Abstract
Au and Cu ions implanted in Corning 7940 glass and fused silica form metallic nanoclusters exhibiting a large third-order optical nonlinearity. The sign and magnitude of all components of χ(3) were measured for linearly and circularly polarized picosecond laser pulses at wavelengths near the surface plasmon resonance, by using both Z-scan and degenerate four wave mixing techniques. The data show that clusters over ~30 Å diameter retain bulk crystalline structure with a cubic class m3m symmetry. For smaller clusters χ(3) has isotropic symmetry. The nonlinear index of refraction is size dependent for clusters with crystalline structure; for the smaller clusters, the size dependence is not so apparent. Detailed analysis of the results shows that the main contribution to χ(3) arises from hot electrons and interband transitions.
© 1992 Optical Society of America
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