Linear and Nonlinear Optical Properties of ZnO/MgO Core/Shell and Inverted Core/Shell Quantum Dots
Journal of Advanced Physics, 6 (4):
477-481 (Dezember 2017)DOI: 10.1166/jap.2017.1361
Zusammenfassung
In the present work we have performed a theoretical study of the linear and nonlinear absorption coefficients as well as the refractive index changes for the intersubband transitions in ZnO/MgO core shell (CSQD) and MgO/ZnO inverted core shell quantum dots (ICSQD). All calculations,
have been carried out in the framework of the effective mass approximation (EMA) with the help of the potential morphing method (PMM). The investigation is focused on the influence of the shell thickness, impurity position and dielectric environment on the aforementioned properties. Our results,
indicate a redshift of the threshold energy as we increase the shell thickness. A similar behavior is obtained (for CSQDs) by moving the impurity from core to shell region regardless of the presence (or not) of a dielectric environment. However, for ICSQDs the behavior appears to be non monotonic.,
Although the system exhibits peak enhancement in the overall optical properties when the dot is embedded in SiO2, the non-linear part appears to be vanishingly small.",
Beschreibung
Linear and Nonlinear Optical Properties of ZnO/MgO Core/Shell and Inverted Core/Shell Quantum Dots