Shang Guanyu, Hu Guangwei, Guan Chunsheng, Wang Yue, Zhang Kuang, Wu Qun, Liu Jian, Ding Xue-Mei, Burokur Shah Nawaz, Li Haoyu, Ding Xumin, Qiu Cheng-Wei
Advanced Microscopy and Instrumentation Research Center, Harbin Institute of Technology, Harbin 150080, China.
Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore.
Nanophotonics. 2022 Aug 5;11(16):3729-3739. doi: 10.1515/nanoph-2022-0292. eCollection 2022 Sep.
Metasurfaces have attracted broad interest thanks to their unprecedented capacity for electromagnetic wavefront manipulation. The compact, ultrathin and multifunctional metasurface calls for novel design principles. Here, we propose and experimentally demonstrate a non-interleaved and non-segmented bidirectional Janus metasurface that encodes multiple functionalities in full-space scattering channels with different propagation directions and polarization in the microwave region. Specifically, by rotating and adjusting the elementary double-arrow-shaped structure within the same meta-atom, the independent phase control can be achieved in both cross-polarized transmission and co-polarized reflection components under oppositely directed incident waves. Our metasurface with broken mirror symmetry can fully exploit four independent information channels under opposite propagation directions. A series of proof-of-concept is constructed to validity of our methodology, and the simulations and experimental results further show that the proposed non-interleaved bidirectional metasurface can provide an attractive platform for various applications, ranging from structured light conversion, optical imaging, multifunctional optical information processing and others.
超表面因其前所未有的电磁波前操纵能力而引起了广泛关注。紧凑、超薄且多功能的超表面需要新颖的设计原理。在此，我们提出并通过实验证明了一种非交错且非分段的双向贾纳斯超表面，它在微波区域的具有不同传播方向和极化的全空间散射通道中编码多种功能。具体而言，通过在同一超原子内旋转和调整基本双箭头形状结构，可以在相反方向入射波下的交叉极化传输和共极化反射分量中实现独立的相位控制。我们具有破镜面对称性的超表面可以在相反传播方向下充分利用四个独立的信息通道。构建了一系列概念验证来验证我们方法的有效性，模拟和实验结果进一步表明，所提出的非交错双向超表面可以为从结构光转换、光学成像、多功能光学信息处理等各种应用提供一个有吸引力的平台。
