Metallic Membranes with Subwavelength Complementary Patterns: Distinct Substrates for Surface-Enhanced Raman Scattering

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• 作者：Qingzhen Hao ; Yong Zeng ; Bala Krishna Juluri ; Xiande Wang ; Brian Kiraly ; I-Kao Chiang ; Lasse Jensen ; Douglas H. Werner ; Vincent H. Crespi ; Tony Jun Huang
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：July 26, 2011
• 年：2011
• 卷：5
• 期：7
• 页码：5472-5477
• 全文大小：869K
• 年卷期：0
• ISSN：1936-086X

文摘

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 cos⁴ 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.