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Proceedings Paper

Short-period superlattices: is thinner better?
Author(s): G. J. Brown; H. J. Haugan; F. Szmulowicz; K. Mahalingam; S. R. Munshi; B. Ullrich; S. Houston
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Paper Abstract

For type-II superlattices with spatially indirect optical transitions across the band gap, short-period superlattices are often employed. The oscillator strength of intraband transitions, from holes states confined in one layer to electron states confined in a neighboring layer, are enhanced by increasing the wave function overlap of these states through reduced superlattice period. However, there are limits to accurately controlling an epitaxially grown semiconductor superlattice structure as the number of monolayers in each layer is decreased. For InAs/GaSb type superlattices, periods of 40Å or less are relevant to mid-infrared detection. Characterization and modeling results for a series of InAs/GaSb superlattices with periods ranging 50Å to 20Å will be presented. These results explore the break point between when thinner is better and when reducing the period no longer optimizes the superlattice optical performance.

Paper Details

Date Published: 28 February 2006
PDF: 12 pages
Proc. SPIE 6127, Quantum Sensing and Nanophotonic Devices III, 61271I (28 February 2006); doi: 10.1117/12.666593
Show Author Affiliations
G. J. Brown, Air Force Research Lab. (United States)
H. J. Haugan, Air Force Research Lab. (United States)
F. Szmulowicz, Air Force Research Lab. (United States)
K. Mahalingam, Air Force Research Lab. (United States)
S. R. Munshi, Air Force Research Lab. (United States)
B. Ullrich, Air Force Research Lab. (United States)
S. Houston, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 6127:
Quantum Sensing and Nanophotonic Devices III
Manijeh Razeghi; Gail J. Brown, Editor(s)

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