Saturation of intraband absorption in a self-assembled double-quantum-dot molecule

Saturation absorption induced by interaction between the double-quantum-dot molecule and the intense-laser-field has been studied theoretically by using the effective mass and adiabatic approximations. Saturation absorption arising from the transition between bonding and antibonding states is strongly dependent on the dot-separation, the dot size and the incident light intensity. Absorption spectra appeared at THZ frequency-domain are bleached significantly and broadened under the high incident light intensity. Saturation intensities are of the order of MW/cm2 and the calculation results coincide with that of the experimental measurement. Finally, the influence of the relaxation time on the saturation absorption has been also studied.