According to the Equivalence Principle, any distribution of electromagnetic fields can be generated within a closed region by suitable electric and magnetic sources lying on its bounding surface. In electromagnetic theory, these sources have been used as fictitious analytical tools. However, this has changed in recent years with the development of “Huygens's metasurfaces,” which are subwavelength thin sheets of artificial active and/or passive elements. With proper configuration, these elements can physically approximate the aforementioned sources, enabling precise manipulation of electromagnetic waves in extraordinary manners. Given their potential, this work aims to provide an overview of Huygens's metasurfaces with a focus on cloaking applications. After an exposition of general operation and design principles, both active and passive Huygens's cloaks are described.

中文翻译：

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被动和主动惠更斯超颖表面的隐形隐身

根据等效原理，在封闭区域内可以通过位于其边界面上的合适的电和磁源来生成电磁场的任何分布。在电磁理论中，这些来源已用作虚拟分析工具。但是，随着“惠更斯超表面”的发展，这种情况已经改变，“惠更斯超表面”是人造有源和/或无源元件的亚波长薄片。通过适当的配置，这些元件可以在物理上近似上述源，从而能够以非凡的方式精确地操纵电磁波。鉴于其潜力，这项工作旨在概述惠更斯的超表面，并着重于隐身应用程序。在阐述了一般的操作和设计原则之后，