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Demonstration of temporal cloaking

机译：暂时隐身的示范

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摘要

Recent research has uncovered a remarkable ability to manipulate and control electromagnetic fields to produce effects such as perfect imaging and spatial cloaking1'2. To achieve spatial cloaking, the index of refraction is manipulated to flow light from a probe around an object in such a way that a 'hole' in space is created, and the object remains hidden3"14. Alternatively, it may be desirable to cloak the occurrence of an event over a finite time period, and the idea of temporal cloaking has been proposed in which the dispersion of the material is manipulated in time, producing a 'time hole' in the probe beam to hide the occurrence of the event from the observer15. This approach is based on accelerating the front part of a probe light beam and slowing down its rear part to create a well controlled temporal gap-inside which an event occurs-such that the probe beam is not modified in any way by the event. The probe beam is then restored to its original form by the reverse manipulation of the dispersion. Here we present an experimental demonstration of temporal cloaking in an optical fibre-based system by applying concepts from the space-time duality between diffraction and dispersive broadening16. We characterize the performance of our temporal cloak by detecting the spectral modification of a probe beam due to an optical interaction and show that the amplitude of the event (at the picosecond timescale) is reduced by more than an order of magnitude when the cloak is turned on. These results are a significant step towards the development of full spatio-temporal cloaking.
机译：最近的研究发现了一种出色的能力，可以操纵和控制电磁场，以产生诸如完美成像和空间隐身的效果1'2。为了实现空间隐身，操纵折射率以使来自探针的光以某种方式在物体周围流动，从而在空间中形成“孔”，并且物体保持隐藏状态“ 3” 14。或者，可能希望隐身在有限的时间段内发生事件，并且提出了时间隐身的想法，其中及时控制了材料的分散，在探测光束中产生了“时间孔”以隐藏事件的发生。这种方法是基于加速探查光束的前部并放慢其后部，以在事件发生时在内部形成一个良好控制的时间间隙，从而使探查光束不会以任何方式被修改。然后通过对色散的反向操作将探测光束恢复到其原始形式，这里我们通过应用时空对偶概念，对基于光纤的系统中的时间隐身进行实验演示。在衍射和色散加宽之间16。我们通过检测由于光学相互作用而引起的探测光束的光谱变化来表征我们的颞隐身衣的性能，并表明当隐身衣被转动时，事件的幅度（在皮秒时标处）降低了一个数量级以上上。这些结果是朝着完整的时空隐身发展的重要一步。

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  • 来源
    《Nature》 |2012年第7379期|p.62-65|共4页
  • 作者

    Moti Fridman; Alessandro Farsi; Yoshitomo Okawachi; Alexander L. Gaeta;

  • 作者单位

    School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA;

    School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA;

    School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA;

    School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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