Until now, all experimentally verified time-reversal mechanisms have been reliant upon nonlinear phenomena such as four-wave mixing. In this paper, we report the experimental realization of all-linear time reversal. The time-reversal mechanism we propose is based on the dynamic control of an artificial crystal structure, and is demonstrated in a spin-wave system using a dynamic magnonic crystal. The crystal is switched from an homogeneous state to one in which its properties vary with spatial period a, while a propagating wave packet is inside. As a result, a linear coupling between wave components with wave vectors k≈π/a and k′=k−2ππ/a≈−π/a is produced, which leads to spectral inversion, and thus to the formation of a time-reversed wave packet. The reversal mechanism is entirely general and so applicable to artificial crystal systems of any physical nature.

Date: 2010
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DOI: 10.1038/ncomms1142

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