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A phonon scattering assisted injection and extraction based terahertz quantum cascade laser | | E. Dupont
; S. Fathololoumi
; Z.R. Wasilewski
; G. Aers
; S. R. Laframboise
; M. Lindskog
; A. Wacker
; D. Ban
; H. C. Liu
; | | Date: |
20 Jan 2012 | | Abstract: | A novel lasing scheme for terahertz quantum cascade lasers, based on
consecutive phonon-photon-phonon emissions per module, is proposed and
experimentally demonstrated. The charge transport of the proposed structure is
modeled using a rate equation formalism. An optimization code based on a
genetic algorithm was developed to find a four-well design in the
$mathrm{GaAs/Al_{0.25}Ga_{0.75}As}$ material system that maximizes the product
of population inversion and oscillator strength at 150 K. The fabricated
devices using Au double-metal waveguides show lasing at 3.2 THz up to 138 K.
The electrical characteristics display no sign of differential resistance drop
at lasing threshold, which suggests - thanks to the rate equation model - a
slow depopulation rate of the lower lasing state, a hypothesis confirmed by
non-equilibrium Green’s function calculations. | | Source: | arXiv, 1201.4189 | | Services: | Forum | Review | PDF | Favorites | |
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