Table 1.

Shows the NLO parameters of metal NPs at an 800 nm excitation wavelength and an incident average power of 1 W. The n₂ represents the nonlinear refractive index of NPs colloids, n₀ is the linear refractive index, and γ is the 3PA coefficient.

Metal NPs	n0	n2 × 10−15 (cm2/W)	γ × 10−19 (cm3/W2)
Ag	2.06	5.82	0.72
Au	4.69	6.19	1.42
Ag–Au	1.96	6.43	1.71