Biasco, S, Ciavatti, A, Li, L orcid.org/0000-0003-4998-7259 et al. (5 more authors) (2020) Highly efficient one-dimensional quasi-crystalline THz semiconductor lasers. In: 2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). 45th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 08-13 Nov 2020, Buffalo, NY, USA. IEEE , p. 1. ISBN 978-1-7281-6620-9
Abstract
By lithographically patterning a sequence of air slits with different widths, following the Octonacci sequence, on the top metal layer of a double-metal quantum cascade laser, we demonstrate highly efficient surface emission at THz frequencies. The proposed versatile design allows either single-frequency-mode or multimode emission over a 530 GHz bandwidth, with peak optical powers of 240 mW (190 mW) in multimode (single-frequency-mode), record slope efficiencies up to ≈ 570 mW/A at 78 K and ≈ 720 mW/A at 20 K and wall-plug efficiencies η ≈ 1%.