Environmental Sciences.
Nano Lett. 2010 Dec 8;10(12):4952-5. doi: 10.1021/nl102963g. Epub 2010 Nov 19.
We describe plasmonic interactions in suspended gold bowtie nanoantenna leading to strong electromagnetic field (E) enhancements. Surface-enhanced Raman scattering (SERS) was used to demonstrate the performance of the nanoantenna. In addition to the well-known gap size dependence, up to 2 orders of magnitude additional enhancement is observed with elevated bowties. The overall behavior is described by a SERS enhancement factor exceeding 10(11) along with an anomalously weak power law dependence of E on the gap size in a range from 8 to 50 nm that is attributed to a plasmonic nanocavity effect occurring when the plasmonic interactions enter a strongly coupled regime.
我们描述了悬空金蝶形纳米天线中的等离子体相互作用，导致了强电磁场（E）的增强。表面增强拉曼散射（SERS）被用来证明纳米天线的性能。除了众所周知的间隙尺寸依赖性外，还观察到升高的蝶形纳米天线的额外增强高达 2 个数量级。整体行为由 SERS 增强因子描述，超过 10（11），并且在 8 至 50nm 的范围内，E 对间隙尺寸的幂律依赖性异常弱，这归因于当等离子体相互作用进入强耦合状态时发生的等离子体纳米腔效应。
