用于电磁成像/错觉的超表面皮肤/全息图的表面磁化率合成
Surface Susceptibility Synthesis of Metasurface Skins/Holograms for Electromagnetic Camouflage/Illusions
摘要：
基于积分方程和广义片转换条件（IE-GSTCs）提出了一个系统的数值框架，用于在二维空间中合成封闭的元表面全息图和皮肤，以产生特定物体的电磁错觉，并作为一种特殊情况，将它们与背景进行对比。通用的全息图表面建模使用零厚度片模型的广义元表面表示在其表面磁化率，这是进一步集成到GSTC和IE电流场传播运营商。为了估计错觉的有效性，由观察者构建的场景的概念是从第一原理和一个简单的数学模型，称为结构化的现场观察（SFO），提出了基于空间傅立叶变换。使用数值例子，它示出，以重新创建的参考所需的字段在空间中的任何地方使用一个封闭的超颖表面全息图/皮肤，内部照明必须施加在全息图内部，除了施加外部照明领域。最后，几个数值例子简单，角度相关和动态的错觉。最后，展示了一个动态的空间包裹区域，它可以在给定的复杂场景中自由移动而不被观察者发现。
英文摘要：
A systematic numerical framework based on Integral Equations and Generalized Sheet Transition Conditions (IE-GSTCs) is presented in 2D to synthesize closed metasurface holograms and skins for creating electromagnetic illusions of specified objects and as a special case, to camouflaging them against their backgrounds. The versatile hologram surface is modeled using a zero-thickness sheet model of a generalized metasurface expressed in terms of its surface susceptibilities, which is further integrated into the GSTCs and the IE current-field propagation operators. To estimate the effectiveness of the illusions, the notion of a scene constructed by an observer is developed from first principles and a simple mathematical model, referred to as a Structured Field Observation (SFO), based on spatial Fourier transform is proposed. Using numerical examples, it is shown that to recreate the reference desired fields everywhere in space using a closed metasurface hologram/skin, an internal illumination must be applied inside the hologram, in addition to the applied external illumination fields. Finally, several numerical examples are presented for simple, angle-dependent and dynamic illusions. Finally, a dynamic camouflaged region of space, which can freely move inside a given complex scene without being detected by the observer is demonstrated.
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