In recent years, a variety of interesting concepts have been proposed to enable the concealment of objects from detection or observation, including invisibility cloaking. For an object to remain truly transparent to an illumination wave, a cloak must restore the exact spatio-temporal profile of the wave, including both amplitude and phase variations across the entire illumination frequency spectrum, i.e., the full field. However, on the basis of their fundamental operating principles, present invisibility solutions force different frequency components of a broadband illumination wave to experience different phase variations, necessarily distorting the wave’s temporal profile and making the cloaking device inherently visible. In this work, we propose a new conceptual approach to the problem, enabling the realization of full-field broadband invisibility, experimentally demonstrated here for the first time to the best of our knowledge. This involves a customized and reversible redistribution of the illumination frequency content, allowing the wave to propagate through the object of interest while preventing any interaction between the wave and the object. We report the experimental concealment of a broadband optical filter from detection with a phase-coherent light pulse of 500 GHz bandwidth, showing full restoration of the complex temporal and spectral profiles of the pulse.

中文翻译：

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通过可逆波频谱控制实现全场宽带隐身

近年来，已经提出了各种有趣的概念以使得能够从检测或观察中隐藏物体，包括隐形隐身。为了使对象对照明波保持真正透明，披风必须恢复其确切的时空分布，包括整个照明频谱（即整个视场）的幅度和相位变化。然而，基于其基本的工作原理，当前的隐形解决方案迫使宽带照明波的不同频率分量经历不同的相位变化，从而必定使电波的时间分布失真，并使隐身装置具有固有的可见性。在这项工作中，我们提出了一种解决该问题的新概念方法，从而实现了全场宽带的隐身性，据我们所知，这是第一次在这里进行了实验性演示。这涉及照明频率内容的定制且可逆的重新分配，从而允许波传播通过感兴趣的对象，同时防止了波与对象之间的任何相互作用。