摘要
太赫兹(THz)近场成像是突破光学衍射极限实现太赫兹超分辨成像的重要方法,对研究材料表面的超快动力学过程具有重要的意义.扫描隧道显微镜(STM)是一种能实现原子级分辨的设备,但引入时间尺度,面临诸多困难.早期从STM固有电学方法发展的时间分辨方法的分辨率受限于电信号传输带宽,基于光信号耦合的泵浦探测方法则面临微带线传输带宽和严重的热效应等限制.在此背景下,THz-STM以低热效应、高隧穿效率、高稳定性等独有的优势为实现100 fs量级和0.1 nm级超高时空分辨成像提供了解决方案,成为太赫兹近场超分辨成像的研究热点.介绍时间分辨STM到THz-STM的发展历史,着重介绍THz-STM的基本原理和现状,为了解THz-STM技术在太赫兹近场超分辨成像中的应用和发展提供了思路.
Terahertz(THz)near-field imaging is an important technique that surpasses the diffraction limit of optics to achieve super-resolution THz imaging;therefore,it is crucial to investigate ultrafast dynamics processes on material surfaces.Although scanning tunneling microscope(STM)achieves atomic-level resolution,it imposes various challenges related to time scales.Early time-resolved methods derived from the inherent electrostatic approach of STM were limited by the bandwidth of electrical signal transmission.Furthermore,pump-probe methods based on optical signal coupling were restricted by the microstrip line bandwidth and severe thermal effects.Hence,due to having unique low thermal effect,high tunneling efficiency,and high stability,THz-STM has emerged as an imaging solution with both ultra-high temporal and spatial resolution of 100 fs and 0.1 nm,respectively.Besides,this technology has become a research hotspot in the field of terahertz near-field super-resolution imaging.This study discusses the developmental history from timeresolved STM to THz-STM,focusing on the fundamental principles and current status of THz-STM.It aims to offer guidance on the application and development of THz-STM technology in terahertz near-field super-resolution imaging.
作者
李洪波
徐靖银
魏文寅
李恩恩
张凯
李鸿
吴一戎
王天武
方广有
Li Hongbo;Xu Jingyin;Wei Wenyin;Li En’en;Zhang Kai;Li Hong;Wu Yirong;Wang Tianwu;Fang Guangyou(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;Key Laboratory of Electromagnetic Radiation and Sensing Technology,Chinese Academy of Sciences,Beijing 100190,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Greater Bay Area Branch of Aerospace Information Research Institute,Chinese Academy of Sciences,Guangzhou 510700,Guangdong,China;Guangdong Provincial Key Laboratory of Terahertz Quantum Electromagnetics,Guangzhou 510700,Guangdong,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2023年第18期3-19,共17页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61988102,12274424,11904056)
广东省重点研发计划(2019B090917007)
广东省科技计划项目(2019B090909011)
广州市基础与应用基础研究项目(202102020053)。
关键词
太赫兹
近场成像
高时空分辨
扫描隧道显微镜
terahertz
near-field imaging
high spatiotemporal resolution
scanning tunneling microscope
