Investigation of hollow cylindrical metal terahertz waveguides suitable for cryogenic environments
Optical Society of America
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Wallis, R., Innocenti, R., Jessop, D., Mitrofanov, O., Bledt, C., Melzer, J., Harrington, J., et al. (2016). Investigation of hollow cylindrical metal terahertz waveguides suitable for cryogenic environments. Optics Express, 24 (26), 30002-30014. https://doi.org/10.1364/OE.24.030002
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.
semiconductor lasers, quantum cascade, (230.7370) wave guides, (140.3300) laser beam shaping
Is supplemented by: https://doi.org/10.17863/CAM.6166
Engineering and Physical Sciences Research Council (Grant No. EP/J017671/1, Coherent Terahertz Systems).
UNIVERSITY COLLEGE LONDON (FB EPSRC) (EP/J017671/1)
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External DOI: https://doi.org/10.1364/OE.24.030002
This record's URL: https://www.repository.cam.ac.uk/handle/1810/262234