Hu Hao, Lin Wenqing, Ma Xinru, Hu Xiaoxue, Wang Xiaolei
Opt Express. 2024 Jan 29;32(3):4111-4121. doi: 10.1364/OE.511757.
This article presents a terahertz (THz) fast line-scanning imaging system with three-dimensional (3-D) focus-steering capability operating at 0.1 THz. The system comprises a 3-D printed rotating multi-prism plate and a dual-device structure consisting of a negative ridge pyramid and a column ridge pyramid. The simulation and experimental results demonstrate that the system generates a sheet-shaped diffraction-free beam with a projection distance of approximately 175 mm and a diffraction-free distance of approximately 200 mm. Moreover, the system maintains a resolution greater than 4 mm within the diffraction-free range. Furthermore, the proposed THz lens-less line-scanning imaging system enables 3-D scanning imaging within a set range of ±22°. The proposed approach can be extended to cover other frequencies within the THz range by appropriately adjusting the parameters. The system has the advantages of long working distance and long depth of field, making it a very attractive candidate for low-cost, easy-fabrication, and easy-adjustment solutions for the next generation of THz fast detection and imaging technology.
本文介绍了一种太赫兹（THz）快速线扫描成像系统，该系统具有三维（3-D）聚焦转向能力，工作频率为0.1太赫兹。该系统包括一个3-D打印的旋转多棱镜板和一个由负脊金字塔和柱脊金字塔组成的双器件结构。仿真和实验结果表明，该系统产生了一个片状无衍射光束，投影距离约为175毫米，无衍射距离约为200毫米。此外，该系统在无衍射范围内保持大于4毫米的分辨率。此外，所提出的太赫兹无透镜线扫描成像系统能够在±22°的设定范围内进行三维扫描成像。通过适当调整参数，所提出的方法可以扩展到覆盖太赫兹范围内的其他频率。该系统具有工作距离长和景深的优点，使其成为下一代太赫兹快速检测和成像技术低成本、易于制造和易于调整解决方案的极具吸引力的候选方案。
