Effect of Razavy potential well parameters on the optical rectification, second, and third harmonic generation coefficients of Razavy quantum well in the presence of electric, magnetic, and THz laser fields

Abstract

The paper presents the nonlinear optical rectification, second and third harmonic generation properties of a quantum well-formed within AlGaAs/GaAs heterostructures under the Razavy potential function. The effects of well parameters as well as applied external fields such as electric, magnetic, and non-resonant intense laser on these parameters are examined. The energies of sub-bands and dipole moment matrix elements related to wave function probabilities are obtained by solving the Schrödinger equation within effective mass and parabolic band approximations. Optical coefficients are calculated in the framework of the density matrix approach. The findings point out that the potential distribution parameters strongly affect the magnitudes as well as the locations of nonlinear optical rectification, second and third harmonic generation peaks on the corresponding incident photon energies. Besides the influences of potential parameters, subjecting the system to intense laser field leads noticeable changes on the NOR, SHG, and THG coefficients. However the changes on these properties are quite slight when the system subjected to the external electric or magnetic field. Razavy potential parameters are more effective in controlling the optical properties in comparison to the electric and magnetic field perturbations.