Wang Cong, Li Xiangteng, Chu Hongchen, Liu Baiyang, Miao Shenhao, Peng Ruwen, Wang Mu, Lai Yun
National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.
Department of Electronics and Electrical Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Nanophotonics. 2024 Jan 9;13(12):2151-2159. doi: 10.1515/nanoph-2023-0635. eCollection 2024 May.
We introduce a programmable flip-metasurface that can dynamically control the reflection while leaving the transmitted wavefront undistorted in an ultra-broad spectrum, i.e., the same as that of the incidence. This metasurface is constructed by unique meta-atoms that can be dynamically switched between two flip states, which correspond to the spatial inversion of each other. Due to the reciprocity principle and spatial inversion symmetry, the transmission is independent of the flip states, regardless of the frequency. While the reflection can be conveniently controlled by tuning the flip states. Dynamical steering of the reflected waves, such as diffuse reflection, focusing, and beam-splitting, is numerically and experimentally validated along with unaffected transmission. Our finding opens an approach to dynamically modulate reflections without affecting transmission, which could have broad potential applications ranging from wireless communications to stealth technology.
我们介绍了一种可编程的翻转超表面，它能够在超宽频谱内动态控制反射，同时保持透射波前不受干扰，即与入射波前相同。这种超表面由独特的超原子构成，这些超原子能够在两种相互对应的翻转状态之间动态切换，这两种状态彼此空间反转。由于互易原理和空间反演对称性，无论频率如何，透射都与翻转状态无关。而反射则可以通过调整翻转状态方便地进行控制。反射波的动态转向，如漫反射、聚焦和分束，在数值和实验上都得到了验证，同时透射不受影响。我们的发现开辟了一种在不影响透射的情况下动态调制反射的方法，这在从无线通信到隐身技术等广泛领域可能具有潜在应用。
