Plasmon modes in single gold nanodiscs
Plasmon modes in single gold nanodiscs
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DOI：
10.1364/oe.22.012189
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发表时间：
2014-05-19
期刊：
影响因子：
3.8
通讯作者：
Papoff, F.
中科院分区：
文献类型：
--
作者：
Imura, K.;Ueno, K.;Papoff, F.
利用扫描近场光学显微镜研究了单个金纳米盘的光学性质。单个纳米盘的近场透射光谱在可见光到近红外区域表现出多个等离子体共振。在这些共振波长下观察到的近场透射图像显示出取决于观察波长的波浪状空间特征。为了阐明图像的物理图像，进行了基于盘内外电磁基模之间的空间相关性的理论模拟。模拟图像再现了所观察到的光盘中激发的空间结构。模拟图像的模式分析表明，在透射图像中观察到的空间特征主要来自光盘的几个基本的等离子体振子模式。(C)2014年美国光学学会
Optical properties of single gold nanodiscs were studied by scanning near-field optical microscopy. Near-field transmission spectra of a single nanodisc exhibited multiple plasmon resonances in the visible to near-infrared region. Near-field transmission images observed at these resonance wavelengths show wavy spatial features depending on the wavelength of observation. To clarify physical pictures of the images, theoretical simulations based on spatial correlation between electromagnetic fundamental modes inside and outside of the disc were performed. Simulated images reproduced the observed spatial structures excited in the disc. Mode-analysis of the simulated images indicates that the spatial features observed in the transmission images originate mainly from a few fundamental plasmon modes of the disc. (C) 2014 Optical Society of America