电厚Fabry-Pérot Ω双各向异性超颖表面作为虚拟减反射涂层和非局域场Transformers
Electrically Thick Fabry-Pérot Omega Bianisotropic Metasurfaces as Virtual Anti-Reflective Coatings and Non-Local Field Transformers
摘要：
欧米茄双各向异性超颖表面（OBMS）提供了惠更斯超颖表面（HMS）以前没有的波控制能力。这些增强的功能来自OBMS提供的额外自由度，并基于对具有抽象表面阻抗特性的零厚度表面的分析。然而，实际的元表面的设计已被证明是繁琐的。在这里，我们提出了一种新颖的，易于设计的结构来实现OBMS。扩展我们以前的工作，我们表明，两个明智的工程法布里-珀罗（FP）标准具的非对称级联可以形成OBMS元原子，以提供所需的波控制能力。实施此FP-OBMS异常折射，我们表明，双各向异性有效地产生一个虚拟的抗反射涂层的HMS，导致OBMS的效率提高。这个有趣的观察，由近似的封闭形式的解决方案支持，提供了一个原始的物理解释的机制下完美的异常折射，并用于解释第一次在角度响应的差异OBMS相比，HMS。实施FP-OBMS的更复杂的功能，分束，我们表明，FP-OBMS能够非本地激发表面波为此所需的，尽管是电厚。通过全波计算验证的这些结果表明，所提出的配置能够精确地再现理想（抽象）零厚度OBMS的散射特性，从而为实际实现具有奇异功能的波传输铺平了道路，其中一些功能以前从未与物理结构相关联。
英文摘要：
Omega bianisotropic metasurfaces (OBMS) provide wave-control capabilities not previously available with Huygens' metasurfaces (HMS). These enhanced capabilities derive from the additional degree of freedom provided by OBMS, and are based on analyses of zero-thickness surfaces with abstract surface impedance properties. However, the design of practical metasurfaces has proven tedious. Herein, we propose a novel, easily designed structure to realize OBMSs. Extending our previous work, we show that an asymmetrical cascade of two judiciously engineered Fabry-Perot (FP) etalons could form an OBMS meta-atom to provide desired wave control capabilities. Implementing this FP-OBMS for anomalous refraction, we show that bianisotropy effectively produces a virtual anti-reflective coating over a HMS, leading to the OBMS efficiency enhancement. This intriguing observation, backed by an approximate closed-form solution, provides an original physical interpretation of the mechanism underlying perfect anomalous refraction, and is used to explain for the first time differences in the angular response of OBMS in comparison to HMS. Implementing the FP-OBMS for the more intricate functionality of beam-splitting, we show that the FP-OBMS are capable of non-local excitation of surface waves required to this end, despite being electrically thick. These results, verified via full-wave computations, demonstrate the ability of the proposed configuration to meticulously reproduce the scattering properties of ideal (abstract) zero-thickness OBMS, thereby paving the path to practical realization of wave transmission with exotic functionalities, some of which have never before been associated with a physical structure.
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