Intersubband optical properties of a two electron GaN/AlN constant total effective radius multi-shells quantum rings

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In this study, we have investigated the effect of the number of wells and quantum ring thickness on optical properties of a GaN/AlN two electron constant total effective radius multi-shells quantum rings (2e-CTER-MSQRs). We found that by using the number of wells and inner quantum ring radius complete wavefunction engineering is possible (localization of the wavefunction within a special region in the system). When inner quantum ring radius R0 or number of wells changes resonant energies of linear absorption coefficient do not undertake any red or blue shift. Thus, CTER-MSQRs are suitable systems when we want to manipulate the amplitude of the linear absorption coefficient or absolute value of the linear refractive index changes without any red or blue shift in the resonant energies. When number of wells increases the from 2 to 6, linear absorption coefficient and absolute value of the linear refractive index changes monotonically decreases by a factor close to two. Further increasing of the number of wells, from 6 to 12, leads to increasing of the linear absorption coefficient amplitude and absolute value of the linear refractive index changes by a factor close to three. Single quantum well 2e-CTER-MSQRs has maximum absorption among the studied systems. Finally, when inner ring radius R0 increases, linear absorption coefficient and absolute value of the linear refractive index changes monotonically decreases.