材料科学
纳米复合材料
表面等离子共振
德鲁德模型
银纳米粒子
吸收(声学)
纳米颗粒
折射率
波长
T矩阵法
等离子体子
光学
吸收光谱法
表面等离子体子
分子物理学
散射
纳米技术
复合材料
光电子学
化学
物理
作者
Jihye Kim,Geon Kook Lee,Inkyu Park,Young Ho Lee
标识
DOI:10.1166/jnn.2012.6330
摘要
The effects of the nanoparticle geometry and the host matrix on the optical properties of silver (Ag) nanocomposites were investigated. The spatial intensity distribution and absorption spectra were obtained by solving Maxwell equations using the finite-difference time-domain method. Local enhancement of the optical field was produced near the surface of the Ag nanoparticle. As the nanoparticle size increased, the plasmon-induced absorption increased and the surface plasmon resonance (SPR) wavelength of the Ag nanocomposite was redshifted. As the nanoparticle geometry was transformed from a sphere to an ellipsoid, two plasmon peaks appeared and their spectral spacing became larger with increasing the aspect ratio. The effects of the nanoparticle size and the anisotropic geometry on the optical properties of the Ag nanocomposites can be described by the Maxwell-Garnett theory and the Drude model. From the absorption spectra of the Ag nanocomposites with five different host matrices (SiO2, Al2O3, ZnO, ZrO2, and TiO2), it was found that the SPR wavelength of the Ag nanocomposite was redshifted with increasing the refractive index of the host matrix.
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