Journal
NANO LETTERS
Volume 10, Issue 10, Pages 4150-4154Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl102443p
Keywords
Nanophotonics; plasmon resonant nanoparticles; surface-enhanced resonant Raman scattering; gold film; doughnut
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Funding
- NIH [R21EB009862]
- NIH NIBIB [F32EB009299]
- Air Force Office of Scientific Research [FA9550-09-1-0562]
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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 With a spacer layer of roughly 16 nm, all NPs exhibit a strong Raman signal that decays rapidly as the spacer layer is increased
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