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) × 10 7 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 10 5 from nm scale roughness associated with the Ag film in the absence of the nanoapertures and a factor of 6 × 10 2 associated with plasmons localized near the aperture edges.

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