School of Electronic Engineering and Computer Science, Queen Mary University of London, London, E1 4NS, United Kingdom.
Sci Rep. 2017 Jun 21;7(1):3929. doi: 10.1038/s41598-017-04410-4.
We report the design, fabrication and experimental verification of an illusion device working at microwave frequencies. A two dimensional topology optimization procedure is employed to find the binary layout of a dielectric coating that, when wrapped around a metallic cylinder, mimics the scattering from a predefined, arbitrarily-shaped dielectric object. Fabrication is carried out with 3D-printing and spatially resolved near field measurements in a waveguide configuration were performed, allowing us to map the illusion effect. Our work provides general guidelines for engineering electromagnetic illusions but can be extended to shape the near and far-field radiations using low index isotropic materials.
我们报告了一种工作在微波频率的幻象装置的设计、制作和实验验证。采用二维拓扑优化程序来寻找介电涂层的二进制布局，当包裹在金属圆柱上时，该涂层可以模拟从预定义的任意形状介电物体的散射。采用 3D 打印进行制作，并在波导配置中进行了空间分辨近场测量，使我们能够绘制幻象效果。我们的工作为工程电磁幻象提供了一般指导，但可以扩展到使用低折射率各向同性材料来改变近场和远场辐射。
