用于产生电磁错觉的超表面全息图的表面磁化率合成
Surface Susceptibility Synthesis of Metasurface Holograms for creating Electromagnetic Illusions
摘要：
提出了一种系统的方法来利用电磁（EM）元表面的丰富的场变换能力，用于使用元表面全息图的概念来创建各种错觉。本文提出了一种系统级的超表面全息图合成方法，该方法中全息图与待投影的期望物体协同设计。提出了一种结构化的方法来分类的EM错觉的创造更好的组织和易处理的整体综合问题。所述描绘是根据要重建的对象的初始入射（参考）照明（前/背光）、错觉的位置（后/前）和用于创建错觉的照明（前/后）。因此，分类是基于要重建的参考对象、测量对象的观察者、参考和照明场的取向和放置以及创建虚像的超表面全息图的期望放置之间的特定关系。基于积分方程和广义片层转换条件，提出了一种合成超表面全息图的一般设计方法，其中超表面全息图被描述为具有张量表面磁化率密度的零厚度片层。选择了几种选定的配置来说明2D全息图创建的各个方面，以及合成过程中所需的人工反向传播散射场的新型数值技术。最后讨论了超颖表面尺寸和照明场强对重建散射场质量的影响。
英文摘要：
A systematic approach is presented to exploit the rich field transformation capabilities of Electromagnetic (EM) metasurfaces for creating a variety of illusions using the concept of metasurface holograms. A system level approach to metasurface hologram synthesis is presented here, in which the hologram is co-designed with the desired object to be projected. A structured approach for the classification of the creation of EM illusions is proposed for better organization and tractability of the overall synthesis problem. The deliniation is in terms of the initial incident (reference) illumination of the object to be recreated (front/back-lit), the position of illusion (posterior/anterior), and the illumination used to create the illusion (front/back). Therefore the classification is based on the specific relationship between the reference object to be recreated, the observer measuring the object, the orientation and placement of the reference and illumination field, and the desired placement of the metasurface hologram creating a virtual image. In the paper a general design procedure to synthesize metasurface holograms is presented based on Integral Equations (IE) and Generalized Sheet Transition Conditions (GSTCs), where the metasurface hologram is described as zero thickness sheet with tensorial surface susceptibility densities. Several selected configurations are chosen to illustrate various aspects of the hologram creation in 2D, along with a novel numerical technique to artificially reverse propagate the scattered fields, required in the synthesis process. Finally, the impact of the metasurface size and the illumination field strength on the quality of the reconstructed scattered fields is also discussed.
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