Sol-Gel Processing and Optical Nonlinearity of Gold Colloid-Doped Silica Glass

Jun MATSUOKA; Ryoichi MIZUTANI; Syoji KANEKO; Hiroyuki NASU; Kanichi KAMIYA; Kohei KADONO; Toru SAKAGUCHI; Masaru MIYA

doi:10.2109/jcersj.101.53

Jun MATSUOKA, Ryoichi MIZUTANI, Syoji KANEKO, Hiroyuki NASU, Kanichi KAMIYA, Kohei KADONO, Toru SAKAGUCHI, Masaru MIYA

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Keywords: Au-doped glass, Third-order optical nonlinearity, Sol-gel method, Degenerate four-wave mixing, TEM, Crystal radius, Optical absorption, Heat treatment

JOURNAL FREE ACCESS

1993 Volume 101 Issue 1169 Pages 53-58

DOI https://doi.org/10.2109/jcersj.101.53

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Abstract

Au microcrystal-doped glass films with high optical nonlinearity were prepared by the sol-gel method with dip-coating using NaAuCl₄⋅2H₂O and tetraethyl orthosilicate (TEOS) as starting materials. The glass film with an Au/Si atomic ratio of 0.01 was successfully prepared. The nonlinear susceptibility χ⁽³⁾ of the film was 7.7×10^-9esu. Microcrystals with a radius of about 7Å and of about 30Å coexisted in the glass film. The nonlinear susceptibility of Au microcrystals itself in the film, χm⁽³⁾, was 1.0×10^-7esu and was two times larger than that observed in Au-doped glasses prepared by the melting method. Subsequent heat treatment of the films at 1000°C changed the absorption spectra and decreased χ⁽³⁾ by a factor of two. The atomic ratio of Au/Si was able to be increased to 0.04.

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