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Investigation of hollow cylindrical metal terahertz waveguides suitable for cryogenic environments

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • R. Wallis
  • Riccardo Degl'Innocenti
  • D. S. Jessop
  • O. Mitrofanov
  • C. M. Bledt
  • J. E. Melzer
  • J. A. Harrington
  • H. E. Beere
  • D. A. Ritchie
<mark>Journal publication date</mark>26/12/2016
<mark>Journal</mark>Optics Express
Issue number26
Number of pages13
Pages (from-to)30002-30014
Publication StatusPublished
Early online date16/12/16
<mark>Original language</mark>English


The field of terahertz (THz) waveguides continues to grow rapidly, with many being tailored to suit the specific demands of a particular final application. Here, we explore waveguides capable of enabling efficient and accurate power delivery within cryogenic environments (<4 K). The performance of extruded hollow cylindrical metal waveguides made of un-annealed and annealed copper, as well as stainless steel, have been investigated for bore diameters between 1.75 - 4.6 mm, and at frequencies of 2.0, 2.85 and 3.4 THz, provided by a suitable selection of THz quantum cascade lasers. The annealed copper resulted in the lowest transmission losses, <3 dB/m for a 4.6 mm diameter waveguide, along with 90° bending losses as low as ∼2 dB for a bend radius of 15.9 mm. The observed trends in losses were subsequently analyzed and related to measured inner surface roughness parameters. These results provide a foundation for the development of a wide array of demanding lowtemperature THz applications, and enabling the study of fundamental physics.