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Phase-sensitive terahertz imaging using room-temperature near-field nanodetectors

Giordano, MC; Viti, L; Mitrofanov, O; Vitiello, MS; (2018) Phase-sensitive terahertz imaging using room-temperature near-field nanodetectors. Optica , 5 (5) pp. 651-657. 10.1364/OPTICA.5.000651. Green open access

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Abstract

Imaging applications in the terahertz (THz) frequency range are severely restricted by diffraction. Near-field scanning probe microscopy is commonly employed to enable mapping of the THz electromagnetic fields with sub-wavelength spatial resolution, allowing intriguing scientific phenomena to be explored, such as charge carrier dynamics in nanostructures and THz plasmon-polaritons in novel 2D materials and devices. High-resolution THz imaging, so far, has relied predominantly on THz detection techniques that require either an ultrafast laser or a cryogenically cooled THz detector. Here, we demonstrate coherent near-field imaging in the THz frequency range using a room-temperature nanodetector embedded in the aperture of a near-field probe, and an interferometric optical setup driven by a THz quantum cascade laser. By performing phase-sensitive imaging of strongly confined THz fields created by plasmonic focusing, we demonstrate the potential of our novel architecture for high-sensitivity coherent THz imaging with sub-wavelength spatial resolution.

Type: Article
Title: Phase-sensitive terahertz imaging using room-temperature near-field nanodetectors
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OPTICA.5.000651
Publisher version: https://doi.org/10.1364/OPTICA.5.000651
Additional information: Copyright © 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
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/10059884
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