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Quantum cascade laser design based on impurity–band transitions of donors in Si/GeSi(111) heterostructures

Bekin, N. A. and Pavlov, S. G. (2009) Quantum cascade laser design based on impurity–band transitions of donors in Si/GeSi(111) heterostructures. Physica B: Condensed Matter, 404 (23-24), pp. 4716-4718. Elsevier. DOI: 10.1016/j.physb.2009.08.163.

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Abstract

The possibility of amplification of terahertz radiation due to optical transitions between a two- dimensional state continuum (2D) and shallow-level donor states in Si/GeSi(111) superlattices with selectively delta-doped quantum wells is analyzed theoretically. The mechanism of population inversion is based on fast ionization of donor centers by phonon-assisted tunneling into continuum of a lower subband in the neighboring quantum well. The fast tunneling is caused by hybridization of the impurity ground state and a 2D state continuum in the neighboring quantum well. It is shown that for the donor concentration of 5x10^11 cm^2 per period the terahertz gain can be as high as 10 cm^-1 in the wavelength range of 29–45 µm (6.5–10.2 THz).

Document Type:Article
Title:Quantum cascade laser design based on impurity–band transitions of donors in Si/GeSi(111) heterostructures
Authors:
AuthorsInstitution or Email of Authors
Bekin, N. A.Institute for Physics of Microstructures, Russian Academy of Sciences
Pavlov, S. G.UNSPECIFIED
Date:2009
Journal or Publication Title:Physica B: Condensed Matter
Volume:404
DOI:10.1016/j.physb.2009.08.163
Page Range:pp. 4716-4718
Publisher:Elsevier
Status:Published
Keywords:Quantum cascade lasers Impurity resonant states Terahertz
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt SOFIA (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Terahertz and Infrared Sensors
Deposited By: Dr. Sergey Pavlov
Deposited On:06 Jan 2010 12:48
Last Modified:12 Dec 2013 20:50

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