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Fluorescence enhancement in hot spots of AFM-designed gold nanoparticle sandwiches

机译：AFM设计的金纳米颗粒三明治的热点处的荧光增强

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摘要

We observe an enhancement of fluorescence from a single fluorescent sphere, which is sandwiched between two individual gold nanoparticles, forming a hot spot of strong field enhancement. The fluorescence enhancing hot spot is custom-designed by the deliberate assembly of gold nanoparticles with an atomic force microscope cantilever. The fluorescence intensity is monitored while the separation between the two gold nanoparticles is reduced by gradually pushing the gold nanoparticles closer to the fluorescent sphere. The fluorescence enhancement is maximal when the distance between the two gold nanoparticles is smallest, when the excitation polarization is parallel to the axis of the sandwich, and when the fluorescent sphere is positioned exactly on the axis connecting the two gold nanoparticles.
机译：我们观察到来自单个荧光球的荧光增强，该荧光球夹在两个单独的金纳米颗粒之间，形成强场增强的热点。荧光增强热点是通过将金纳米颗粒与原子力显微镜悬臂故意组装而定制设计的。监测荧光强度，同时通过逐渐将金纳米颗粒推近荧光球来减少两个金纳米颗粒之间的分离。当两个金纳米颗粒之间的距离最小，激发极化平行于夹心轴时，以及荧光球正好位于连接两个金纳米颗粒的轴上时，荧光增强作用最大。

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