Efficient coupling of double-metal terahertz quantum cascade lasers to flexible dielectric-lined hollow metallic waveguides

Wallis, R. et al. (2015) Efficient coupling of double-metal terahertz quantum cascade lasers to flexible dielectric-lined hollow metallic waveguides. Optics Express, 23(20), pp. 26276-26287. (doi: 10.1364/OE.23.026276) (PMID:26480141)

120389.pdf - Published Version



The growth in terahertz frequency applications utilising the quantum cascade laser is hampered by a lack of targeted power delivery solutions over large distances (>100 mm). Here we demonstrate the efficient coupling of double-metal quantum cascade lasers into flexible polystyrene lined hollow metallic waveguides via the use of a hollow copper waveguide integrated into the laser mounting block. Our approach exhibits low divergence, Gaussian-like emission, which is robust to misalignment error, at distances > 550 mm, with a coupling efficiency from the hollow copper waveguide into the flexible waveguide > 90%. We also demonstrate the ability to nitrogen purge the flexible waveguide, increasing the power transmission by up to 20% at 2.85 THz, which paves the way for future fibre based terahertz sensing and spectroscopy applications.

Item Type:Articles
Additional Information:The authors acknowledge financial support from the Engineering and Physical Sciences Research Council (Grant No. EP/J017671/1, Coherent Terahertz Systems). Additional data sets related to this publication are available from the Cambridge University data repository at https://www.repository.cam.ac.uk/handle/1810/249004.
Glasgow Author(s) Enlighten ID:Shah, Dr Yash Diptesh
Authors: Wallis, R., Degl’Innocenti, R., Jessop, D.S., Ren, Y., Klimont, A., Shah, Y.D., Mitrofanov, O., Bledt, C.M., Melzer, J.E., Harrington, J. A., Beere, H.E., and Ritchie, D.A.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Optics Express
Publisher:Optical Society of America
ISSN (Online):1094-4087
Copyright Holders:Copyright © 2015 OSA
First Published:First published in Optics Express 23(20):26276-26287
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

University Staff: Request a correction | Enlighten Editors: Update this record