National Research Council of Canada. Information and Communication Technologies
ICOOPMA2014, Sixth International Conference on Optical, Optoelectronic and Photonic Materials and Applications, July 27-Aug. 1, 2014, Leeds, U.K.
The impacts of interface roughness (IR) scattering on device performance of indirectly-pumped (IDP) terahertz quantum cascade lasers are studied. Three different active region designs with almost the same lasing frequency at threshold and comparable oscillator strength are experimentally investigated and the measurement data are analyzed and compared with numerical simulation. The simulation results show that all structures suffer from the detrimental effect of intersubband roughness scattering in terms of threshold current density, and probably operating temperature. The intrasubband IR scattering time could also to be a limiting factor in the IDP structures due to the employed high energetic barrier.
ICOOPMA2014, Sixth International Conference on Optical, Optoelectronic and Photonic Materials and Applications [Proceedings]619 (17 June 2015): 1–6.