Free-carrier absorption in quantum cascade structures
Carosella, F.; Ndebeka-Bandou, C.; Ferreira, R.; Dupont, E., et al. (2012). Free-carrier absorption in quantum cascade structures. Physical Review B (Condensed Matter and Materials Physics), 85, (8)
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Published
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English
Authors:
Carosella, F.
;
Ndebeka-Bandou, C.
;
Ferreira, R.
;
Dupont, E.
, et al.
Department:
Mathematical Physics
Linne Center for Nanoscience and Quantum Engineering-lup-obsolete
NanoLund: Centre for Nanoscience
Research Group:
Linne Center for Nanoscience and Quantum Engineering-lup-obsolete
Abstract:
We show that the free-carrier absorption in quantum cascade lasers (QCLs) is very small and radically different from the classical Drude result due to the orthogonality between the direction of the carrier free motion and the electric field of the laser emission. A quantum mechanical calculation of the free-carrier absorption and intersubband oblique absorption induced by interface defects, Coulombic impurities, and optical phonon absorption/emission is presented for QCLs with a double-quantum-well design. The interaction between the electrons and the optical phonons dominates at room temperature.
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