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.
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Acknowledgments
The authors would like to thank Drs. Doewon Park and Robert Bass for their advice involving e-beam lithography. We also would like to express our thanks to Drs. James Long and Jeff Owrutsky for their helpful discussions. We also recognize the Center for Nanoscale Science and Technology at NIST in Gaithersburg, MD, USA, for the electron-beam lithography. The authors recognize funding support through the Naval Research Laboratory's Nanoscience Institute. F. J. Bezares acknowledges the support of the American Society of Engineering Education Postdoctoral Fellowship Program.
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Bezares, F.J., Caldwell, J.D., Glembocki, O. et al. The Role of Propagating and Localized Surface Plasmons for SERS Enhancement in Periodic Nanostructures. Plasmonics 7, 143–150 (2012). https://doi.org/10.1007/s11468-011-9287-3
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DOI: https://doi.org/10.1007/s11468-011-9287-3