Improved terahertz quantum cascade laser with variable height barriers

Alpar Matyas, Reza Chashmahcharagh, Istvan Kovacs, Paolo Lugli, Karun Vijayraghavan, Mikhail A. Belkin, Christian Jirauschek

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Using an ensemble Monte-Carlo analysis, it is found that relaxing the constraint of identical barrier heights can result in an improved temperature performance. Exploiting this additional design degree of freedom, modified structures with non-uniform barrier heights are developed based on the current record temperature design. For an optimized structure with reduced diagonality, we predict an increase of 31 K for the maximum operating temperature. Furthermore, we develop improved designs with the same oscillator strength as for the reference design. Using a genetic algorithm for optimization, an improvement of the maximum operating temperature by 38 K is obtained. These results aim to show the potential of varying the barrier heigths for the design of high temperature performance terahertz quantum cascade lasers.

Original languageEnglish
Article number103106
JournalJournal of Applied Physics
Volume111
Issue number10
DOIs
StatePublished - 15 May 2012

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