NONLINEAR-OPTICAL RECTIFICATION IN THE ELECTRIC-FIELD-BIASED PARABOLIC QUANTUM DOTS

We report the calculations of the second-order optical susceptibility- nonlinear optical rectification chi0(2) of the electric-field-biased G aAs parabolic quantum dots. The large nonlinear optical rectification chi0(2) obtained in the electric-field-biased parabolic quantum dots i s mainly due to the possibility of tuning independently the parabolic confinement frequency omega0, the biased electric field F and the angl es (theta and phi). The value of chi0(2) increases with increasing ele ctric field F, decreases with increasing the parabolic confinement fre quency omega0, and depends on the direction of the electric field (the ta and phi). Comparing with the results obtained in a Q2D system, we s how that, as the electronic confinement is increased with the reductio n of the dimensionality, the nonlinear optical rectification will be m ore pronounced.