Ahn B, Schötz J, Okell W A, Süßmann F, Förg B, Kim S C, Kling M F, Kim D
Opt Express. 2016 Jan 11;24(1):92-101. doi: 10.1364/OE.24.000092.
We theoretically analyze a method for characterizing propagating surface plasmon polaritons (SPPs) on a thin gold film. The SPPs are excited by few-cycle near-infrared pulses using Kretschmann coupling, and a nanotip is used as a local field sensor. This geometry removes the influence of the incident excitation laser from the near fields, and enhances the plasmon electric field strength. Using finite-difference-time-domain studies we show that the geometry can be used to measure SPP waveforms as a function of propagation distance. The effects of the nanotip shape and material on the field enhancement and plasmonic response are discussed.
我们从理论上分析了一种表征薄金膜上传播表面等离激元极化激元（SPP）的方法。利用Kretschmann耦合，用少周期近红外脉冲激发SPP，并使用纳米尖端作为局部场传感器。这种几何结构消除了入射激发激光对近场的影响，并增强了等离子体电场强度。通过时域有限差分研究，我们表明这种几何结构可用于测量作为传播距离函数的SPP波形。讨论了纳米尖端形状和材料对场增强和等离子体响应的影响。
