近日，清华大学赵晓光团队通过机械可调混合级联超表面实现了双模激光雷达系统。这一研究成果于2025年8月25日发表在《光：科学与应用》杂志上。

光探测和测距（LiDAR）广泛应用于主动三维（3D）感知。波束扫描激光雷达在有限的探测效率下提供了高精度和较长的探测距离，而闪光激光雷达可以通过快照方式实现高效率的探测，但会降低精度和距离。

利用这些不同检测方法的协同作用，研究组通过级联Pancharatnam-Berry相位和传播相位超表面开发了一种小型化的双模可重构波束形成装置，并与微致动器集成。通过调制入射光的偏振，可以使器件的输出光束在光束阵列扫描模式和闪光照明模式之间切换。

在扫描模式下，该器件显示出连续可调的角分辨率和±35°视场（FoV）通过驱动微致动器实现±100 μm的横向平移。在闪光模式下，整个视场的均匀照明得以实现。作为概念验证，研究组提出了一种自适应3D重建方案，该方案利用设备切换操作模式和调整检测分辨率的能力。所提出的器件和检测方案共同构成了一个双模激光雷达系统，对各种环境具有很高的适应性。

附：英文原文

Title: A dual-mode LiDAR system enabled by mechanically tunable hybrid cascaded metasurfaces

Author: Zhang, Lingyun, Zhang, Chi, Zhang, Li, Yang, Jianing, Bian, Wei, You, Rui, Jing, Xiaoli, Xing, Fei, You, Zheng, Zhao, Xiaoguang

Issue&Volume: 2025-08-25

Abstract: Light detection and ranging (LiDAR) is widely used for active three-dimensional (3D) perception. Beam scanning LiDAR provides high accuracy and long detection range with limited detection efficiency, while flash LiDAR can achieve high-efficiency detection through the snapshot approach at the expense of reduced accuracy and range. With the synergy of these distinct detection approaches, we develop a miniaturized dual-mode, reconfigurable beam forming device by cascading Pancharatnam-Berry phase and propagation phase metasurfaces, integrated with a micro-actuator. By modulating incident light polarization, we can switch the output beam of the device between the beam array scanning mode and flash illuminating mode. In the scanning mode, the device demonstrates a continuously tunable angular resolution and a±35° field of view (FoV) through driving the micro-actuator to achieve the lateral translation of ±100μm. In the flash mode, uniform illumination across the entire FoV is achieved. As a proof of concept, we propose an adaptive 3D reconstruction scheme that leverages the device’s capability to switch operation modes and adjust detection resolution. Together, the proposed device and the detection scheme constitute a dual-mode LiDAR system, demonstrating high adaptability to diverse environment

DOI: 10.1038/s41377-025-01999-4

Source: https://www.nature.com/articles/s41377-025-01999-4