Norman, Sarah;
Chu, Greg;
Peng, Kun;
Seddon, James;
Hale, Lucy L;
Tan, Hark Hoe;
Jagadish, Chennupati;
... Siday, Thomas; + view all
(2024)
Resonance-Amplified Terahertz Near-Field Spectroscopy of a Single Nanowire.
Nano Letters
, 24
(49)
pp. 15716-15723.
10.1021/acs.nanolett.4c04395.
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Abstract
Nanoscale material systems are central to next-generation optoelectronic and quantum technologies, yet their development remains hindered by limited characterization tools, particularly at terahertz (THz) frequencies. Far-field THz spectroscopy techniques lack the sensitivity for investigating individual nanoscale systems, whereas in near-field THz nanoscopy, surface states, disorder, and sample-tip interactions often mask the response of the entire nanoscale system. Here, we present a THz resonance-amplified near-field spectroscopy technique that can detect subtle conductivity changes in isolated nanoscale systems─such as a single InAs nanowire─under ultrafast photoexcitation. By exploiting the spatial localization and resonant field enhancement in the gap of a bowtie antenna, our approach enables precise measurements of the nanostructures through shifts in the antenna resonant frequency, offering a direct means of extracting the system response, and unlocking investigations of ultrafast charge-carrier dynamics in isolated nanoscale and microscale systems.
| Type: | Article |
|---|---|
| Title: | Resonance-Amplified Terahertz Near-Field Spectroscopy of a Single Nanowire |
| Location: | United States |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1021/acs.nanolett.4c04395 |
| Publisher version: | https://doi.org/10.1021/acs.nanolett.4c04395 |
| Language: | English |
| Additional information: | This publication is licensed under CC-BY 4.0 . |
| Keywords: | Near-field microscopy, Ultrafast dynamics, Terahertz spectroscopy, Nanowires |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10207994 |
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