等离子体隐身：有限长度、斜照明和交叉偏振耦合
Plasmonic Cloaking of Cylinders: Finite Length, Oblique Illumination and Cross-Polarization Coupling
摘要：
近年来，超材料隐身技术被提出并进行了研究。其中之一，散射抵消技术，或等离子体隐身，利用适当设计的薄均匀超材料覆盖物的等离子体效应，以大幅抑制特定频率范围内的中等大小的物体的散射。除了其固有的简单性，这种技术也持有各向同性响应和弱偏振依赖的承诺。它的理论已被广泛应用于对称的几何形状和规范的3D形状，但它的应用到细长的物体还没有探索相同的细节水平。在这里，我们推导出封闭形式的理论公式，无限柱任意波入射下，并验证其性能与全波数值模拟，也考虑了有限长度的影响和截断效应的圆柱体。特别是，我们发现，一个单一的各向同性（理想化）的隐身层可以成功地抑制占主导地位的散射系数的适度薄的细长物体，即使是有限的长度与入射波长相当，提供了一个弱的依赖于入射角。这些结果可能为等离子体隐身在各种感兴趣的实际场景中的应用铺平道路。
英文摘要：
Metamaterial cloaking has been proposed and studied in recent years following several interesting approaches. One of them, the scattering-cancellation technique, or plasmonic cloaking, exploits the plasmonic effects of suitably designed thin homogeneous metamaterial covers to drastically suppress the scattering of moderately sized objects within specific frequency ranges of interest. Besides its inherent simplicity, this technique also holds the promise of isotropic response and weak polarization dependence. Its theory has been applied extensively to symmetrical geometries and canonical 3D shapes, but its application to elongated objects has not been explored with the same level of detail. We derive here closed-form theoretical formulas for infinite cylinders under arbitrary wave incidence, and validate their performance with full-wave numerical simulations, also considering the effects of finite lengths and truncation effects in cylindrical objects. In particular, we find that a single isotropic (idealized) cloaking layer may successfully suppress the dominant scattering coefficients of moderately thin elongated objects, even for finite lengths comparable with the incident wavelength, providing a weak dependence on the incidence angle. These results may pave the way for application of plasmonic cloaking in a variety of practical scenarios of interest.
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