Waveguide integration of a >4.7‐THz quantum‐cascade laser. Issue 2 (14th January 2023)

• Record Type: Journal Article
• Authors: Nuttall, Eleanor; Han, Yingjun; Pardo, Diego; Kondawar, Sanchit S.; Brewster, Nick; Salih, Mohammed; Li, Lianhe; Horbury, Michael D.; Davies, A. Giles; Linfield, Edmund H.; Wang, Hui; Dean, Paul; Ellison, Brian N.; Valavanis, Alexander
• Is Part Of: Electronics letters. Volume 59:Issue 2(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-14
• Subjects: microwave technology -- substrate integrated waveguides -- submillimetre wave integrated circuits -- terahertz wave devices -- terahertz wave generation -- quantum cascade lasers -- waveguide components; Electronics -- Periodicals; 621.381
• DOI: 10.1049/ell2.12703
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract: Waveguide integration of terahertz quantum cascade lasers (THz QCLs) is demonstrated 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. It is shown that surface roughness at the ≈ 1 μ m $\approx {1}\, {\mu }\text{m}$ level is achieved, enabling outcoupling of radiation in the 4.75–5.05 THz band, with a divergence angle of < 5 ∘ ${<5^{\circ }}$ along the plane of the QCLs substrate. Abstract : The internal structure of a THz QCL waveguide module.