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.

Full Text

Duke Authors

Cited Authors

  • Hill, RT; Mock, JJ; Urzhumov, Y; Sebba, DS; Oldenburg, SJ; Chen, SY; Lazarides, AA; Chilkoti, A; Smith, DR

Published Date

  • October 13, 2010

Published In

Volume / Issue

  • 10 / 10

Start / End Page

  • 4150 - 4154

PubMed ID

  • 20804206

Electronic International Standard Serial Number (EISSN)

  • 1530-6992

Digital Object Identifier (DOI)

  • 10.1021/nl102443p

Language

  • eng