Highly Tunable Cascaded Metasurfaces for Continuous Two‐Dimensional Beam Steering

• DOI: 10.1002/advs.202300542
• Publication Date: 2023-06-21T00:25:25Z
• Authors: Lingyun Zhang; Li Zhang; Rongbo Xie; Yibo Ni; Xiaoyu Wu; Yuanmu Yang; Fei Xing; Xiaoguang Zhao; Zheng You
• Keywords: Beam steering; Beam divergence

Abstract Cascaded metasurfaces can exhibit powerful dynamic light manipulation by mechanically tuning the far‐field interactions in layers. However, most current designs, are separated gaps smaller than a wavelength to form total phase profile, representing direct accumulation of profiles each layer. Such small gap sizes may not only conflict with conditions but also pose great difficulties for practical implementations. To overcome this limitation, design paradigm taking advantage ray‐tracing scheme that allows cascaded operate optimally at easily achievable is proposed. Enabled relative lateral translation two metasurfaces, continuous two‐dimensional (2D) beam‐steering device 1064 nm designed as proof concept. Simulation results demonstrate ranges ±45° biaxial deflection angles within ±3.5 mm translations, while keeping divergence deflected less 0.007°. The experimental agree well theoretical predictions, and uniform optical efficiency observed. generializeddesign pave way towards myriad tunable metasurface devices various applications, including limited detection ranging (LiDAR) free space communication.