Plasmonics

, Volume 7, Issue 1, pp 143–150 | Cite as

The Role of Propagating and Localized Surface Plasmons for SERS Enhancement in Periodic Nanostructures

  • Francisco J. Bezares
  • Joshua D. Caldwell
  • Orest Glembocki
  • Ronald W. Rendell
  • Mariya Feygelson
  • Maraizu Ukaegbu
  • Richard Kasica
  • Loretta Shirey
  • Nabil D. Bassim
  • Charles Hosten
Article

Abstract

Periodic arrays of plasmonic nanopillars have been shown to provide large, uniform surface-enhanced Raman scattering (SERS) enhancements. We show that these enhancements are the result of the combined impact of localized and propagating surface plasmon modes within the plasmonic architecture. Here, arrays of periodically arranged silicon nanopillars of varying sizes and interpillar gaps were fabricated to enable the exploration of the SERS response from two different structures; one featuring only localized surface plasmon (LSP) modes and the other featuring LSP and propagating (PSP) modes. It is shown that the LSP modes determine the optimal architecture, and thereby determine the optimum diameter for the structures at a given incident. However, the increase in the SERS enhancement factor for a system in which LSP and PSP cooperatively interact was measured to be over an order of magnitude higher and the peak in the diameter dependence was significantly broadened, thus, such structures not only provide larger enhancement factors but are also more forgiving of lithographic variations.

Keywords

SERS Surface plasmons E-beam lithography Molecular detection Plasmonics 

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Copyright information

© Springer Science+Business Media, LLC (outside the USA) 2011

Authors and Affiliations

  • Francisco J. Bezares
    • 1
  • Joshua D. Caldwell
    • 1
  • Orest Glembocki
    • 1
  • Ronald W. Rendell
    • 1
  • Mariya Feygelson
    • 1
  • Maraizu Ukaegbu
    • 2
  • Richard Kasica
    • 3
  • Loretta Shirey
    • 1
  • Nabil D. Bassim
    • 1
  • Charles Hosten
    • 2
  1. 1.US Naval Research LaboratoryWashingtonUSA
  2. 2.Chemistry DepartmentHoward UniversityWashingtonUSA
  3. 3.Center for Nanoscale Science and TechnologyNational Institute for Standards and TechnologyGaithersburgUSA

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