Quantitative Evaluation of Plasmon Enhanced Raman Scattering from Nanoaperture Arrays

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• 作者：Thomas H. Reilly ; III ; Shih-Hui Chang ; Jordan D. Corbman ; George C. Schatz ; Kathy L. Rowlen
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：February 1, 2007
• 年：2007
• 卷：111
• 期：4
• 页码：1689 - 1694
• 全文大小：224K
• 年卷期：v.111,no.4(February 1, 2007)
• ISSN：1932-7455

文摘

Nanoaperture arrays in a silver film were quantitatively evaluated, for the first time, to determine the absoluteRaman 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 anaverage area-corrected SERS enhancement factor of (6 ± 3) × 10⁷ for 514.5 nm excitation. Comparisonbetween theory and experiment provided critical insight into the magnitude and origin of enhancement inthese nanoaperture arrays as a function of lattice spacing. The measured enhancement factor was attributedto two distinct sources: a factor of 10⁵ from nm scale roughness associated with the Ag film in the absenceof the nanoapertures and a factor of 6 × 10² associated with plasmons localized near the aperture edges.