Yang Fan, Lin Hung-I, Chen Peng, Hu Juejun, Gu Tian
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Department of Physics, Peking University, Beijing 100871, China.
Nanophotonics. 2023 Mar 28;12(14):2987-2996. doi: 10.1515/nanoph-2023-0088. eCollection 2023 Jul.
3-D depth sensing is essential for many applications ranging from consumer electronics to robotics. Passive depth sensing techniques based on a double-helix (DH) point-spread-function (PSF) feature high depth estimation precision, minimal power consumption, and reduced system complexity compared to active sensing methods. Here, we propose and experimentally implemented a polarization-multiplexed DH metalens designed using an autonomous direct search algorithm, which utilizes two contra-rotating DH PSFs encoded in orthogonal polarization states to enable monocular depth perception. Using a reconstruction algorithm that we developed, concurrent depth calculation and scene reconstruction with minimum distortion and high resolution in all three dimensions were demonstrated.
三维深度传感对于从消费电子到机器人技术等众多应用至关重要。与主动传感方法相比，基于双螺旋（DH）点扩散函数（PSF）的被动深度传感技术具有高深度估计精度、低功耗和降低系统复杂性的特点。在此，我们提出并通过实验实现了一种使用自主直接搜索算法设计的偏振复用DH超透镜，该算法利用编码在正交偏振态中的两个反向旋转的DH PSF来实现单目深度感知。使用我们开发的重建算法，展示了在所有三个维度上以最小失真和高分辨率进行并发深度计算和场景重建。
