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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Ultrahigh Enhancement of Electromagnetic Fields by Exciting Localized with Extended Surface Plasmons
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Ultrahigh Enhancement of Electromagnetic Fields by Exciting Localized with Extended Surface Plasmons

机译：通过激发局部扩展的表面等离激元来超高增强电磁场

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摘要

Excitation of localized surface plasmons (LSPs) of metal nanoparticles (NPs) residing on a flat metal film has attracted great attention recently due to the enhanced electromagnetic (EM) fields found to be higher than the case of NPs on a dielectric substrate. In the present work, it is shown that even much higher enhancement of EM fields is obtained by exciting the LSPs through extended surface plasmons (ESPs) generated at the metallic film surface using the Kretschmann-Raether configuration. We show that the largest EM field enhancement and the highest surface-enhanced fluorescence intensity are obtained when the incidence angle is the ESP resonance angle of the underlying metal film. The finite-difference time-domain simulations indicate that excitation of LSPs using ESPs can generate 1-3 orders higher EM field intensity than direct excitation of the LSPs using incidence from free space. The ultrahigh enhancement is attributed to the strong confinement of the ESP waves in the vertical direction. The drastically intensified EM fields are significant for highly sensitive refractive index sensing, surface-enhanced spectroscopies, and enhancing the efficiency of optoelectronic devices.
机译：由于发现增强的电磁（EM）场高于电介质基板上NP的情况，驻留在平坦金属膜上的金属纳米颗粒（NP）的局部表面等离子体激元（LSP）的励磁最近引起了极大的关注。在目前的工作中，表明通过使用Kretschmann-Raether构型通过在金属膜表面产生的扩展表面等离激元（ESP）激发LSP，可以获得更高的EM场增强。我们表明，当入射角为下面金属膜的ESP共振角时，可获得最大的EM场增强和最高的表面增强荧光强度。有限差分时域仿真表明，与使用自由空间入射的LSP直接激发相比，使用ESP激发LSP产生的电磁场强度要高1-3个数量级。超高增强归因于ESP波在垂直方向上的强约束。急剧增强的EM场对于高度敏感的折射率感应，表面增强的光谱学和提高光电器件的效率具有重要意义。

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