Metasurfaces, the 2D counterpart of artificial metamaterials, have attracted much attention because of their exceptional ability to manipulate the electromagnetic wave such as amplitude, phase, polarization, propagation direction, and so on. Different from conventional lenses, metalenses based on the metasurface optics are truly flat and compact and exhibit superior performance. In this report, recent progress in the development of metalenses is explored. First, the working principle and characteristics of metalenses are discussed. Then, it is described how the dispersion aberration in metalenses can be eliminated to make them suitable for being employed in a range of applications that are difficult or impossible for traditional lenses. In addition, various metalens‐based applications are introduced, including imaging, high spectral resolution spectroscopy, and multiplex color routing. Furthermore, a survey of reconfigurable and tunable metalenses is conducted. Finally, the report concludes by addressing future prospects of metalenses.

中文翻译：

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Metalenses：进展和应用

人造超材料的二维对应物超表面由于其具有出色的电磁波处理能力而备受关注，例如振幅，相位，极化，传播方向等。与传统的镜片不同，基于超表面光学元件的金属镜确实是平坦且紧凑的，并具有出众的性能。在本报告中，探讨了金属传感的最新进展。首先，讨论了金属传感的工作原理和特点。然后，描述了如何消除金属镜中的色散像差以使其适合于在传统镜片难以或不可能的各种应用中使用。此外，还引入了各种基于金属元素的应用，包括成像，高光谱分辨率光谱学和多路复用色彩路由。此外，对可重构和可调金属感进行了调查。最后，报告总结了金属元素的未来前景。