Focusing beyond the diffraction limit with far-field time reversal
Focusing beyond the diffraction limit with far-field time reversal
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DOI：
10.1126/science.1134824
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发表时间：
2007-02-23
期刊：
影响因子：
56.9
通讯作者：
Fink, Mathias
中科院分区：
文献类型：
--
作者：
Lerosey, Geoffroy;De Rosny, Julien;Fink, Mathias
我们提出了一种亚波长聚焦微波的方法，同时使用放置在远场的时间反转镜和放置在聚焦点的近场的散射体的随机分布。远场时间反转镜用于建立时间反转的波场，其与随机介质相互作用以不仅再生传播波，而且再生在衍射极限以下重新聚焦所需的倏逝波。描述了小至波长的三十分之一的焦点。我们提出了一个应用于电信的例子，它显示了信息传输速率提高了3倍。
We present an approach for subwavelength focusing of microwaves using both a time-reversal mirror placed in the far field and a random distribution of scatterers placed in the near field of the focusing point. The far-field time-reversal mirror is used to build the time-reversed wave field, which interacts with the random medium to regenerate not only the propagating waves but also the evanescent waves required to refocus below the diffraction limit. Focal spots as small as one-thirtieth of a wavelength are described. We present one example of an application to telecommunications, which shows enhancement of the information transmission rate by a factor of 3.