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- W4283068081 abstract "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 ∼λ/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." @default.
- W4283068081 created "2022-06-19" @default.
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- W4283068081 date "2022-07-01" @default.
- W4283068081 modified "2023-10-11" @default.
- W4283068081 title "A terahertz near-field nanoscopy revealing edge fringes with a fast and highly sensitive quantum-well photodetector" @default.
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- W4283068081 doi "https://doi.org/10.1016/j.isci.2022.104637" @default.
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