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.
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15 May 2012
Research Article|
May 21 2012
Improved terahertz quantum cascade laser with variable height barriers
Alpar Matyas;
Alpar Matyas
a)
1Emmy Noether Research Group “Modeling of Quantum Cascade Devices,”
Technische Universität München
, D-80333 Munich, Germany
2Institute for Nanoelectronics,
Technische Universität München
, D-80333 Munich, Germany
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Reza Chashmahcharagh;
Reza Chashmahcharagh
1Emmy Noether Research Group “Modeling of Quantum Cascade Devices,”
Technische Universität München
, D-80333 Munich, Germany
2Institute for Nanoelectronics,
Technische Universität München
, D-80333 Munich, Germany
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Istvan Kovacs;
Istvan Kovacs
3Department of Electrical Engineering,
Technical University of Cluj-Napoca
, Cluj-Napoca, CJ RO-400027, Romania
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Paolo Lugli;
Paolo Lugli
2Institute for Nanoelectronics,
Technische Universität München
, D-80333 Munich, Germany
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Karun Vijayraghavan;
Karun Vijayraghavan
4Department of Electrical and Computer Engineering,
The University of Texas at Austin
, Austin, Texas 78758, USA
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Mikhail A. Belkin;
Mikhail A. Belkin
4Department of Electrical and Computer Engineering,
The University of Texas at Austin
, Austin, Texas 78758, USA
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Christian Jirauschek
Christian Jirauschek
1Emmy Noether Research Group “Modeling of Quantum Cascade Devices,”
Technische Universität München
, D-80333 Munich, Germany
2Institute for Nanoelectronics,
Technische Universität München
, D-80333 Munich, Germany
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Alpar Matyas
1,2,a)
Reza Chashmahcharagh
1,2
Istvan Kovacs
3
Paolo Lugli
2
Karun Vijayraghavan
4
Mikhail A. Belkin
4
Christian Jirauschek
1,2
1Emmy Noether Research Group “Modeling of Quantum Cascade Devices,”
Technische Universität München
, D-80333 Munich, Germany
2Institute for Nanoelectronics,
Technische Universität München
, D-80333 Munich, Germany
3Department of Electrical Engineering,
Technical University of Cluj-Napoca
, Cluj-Napoca, CJ RO-400027, Romania
4Department of Electrical and Computer Engineering,
The University of Texas at Austin
, Austin, Texas 78758, USA
a)
Electronic mail: [email protected]. URL: http://www.nano.ei.tum.de/noether.
J. Appl. Phys. 111, 103106 (2012)
Article history
Received:
January 24 2012
Accepted:
April 12 2012
Citation
Alpar Matyas, Reza Chashmahcharagh, Istvan Kovacs, Paolo Lugli, Karun Vijayraghavan, Mikhail A. Belkin, Christian Jirauschek; Improved terahertz quantum cascade laser with variable height barriers. J. Appl. Phys. 15 May 2012; 111 (10): 103106. https://doi.org/10.1063/1.4719071
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