AI 中文总结
该研究针对高分辨率宽视场成像的传统权衡问题，开发了全固态级联液晶光束偏转系统，实现30.3°×30.3°视场覆盖，空间带宽积提升8.6倍，可用于移动车辆高分辨率跟踪。
AI 中文摘要
高分辨率宽视场成像是需要同时实现全局覆盖与局部细节的应用所必需的，但传统方法面临根本权衡：宽视场（FOV）相机通过将有限的探测器像素分布在宽角范围内，牺牲了空间采样密度；而长焦系统虽能解析精细特征，却以场景覆盖为代价。光束偏转装置可缓解这一权衡，但目前难以同时实现全固态、大孔径和高速运行。本文报道了一种全固态大孔径级联液晶光束偏转（CaLiBS）成像系统，该系统通过电偏转子视场，扩展了高分辨率窄视场相机的有效角范围。CaLiBS模块由级联液晶波片和液晶潘查拉坦姆-贝里相位光栅组成；带有分层搜索算法的理论电压预测模型可实现斜入射下的高效校准，校准速度比传统方法快10倍。经校准的系统以2°的间隔覆盖30.3°×30.3°范围内的子视场，衍射效率高于60%。连续采集子视场可重构出34.7×34.7的合成图像，与使用同一探测器的单次曝光宽视场相机相比，空间带宽积提升了8.6倍。结合目标跟踪方法，子视场切换还能实现广域场景内移动车辆的高分辨率跟踪。这种级联液晶架构为实现紧凑、无振动、高分辨率的宽视场观测提供了可扩展的途径。
英文摘要
High-resolution wide-field imaging is essential for applications requiring simultaneous global coverage and local detail, yet conventional approaches face a fundamental trade-off: wide-FOV cameras sacrifice spatial sampling density by distributing finite detector pixels over a broad angular range, while telephoto systems resolve fine features at the cost of scene coverage. Beam-steering devices can mitigate this trade-off but are currently limited in achieving simultaneously all-solid-state, large aperture, and high-speed operation. Here, we report an all-solid-state large-aperture cascaded liquid-crystal beam-steering (CaLiBS) imaging system that extends the effective angular range of a high-resolution narrow-FOV camera by electrically steering sub-FOVs. The CaLiBS module comprises cascaded liquid crystal waveplates and liquid crystal Pancharatnam-Berry phase gratings; a theoretical voltage-prediction model with a hierarchical search algorithm enables efficient calibration under oblique incidence and 10 times faster calibration speed compared with conventional methods. The calibrated system addresses sub-FOVs across 30.3° * 30.3° at 2° intervals with diffraction efficiency above 60%. Sequential sub-FOV acquisition reconstructs a 34.7 * 34.7 composite image, an 8.6-fold enhancement in spatial-bandwidth product over a single-shot wide-FOV camera using the same detector. Combined with object tracking methods, sub-FOV switching further enables high-resolution tracking of moving vehicles within the wide-area scene. This cascaded LC architecture offers a scalable pathway toward compact, vibration-free, and high-resolution wide-field observation.
Comments42 pages, 13 figures
