Generation In Asymmetric Quantum Wells Research Articles

The influence of permanent dipole moments on second harmonic generation in asymmetric semiconductor quantum wells

The influence of permanent dipole moments on intersubband double resonance second harmonic generation in asymmetric quantum wells is analyzed. It is found that in realistic QWs matched for 10.6 μm pump the permanent dipole moments may have modest to significant influence on the conversion efficiency, especially at higher pump powers. At longer wavelengths, however, their influence increases, and should be taken into account in modeling the device performance.

Influence of the depolarization effect on second-harmonic generation in asymmetric quantum wells

The effect of the depolarization field on the second-harmonic generation due to resonant intersubband transitions in asymmetric quantum wells is discussed. Calculations are performed in the framework of the perturbative density-matrix formulation with relaxation-time approximation. The results obtained show that in the near-double-resonant system the depolarization effect not only shifts the peak, in the second-harmonic-generation spectrum, but also changes its shape and enhances the maximum value.