太赫兹近场成像技术及进展

Terahertz near-field imaging technology and its development

摘要:

太赫兹(THz)波具有能量低、穿透性强、频带宽等特点，因而太赫兹成像技术在无损检测、生物医药、安全检测等众多领域得到了广泛应用，在实际应用中如何提高太赫兹成像的分辨力变得越来越重要。由于太赫兹近场成像技术可突破衍射极限，获得分辨力为亚微米甚至是纳米量级的高质量图像，基于近场技术的高分辨THz成像技术相继被提出，并得到了进一步的应用。本文首先阐述了太赫兹近场成像的基本原理；其次总结了近场成像进展及增强方法；最后对太赫兹近场成像的未来进行了展望。

Abstract:

Because terahertz(THz) waves have the characteristics of low energy, strong penetration, and broad bandwidth, terahertz imaging technology has been widely used in many fields such as non-destructive testing, biomedicine, and safety testing. How to improve the resolution of terahertz imaging in practical applications is becoming more and more important. Terahertz near-field imaging technology can break through the diffraction limit and obtain high-quality images with submicron or even nanometer resolution, thus high-resolution THz imaging technologies based on near-field methods have been proposed and further applied. This article first describes the basic principles of terahertz near-field imaging; secondly, summarizes its progresses and enhancement methods; and finally prospect the future of terahertz near-field imaging.