Control on Surface Plasmon Polaritons Propagation Properties by Continuously Moving a Nanoparticle along a Silver Nanowire Waveguide.
Control on Surface Plasmon Polaritons Propagation Properties by Continuously Moving a Nanoparticle along a Silver Nanowire Waveguide.
复制标题
通过沿银纳米线波导连续移动纳米粒子来控制表面等离子体激元极化子传播特性
DOI：
10.1038/srep37512
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发表时间：
2016-11-22
影响因子：
4.6
通讯作者：
Li F
中科院分区：
文献类型：
--
作者：
Wu F;Wang W;Hua J;Xu Z;Li F
基于表面等离子体激元(SPPs)的纳米线波导在纳米光子电路中具有潜在的应用前景。因此，精确控制表面等离子体激活剂在金属纳米线中的传播具有重要意义。在这项工作中，我们报道了通过沿银纳米线(AgNW)移动银纳米颗粒(AgNP)来控制表面等离子体激元的传播特性。随着激发端到Np距离的增加，Np处的发射强度可以衰减到最大发射值的25%左右。当Np逐渐远离激发端时，Ag Np处的发射光强度呈现指数衰减，呈现波状叠加，而NW端的发射几乎为恒定值。结果表明，前者与NW上的局域SPPS场分布有关，后者与激发端到NW端的距离有关。此外，还研究了AgNp-NW结构中的传输损耗。我们的实验证明了纳米粒子的位置在基于纳米波的光波导中的重要作用，并提供了一种有效的方法来调谐纳米波中的散射光，这对设计基于表面等离子体激元的纳米光子电路和器件的未来的专门功能具有指导意义。
Surface plasmon polaritons (SPPs)-based nanowire waveguides possess potential applications for nanophotonic circuits. Precise control on the propagation of SPPs in metal nanowires is thus of significant importance. In this work, we report the control on SPPs propagation properties by moving a silver nanoparticle (Ag NP) along a silver nanowire (Ag NW). The emission intensity at NP can be attenuated to about 25% of the maximum emission value with increasing the distance between excitation end and NP. When NP is gradually moved away from excitation end, the intensity of emission light at Ag NP shows an exponential decay with a superposition of wavy appearance, while the emission at NW end is almost a constant value. It is found that the former is related to the local SPPs field distribution in NW, and the latter is dependent on the distance between excitation end and NW terminal. Moreover, the propagation loss in Ag NP-NW structure has been investigated. Our experiments demonstrate the important role of NP location in NW-based waveguides and provide an effective method of tuning scattering light in NW, which is instructive to design the future specialized function of SPPs-based nanophotonic circuits and devices.