基于电介质超表面的光场复振幅调制及应用

超表面作为一种人工设计的二维阵列纳米结构，能够在亚波长尺度上实现光场波前振幅、相位和偏振态的灵活调控，为现代光学器件的小型化、集成化提供了全新的实现途径。随着光学成像、显示等应用的发展，在可见光波段具有高工作效率的微型光学器件的需求日益凸显。近年来，由高折射率、低损耗电介质材料制备的光学超表面得到了极大地发展，在消色差光学超透镜、偏振相关全息显示等方面展现出广泛的应用前景。文中围绕电介质超表面的相关研究，首先介绍广义斯涅耳定律及电介质超表面结构调控光场振幅、相位和偏振态的基本原理，在此基础上，重点回顾近年来关于光场波前单一参量调控和多参量联合调控在全息显示、结构光场产生等方面的研究进展，最后讨论电介质超表面发展的可能挑战与前景。

Complex amplitude modulation of light fields based on dielectric metasurfaces and its applications

Metasurface is an artificially ultrathin material with two-dimensional nanostructure array, which can achieve flexible modulation on amplitude, phase and polarization of light field in a sub-wavelength scale, providing a new possibility for the miniaturization and integration of modern optical devices. With the development of optical imaging, display and so on, the requirement of miniaturized optical devices with high efficiency in visible light band is becoming conspicuous. In recent years, optical metasurfaces fabricated by dielectric materials with high refractive indices and low losses have been extensively studied, showing application prospects in achromatic metalens, polarization-dependent holographic display, et al. Around the research on the metasurface of dielectric, firstly, the generalized Snell's law and the modulation principle of nanostructures in dielectric metasurface on amplitude, phase and polarization of light field were introduced. Then the research progress of dielectric metasurfaces in holographic display and structural light field generation, based on single- and multi-parameters modulation of light field was reviewed. At last, the possible challenges and prospects of dielectric metasurfaces were discussed.