Guided plasmonic modes in nanorod assemblies: strong electromagnetic coupling regime.
Guided plasmonic modes in nanorod assemblies: strong electromagnetic coupling regime.
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DOI：
10.1364/oe.16.007460
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发表时间：
2008-05
期刊：
影响因子：
3.8
通讯作者：
G. Wurtz;W. Dickson;Daniel T. O'Connor;R. Atkinson;W. Hendren;P. Evans;Robert Pollard;Anatoly V. Zayats
中科院分区：
文献类型：
--
作者：
G. Wurtz;W. Dickson;Daniel T. O'Connor;R. Atkinson;W. Hendren;P. Evans;Robert Pollard;Anatoly V. Zayats
我们证明了定向金属纳米棒的等离子体激元模式之间的耦合导致纳米棒阵列的扩展（引导）等离子体激元模式的形成。发现与该模式相关联的电磁场分布集中在组装件内的纳米棒之间，并且垂直于纳米棒长轴传播，类似于由各向异性板波导的光子模式。这种集体等离子体激元模式决定了纳米棒组件的光学性质，并且可以通过改变纳米棒阵列的几何形状在宽光谱范围内进行调谐。这种几何形状代表了纳米级的光导应用和操纵以及分子等离子体器件的传感应用和开发的独特机会。
We demonstrate that the coupling between plasmonic modes of oriented metallic nanorods results in the formation of an extended (guided) plasmonic mode of the nanorod array. The electromagnetic field distribution associated to this mode is found to be concentrated between the nanorods within the assembly and propagates normally to the nanorod long axes, similar to a photonic mode waveguided by an anisotropic slab. This collective plasmonic mode determines the optical properties of nanorod assemblies and can be tuned in a wide spectral range by changing the nanorod array geometry. This geometry represents a unique opportunity for light guiding applications and manipulation at the nanoscale as well as sensing applications and development of molecular plasmonic devices.