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ACS Nano. 2011 Jul 26;5(7):5472-7. doi: 10.1021/nn200704p. Epub 2011 Jun 14.

Metallic membranes with subwavelength complementary patterns: distinct substrates for surface-enhanced Raman scattering.

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1
Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Abstract

We present a detailed comparison of surface-enhanced Raman spectroscopy (SERS) signals from metallic nanoparticle arrays and their complementary hole arrays. Using an analytical model for local field enhancement, we show that the SERS enhancements of the hole arrays are closely related to their transmission spectra. This trend is experimentally confirmed and characterized by a cos(4 )θ dependence of the SERS signal on the excitation polarization angle θ. The particle arrays, on the other hand, exhibit quite different behavior because of the existence of considerable evanescent modes in the near field. Their maximal local field gains appear at wavelengths generally much larger than their localized surface plasmonic resonant wavelengths.

PMID:
21657215
DOI:
10.1021/nn200704p

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