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Resonance-Amplified Terahertz Near-Field Spectroscopy of a Single Nanowire

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dc.contributor.authorNorman, S.
dc.contributor.authorChu, G.
dc.contributor.authorPeng, K.
dc.contributor.authorSeddon, J.
dc.contributor.authorHale, L.L.
dc.contributor.authorTan, H.H.
dc.contributor.authorJagadish, C.
dc.contributor.authorMouthaan, R.
dc.contributor.authorAlexander-Webber, J.
dc.contributor.authorJoyce, H.J.
dc.contributor.authorJohnston, M.B.
dc.contributor.authorMitrofanov, O.
dc.contributor.authorSiday, T.
dc.date.issued2024
dc.description.abstractNanoscale 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.
dc.description.statementofresponsibilitySarah 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
dc.identifier.citationNano Letters, 2024; 24(49):15716-15723
dc.identifier.doi10.1021/acs.nanolett.4c04395
dc.identifier.issn1530-6984
dc.identifier.issn1530-6992
dc.identifier.orcidMouthaan, R. [0000-0001-9817-0742]
dc.identifier.urihttps://hdl.handle.net/2440/144030
dc.language.isoen
dc.publisherACS Publications
dc.relation.granthttp://purl.org/au-research/grants/arc/CE200100010
dc.rights© 2024 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0 .
dc.source.urihttps://doi.org/10.1021/acs.nanolett.4c04395
dc.subjectNanowires
dc.subjectNear-field microscopy
dc.subjectTerahertz spectroscopy
dc.subjectUltrafast dynamics
dc.titleResonance-Amplified Terahertz Near-Field Spectroscopy of a Single Nanowire
dc.typeJournal article
pubs.publication-statusPublished

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