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Terahertz near-field microscopy using the self-mixing effect in a quantum cascade laser

Dean, P; Mitrofanov, O; Keeley, J; Kundu, I; Li, L; Linfield, EH; Davies, AG; (2016) Terahertz near-field microscopy using the self-mixing effect in a quantum cascade laser. In: 2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz). IEEE: Copenhagen, Denmark. Green open access

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Abstract

We demonstrate terahertz (THz) apertureless nearfield microscopy exploiting the self-mixing effect in a quantum cascade laser (QCL). A THz wave is scattered by a sharp needle positioned above an object and coupled back into the QCL cavity resulting in detection of the THz near-field signal through the self-mixing effect. Using this technique we demonstrate twodimensional imaging at 2.53 THz with a spatial resolution of ︎ 1 µm – the highest image resolution achieved with a THz frequency QCL to date. This method offers an experimentally simple approach to coherent, high-resolution THz imaging.

Type: Proceedings paper
Title: Terahertz near-field microscopy using the self-mixing effect in a quantum cascade laser
Event: 41st International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)
Location: Copenhagen, DENMARK
Dates: 25 September 2016 - 30 September 2016
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/IRMMW-THz.2016.7758590
Publisher version: https://doi.org/10.1109/IRMMW-THz.2016.7758590
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
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/10113666
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