(Peer-Reviewed) Breaking the speed-resolution trade-off in 3.3-km non-line-of-sight imaging using scanning-free laser reflective tomography
Zewei Wang 王泽威 ¹ ² ³, Xiaoyin Li 李晓银 ¹ ², Yinghui Guo 郭迎辉 ¹ ² ³ ⁴, Hengshuo Guo 郭珩硕 ⁵, Peng Yang 杨鹏 ¹ ² ³, Fei Zhang 张飞 ¹ ² ³, Mingbo Pu 蒲明博 ¹ ² ³, Mingfeng Xu 徐明峰 ¹ ² ³, Xiangang Luo 罗先刚 ¹ ² ³
¹ State Key Laboratory of Optical Field Manipulation Science and Technology, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
中国 成都 中国科学院光电技术研究所 光场调控科学技术全国重点实验室
² Research Center on Vector Optical Fields, Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China
中国 成都 中国科学院光电技术研究所矢量光场研究中心
³ College of Materials Sciences and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China
中国 北京 中国科学院大学材料科学与光电技术学院
⁴ Sichuan Provincial Engineering Research Center of Digital Materials, Chengdu 610299, China
中国 成都 四川省数字材料工程研究中心
⁵ Tianfu Xinglong Lake Laboratory, Chengdu 610299, China
中国 成都 天府兴隆湖实验室
Opto-Electronic Science, 2026-06-17
Abstract
Non-line-of-sight (NLOS) imaging, which allows the recovery of hidden scenes outside the direct view, holds immense potential across numerous fields. However, conventional scanning-based NLOS imaging systems, face a fundamental trade-off between imaging speed and resolution due to their reliance on scanning relay surfaces, where dense sampling prolongs measurement.
Here, we introduce a scanning-free NLOS imaging technique that adapts laser reflective tomography (LRT) to reconstruct hidden objects by exploiting the diffuse relay surface as a natural beam expander. Our method requires only single-point detection of third-bounce photons, effectively breaking through the resolution and speed limitations imposed by scanning. Compared with scanning-based approaches, it delivers a twofold enhancement in spatial resolution and a 91-fold improvement in imaging speed.
Furthermore, we extend the advantages of this method to long-range experiments, demonstrating NLOS imaging over 3.3 km with a resolution of 3 cm in 3 minutes, establishing new benchmarks in imaging range, resolution, and speed for NLOS imaging.
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