Slab Thickness Dependence of Localized Surface Plasmon Resonance Behavior in Gold Nanorings
Slab Thickness Dependence of Localized Surface Plasmon Resonance Behavior in Gold Nanorings
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DOI：
10.1007/s11468-013-9503-4
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发表时间：
2013-02
期刊：
影响因子：
3
通讯作者：
Chia-Yang Tsai;Che-Yao Wu;Kainan Chang;Po-Tsung Lee
中科院分区：
文献类型：
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作者：
Chia-Yang Tsai;Che-Yao Wu;Kainan Chang;Po-Tsung Lee
本文对15 ~ 125 nm板材厚度的金纳米环（NR）阵列的等离子体动力学特性进行了详细的实验和数值研究。金核磁共振成键和反键模式的杂化等离子体共振在光学性质上表现出高度的板厚依赖性。对于厚度小于50 nm的薄板，两种混合模式都表现出较大的光谱可调性。此外，还研究了这种空心NR结构在减小板坯厚度时，内外环表面电场强度的增强情况。我们观察到反键模式的场分布发生了显著的转变。所有这些特征都可以通过模拟得到的表面电荷分布来理解。本研究结果为设计具有大场增强的复合等离子体纳米结构提供了一种潜在的策略，可用于多种应用。
We present detailed experimental and numerical studies of plasmonic properties of gold nanoring (NR) arrays with different slab thicknesses from 15 to 125 nm. The hybrid plasmon resonances for the bonding and antibonding modes in gold NRs exhibit a high slab thickness dependence behavior in optical properties. For the thinner slab thickness below 50 nm, both hybrid modes show large spectral tunabilities by varying the slab thickness. Furthermore, for such hollow NR structure, the enhancements of electric field intensities at the inner and outer ring surfaces when reducing the slab thickness are investigated. We observe a significant transition of field distributions for the antibonding mode. All these features can be understood by surface charge distributions from our simulations. The results of this study offer a potential strategy to design a composite plasmonic nanostructure with large field enhancement for numerous applications.