Raman scattering and fluorescence spectroscopy permeate analytic science and are featured in the plasmon-enhanced spectroscopy (PES) family. However, the modest enhancement of plasmon-enhanced fluorescence (PEF) significantly limits the sensitivity in surface analysis and material characterization. Herein, we report a Ag nanoantenna platform, which simultaneously fulfills very strong emission (an optimum average enhancement of 10⁵-fold) and an ultrafast emission rate (∼280-fold) in PES. For applications in surface science, this platform has been examined with a diverse array of fluorophores. Meanwhile, we utilized a finite-element method (FEM) and time-dependent density functional theory (TD-DFT) to comprehensively investigate the mechanism of largely enhanced radiative decay. PES with a shell-isolated Ag nanoantenna will open a wealth of advanced scenarios for ultrasensitive surface analysis.

中文翻译：

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使用银纳米天线进行等离子体增强的超灵敏表面分析

拉曼散射和荧光光谱法渗透到分析科学领域，并在等离激元增强光谱法（PES）系列中具有特色。但是，等离激元增强荧光（PEF）的适度增强显着限制了表面分析和材料表征的灵敏度。在此，我们报告了一个Ag纳米天线平台，该平台可同时实现非常强的发射（最佳平均增强10 ⁵倍）和超快发射速率（约280倍）。对于表面科学中的应用，已经对该平台进行了各种荧光团检测。同时，我们利用有限元方法（FEM）和时变密度泛函理论（TD-DFT）来全面研究辐射衰减大大增强的机理。具有外壳隔离的Ag纳米天线的PES将为超灵敏的表面分析打开许多高级方案。