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Quantum box fabrication tolerance and size limits in semiconductors and their effect on optical gain

Vahala, Kerry J. (1988) Quantum box fabrication tolerance and size limits in semiconductors and their effect on optical gain. IEEE Journal of Quantum Electronics, 24 (3). pp. 523-530. ISSN 0018-9197. http://resolver.caltech.edu/CaltechAUTHORS:VAHieeejqe88

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Abstract

Lower and upper limits on size are established for quantum boxes. The lower limit is shown to result from a critical size below which bound electronic states no longer exist. This critical size is different for electrons and holes. The optical gain of arrays of quantum boxes is computed taking into account the inhomogenous broadening of the gain spectrum resulting from fabricational variations in quantum box size and shape. The dependence of maximum possible gain on an rms quantum box roughness amplitude is determined. For high gain operation a medium composed of quantum boxes does not offer significant advantages over a conventional bulk semiconductor unless quantum box fabricational tolerances are tightly controlled. For low gain operation, however, arrays of quantum boxes may offer the unique advantage of optical transparency at zero excitation. This property does not require excellent fabricational control and may make possible ultralow threshold semiconductor lasers and low noise optical amplifiers.


Item Type:Article
Additional Information:© Copyright 1988 IEEE. Reprinted with permission. Manuscript received June 4, 1987; revised October 12, 1987. This work was supported in part by the National Science Foundation and by the U.S. Office of Naval Research.
Record Number:CaltechAUTHORS:VAHieeejqe88
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:VAHieeejqe88
Alternative URL:http://dx.doi.org/10.1109/3.157
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9574
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:05 Feb 2008
Last Modified:26 Dec 2012 09:50

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