Quantitative evaluation of plasmon enhanced Raman scattering from nanoaperture arrays

Thomas H. Reilly, Shih Hui Chang, Jordan D. Corbman, George C. Schatz, Kathy L. Rowlen

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

Nanoaperture arrays in a silver film were quantitatively evaluated, for the first time, to determine the absolute Raman scattering enhancement factors as a function of aperture lattice spacing using a nonresonant analyte. The arrays, with 200 nm diameter apertures and varying spacing in a 50 nm thick silver film, resulted in an average area-corrected SERS enhancement factor of (6 ± 3) × 107 for 514.5 nm excitation. Comparison between theory and experiment provided critical insight into the magnitude and origin of enhancement in these nanoaperture arrays as a function of lattice spacing. The measured enhancement factor was attributed to two distinct sources: a factor of 105 from nm scale roughness associated with the Ag film in the absence of the nanoapertures and a factor of 6 × 102 associated with plasmons localized near the aperture edges.

Original languageEnglish
Pages (from-to)1689-1694
Number of pages6
JournalJournal of Physical Chemistry C
Volume111
Issue number4
DOIs
Publication statusPublished - Feb 1 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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