Nonlinear optical properties of Cu nanoclusters by ion implantation in silicate glass

Abstract

Metal nanocluster composite glass prepared by 180 keV Cu ions into silica with dose of 1 × 10 17 ions/cm 2 has been studied. The microstructural properties of the nanoclusters were analysed by optical absorption spectra and transmission electron microscopy (TEM). Third-order nonlinear optical properties of the nanoclusters were measured at 1064 nm and 532 nm excitations using Z-scan technique. The nonlinear refraction index, nonlinear absorption coefficient, and the real and imaginary parts of the third-order nonlinear susceptibility were deduced. The mechanisms responsible for the nonlinear response were discussed. Absolute third-order nonlinear susceptibility χ ( 3 ) of this kind of sample was determined to be 2.1 × 10 −7 esu at 532 nm and 1.2 × 10 −7 esu at 1064 nm, respectively.