Plasmonic Manipulation of Color and Morphology of Single Silver Nanospheres
Plasmonic Manipulation of Color and Morphology of Single Silver Nanospheres
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DOI：
10.1021/nl302919n
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发表时间：
2012-10-01
期刊：
影响因子：
10.8
通讯作者：
Tatsuma, Tetsu
中科院分区：
文献类型：
--
作者：
Tanabe, Ichiro;Tatsuma, Tetsu
对金属纳米粒子的尺寸、形状或取向的光学控制对于纳米光学器件和光子电路元件的发展是重要的。然而，迄今为止，尚未实现两个或更多个参数的独立控制。在这里，我们将一个简单的球形Ag纳米粒子上的高折射率的TiO 2和分离的等离子体激元模式本地化的Ag-TiO 2界面从其他模式分布在纳米粒子。每个模式的选择性激发引起等离子体激元模式的相应形态变化和选择性抑制，导致散射光从橙子到红色、绿色或深色的快速变化。
Optical control of size, shape, or orientation of a metal nanoparticle is important for development of nanoscale optical devices and elements of photonic circuits. Thus far, however, independent control of two or more parameters has not yet been achieved. Here we place a simple spherical Ag nanoparticle on TiO2 with high refractive index and separate a plasmon mode localized at the Ag-TiO2 interface from the other mode distributed over the nanoparticle. Selective excitation of each mode gives rise to a corresponding morphological change and selective suppression of the plasmon mode, resulting in multicolor changes of scattering light from orange to red, green, or a dark color.