Plasmon–plasmon coupling probed by ultrafast, strong-field photoemission with <7 Å sensitivity,Nanoscale

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Plasmon–plasmon coupling probed by ultrafast, strong-field photoemission with <7 Å sensitivity
Nanoscale ( IF 5.8 ) Pub Date : 2018-08-08 00:00:00 , DOI: 10.1039/c8nr04242j
Judit Budai _{1,

2,

3,

4,

5} , Zsuzsanna Pápa _{1,

2,

3,

4,

6} , István Márton _{4,

6,

7,

8} , Piotr Wróbel _{9,

10,

11,

12} , Tomasz Stefaniuk _{9,

10,

11,

12} , Zsuzsanna Márton _{1,

2,

3,

4,

13} , Péter Rácz _{4,

6,

7,

8} , Péter Dombi _{1,

2,

3,

4,

6}

Affiliation

The coupling of propagating surface plasmon waves and localized plasmon oscillations in nanostructures is an essential phenomenon determining electromagnetic field enhancement on the nanoscale. Here, we use our recently developed ultrafast photoemission near-field probing technique to investigate the fundamental question of plasmon–plasmon coupling and its effect on large field enhancement factors. By measuring and analyzing plasmon field enhancement values at different nanostructured surfaces, we can separate the contributions from propagating and localized plasmons. When resonance conditions are met, a significant field enhancement factor can be attributed to the generation of localized plasmons on surface nanostructures, acting as dipole sources resonantly driven by the propagating plasmon field. Our plasmon–plasmon coupling results can contribute directly to applications in surface-enhanced Raman scattering (SERS) and the development of plasmonic sensors and nanostructured photocathodes.

中文翻译：

等离子-等离激元耦合通过超快，强场光发射探测，灵敏度<7Å

纳米结构中传播的表面等离激元波与局部等离激元振荡的耦合是决定纳米级电磁场增强的重要现象。在这里，我们使用我们最近开发的超快光发射近场探测技术来研究等离激元-等离激元耦合的基本问题及其对大场增强因子的影响。通过测量和分析不同纳米结构表面上的等离激元场增强值，我们可以从传播的和局部的等离激元中分离出贡献。当满足共振条件时，重要的场增强因子可归因于表面纳米结构上局部等离激元的产生，它们是由传播的等离激元场共振驱动的偶极子源。

更新日期：2018-08-08

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