Au 微粒子分散SrTiO_3薄膜の作製とその光学特性

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Gold-dispersed SrTiO_3 thin films were prepared by the r.f.magnetron sputtering method. The as-deposited films were heat-treated in air at temperatures ranging from 700 to 900℃ for 1h. The optical properties of the films were compared with those of gold-dispersed BaTiO_3 and gold-dispersed SiO_2 thin films, which were prepared by the same procedure as gold-dispersed SrTiO_3 thin films. The SrTiO_3 matrix crystallized at temperatures above 700℃ and fine gold particles became coarse between 800 and 900℃. For the SrTiO_3 matrix, the peak position of the surface plasmon resonance of gold particles shifted toward the longer wavelength as the volume fraction of gold and heat treatment temperature increased. The changes of the absorption peak position of the gold-dispersed SrTiO_3 thin films were similar to those of gold-dispersed BaTiO_3 thin films. Nonlinear optical property of these films was measured by the degenetate four-wave mixing(DFWM)method at 532 nm using a Q-switched Nd:YAG laser with 7-ns pulse duration. The values of χ^<(3)>/α_<532> of the gold-dispersed SrTiO_3 thin films were tentimes larger than those of the gold-dispersed SiO_2 thin films. In the case of SiO_2 matrix, enlargement of χ^<(3)>/α_<532> in accordance with enlargement of particle size of gold originate from an increase of f_1 due to decreasing ε_m″ of gold particles. On the other hand, for the SrTiO_3 and BaTiO_3 matrices, refractive indices of the matrices increase with increasing heat treatment temperature. The enlargement of refractive index(n_s)or dielectric constant(ε_f)of the films attribute to the enlargement of χ^<(3)>/α_<532> of gold-dispersed SrTiO_3 and BaTiO_3 thin films besides the enlargement of particle size of gold. In contrast, the nonlinear susceptibility of the gold particles, χ_m^<(3)>in the gold-dispersed SrTiO_3 and BaTiO_3 thin films decreased with increasing mean particle size.
社団法人日本セラミックス協会の論文
1995-02-01

Au 微粒子分散SrTiO_3薄膜の作製とその光学特性

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