Influence of external probes on the nonlinear optical characteristics of a GaAs/AlGaAs quantum well with an anharmonic potential

The optical characteristics of GaAs/AlGaAs double anharmonic oscillator potentials are investigated across various quantum well parameters and applied electromagnetic probes, including electric field, magnetic field, and intense laser field (α₀). The study employs the effective mass approximation and diagonalization method to determine the band alignment of the structure and solve the one-dimensional time-independent Schrödinger equation. Intersubband energies, total optical absorption coefficients (TOACs), and total relative refractive index changes (RRICs) are numerically evaluated under the influence of the structural parameters and the applied external electric field. Structural parameters and applied electric fields induce separations in energy levels and variations in dipole moment matrix elements, leading to shifts in resonant peaks. It is demonstrated that alterations in structural parameters and external electric fields result in either red or blue shifts in the resonant peak positions of TOAC and RRIC coefficients.