Design and simulation of terahertz quantum cascade lasers

Ko¨hler, Ru¨deger; Iotti, Rita C.; Tredicucci, Alessandro; Rossi, Fausto
December 2001
Applied Physics Letters;12/10/2001, Vol. 79 Issue 24, p3920
Academic Journal
Strategies and concepts for the design of THz emitters based on the quantum cascade scheme are analyzed and modeled in terms of a fully three-dimensional Monte Carlo approach; this allows for a proper inclusion of both carrier-carrier and carrier-phonon scattering mechanisms. Starting from the simulation of previously published far-infrared emitters, where no population inversion is achieved, two designs are proposed. The first one follows the well-established chirped-superlattice scheme whereas the second one employs a double-quantum well superlattice to allow energy relaxation through optical phonon emission. For both cases a significant population inversion is predicted at temperatures up to 80 K.


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