Dynamics of nonlinear optical rectification, second, and third harmonic generation in asymmetric triangular double quantum wells due to static electric and magnetic fields
Abstract
In this study, we present a theoretical simulation of the impact of applied external electric and magnetic fields on
the nonlinear optical rectification (NOR), second harmonic generation (SHG), and third harmonic generation (THG) in typical
GaAs/Ga0.6 Al0.4 As asymmetric double triangular quantum wells. At first, we have calculated the wave functions and the subband
energy levels for the lowest bounded four states confined within the structure by solving the Schrödinger equation using the
diagonalization method within the framework of the effective mass and single parabolic band approximations. Then, the analytical
expressions of the NOR, SHG, and THG are obtained using compact density matrix approach via iterative method. According to
the numerical results, it is concluded that electric and magnetic fields play a vital and important role in the electronic and optical
properties of the system and they can be used to adjust the intersubband transitions and change the associated optical sensitivities.