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Demonstration of Orbital Angular Momentum Multiplexing and Demultiplexing Based on a Metasurface in the Terahertz Band
ACS Photonics ( IF 6.5 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acsphotonics.7b01149 Huan Zhao 1 , Baogang Quan 2 , Xinke Wang 1 , Changzhi Gu 2 , Junjie Li 2 , Yan Zhang 1
ACS Photonics ( IF 6.5 ) Pub Date : 2017-11-07 00:00:00 , DOI: 10.1021/acsphotonics.7b01149 Huan Zhao 1 , Baogang Quan 2 , Xinke Wang 1 , Changzhi Gu 2 , Junjie Li 2 , Yan Zhang 1
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Orbital angular momentum of light (OAM) is attracting increasing attention in conjunction with the continuing development of high-speed optical communications. The unlimited nature of OAM allows its multiple degrees of freedom to be used in communications applications. In the OAM multiplexing technique, different OAMs provide independent channels to carry and deliver different data. An OAM multiplexing scheme in the terahertz (THz) band based on use of a single-layer metasurface is demonstrated numerically and experimentally in this work. The designed structure generates four focused phase vortex beams that have different topological charges under illumination by a Gaussian beam, which means that OAM multiplexing with four channels is realized. When an individual vortex beam is used as the incident light, only one channel is identified and extracted as a focal spot; that is, demultiplexing of the OAM signal is achieved. The structure has subwavelength-level thickness, which enriches the number of potential approaches available for the miniaturization and integration of THz communication systems. The performance of the designed OAM multiplexing and demultiplexing device shows excellent agreement between the theoretical predictions and experimental results, thus indicating that this device is suitable for ultrahigh-speed THz communications.
中文翻译：
基于太赫兹带超表面的轨道角动量多路复用和多路分离的演示
随着高速光通信的不断发展，光轨道角动量（OAM）受到越来越多的关注。OAM的无限性质允许其多个自由度可用于通信应用程序。在OAM复用技术中，不同的OAM提供独立的通道来承载和传递不同的数据。在这项工作中，在数字上和实验上演示了基于使用单层超颖表面的太赫兹（THz）频带中的OAM复用方案。设计的结构在高斯光束的照射下产生四个具有不同拓扑电荷的聚焦相位涡旋光束，这意味着可以实现四个通道的OAM多路复用。当单个涡旋光束用作入射光时，仅识别并提取了一个频道作为重点；即，实现了OAM信号的解复用。该结构具有亚波长级的厚度，这丰富了可用于THz通信系统的小型化和集成的潜在方法的数量。设计的OAM多路复用和多路分解设备的性能在理论预测和实验结果之间显示出极好的一致性，从而表明该设备适用于超高速THz通信。
更新日期：2017-11-07
中文翻译：
基于太赫兹带超表面的轨道角动量多路复用和多路分离的演示
随着高速光通信的不断发展，光轨道角动量（OAM）受到越来越多的关注。OAM的无限性质允许其多个自由度可用于通信应用程序。在OAM复用技术中，不同的OAM提供独立的通道来承载和传递不同的数据。在这项工作中，在数字上和实验上演示了基于使用单层超颖表面的太赫兹（THz）频带中的OAM复用方案。设计的结构在高斯光束的照射下产生四个具有不同拓扑电荷的聚焦相位涡旋光束，这意味着可以实现四个通道的OAM多路复用。当单个涡旋光束用作入射光时，仅识别并提取了一个频道作为重点；即，实现了OAM信号的解复用。该结构具有亚波长级的厚度，这丰富了可用于THz通信系统的小型化和集成的潜在方法的数量。设计的OAM多路复用和多路分解设备的性能在理论预测和实验结果之间显示出极好的一致性，从而表明该设备适用于超高速THz通信。
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