Resonance-Amplified Terahertz Near-Field Spectroscopy of a Single Nanowire
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.
Authors
- Kun Peng (ORCID: https://orcid.org/0000-0002-2111-3341)
- Michael B. Johnston (ORCID: https://orcid.org/0000-0002-0301-8033)
- Thomas Siday (ORCID: https://orcid.org/0000-0003-0157-3233)
- C. Jagadish (ORCID: https://orcid.org/0000-0003-1528-9479)
- Oleg Mitrofanov (ORCID: https://orcid.org/0000-0003-3510-2675)
- Ralf Mouthaan (ORCID: https://orcid.org/0000-0001-9817-0742)
- James Seddon (ORCID: https://orcid.org/0000-0002-4651-1960)
- Hannah J. Joyce (ORCID: https://orcid.org/0000-0002-9737-680X)
- Jack Alexander-Webber (ORCID: https://orcid.org/0000-0002-9374-7423)
- Hark Hoe Tan (ORCID: https://orcid.org/0000-0002-7816-537X)
- Lucy L. Hale (ORCID: https://orcid.org/0000-0001-7654-4272)
- Sarah Norman (ORCID: https://orcid.org/0009-0005-2434-2317)
- Greg Chu (ORCID: https://orcid.org/0009-0001-8547-7048)
Institutions
- Australian National University (AU)
- Australian Research Council (AU)
- University of Cambridge (GB)
- ETH Zurich (CH)
- University of Oxford (GB)
- University College London (GB)
- The University of Adelaide (AU)
- University of Birmingham (GB)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-11-26
- DOI
- https://doi.org/10.1021/acs.nanolett.4c04395
- Citations
- 4
- Primary Topic
- Thermal Radiation and Cooling Technologies
- Type
- article
- Field-Weighted Citation Impact
- 1.04
Funders
- U.S. Department of Energy
- Australian National Fabrication Facility
- Royal Society
- Engineering and Physical Sciences Research Council
- European Research Council
- Australian Research Council
- Basic Energy Sciences
- Division of Materials Sciences and Engineering