Liu Yi, Ouyang Chunmei, Xu Quan, Su Xiaoqiang, Ma Jiajun, Zhao Jing, Li Yanfeng, Tian Zhen, Gu Jianqiang, Liu Liyuan, Han Jiaguang, Zhang Weili
Center for Terahertz Waves and College of Precision Instruments and Optoelectronics Engineering, and Key Laboratory of Optoelectronic Information Technology (Ministry of Education), Tianjin University, Tianjin 300072, China.
Institute of Solid State Physics, College of Physics and Electronic Science, Shanxi Province Key Laboratory of Microstructure Electromagnetic Functional Materials, Shanxi Datong University, Datong 037009, China.
Nanophotonics. 2021 Nov 30;11(9):1977-1987. doi: 10.1515/nanoph-2021-0561. eCollection 2022 Apr.
Hyperbolic metasurfaces with unique dispersion properties can manipulate light-matter interactions according to the demands. However, due to their inherent physical properties, topological transitions (flat bands) exist only in the orthogonal directions, which greatly limit their application. Here, we unveil rich dispersion engineering and topological transitions in hyperbolic metasurfaces. Based on the effective medium theory, the rotation matrix is introduced into the dispersion relation to explain the distorted energy band diagrams, iso-frequency contours and higher-order multi-dipoles of the novel twisted metasurfaces, thereby forming multi-directional topological transitions and surface plasmon polariton propagation. Furthermore, we develop an integrated model to realize new dual-channel negative refraction and nondiffraction negative refraction. The phenomena observed in the experiments match well with the simulations, which proves that the designed metasurfaces make new types of negative refraction possible and will help to overcome the diffraction limit. The hyperbolic metasurfaces presented here exhibit exceptional capabilities for designing microscopes with a super lens at the molecular level, concealment of military aircraft, invisibility cloaks and other photonic devices with higher transmission efficiency.
具有独特色散特性的双曲线超表面能够根据需求操控光与物质的相互作用。然而，由于其固有的物理性质，拓扑转变（平带）仅存在于正交方向，这极大地限制了它们的应用。在此，我们揭示了双曲线超表面中丰富的色散工程和拓扑转变。基于有效介质理论，将旋转矩阵引入色散关系，以解释新型扭曲超表面的能带图畸变、等频轮廓和高阶多偶极子，从而形成多方向拓扑转变和表面等离激元极化激元传播。此外，我们开发了一个集成模型来实现新型双通道负折射和无衍射负折射。实验中观察到的现象与模拟结果吻合良好，这证明所设计的超表面使新型负折射成为可能，并将有助于克服衍射极限。这里展示的双曲线超表面在设计具有分子水平超透镜的显微镜、军事飞机隐身、隐形斗篷以及其他具有更高传输效率的光子器件方面展现出卓越能力。
