Journal
JOURNAL OF APPLIED PHYSICS
Volume 115, Issue 16, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4873461
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Funding
- NSF Grant [ECCS-1150449]
- DARPA Grant [66001-12-14241]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1150449] Funding Source: National Science Foundation
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We report an experimental study of terahertz quantum cascade lasers with variable barrier heights based on the AlxGa1-As-x/GaAs material system. Two new designs are developed based on semiclassical ensemble Monte Carlo simulations using state-of-the-art Al0.15Ga0.85As/GaAs three-quantum-well resonant phonon depopulation active region design as a reference. The new designs achieved maximum lasing temperatures of 188K and 172 K, as compared to the maximum lasing temperature of 191K for the reference structure. These results demonstrate that terahertz quantum cascade laser designs with variable barrier heights provide a viable alternative to the traditional active region designs with fixed barrier composition. Additional design space offered by using variable barriers may lead to future improvements in the terahertz quantum cascade laser performance. (C) 2014 AIP Publishing LLC.
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