Resonance-Amplified Terahertz Near-Field Spectroscopy of a Single Nanowire
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Date
2024
Authors
Norman, S.
Chu, G.
Peng, K.
Seddon, J.
Hale, L.L.
Tan, H.H.
Jagadish, C.
Mouthaan, R.
Alexander-Webber, J.
Joyce, H.J.
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Journal article
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Nano Letters, 2024; 24(49):15716-15723
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Sarah Norman, Greg Chu, Kun Peng, James Seddon, Lucy L Hale, Hark Hoe Tan, Chennupati Jagadish, Ralf Mouthaan, Jack Alexander-Webber, Hannah J Joyce, Michael B Johnston, Oleg Mitrofanov, Thomas Siday
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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.
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© 2024 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0 .