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

Wallis, R. and Degl'Innocenti, Riccardo and Jessop, D. S. and Ren, Y. and Klimont, A. and Shah, Y. D. and Mitrofanov, O. and Bledt, C. M. and Melzer, J. E. and Harrington, J. A. and Beere, H. E. and Ritchie, D. A. (2015) Efficient coupling of double-metal terahertz quantum cascade lasers to flexible dielectriclined hollow metallic waveguides. Optics Express, 23 (20). pp. 26276-26287. ISSN 1094-4087

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Abstract

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:
Journal Article
Journal or Publication Title:
Optics Express
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
ID Code:
89624
Deposited By:
Deposited On:
10 Jan 2018 14:42
Refereed?:
Yes
Published?:
Published
Last Modified:
06 May 2020 05:33