Xiao Qiang, Ma Qian, Ning Yu Ming, Chen Long, Liu Shuo, Zhang Jingjing, You Jian Wei, Cui Tie Jun
Institute of Electromagnetic Space, Southeast University, Nanjing 210096, China.
State Key Laboratory of Millimeter Wave, Southeast University, Nanjing 210096, China.
Nanophotonics. 2024 Jan 8;13(12):2141-2149. doi: 10.1515/nanoph-2023-0490. eCollection 2024 May.
We propose a programmable topological metasurface to integrate intelligent modulations of spatial and surface waves. A general design method is presented to design the programmable metasurface elements with PIN diodes. The surface waves can be controlled to propagate along the topological domain-wall interface by programming the C-symmetry elements, while the spatial waves are modulated by the patterns of C-symmetry elements. By independently controlling the bias voltages of meta-elements, the programmable topological metasurface can generate different coding patterns with distinct combinations of C- and C-symmetries in real time, respectively achieving the dynamical manipulation of the surface- and spatial-wave by using distinct element states in a time-division manner. To validate the modulation performance, we perform both near- and far-field tests with different coding patterns. Experimental results demonstrate good agreement with numerical simulations, thereby showcasing the flexible manipulations of surface waves and spatial waves by the topological metasurface. The proposed metasurface opens up new possibilities for multifunctional metadevices, which hold great potentials for future wireless communications and smart sensing systems.
我们提出了一种可编程拓扑超表面，以集成空间波和表面波的智能调制。提出了一种通用设计方法，用于设计带有PIN二极管的可编程超表面元件。通过对具有C对称性的元件进行编程，可控制表面波沿着拓扑畴壁界面传播，而空间波则由具有C对称性的元件图案进行调制。通过独立控制超表面元件的偏置电压，可编程拓扑超表面可分别实时生成具有不同C对称和C反对称组合的不同编码图案，通过时分方式使用不同的元件状态分别实现对表面波和空间波的动态操纵。为了验证调制性能，我们使用不同的编码图案进行了近场和远场测试。实验结果与数值模拟结果吻合良好，从而展示了拓扑超表面对表面波和空间波的灵活操纵。所提出的超表面为多功能超器件开辟了新的可能性，在未来无线通信和智能传感系统中具有巨大潜力。
