Single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers

• Main Authors: Liang, Guozhen, Liang, Houkun, Zhang, Ying, Khanna, Suraj P., Li, Lianhe, Davies, A. Giles, Linfield, Edmund, Lim, Dau Fatt, Tan, Chuan Seng, Yu, Siu Fung, Liu, Hui Chun, Wang, Qi Jie
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2013
• Subjects: DRNTU::Engineering::Electrical and electronic engineering::Electronic systems::Signal processing
• Online Access: https://hdl.handle.net/10356/96435; http://hdl.handle.net/10220/9888
• Institution: Nanyang Technological University

We demonstrate single-mode surface-emitting terahertz frequency quantum cascade lasers utilising non-uniform second-order distributed feedback concentric-circular-gratings. The grating is designed for single-mode operation and surface emission for efficient and directional optical power out-couplin...