蒸発凝縮法によるナノサイズ粒子からなる銀薄膜の作製とその線形及び非線形光学特性

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  • Preparation of Silver Thin Films Consisting of Nano-Sized Particles by the Evaporation-Condensation Method and Its Linear and Nonlinear Optical Properties
  • ジョウハツ ギョウシュクホウ ニ ヨル ナノサイズ リュウシ カラ ナル ギン ハクマク ノ サクセイ ト ソノ センケイ オヨビ ヒセンケイ コウガク トクセイ

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Silver particles generated by the evaporation-condensation method were deposited to form a film on a silica glass substrate. The films thus obtained consist of nano-sized silver particles. Nonlinear refractive index, γ and nonlinear absorption coefficient, β determined by using Z-scan technique were both negative, while γ in the literatures for the silver particles-dispersed-glass composites was positive. The absolute value of γ for the as-deposited samples was increased as absorption peak wavelength due to surface plasmon resonance became close to the laser wavelength used in the measurement. The particle size (D) dependence, especially D-3 dependence of γ was clearly observed for the films which were prepared at different particle generation temperatures and annealed at 170°C, and consisted of particles of 26 to 46 nm in size. This dependence was explained in terms of the quantum confinement effect.<br>

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