Ultra-Broadband High-Efficiency Airy Optical Beams Generated with All-Silicon Metasurfaces
Ultra-Broadband High-Efficiency Airy Optical Beams Generated with All-Silicon Metasurfaces
复制标题
使用全硅超表面生成超宽带高效率艾里光束
DOI：
10.1002/adom.202001284
复制
发表时间：
2020-10-29
影响因子：
9
通讯作者：
Chen, Lin
中科院分区：
文献类型：
--
作者：
Ju, Zezhao;Wen, Jing;Chen, Lin
用于产生艾里光束的常规方法依赖于庞大且昂贵的系统，这阻碍了光学系统的小型化。超颖表面提供了一种紧凑的方法来生成艾里光束，但是当前的方案遭受窄带宽和/或低传输效率的问题。本文提出了一种利用介质超颖表面的高双折射和高透射效率来构造宽带高效透射型艾里光束发生器的设计策略。通过控制硅纳米柱的取向角，可以同时调制透射光的局部振幅和相位以满足Airy函数，而与入射波长无关。实验结果表明，该装置具有1.1 ~ 1.7 μ m的超宽工作带宽。实验还证明了艾里光束具有无衍射、自加速和自修复等显著特性。这些结果可能为基于超表面的艾里光束的实际设备和应用提供可行的机会。
Conventional approaches for generating Airy beams rely upon bulky and costly systems, which impede the miniaturization of optical systems. Metasurfaces have provided a compact method to generate Airy optical beams, but the current schemes suffer from the issues of narrow bandwidths and/or low transmission efficiencies. Here, a design strategy of constructing broadband and high-efficiency transmissive Airy optical beam generator by taking advantages of the high birefringence and transmission efficiency of dielectric metasurfaces is proposed. The local amplitude and phase of transmitted light can be simultaneously modulated to satisfy the Airy function by controlling the orientation angles of silicon nano-pillars, regardless of the incidence wavelength. The resultant Airy beam generator is experimentally verified within an ultra-wide operation bandwidth from 1.1 to 1.7 mu m. The remarkable diffraction-free, self-accelerating, and self-healing properties of Airy beams are also demonstrated. The results may power up viable opportunities for practical devices and applications of metasurface-based Airy beams.