Focusing properties of near-field time reversal
Focusing properties of near-field time reversal
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DOI：
10.1103/physreva.76.065801
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发表时间：
2007-12-01
影响因子：
2.9
通讯作者：
Fink, Mathias
中科院分区：
文献类型：
--
作者：
de Rosny, Julien;Fink, Mathias
时间反转镜（TRM）是一种平面装置，它产生的波与初始源产生的波时间对称。在这里，我们寻找的条件下，获得亚波长聚焦时，初始源是在近场的TRM和传播介质是均匀的和各向同性的。TRM的三种变体进行了研究：TRM的单极，偶极子，或两者兼而有之。分析是在倏逝波和传播波。我们的结论是，只有偶极TRM导致亚波长聚焦。
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.