Luo XianGang, Zhang Fei, Pu MingBo, Guo YingHui, Li Xiong, Ma XiaoLiang
State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics Chinese Academy of Sciences, Chengdu 610209, China.
School of Optoelectronics, University of Chinese Academy of Sciences, Beijing 100049, China.
Nanophotonics. 2021 Dec 2;11(1):1-20. doi: 10.1515/nanoph-2021-0583. eCollection 2022 Jan.
Optical imaging systems, like microscopes, cameras, and telescopes, continue to expand the scope of human observation of the world. As one of the key indicators of imaging systems, the field-of-view (FOV) is often limited by coma aberration. Expanding it generally relies on a combination of complex lenses, leading to a bulky and cumbersome system. Recently, the emergency of meta-optics provides an alternative to constructing compact and lightweight large-FOV metalens through elaborated phase modulation within a flat surface, showing great potential in surveillance, unmanned vehicles, onboard planes or satellites, medical science, and other new applications. In this article, we review recent advances of wide-angle metalenses, including operation principles, design strategies, and application demos. Firstly, basic principles of wide-angle imaging using a single metalens are interpreted. Secondly, some advanced methods for designing subwavelength structures with high angle robustness and high efficiency are discussed. Thirdly, some representative functional devices and applications are surveyed. Finally, we conclude with an outlook on future potentials and challenges that need to be overcome.
光学成像系统，如显微镜、相机和望远镜，不断拓展着人类观察世界的范围。作为成像系统的关键指标之一，视场（FOV）常常受到彗差的限制。扩大视场通常依赖于复杂透镜的组合，这会导致系统体积庞大且笨重。近来，超光学的出现提供了一种替代方案，可通过在平面内进行精细的相位调制来构建紧凑且轻便的大视场超透镜，在监视、无人驾驶车辆、机载飞机或卫星、医学以及其他新应用领域展现出巨大潜力。在本文中，我们综述了广角超透镜的最新进展，包括工作原理、设计策略和应用演示。首先，阐释了使用单个超透镜进行广角成像的基本原理。其次，讨论了一些用于设计具有高角度鲁棒性和高效率的亚波长结构的先进方法。第三，考察了一些具有代表性的功能器件和应用。最后，我们对未来的潜力和需要克服的挑战进行了展望并得出结论。
