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Investigation of hollow cylindrical metal terahertz waveguides suitable for cryogenic environments

Wallis, R; Degl'Innocenti, R; Jessop, DS; Mitrofanov, O; Bledt, CM; Melzer, JE; Harrington, JA; ... Ritchie, DA; + view all (2016) Investigation of hollow cylindrical metal terahertz waveguides suitable for cryogenic environments. Optics Express , 24 (26) pp. 30002-30014. 10.1364/OE.24.030002. Green open access

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Abstract

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 low-temperature THz applications, and enabling the study of fundamental physics.

Type: Article
Title: Investigation of hollow cylindrical metal terahertz waveguides suitable for cryogenic environments
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.24.030002
Publisher version: http://doi.org/10.1364/OE.24.030002
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Science & Technology, Physical Sciences, Optics, QUANTUM CASCADE LASERS, TRANSMISSION, SPECTROSCOPY, RADIATION, LIGHT
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1573057
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