新型功能超颖表面波前调制技术的发展与应用(特邀)

超颖表面作为一类智能表面，通常由特殊设计、加工而得到的特征尺寸接近或小于波长的亚波长纳米天线阵列构成。超颖表面能够实现光场的振幅、相位和偏振的人为调控，具有超薄、超小像素、宽带、低损耗、易加工等优势，设计灵活，功能强大。文中针对超颖表面在全息显示、波前调制和偏振转换、主动可调、非线性波前调控等方向进行综述，并展望未来发展趋势。超颖表面作为一种超薄的、微型化的波前调制器件，具有极大的信息容量，且更能适应未来高度集成的微型光电系统的发展要求，在全息显示、光束整形、涡旋光束的产生、数据存储、加密与防伪、超透镜与色散控制、彩色印刷、非对称传输、非线性光学、光的自旋霍尔效应、光通信与集成光电子学等应用领域提供了潜在的可行性和新的视角，有望取代传统光电器件，展现出了广阔的发展前景。

Development and applications of wavefront modulation technology based on new functional metasurfaces(Invited)

As a kind of smart surface, metasurfaces are usually composed of sub-wavelength nano-antenna arrays which are specially designed and processed with characteristic sizes close to or less than their working wavelengths. Metasurfaces can arbitrarily modulate the amplitude, phase and polarization of the light field. It has the advantages of ultra-thinness, ultra-small pixels, broadband, low loss, easy processing, flexible design and great functionality. This paper reviews the research progress of metasurfaces in holographic display, wavefront modulation and polarization conversion, active tunable, nonlinear wavefront modulation, and looks forward to the future development trend of metasurfaces. As an ultra-thin and miniaturized wavefront modulation device, metasurfaces have great information capacity and are more suitable for the future development of highly integrated micro optoelectronic systems. Metasurfaces provide potential feasibility and new perspectives for a plethora of applications such as holographic display, beam shaping, vortex beam generation, data storage, encryption and anti-counterfeiting, metalens and dispersion control, color printing, asymmetric transmission, nonlinear optics, the spin-Hall effect of light, optical communication, integrated optoelectronics. They are expected to replace the traditional optoelectronic devices and show broad prospects for future development.