Wang Zhenxu, Liu Tonghao, Liang Jian-Gang, Wang Jiafu, Meng Yueyu, Fu Xinmin, Chen Hongya, Zhu Ruichao, Chu Zuntian, Cui Yina, Sun Huiting, Wang Shaojie, Ma Hua, Qu Shaobo
Shaanxi Key Laboratory of Artificially-Structured Functional Materials and Devices, Air Force Engineering University, Xi'an, Shaanxi 710051, China.
Air and Missile Defense College, Air Force Engineering University, Xi'an, Shaanxi 710051, People's Republic of China.
Nanophotonics. 2024 Feb 23;13(6):915-926. doi: 10.1515/nanoph-2023-0820. eCollection 2024 Mar.
Flexible manipulation of surface waves (SWs) radiation has been continuously intriguing enormous interests of researchers due to its promising application prospects, and metasurfaces exhibit unparalleled capability to efficiently control SWs radiation. However, existing schemes still suffer from the bottlenecks of single radiation channel and immutable radiation pattern, which are difficult to satisfy the requirements of high-integration intelligent metadevices. Herein, an ingenious strategy of the SWs radiation metadevice is proposed to independently and dynamically manipulate SWs directional radiation in four polarization channels. The waveguide port and the guided wave structure are designed to excite and propagate the desired SWs, and the programmable coding metasurface can independently convert SWs into -polarized radiation waves, -polarized radiation waves, left-handed circular polarized radiation waves and right-handed circular polarized radiation waves and dynamically control the corresponding radiation angles by adjusting the ON/OFF states of two positive-intrinsic-negative diodes in each spin-decoupled meta-atom. Numerous simulation and experimental results of the proof-of-concept prototype are in good agreement with the theoretical predictions, which verify the feasibility of our proposed methodology. The innovative design of four-channel SWs radiation metadevice with high radiation efficiency and broad radiation bandwidth offers an excellent platform for flexibly manipulating SWs radiation, and possesses tremendous potential in engineering application.
由于其广阔的应用前景，表面波（SWs）辐射的灵活操控一直吸引着研究人员的极大兴趣，而超表面展现出了高效控制SWs辐射的无与伦比的能力。然而，现有的方案仍然受制于单一辐射通道和固定辐射模式的瓶颈，难以满足高集成度智能超器件的要求。在此，提出了一种SWs辐射超器件的巧妙策略，以在四个极化通道中独立且动态地操控SWs定向辐射。波导端口和导波结构被设计用于激发和传播所需的SWs，而可编程编码超表面能够独立地将SWs转换为x极化辐射波、y极化辐射波、左旋圆极化辐射波和右旋圆极化辐射波，并通过调整每个自旋解耦超原子中两个正-本征-负二极管的开/关状态来动态控制相应的辐射角度。概念验证原型的大量仿真和实验结果与理论预测高度吻合，验证了我们所提出方法的可行性。具有高辐射效率和宽辐射带宽的四通道SWs辐射超器件的创新设计为灵活操控SWs辐射提供了一个出色的平台，并且在工程应用中具有巨大潜力。
