Leveraging nanoscale plasmonic modes to achieve reproducible enhancement of light.
Leveraging nanoscale plasmonic modes to achieve reproducible enhancement of light.
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DOI:
10.1021/nl102443p
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发表时间:
2010-10-13
期刊:
影响因子:
10.8
通讯作者:
Smith DR
中科院分区:
文献类型:
--
作者:
Hill RT;Mock JJ;Urzhumov Y;Sebba DS;Oldenburg SJ;Chen SY;Lazarides AA;Chilkoti A;Smith DR
The strongly enhanced and localized optical fields that occur within the gaps between metallic nanostructures can be leveraged for a wide range of functionality in nanophotonic and optical metamaterial applications. Here, we introduce a means of precise control over these nanoscale gaps through the application of a molecular spacer layer that is self-assembled onto a gold film, upon which gold nanoparticles (NPs) are deposited electrostatically. Simulations using a three-dimensional finite element model and measurements from single NPs confirm that the gaps formed by this process, between the NP and the gold film, are highly reproducible transducers of surface-enhanced resonant Raman scattering (SERRS). With a spacer layer of roughly 1.6 nm, all NPs exhibit a strong Raman signal that decays rapidly as the spacer layer is increased.
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