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.
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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 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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