微波波段小型光学隐身衣的反求设计与实验验证
Inverse design of compact optical cloaks and experimental demonstration at microwave frequencies
摘要：
光子学中的逆向设计作为一种超越直觉设计的强有力的方法越来越受到人们的关注。在这封信中，我们提出了在微波频率的紧凑型光学斗篷的逆设计和实验演示进行。数值计算了矩形和圆形两种不同结构的斗篷，以减少入射光与理想导体物体相互作用时的散射。所设计的隐身结构由具有低折射率的介电聚乳酸材料组成，并且通过3D打印方法制造。实验测量结果与数值计算结果吻合较好。所设计的覆盖（4λ x 4λ）面积的区域使得能够隐藏λ直径的圆形物体，其中λ表示入射光的波长。所提出的方法可以实现具有各种大小和形状的不同对象的隐藏。
英文摘要：
Inverse design in photonics has gathered increasing attention as a powerful approach that goes beyond the intuition-based designs. In this Letter, we present the inverse design and experimental demonstration of compact optical cloaks at microwave frequencies is conducted. Two different configurations of rectangular and circular cloaks are numerically designed to reduce the scatterings of incident light interacting with a perfect electrical conductor object. The designed cloaking structures consist of dielectric polylactide material with a low refractive index and they are fabricated by 3D printing approach. The experimental measurements are in good agreement with the numerical calculations. The designed region covering (4λ x 4λ) area enables hiding circular object of λ diameter where λ denotes the wavelength of incident light. The proposed approach may enable the concealment of different objects possessing various size and shapes.
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