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A terahertz near-field nanoscopy revealing edge fringes with a fast and highly sensitive quantum-well photodetector
Qiu, Fucheng1,2,3,4; You, Guanjun5,6; Tan, Zhiyong1,2; Wan, Wenjian1,2; Wang, Chang1,2; Liu, Xiao5,6; Chen, Xinzhong7; Liu, Rui8; Tao, Hu9; Fu, Zhanglong1,2
2022-07-15
摘要We demonstrate the successful implementation of a terahertz (THz) quantum-well photodetector (QWP) for effective signal collection in a scattering-type scanning near-field optical microscope (s-SNOM) system. The light source is an electrically pumped THz quantum cascade laser (QCL) at 4.2 THz, which spectrally matches with the peak photoresponse of THz QWP. The sensitive THz QWP has a low noise equivalent power (NEP) of about 1.1 pW/Hz0.5 and a spectral response range from 2 to 7 THz. The fast-responding capability of the THz QWP is vital for detecting the rapidly tip-modulated THz light which can effectively suppress the background noise. The THz images of the nanostructure demonstrate a spatial resolution of about 95 nm, corresponding to ,-,l/752 at 4.2 THz. We experimentally investigate and theoretically interpret the formation of the fringes which appear at the edge position of a gold stripe in the THz near-field image.
DOI10.1016/j.isci.2022.104637
发表期刊ISCIENCE
卷号25期号:7页码:14
通讯作者Tan, Zhiyong(zytan@mail.sim.ac.cn) ; Wang, Chang(cwang@mail.sim.ac.cn) ; Cao, Juncheng(jccao@mail.sim.ac.cn)
收录类别SCI
WOS记录号WOS:000834840400003
语种英语