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Terahertz sensing and imaging using a quantum cascade laser

Dean, P, Valavanis, A, Khanna, SP, Lachab, M, Indjin, D, Ikonic, Z, Harrison, P, Linfield, EH, Davies, AG and Lim, YL (2011) Terahertz sensing and imaging using a quantum cascade laser. In: Proceedings of IEEE Sensors. IEEE Sensors, 28-31 October 2011, Limerick. IEEE , 51 - 54 . ISBN 978-1-4244-9290-9


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We demonstrate terahertz (THz) frequency imaging and sensing using a single quantum cascade laser (QCL) device for both generation and sensing of THz radiation. Detection is achieved by utilising the effect of self-mixing in the THz QCL, and specifically by monitoring perturbations to the voltage across the QCL induced by light reflected from an external object back into the laser cavity. Self-mixing offers high sensitivity, a potentially fast response, and a simple, compact optical design. We show that it can be used to obtain high-resolution reflection images of exemplar structures, as well as for the measurement of the displacement of a remote target, both with and without opaque (in the visible spectrum) materials in the beam path. We also demonstrate displacement sensing over a stand-off distance of 7m through air.

Item Type: Proceedings Paper
Copyright, Publisher and Additional Information: © 2011, IEEE. This is an author produced version of a paper published in Proceedings of IEEE Sensors. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: quantum cascade lasers, terahertz wave detectors, terahertz wave imaging, Displacement measurement, Imaging, Measurement by laser beam, Optical feedback, Semiconductor device measurement, Sensors, optical design, quantum cascade laser, terahertz imaging, terahertz sensing
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Electronic & Electrical Engineering (Leeds)
Depositing User: Symplectic Publications
Date Deposited: 26 Mar 2012 14:18
Last Modified: 18 Sep 2014 05:33
Published Version: http://dx.doi.org/10.1109/ICSENS.2011.6127149
Status: Published
Publisher: IEEE
Refereed: Yes
Identification Number: 10.1109/ICSENS.2011.6127149
URI: http://eprints.whiterose.ac.uk/id/eprint/43783

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