eprintid: 1573059 rev_number: 25 eprint_status: archive userid: 608 dir: disk0/01/57/30/59 datestamp: 2017-09-10 07:58:33 lastmod: 2021-10-07 21:56:08 status_changed: 2017-09-14 14:02:14 type: proceedings_section metadata_visibility: show creators_name: Wallis, R creators_name: Degl'Innocenti, R creators_name: Mitrofanov, O creators_name: Waldie, J creators_name: Bledt, CM creators_name: Melzer, JE creators_name: Harrington, JA creators_name: Beere, HE creators_name: Ritchie, DA title: Mechanically robust cylindrical metal terahertz waveguides for cryogenic applications ispublished: pub divisions: UCL divisions: B04 divisions: C05 divisions: F46 keywords: Science & Technology, Technology, Physical Sciences, Engineering, Electrical & Electronic, Optics, Physics, Applied, Engineering, Physics, Terahertz waveguides, quantum cascade laser, mode profile, beam shaping, cryogenics, optical components, QUANTUM CASCADE LASERS, TRANSMISSION, RADIATION note: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. abstract: As the ambition behind THz quantum cascade laser based applications continues to grow, abandoning free-space optics in favor of waveguided systems promises major improvements in targeted, easy to align, and robust radiation delivery. This is especially true in cryogenic environments, where illumination is traditionally challenging. Although the field of THz waveguides is rapidly developing, most designs have limitations in terms of mechanical stability at low temperatures, and are costly and complicated to fabricate to lengths > 1 m. In this work, we investigate readily available cylindrical metal waveguides which are suitable for effective power delivery in cryogenic environments, and explore the optimal dimensions and materials available. The materials chosen were extruded un-annealed and annealed copper, as well as stainless steel, with bore diameters of 1.75, 2.5, and 4.6 mm. Measurements were performed at three different frequencies, 2.0, 2.85 and 3.2 THz, with optimal transmission losses <3 dB/m demonstrated at 2.0 THz. Additionally, novel optical couplers are also presented and characterised, with the ability to change the beam path by 90° with a coupling loss of just 2.2 dB whilst maintaining mode quality, or thermally isolate sections of waveguide with a coupling loss as low as 0.5 dB. The work presented here builds on previous work1, and forms a comprehensive investigation of cryogenically compatible THz waveguides and optical couplers, paving the way for a new generation of systems to utilize THz QCLs for a host of low-temperature investigations. date: 2017-01-30 date_type: published publisher: SPIE - International Society of Optical Engineering official_url: http://doi.org/10.1117/12.2250530 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1300165 doi: 10.1117/12.2250530 isbn_13: 978-1-5106-0648-7 lyricists_name: Mitrofanov, Oleg lyricists_id: OMITR95 full_text_status: public series: Proceedings of SPIE publication: TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND APPLICATIONS X pagerange: 1010307-1010307 pages: 9 event_title: Conference on Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X event_location: San Francisco, CA event_dates: 30 January 2017 - 02 February 2017 institution: Conference on Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X issn: 0277-786X editors_name: Sadwick, LP editors_name: Yang, T citation: Wallis, R; Degl'Innocenti, R; Mitrofanov, O; Waldie, J; Bledt, CM; Melzer, JE; Harrington, JA; ... Ritchie, DA; + view all <#> Wallis, R; Degl'Innocenti, R; Mitrofanov, O; Waldie, J; Bledt, CM; Melzer, JE; Harrington, JA; Beere, HE; Ritchie, DA; - view fewer <#> (2017) Mechanically robust cylindrical metal terahertz waveguides for cryogenic applications. In: Sadwick, LP and Yang, T, (eds.) (Proceedings) Conference on Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications X. (pp. p. 1010307). SPIE - International Society of Optical Engineering Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/1573059/1/Mitrofanov_Mechanically%20robust%20cylindrical%20metal%20terahertz%20waveguides%20for%20cryogenic%20applications.pdf