Knight Mark W, Grady Nathaniel K, Bardhan Rizia, Hao Feng, Nordlander Peter, Halas Naomi J
Department of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University, 6100 Main Street, Houston, Texas 77005, USA.
Nano Lett. 2007 Aug;7(8):2346-50. doi: 10.1021/nl071001t. Epub 2007 Jul 13.
We show that a nanoparticle can serve as an efficient antenna for coupling of visible light into propagating plasmons of an Ag nanowire. For long wires, the coupling is maximal for incident light polarized perpendicular to the nanowire. For sub-10-mum nanowires, the polarization corresponding to maximum emission from the ends of the nanowire was found to be strongly dependent on the nanowire geometry and position of the vicinal nanoparticle. This nanoparticle antenna-based approach offers a potential strategy for optimizing plasmon coupling into nanoscale metallic waveguides.
我们表明，纳米粒子可作为一种高效天线，用于将可见光耦合到银纳米线的传播等离激元中。对于长纳米线，当入射光偏振方向垂直于纳米线时，耦合效果最佳。对于长度小于10微米的纳米线，发现纳米线末端最大发射对应的偏振强烈依赖于纳米线的几何形状和邻近纳米粒子的位置。这种基于纳米粒子天线的方法为优化等离激元耦合到纳米级金属波导中提供了一种潜在策略。
