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.
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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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