Terahertz intersubband electroluminescence from n-type germanium quantum wells

Stark, D. et al. (2021) Terahertz intersubband electroluminescence from n-type germanium quantum wells. In: 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), Munich, Germany, 21-25 June 2021, ISBN 9781665448048 (doi: 10.1109/CLEO/Europe-EQEC52157.2021.9541838)

Abstract

The Quantum Cascade Laser (QCL) has been demonstrated in polar III-V semiconductor materials employing transitions between conduction band states [1] . Harnessing intersubband transitions allows lasing at mid-infrared and far-infrared wavelengths. Buried InGaAs/InAlAs QCLs unlocked the mid-infrared application space, because they are operational at room-temperature and in continuous wave [2] . However, THz QCLs remain limited up to 250 K in pulsed operation with a large dissipation [3] . The quenching of the laser emission is related to ther-mally activated LO phonon emission in polar materials. Exploiting intersubband transitions in non-polar group IV materials with weaker electron-phonon interaction is an exciting approach to realize a Si-based THz QCL and to eventually elevate the operation temperature [4] .

• Item Type: Conference Proceedings
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Paul, Professor Douglas and Mirza, Dr Muhammad M A
• Authors: Stark, D., Mirza, M., Persichetti, L., Montanari, M., Markmann, S., Beck, M., Grange, T., Birner, S., Virgilio, M., Ciano, C., Ortolani, M., Corley, C., Capellini, G., Di Gaspare, L., De Seta, M., Paul, D. J., Faist, J., and Scalari, G.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• ISBN: 9781665448048
• Copyright Holders: Copyright © 2021 IEEE
• First Published: First published in Proceedings of the 2021 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher