Effect of band nonparabolicity and material composition on intersubband transition energies of a heterostructure quantum ring for optical transmitter

Intersubband transition energies of a semiconductor heterostructure quantum ring with cylindrical geometry are computed considering three lowest eigenstates. Band nonparabolicity is considered to observe the change in transition energy compared with parabolic band, as well as material composition of the heterostructure is varied taking AlxGa1-xAs as an example. Electric field is applied along the axis of the structure. Time-independent Schrödinger equation is solved with appropriate boundary conditions, and first and second order Bessel functions are considered for computation of energy subbands. Quantized electron energy states have been observed by changing different dimensions of the ring structure. Precise tailoring of dimension and material composition for helps to obtain required emission and absorption spectra, making it a potential candidate for novel photonic applications.