Zhao Jie, Yang Xi, Dai Jun Yan, Cheng Qiang, Li Xiang, Qi Ning Hua, Ke Jun Chen, Bai Guo Dong, Liu Shuo, Jin Shi, Alù Andrea, Cui Tie Jun
State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China.
National Mobile Communication Research Laboratory, Southeast University, Nanjing 210096, China.
Natl Sci Rev. 2019 Mar;6(2):231-238. doi: 10.1093/nsr/nwy135. Epub 2018 Nov 15.
Optical non-linear phenomena are typically observed in natural materials interacting with light at high intensities, and they benefit a diverse range of applications from communication to sensing. However, controlling harmonic conversion with high efficiency and flexibility remains a major issue in modern optical and radio-frequency systems. Here, we introduce a dynamic time-domain digital-coding metasurface that enables efficient manipulation of spectral harmonic distribution. By dynamically modulating the local phase of the surface reflectivity, we achieve accurate control of different harmonics in a highly programmable and dynamic fashion, enabling unusual responses, such as velocity illusion. As a relevant application, we propose and realize a novel architecture for wireless communication systems based on the time-domain digital-coding metasurface, which largely simplifies the architecture of modern communication systems, at the same time yielding excellent performance for real-time signal transmission. The presented work, from new concept to new system, opens new pathways in the application of metamaterials to practical technology.
光学非线性现象通常在与高强度光相互作用的天然材料中观察到，它们在从通信到传感的各种应用中都有好处。然而，在现代光学和射频系统中，高效且灵活地控制谐波转换仍然是一个主要问题。在此，我们介绍一种动态时域数字编码超表面，它能够有效操纵光谱谐波分布。通过动态调制表面反射率的局部相位，我们以高度可编程和动态的方式实现了对不同谐波的精确控制，从而实现了诸如速度错觉等异常响应。作为一个相关应用，我们提出并实现了一种基于时域数字编码超表面的无线通信系统新颖架构，该架构大大简化了现代通信系统的架构，同时在实时信号传输方面产生了优异的性能。所展示的工作，从新概念到新系统，为超材料在实际技术中的应用开辟了新途径。
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