Demonstration of temporal cloaking
Demonstration of temporal cloaking
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DOI：
10.1038/nature10695
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发表时间：
2012-01-05
期刊：
影响因子：
64.8
通讯作者：
Gaeta, Alexander L.
中科院分区：
文献类型：
--
作者：
Fridman, Moti;Farsi, Alessandro;Gaeta, Alexander L.
最近的研究发现了操纵和控制电磁场以产生完美成像和空间隐身等效果的非凡能力(1,2)。为了实现空间隐形，需要操纵折射率，使来自探测器的光在物体周围流动，从而在空间中创建一个“洞”，而物体保持隐藏状态 (3-14)。或者，可能需要在有限的时间段内隐藏事件的发生，并且已经提出了时间隐身的想法，其中及时操纵材料的色散，在探测光束中产生“时间孔”以向观察者隐藏事件的发生（15）。该方法基于加速探测光束的前部并减慢其后部，以创建良好控制的时间间隙（在该间隙内发生事件），使得探测光束不会被事件以任何方式修改。然后通过色散的反向操纵将探测光束恢复到其原始形式。在这里，我们通过应用衍射和色散展宽之间的时空对偶性概念，展示了基于光纤的系统中的时间隐身的实验演示(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时间斗篷的性能，并表明当斗篷打开时，事件的幅度（在皮秒时间尺度）减少了一个数量级以上。这些结果是朝着完全时空隐形技术发展迈出的重要一步。
Recent research has uncovered a remarkable ability to manipulate and control electromagnetic fields to produce effects such as perfect imaging and spatial cloaking(1,2). 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 hidden(3-14). 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 observer(15). 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 broadening(16). 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.