Au/誘導体複合薄膜のフェムト秒非線形光学特性に及ぼす誘導体マトリックスの効果

概要

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Third-order optical nonlinearities in three types of Au/dielectric composite thin films (Au/SiO_2, Au/Al_2O_3, and Au/Ti0_2 films) with high concentrations (〜27 at.%) of Au particles (5.6-16.8 nm in diameter) have been investigated by means of Z-scan and pump-probe techniques in the femtosecond time region. In the optical-absorption spectra of the films, the absorption peak of the surface plasmon resonance (SPR) of Au particles was clearly observed. The peak was shifted toward a longer wavelength with increasing the refractive index of the dielectric matrices. Near the SPR peak, the imaginary part of the third-order nonlinear susceptibility, {Im[x^<(3)>]}/α, of the Au/SiO_2, Au/Al_2O_3, and Au/TiO_2 films increased in that order, due to the local field enhancement.
社団法人日本セラミックス協会の論文
2003-04-01