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Opt Lett. 2007 Nov 1;32(21):3107-9.

Theory of the time reversal cavity for electromagnetic fields.

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  • 1Laboratoire d'Energétique Moléculaire et Macroscopique, Combustion, Ecole Central Paris, Centre National de la Recherche Scientifique, Châtenay-Malabry, France.


We derive a general expression of the electric dyadic Green function in a time-reversal cavity, based on vector diffraction theory in the frequency domain. Our theory gives a rigorous framework to time-reversal experiments using electromagnetic waves and suggests a methodology to design structures generating subwavelength focusing after time reversal.

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