Leveraging nanoscale plasmonic modes to achieve reproducible enhancement of light.
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 1.6 nm, all NPs exhibit a strong Raman signal that decays rapidly as the spacer layer is increased.
Hill
Ryan T
RT
Center for Biologically Inspired Materials and Material Systems, Duke University, Box 90271, Durham, North Carolina 27708, USA.
Mock
Jack J
JJ
Urzhumov
Yaroslav
Y
Sebba
David S
DS
Oldenburg
Steven J
SJ
Chen
Shiuan-Yeh
SY
Lazarides
Anne A
AA
Chilkoti
Ashutosh
A
Smith
David R
DR
D006046:Gold / Q000737:chemistry*; D008027:Light; D053758:Nanoparticles / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D013059:Spectrum Analysis, Raman; D055672:Static Electricity
D006046:Gold
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