Zhang Zhanyi, Liang Haigang, He Tao, Wang Zhanshan, Cheng Xinbin
Appl Opt. 2020 Feb 10;59(5):A63-A68. doi: 10.1364/AO.59.000A63.
Through the introduction of a broadband (∼1µ) high-efficiency (average above 90%) half-wave plate in the near-infrared (NIR) region, reflective Pancharatnam-Berry metasurfaces that can generate high-intensity (above 90%) left-circular polarization (LCP) and right-circular polarization (RCP) light for broadband (∼900) are designed. It provides a method to generate broadband high-efficiency circularly polarized (CP) light, which is a rare complex process in traditional chiroptical spectroscopy. To further show the broadband high-efficiency function of the meta-atom, a broadband high-efficiency reflective vortex beam generator based on metasurfaces is designed for RCP light in the NIR region. Moreover, with the appropriate arrangement, the metasurfaces are able to focus the vortex beam into a point to increase the intensity of the generated vortex beam.
通过在近红外（NIR）区域引入宽带（约1µ）高效（平均高于90%）半波片，设计了能够为宽带（约900）产生高强度（高于90%）左旋圆偏振（LCP）和右旋圆偏振（RCP）光的反射型潘查拉特纳姆-贝里超表面。它提供了一种产生宽带高效圆偏振（CP）光的方法，这在传统手性光学光谱中是一个罕见的复杂过程。为了进一步展示超原子的宽带高效功能，设计了一种基于超表面的近红外区域RCP光宽带高效反射涡旋光束发生器。此外，通过适当的排列，超表面能够将涡旋光束聚焦到一个点上，以增加所产生涡旋光束的强度。
