Effect of Size on the Saturable Absorption and Reverse Saturable Absorption in Silver Nanoparticle and Ultrafast Dynamics at 400 nm

Figure 5

Schematic of the energy level diagram and electronic excitation for Ag NPs [25]. The equal population in the lower and upper electronic states represents the absorption saturation represented by black circular dots. The blue-colored upward arrow represents excitation using 400 nm (3.1 eV) whereas the red-colored upward arrow represents 800 nm (1.55 eV) excitation. corresponds to the energy associated with the Fermi level in cm^-1.