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Superlattices and Microstructures

Effect of incident light polarization on optical properties of an ellipsoidal quantum dot

Ebrahim Sadeghi, S. Alirezaie

Published Dec 5, 2012• 22 citations
Publisher
DOI
10.1016/j.spmi.2012.11.021

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Intersubband optical absorption coefficient and refractive index changes of a weakly prolate ellipsoidal quantum dot, using the compact-density matrix formalism and iterative method, are investigated. In this regard, the linear and nonlinear intersubband optical absorption coefficient and refractive index changes of a GaAs / Al x Ga 1-x As ellipsoidal quantum dot, as functions of the dot radius, ellipticity constant, stoichiometric ratio and incident light intensity are calculated. The results indicate that absorption coefficient and refractive index changes strongly depend on the light intensity, size and geometry of the dot and structure parameters such as aluminium concentration in GaAs / Al x Ga 1-x As structures.