Fluorescence enhancement in hot spots of AFM-designed gold nanoparticle sandwiches
Fluorescence enhancement in hot spots of AFM-designed gold nanoparticle sandwiches
复制标题
DOI：
10.1021/nl072602n
复制
发表时间：
2008-02-01
期刊：
影响因子：
10.8
通讯作者：
Feldmann, Jochen
中科院分区：
文献类型：
--
作者：
Bek, Alpan;Jansen, Reiner;Feldmann, Jochen
我们观察到单个荧光球的荧光增强，它被夹在两个单独的金纳米粒子之间，形成了一个强场增强的热点。荧光增强热点是通过精心设计的金纳米颗粒与原子力显微镜悬臂组装而成的。在监测荧光强度的同时，通过逐渐将金纳米颗粒推向荧光球体，减少了两个金纳米颗粒之间的分离。当两个金纳米粒子之间的距离最小时，当激发极化平行于夹层的轴线时，以及当荧光球正好位于连接两个金纳米粒子的轴上时，荧光增强作用最大。
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.