期刊
SUPERLATTICES AND MICROSTRUCTURES
卷 48, 期 2, 页码 239-247出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.spmi.2010.04.015
关键词
Quantum dot; Nonlinear optics
资金
- National Natural Science Foundation of China [10775035]
Optical absorption coefficients and refractive index changes associated with intersubband transition of an off-center hydrogenic impurity in a spherical quantum dot (QD) with Gaussian confinement potential are theoretically investigated. Our results show that the optical absorption coefficients in a spherical QD are 2-3 orders of magnitude higher than those in quantum wells and are 2-3 orders smaller than those in a disk-like QD. It is found that the optical absorptions and the optical refractive index are strongly affected not only by the confinement barrier height, dot radius but also by the position of the impurity. (C) 2010 Elsevier Ltd. All rights reserved.
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