Wurtz G A, Dickson W, O'Connor D, Atkinson R, Hendren W, Evans P, Pollard R, Zayats A V
Centre for Nanostructured Media, IRCEP, The Queen's University of Belfast, Belfast, BT7 1NN, United Kingdom.
Opt Express. 2008 May 12;16(10):7460-70. doi: 10.1364/oe.16.007460.
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.
我们证明，取向金属纳米棒的等离子体模式之间的耦合导致纳米棒阵列形成扩展（引导）等离子体模式。发现与该模式相关的电磁场分布集中在组件内的纳米棒之间，并垂直于纳米棒长轴传播，类似于由各向异性平板波导的光子模式。这种集体等离子体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很宽的光谱范围内进行调谐。这种几何形状为纳米尺度的光导应用和操纵以及传感应用和分子等离子体器件的开发提供了独特的机会。
