Focusing properties of near-field time reversal

被引：36
|
作者：
de Rosny, Julien [1 ]
Fink, Mathias [1 ]
机构：
[1] Univ Paris 07, CNRS, ESPCI, Lab Ondes & Acoust,UMR 7587, F-75005 Paris, France
来源：
PHYSICAL REVIEW A | 2007年 / 76卷 / 06期
关键词：
D O I：
10.1103/PhysRevA.76.065801
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A time-reversal mirror (TRM) is a plane apparatus that generates the time symmetric of a wave produced by an initial source. Here we look for the conditions to obtain subwavelength focusing when the initial source is in the near field of the TRM and the propagating medium is homogeneous and isotropic. Three variants of TRM are studied: TRM made of monopoles, dipoles, or both of them. The analysis is performed in terms of evanescent and propagative waves. We conclude that only the dipole-TRM leads to subwavelength focusing.
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页数：4
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