Optical cavities for Si/SiGe tetrahertz quantum cascade emitters

Kelsall, R.W. et al. (2005) Optical cavities for Si/SiGe tetrahertz quantum cascade emitters. Optical Materials, 27(5), pp. 851-854. (doi: 10.1016/j.optmat.2004.08.023)

Abstract

The use of buried tungsten silicide layers for confinement of terahertz optical modes is described. Silicon-on-silicide substrates are prepared using a bond and etch-back technique, and the successful growth of extremely long (600 period) strain-balanced p-Si/SiGe quantum cascade heterostructures on these substrates is demonstrated. THz electroluminescence is observed from these structures at low temperature, when the structure is biased so as to obtain interwell (‘diagonal’) transitions between heavy and light hole subbands. The emission shows a strong polarisation dependence, indicating the efficacy of the silicide layer in confining long wavelength TM modes.

• Item Type: Articles
• Additional Information: Si-Based Photonics: Towards True Monolithic Integration. Proceedings of the Symposium of the European Materials Research Society, Strasbourg, France, 25-28 May 2004
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Paul, Professor Douglas
• Authors: Kelsall, R.W., Ikonic, Z., Lynch, S.A., Townsend, P., Paul, D.J., Norris, D.J., Liew, S.L., Cullis, A.G., Li, X., Zhang, J., Bain, M., and Gamble, H.S.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Research Group: Semiconductor Devices
• Journal Name: Optical Materials
• Publisher: IOP Publishing
• ISSN: 0925-3467
• ISSN (Online): 1873-1252