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Waveguide integration of a >4.7-THz quantum-cascade laser
  • +11
  • Eleanor Nuttall,
  • Yingjun Han,
  • Diego Pardo,
  • Sanchit Kondawar,
  • Nick Brewster,
  • Mohammed Salih,
  • Lianhe Li,
  • Michael Horbury,
  • Giles Davies,
  • Edmund Linfield,
  • Hui Wang,
  • Paul Dean,
  • Brian Ellison,
  • Alexander Valavanis
Eleanor Nuttall
University of Leeds

Corresponding Author:cm14en@leeds.ac.uk

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Yingjun Han
University of Leeds
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Diego Pardo
Rutherford Appleton Laboratory
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Sanchit Kondawar
University of Leeds
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Nick Brewster
Rutherford Appleton Laboratory
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Mohammed Salih
University of Leeds
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Lianhe Li
University of Leeds
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Michael Horbury
University of Leeds
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Giles Davies
University of Leeds
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Edmund Linfield
University of Leeds
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Hui Wang
Rutherford Appleton Laboratory
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Paul Dean
University of Leeds
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Brian Ellison
Rutherford Appleton Laboratory
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Alexander Valavanis
University of Leeds
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Abstract

We have demonstrated waveguide integration of terahertz quantum cascade lasers (THz QCLs) at frequencies above 4.7 THz. A precision micromachining technique, followed by diamond-turning and electroless-plating has been used to manufacture hollow rectangular waveguides with integrated diagonal feedhorns. We show that surface roughness at the 1μm level is achieved, enabling outcoupling of radiation in the 4.75–5.05 THz band, with a divergence angle of 5° along the plane of the QCL substrate.
10 May 2022Submitted to Electronics Letters
10 May 2022Submission Checks Completed
10 May 2022Assigned to Editor
19 Jun 2022Reviewer(s) Assigned
26 Jun 2022Review(s) Completed, Editorial Evaluation Pending
18 Aug 2022Editorial Decision: Revise Minor
16 Sep 20221st Revision Received
20 Sep 2022Submission Checks Completed
20 Sep 2022Assigned to Editor
20 Sep 2022Review(s) Completed, Editorial Evaluation Pending
12 Dec 2022Editorial Decision: Accept