Abstract
We report here the realization of large third-order nonlinear susceptibility, χ(3) from Au:dielectric (Si02 and TiO2) composite films near the An percolation threshold. The composite films were prepared by co-sputtering onto a fused silica substrate (dimension of 0.5 in. × 3 in.) with a continuous variation of Au composition from 4% Au-70% Au. After the deposition, the films were annealed in a rapid thermal annealing furnace at 850°C for 1 min to form Au clusters in dielectric matrix (see Ref. 1 for details). The most striking changes induced by annealing in the films are their colors and electrical conductivity (changes from insulating to conducting at 60% Au).
© 1998 Optical Society of America
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