Figure 2From: Excitonic effects on the second-order nonlinear optical properties of semi-spherical quantum dots The OR coefficient as a functions of the incident photon energy ħω for (a) ω 0 = 1 × 10 13 s -1 and (b) ω 0 = 2 × 10 14 s -1 , considering excitonic effects with (red line) and without Coulomb (black line)interaction. The blue line corresponds to the case without excitonic effects.Back to article page