Tall-barrier terahertz quantum cascade lasers

Author(s)
Hu, Qing; Reno, John L.; Chan, Chun Wang Ivan
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Abstract
A terahertz quantum cascade laser is presented in which selectively placed pure AlAs barriers are used to reduce parasitic leakage currents to the conduction band continuum. The design is demonstrated to have improved temperature performance over a regrowth of the current T [subscript max] ∼ 200 K record holder (181 K vs. 175 K). Strangely, it fails to lase below ∼70 K, which we attribute to negative differential resistance (NDR) prior to threshold. A subsequent design using only AlAs barriers failed to lase, the reason for which we posit to be either early NDR or excessive interface roughness scattering.
Date issued
2013-10
URI
http://hdl.handle.net/1721.1/87103
Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Chan, Chun Wang I., Qing Hu, and John L. Reno. “Tall-Barrier Terahertz Quantum Cascade Lasers.” Appl. Phys. Lett. 103, no. 15 (2013): 151117. © 2013 AIP Publishing LLC
Version: Final published version
ISSN
00036951
1077-3118
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