Optical absorption coefficint of GaN/AlN multi-shells quantum dots: Optical intensity and magnetic field effects

In this work we have studied effect of the optical intensity, magnetic field, number of wells and quantum dot radius on optical properties of an AlN/GaN constant outer radius multi-shells quantum dots. We have shown that, by increasing of the intensity the total absorption coefficient decreases. Higher magnetic fields and smaller outer quantum dot radiuses lead to the more rapidly decrease of the third order absorption coefficients when the number of wells increases. In systems with smaller outer quantum dot radiuses, the third order absorption coefficient more rapidly decreases. The absorption coefficient of the systems with more number of wells grows more slowly than that of systems with fewer numbers of wells. But, the absorption coefficient of the systems at higher magnetic fields grows less slowly than that of systems at lower magnetic fields. Finally, these results can help experimentalists to fabricate their optical devices more easily since they can now have a deeper physical insight when they changes magnetic field values, number of wells and outer quantum dot radiuses. This is because; by using of these parameters they can produce systems with high or low absorptions and high or low nonlinearities.