Overlayers on silver nanotriangles: Field confinement and spectral position of localized surface plasmon resonances
Overlayers on silver nanotriangles: Field confinement and spectral position of localized surface plasmon resonances
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DOI：
10.1021/nl060812e
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发表时间：
2006-08-09
期刊：
影响因子：
10.8
通讯作者：
Barnes, William L.
中科院分区：
文献类型：
--
作者：
Murray, W. Andrew;Suckling, James. R.;Barnes, William L.
我们研究了与银纳米三角形相关联的等离子体激元模式的光谱演化作为在5 - 300 nm范围内的电介质覆盖层厚度的函数。观察到的共振的大幅红移，随着增加的覆盖层厚度振荡。我们解释了这种以前未报道的振荡通过腔量子电动力学效应的三角形阵列相结合的电介质覆盖层。红移虽然很大，但比预期的要小。与数值模型的比较表明，这种差异是由于非常紧密的三角形的尖端周围的字段限制。
We studied the spectral evolution of plasmon modes associated with silver nanotriangles as a function of dielectric overlayer thickness in the range of 5 - 300 nm. A substantial red-shift of the resonance is observed that oscillates with increasing over-layer thickness. We explain this previously unreported oscillation through the cavity quantum electrodynamical effect of the array of triangles combined with the dielectric overlayer. The red-shift, though substantial, is less than expected. Comparison with numerical models indicates that this discrepancy is due to very tight field confinement around the tips of the triangles.