金属纳米尖对荧光和拉曼散射的等离子体增强
Plasmonic enhancement of fluorescence and Raman scattering by metal nanotips
摘要：
我们报告的贵金属纳米尖附近的荧光团的光学性质的修改。利用无孔径扫描近场光学显微镜对小团簇量子点的荧光进行了成像。当一个尖锐的金尖端被带到接近样品表面，一个强大的距离依赖性增强的量子点荧光观察，导致光学分辨率的同时增加。这些结果与等离子体纳米结构附近的电场和荧光增强的模拟一致。银纳米尖的高度有序的周期性阵列已被制造的纳米球光刻。使用荧光寿命成像显微镜，我们已经创建了高分辨率的空间地图的邻近的荧光团的寿命组件，这些显示了一个数量级的增加衰减率从一个本地化的体积周围的纳米尖，导致在荧光发射强度的相应增强。来自纳米尖端上分子的拉曼散射信号的空间图显示了超过5个数量级的增强。
英文摘要：
We report modifications to the optical properties of fluorophores in the vicinity of noble metal nanotips. The fluorescence from small clusters of quantum dots has been imaged using an apertureless scanning near-field optical microscope. When a sharp gold tip is brought close to the sample surface, a strong distance-dependent enhancement of the quantum dot fluorescence is observed, leading to a simultaneous increase in optical resolution. These results are consistent with simulations of the electric field and fluorescence enhancement near plasmonic nanostructures. Highly ordered periodic arrays of silver nanotips have been fabricated by nanosphere lithography. Using fluorescence lifetime imaging microscopy, we have created high resolution spatial maps of the lifetime components of vicinal fluorophores; these show an order of magnitude increase in decay rate from a localized volume around the nanotips, resulting in a commensurate enhancement in the fluorescence emission intensity. Spatial maps of the Raman scattering signal from molecules on the nanotips shows an enhancement of more than 5 orders of magnitude.
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