太赫兹超分辨率成像评述I:非实时成像

作为太赫兹波最重要的应用之一,太赫兹成像技术在生物医疗、安防安检、无损检测和质量监控等方面都具有非常重要的应用前景。由于受衍射极限的限制,传统太赫兹成像技术的分辨率只能达到工作波长级别,还无法满足很多应用的需求。本文对几种非实时的太赫兹超分辨率成像手段进行了介绍,包括近场扫描显微成像、基于空间调制器的单探测器成像、基于时间反转的成像和基于空间频谱采样的成像,并对每一种成像手段的原理、发展过程及其优缺点进行了综述和讨论,最后对非实时太赫兹超分辨率成像的发展进行了展望。

Terahertz Super-Resolution Imaging I: Non-Real-Time Imaging

As one of the most important applications of terahertz waves, the terahertz imaging technology has a great application prospect in biomedical, security, non-destructive testing, quality monitoring and so on. Constrained by the diffraction limit, the resolution of conventional terahertz imaging technologies can only reach the wavelength level, which cannot meet the demands of many applications. The present paper systematically introduces serval non-real-time imaging methods that can beat the diffraction limit at terahertz wavelengths, including the near-field scanning optical imaging, the single-pixel imaging based on spatial modulators, the time reversal imaging and the imaging based on spatial spectrum sampling. The principle, development process, merits and limitations of each imaging method are reviewed and discussed in detail, and the future development of terahertz super-resolution imaging is prospected.