Actions for Mid-infrared quantum dot emitters utilizing planar photonic crystal technology [electronic resource].

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Mid-infrared quantum dot emitters utilizing planar photonic crystal technology [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2008.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
26 pages : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The three-dimensional confinement inherent in InAs self-assembled quantum dots (SAQDs) yields vastly different optical properties compared to one-dimensionally confined quantum well systems. Intersubband transitions in quantum dots can emit light normal to the growth surface, whereas transitions in quantum wells emit only parallel to the surface. This is a key difference that can be exploited to create a variety of quantum dot devices that have no quantum well analog. Two significant problems limit the utilization of the beneficial features of SAQDs as mid-infrared emitters. One is the lack of understanding concerning how to electrically inject carriers into electronic states that allow optical transitions to occur efficiently. Engineering of an injector stage leading into the dot can provide current injection into an upper dot state; however, to increase the likelihood of an optical transition, the lower dot states must be emptied faster than upper states are occupied. The second issue is that SAQDs have significant inhomogeneous broadening due to the random size distribution. While this may not be a problem in the long term, this issue can be circumvented by using planar photonic crystal or plasmonic approaches to provide wavelength selectivity or other useful functionality.
Report Numbers
E 1.99:sand2008-6217
sand2008-6217
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Note
Published through SciTech Connect.
09/01/2008.
"sand2008-6217"
Subramania,Ganapathi Subramanian; El-Kady, Ihab Fathy; Lyo, Sungkwun Kenneth; Cederberg, Jeffrey George; Shaner, Eric Arthur; Passmore, Brandon Scott.
Funding Information
AC04-94AL85000
View MARC record | catkey: 14345153