Plasmonics

, Volume 7, Issue 1, pp 143–150

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

Authors

    • US Naval Research Laboratory
  • Joshua D. Caldwell
    • US Naval Research Laboratory
  • Orest Glembocki
    • US Naval Research Laboratory
  • Ronald W. Rendell
    • US Naval Research Laboratory
  • Mariya Feygelson
    • US Naval Research Laboratory
  • Maraizu Ukaegbu
    • Chemistry DepartmentHoward University
  • Richard Kasica
    • Center for Nanoscale Science and TechnologyNational Institute for Standards and Technology
  • Loretta Shirey
    • US Naval Research Laboratory
  • Nabil D. Bassim
    • US Naval Research Laboratory
  • Charles Hosten
    • Chemistry DepartmentHoward University
Article

DOI: 10.1007/s11468-011-9287-3

Cite this article as:
Bezares, F.J., Caldwell, J.D., Glembocki, O. et al. Plasmonics (2012) 7: 143. doi:10.1007/s11468-011-9287-3

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

SERSSurface plasmonsE-beam lithographyMolecular detectionPlasmonics

Copyright information

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