Li Shiqing, Dong Shaohua, Yi Sixiong, Pan Weikang, Chen Yizhen, Guan Fuxin, Guo Huijie, Wang Zhuo, He Qiong, Zhou Lei, Sun Shulin
Opt Express. 2020 May 11;28(10):15601-15610. doi: 10.1364/OE.394658.
Manipulating circularly polarized (CP) light waves at will are highly important for photonic researches and applications. Recently, while Pancharatnam-Berry (PB) metasurfaces have shown unprecedented capabilities to control CP light, meta-devices constructed so far always suffer from the limitations of low-efficiency and narrow bandwidth. Here, we propose a scheme to construct PB metasurfaces with these two issues well addressed. To verify our idea, two PB meta-devices are designed and fabricated for achieving high-efficiency and broadband photonic spin Hall effect and focusing effect, respectively. Experimental results, in good agreement with full wave simulations, demonstrate the desired functionalities with efficiencies reaching 80% within an ultra-wide frequency band (8.2-17.3GHz). The proposed design scheme is generic and can be extended to high-frequency regimes. Our work can stimulate the realizations of high-performance and broadband PB meta-devices with diversified functionalities.
随意操纵圆偏振（CP）光波对光子学研究及应用极为重要。近来，尽管潘查拉特纳姆 - 贝里（PB）超表面展现出了前所未有的控制CP光的能力，但迄今为止构建的超表面器件一直受限于低效率和窄带宽。在此，我们提出一种方案来构建能很好解决这两个问题的PB超表面。为验证我们的想法，分别设计并制作了两个PB超表面器件，用于实现高效和宽带的光子自旋霍尔效应以及聚焦效应。实验结果与全波模拟结果高度吻合，证明了在超宽频带（8.2 - 17.3GHz）内效率达到80%时所需的功能。所提出的设计方案具有通用性，可扩展到高频领域。我们的工作能够推动具有多样化功能的高性能和宽带PB超表面器件的实现。
