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Advances in OptoElectronics
Volume 2012, Article ID 368786, 6 pages
Research Article

The Performance of Active Coated Nanoparticles Based on Quantum-Dot Gain Media

1College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA
2Department of Electrical and Computer Engineering, University of Arizona, Tucson, AZ 85721, USA

Received 25 June 2012; Revised 21 August 2012; Accepted 25 August 2012

Academic Editor: Pavel A. Belov

Copyright © 2012 Sawyer D. Campbell and Richard W. Ziolkowski. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Quantum-dots (QDs) provide an exciting option for the gain media incorporated in active coated nanoparticles (CNPs) because they possess large gain coefficients resulting from their extreme confinement effects. The optical properties of core/shell QDs can be tuned by changing the relative size of the core/shell, that is, by effectively changing its band gap structure. Similarly, the resonance of a CNP can be adjusted by changing the relative sizes of its layers. It is demonstrated here that by optimally locating the QDs inside a resonant CNP structure it is possible to greatly enhance the intrinsic amplifying behavior of the combined QD-CNP system.