Figure 11.

(a) The CA z-scan measurements of the Ag/Au NP sample at various incident powers ranged from 0.6 to 1.2 mW at a constant excitation wavelength of 800 nm. The symbols correspond to the experimental data, and the solid curves represent the fits obtained using Equations (2) and (3). (b) The deduced n₂ values of the Ag/Au NPs sample as a function of incident laser power at an excitation wavelength of 800 nm. The dots represent the experimental data, and the solid line represents the linear fit.