1 北京工业大学理学部物理与光电工程系，北京 100124
2 北京市精密测控技术与仪器工程技术研究中心，北京 100124
3 深圳大学物理与光电子工程学院，广东 深圳 518000
4 深圳市微纳光子信息技术重点实验室，广东 深圳 518000
太赫兹波作为一种穿透性强、具有非电离性和惧水性的电磁波，可以穿透多种非金属、非极性介质材料。太赫兹计算层析成像技术基于傅里叶中心切片定理和直线传播模型，通过记录不同投影角度下的强度数据，采用滤波反投影等重建算法获得样品三维吸收系数分布和内外部结构信息分布。随着太赫兹成像器件的不断发展和应用场景的拓展，已发展出多种照明模式、成像光路和重建算法，并已在文物保护、骨密度测量和无损检测领域开展了应用探索。概述太赫兹计算层析技术的基本原理，并从提高重建质量、分辨率和采集效率三方面具体介绍太赫兹计算层析成像技术的最新研究。
太赫兹成像 计算层析 三维成像 照明光场调控 激光与光电子学进展
2024, 61(2): 0211012
Author Affiliations
Abstract
1 Department of Physics and Optoelectronics Engineering, Faculty of Science, Beijing University of Technology, Beijing 100124, China
2 Beijing Engineering Research Center of Precision Measurement Technology and Instruments, Beijing 100124, China
The converging lens is one of the key components in high-resolution terahertz imaging. In this Letter, a binary diffractive lens is proposed for the scanning imaging system working at 278.6 GHz, in which a convergent beam with a waist diameter of 0.65 mm is generated, and 1 mm lateral imaging resolution is realized. This low-cost terahertz lens, constituted by concentric rings with different radii, is optimized by stimulated annealing algorithm and fabricated by three-dimensional printing. Compared with the conventional transmissive convex lens, higher resolution and enhanced imaging quality are achieved via smaller focal spot of the illumination beam. This type of lens would promote terahertz imaging closer to practical applications such as nondestructive testing and other scenarios.
terahertz imaging binary diffractive lens phase modulation three-dimensional printing Chinese Optics Letters
2023, 21(3): 030501
为实现全息图的准实时计算,提出了一种基于多图像处理单元(GPU)的Matlab计算机生成的全息图快速算法。该方法充分利用了Matlab编程的简易性和GPU的高计算性能,可有效节约全息图计算时间。模拟结果表明,所提方法的计算速度比传统计算方法提高了两个数量级。
全息 三维显示 准实时计算 图像处理单元 激光与光电子学进展
2019, 56(5): 050901
