Dean, P orcid.org/0000-0002-3950-4359, Mitrofanov, O, Keeley, J orcid.org/0000-0001-5251-6648 et al. (4 more authors) (2016) Apertureless near-field terahertz imaging using the self-mixing effect in a quantum cascade laser. Applied Physics Letters, 108 (9). 091113. ISSN 0003-6951
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.
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Copyright, Publisher and Additional Information: | © 2016 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. | ||||||||||
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Institution: | The University of Leeds | ||||||||||
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Electronic & Electrical Engineering (Leeds) > Pollard Institute (Leeds) | ||||||||||
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Depositing User: | Symplectic Publications | ||||||||||
Date Deposited: | 08 Mar 2016 15:44 | ||||||||||
Last Modified: | 23 Jun 2023 22:00 | ||||||||||
Published Version: | http://dx.doi.org/10.1063/1.4943088 | ||||||||||
Status: | Published | ||||||||||
Publisher: | American Institute of Physics | ||||||||||
Identification Number: | https://doi.org/10.1063/1.4943088 | ||||||||||
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