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Impact of Propagative Surface Plasmon Polaritons on the Electromagnetic Enhancement by Localized Gap Surface Plasmons Between Metallic Nanoparticles and Substrate

机译：繁殖表面等离子体极化膜对金属纳米粒子和基材局部间隙表面等离子体电磁增强的影响

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The nanoparticle-on-mirror system as a surface-enhanced Raman scattering substrate is sufficient for single molecule detection and possesses advantages of high reproducibility and ease of assembly. In this paper, one single spherical gold nanoparticle (NP) placed on a flat gold substrate with a gap size of 10 nm is firstly studied. Then, two NPs with separations in order of wavelengths is investigated. The enhanced field of the localized gap surface plasmon (LGSP) in the NP-substrate nanogap is analyzed quantitatively with the finite element method, and a simplified model is proposed to describe the impact of the propagative surface plasmon polariton (SPP) on the LGSP. A 34% improvement of the enhancement factor of the Raman signal is achieved compared to a single NP. The field distribution of SPPs is found to play an important role in determining the optimal positions of NPs to generate the strongest hot spots. Then, the case of a single NP or a NP doublet in a gold groove is considered, and an 8.22-fold increase of the enhancement factor of the Raman signal is obtained compared to the case without the groove. The interference among the groove-excited SPPs, the NP-excited SPPs, and the LGSP determines the optimal positions of the NPs in the groove to generate the strongest hot spots. The present work reveals the great impact of the propagative SPPs on the field enhancement of the LGSP in the NP-substrate gap, and provides a theoretical basis for generating multiple strong hot spots by arranging NPs' positions according to the field distribution of the propagative SPPs.
机译：作为表面增强拉曼散射基板的纳米颗粒 - 镜面系统足以单分子检测，并且具有高再现性和容易性的优点。本文首先研究了置于扁平金基底上的单个球形金纳米粒子（NP），其具有间隙尺寸为10nm。然后，研究了一个具有波长顺序分离的两个NPS。数量地利用有限元方法定量分析NP衬底纳米隙中的局部间隙表面等离子体（LGSP）的增强场，并且提出了一种简化的模型来描述在LGSP上的传播表面等离子体Polariton（SPP）的影响。与单个NP相比，实现了拉曼信号的增强因子的34％改善。发现SPP的现场分布在确定NPS产生最强的热点的最佳位置时起着重要作用。然后，考虑在金槽中的单个NP或NP双板的情况，与没有凹槽的情况相比，获得拉曼信号的增强因子的8.22倍的增加。凹槽激励的SPPS，NP激发SPP和LGSP之间的干扰确定槽中的NP的最佳位置，以产生最强的热点。目前的工作揭示了传播SPP对NP - 衬底间隙中LGSP的现场增强的影响，为通过根据传播SPP的场分布布置NPS的位置来提供多个强热点的理论依据。

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