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Third‐order nonlinear absorption spectra of an impurity in a spherical quantum dot with different confining potential
Author(s) -
Yılmaz S.,
Şahin M.
Publication year - 2010
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200945491
Subject(s) - quantum dot , absorption spectroscopy , wave function , attenuation coefficient , absorption (acoustics) , molecular physics , atomic physics , physics , condensed matter physics , quantum mechanics , optics
Abstract In this study, the linear and third‐order nonlinear optical absorption coefficients of intersublevel transitions have been calculated for a spherical CdS/SiO 2 quantum dot (QD) with infinite and different finite confining potential by using the density matrix formalism. The electron eigenenergies and the corresponding wavefunctions have been determined by the variational method under the effective mass approximation. We have investigated the effects of the incident optical intensity, QD radius, and confinement potential on the intersublevel optical absorption coefficients. It is found that the size of the dot and depth of the confinement have a great effect on the linear, the nonlinear, and the total absorption coefficients. Also, the total optical absorption saturation intensity is controlled by the strength of the confinement or the incident optical intensity.