Third-harmonic generation in asymmetric coupled quantum wells

Abstract

The third-harmonic generation (THG) in asymmetric coupled quantum wells (ACQWs) for different values of the well parameter Δ and width of barrier ( W B ) are theoretically studied. The analytical expression of the third-harmonic generation is derived by using the compact density-matrix approach and the iterative method. Finally, the numerical calculations are presented for typical GaAs/Al x Ga 1− x As asymmetric coupled quantum wells. Results obtained show that the third-harmonic generation in the asymmetric coupled quantum wells can be importantly modified by the parameter Δ and W B . Moreover, third-harmonic generation also depends on the relaxation rate of the asymmetric coupled quantum wells.