Bi Fan, Ba Zhongling, Wang Xiong
Opt Express. 2018 Oct 1;26(20):25693-25705. doi: 10.1364/OE.26.025693.
Orbital angular momentum (OAM) is an intrinsic property that all electromagnetic waves can carry. Interesting properties of OAM beams have enabled many novel applications. But broadband OAM generator has rarely been investigated, especially in the millimeter wave frequency band. In this work, a broadband OAM generator applying a metallic reflective metasurface operating from 59 to 70 GHz is designed, simulated, fabricated and measured. Both simulation and experiment results demonstrate that broadband millimeter wave OAM beams with good quality can be reliably launched by the designed metasurface. The proposed broadband OAM generator alleviates malfunctions caused by dispersion and provides new possibilities of multiplexing for millimeter wave communication applications.
轨道角动量（OAM）是所有电磁波都能携带的一种固有属性。OAM光束的有趣特性促成了许多新颖的应用。但宽带OAM发生器很少被研究，尤其是在毫米波频段。在这项工作中，设计、模拟、制作并测量了一种应用金属反射超表面、工作频率为59至70GHz的宽带OAM发生器。仿真和实验结果均表明，所设计的超表面能够可靠地发射出高质量的宽带毫米波OAM光束。所提出的宽带OAM发生器减轻了色散引起的故障，并为毫米波通信应用提供了复用的新可能性。
