Au microcrystal-doped glass films with high optical nonlinearity were prepared by the sol-gel method with dip-coating using NaAuCl4•E2H2O and tetraethyl or thosilicate (TEOS) as starting materials. The glass film with an Au/Si atomic ratio of 0.01 was successful ly prepared. The nonlinear susceptibility ƒÔ(3) of the film was 7.7•~10-9esu. Microcrystals with a radius of about 7A and of about 30A coexisted in the glass film. The nonlinear susceptibility of Au microcrystals itself in the film, ƒÔm(3), was 1.0•~10-7esu and was two times larger than that observed in Au-doped glasses pre pared by the melting method. Subsequent heat treat ment of the films at 1000•Ž changed the absorption spectra and decreased ƒÔ(3) by a factor of two. The atom ic ratio of Au/Si was able to be increased to 0.04.
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