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
Özet
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.