设计并搭建了太赫兹光致力显微成像系统(THz PiFM)，首次在太赫兹波段实现了近场光力纳米显微成像测量。该系统基于原子力显微镜，利用探针对所受力的灵敏检测能力，通过探测探针与样品之间近场偶极相互作用产生的光场梯度力，实现无探测器的太赫兹近场显微成像。利用该系统，对可见光激发下的单层MoS₂晶粒进行了近场纳米显微成像表征，并分析了晶粒边缘近场光力信号增强的机制。研究结果表明，THz PiFM对二维材料中的载流子具有高灵敏的探测能力。与传统的太赫兹近场显微成像技术相比，THz PiFM无需太赫兹探测器，而且可获得更加优越的空间分辨率和成像信噪比，是一种低成本、高性能的新型太赫兹近场显微成像技术。

目前太赫兹(Terahertz, THz)成像技术在许多领域被视为最前沿技术之一，经过20年的发展，取得了巨大进步。随着科研、医疗、**以及工业应用需求的增长，高分辨率THz图像变得不可或缺。超分辨率成像是目前THz技术的研究热点。本文首先回顾了THz系统的成像方法，包括连续波成像与脉冲波成像两种方式；在此基础上，详细介绍了THz超分辨率成像系统与THz信号处理技术，其中超分辨率成像系统包括近场成像、超透镜以及太喷射装置等，THz信号处理技术包括超分辨率重建与卷积计算等；最后，通过分析目前超分辨率成像存在的不足，比如系统的制造工艺要求高、采集速度慢以及重建图像使用的学习样本分辨率较低等，从而进一步对超分辨率成像研究方向进行展望。

Optical antennas play an important role in optical field manipulation. Among them, nanoscale bowtie antennas have been extensively studied for its high confinement and enhancement. In this mini-review, we start with a brief introduction of bowtie antennas and underlying physics. Then we review the applications with respect to optically and electrically excited nanoscale bowtie antennas. Optically driven bowtie antennas enable a set of optical applications such as near-field imaging/trapping, nonlinear response, nanolithography, photon generation and detection. Finally, we put emphasis on the principle and applications of electrically driven bowtie antennas, an emerging method of generating ultrafast and broadband tunable nanosources. In a word, nanoscale bowtie antennas still have great potential research value to explore.Optical antennas play an important role in optical field manipulation. Among them, nanoscale bowtie antennas have been extensively studied for its high confinement and enhancement. In this mini-review, we start with a brief introduction of bowtie antennas and underlying physics. Then we review the applications with respect to optically and electrically excited nanoscale bowtie antennas. Optically driven bowtie antennas enable a set of optical applications such as near-field imaging/trapping, nonlinear response, nanolithography, photon generation and detection. Finally, we put emphasis on the principle and applications of electrically driven bowtie antennas, an emerging method of generating ultrafast and broadband tunable nanosources. In a word, nanoscale bowtie antennas still have great potential research value to explore.

采用太赫兹散射式扫描近场光学显微镜（THz s-SNOM）研究了化学气相沉积法制备的单层MoS₂和WS₂晶粒的太赫兹近场响应。在没有可见光激发时，未探测到可分辨的太赫兹近场响应，说明晶粒具有较低的掺杂载流子浓度。有可见光激发时，由于光生载流子的太赫兹近场响应，能够测得与晶粒轮廓完全吻合的太赫兹近场显微图。在相同的光激发条件下，MoS₂的太赫兹近场响应强于WS₂，反映了两者之间载流子浓度或迁移率的差异。研究结果表明，THz s-SNOM兼具超高的空间分辨率和对光生载流子的灵敏探测能力，对二维半导体材料和器件光电特性的微观机理研究具有独特的优势。