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Title: Experimental investigation of terahertz quantum cascade laser with variable barrier heights

We report an experimental study of terahertz quantum cascade lasers with variable barrier heights based on the Al{sub x}Ga{sub 1–x}As/GaAs material system. Two new designs are developed based on semiclassical ensemble Monte Carlo simulations using state-of-the-art Al{sub 0.15}Ga{sub 0.85}As/GaAs three-quantum-well resonant phonon depopulation active region design as a reference. The new designs achieved maximum lasing temperatures of 188 K and 172 K, as compared to the maximum lasing temperature of 191 K 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.
Authors:
; ;  [1] ; ;  [2] ;  [3]
  1. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758 (United States)
  2. Institute for Nanoelectronics, Technische Universität München, D-80333 Munich (Germany)
  3. Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario N2L 3G (Canada)
Publication Date:
OSTI Identifier:
22273519
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; ALUMINIUM COMPOUNDS; COMPUTERIZED SIMULATION; GALLIUM ARSENIDES; MONTE CARLO METHOD; PHONONS; QUANTUM WELLS; SEMICLASSICAL APPROXIMATION; SOLID STATE LASERS; THZ RANGE; X-RAY SPECTROSCOPY