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Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser

Dean, P; Mitrofanov, O; Keeley, J; Kundu, I; Li, L; Linfield, EH; Giles Davies, A; (2016) Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser. Applied Physics Letters , 108 (9) , Article 091113. 10.1063/1.4943088. Green open access

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Abstract

We report two-dimensional apertureless near-field terahertz (THz) imaging using a quantum cascade laser (QCL) source and a scattering probe. A near-field enhancement of the scattered field amplitude is observed for small tip-sample separations, allowing image resolutions of ∼1 μm (∼λ/100) and ∼7 μm to be achieved along orthogonal directions on the sample surface. This represents the highest resolution demonstrated to date with a THz QCL. By employing a detection scheme based on self-mixing interferometry, our approach offers experimental simplicity by removing the need for an external detector and also provides sensitivity to the phase of the reinjected field.

Type: Article
Title: Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4943088
Publisher version: http://dx.doi.org/10.1063/1.4943088
Language: English
Additional information: Copyright © The Author(s), 2016. All rights reserved. This manuscript version is made available under a Creative Commons Attribution Non-commercial Non-derivative 4.0 International license (CC BY-NC-ND 4.0). This license allows you to share, copy, distribute and transmit the work for personal and non-commercial use providing author and publisher attribution is clearly stated. Further details about CC BY licenses are available at http://creativecommons.org/ licenses/by/4.0.
Keywords: Quantum cascade lasers, Terahertz imaging, Surface scattering, Medical imaging, Image detection systems
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/1505819
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