Plasmonic nanogap-enhanced raman scattering using a resonant nanodome array

Hsin Yu Wu, Charles J. Choi, Brian T. Cunningham

研究成果: 雜誌貢獻文章同行評審

118 引文 斯高帕斯(Scopus)

摘要

The optical properties and surface-enhanced Raman scattering (SERS) of plasmonic nanodome array (PNA) substrates in air and aqueous solution are investigated. PNA substrates are inexpensively and uniformly fabricated with a hot spot density of 6.25 × 106 mm-2 using a large-area nanoreplica moulding technique on a flexible plastic substrate. Both experimental measurement and numerical simulation results show that PNAs exhibit a radiative localized surface plasmon resonance (LSPR) due to dipolar coupling between neighboring nanodomes and a non-radiative surface plasmon resonance (SPR) resulting from the periodic array structure. The high spatial localization of electromagnetic field within the ∼10 nm nanogap together with the spectral alignment between the LSPR and excited and scattered light results in a reliable and reproducible spatially averaged SERS enhancement factor (EF) of 8.51 × 107 for Au-coated PNAs. The SERS enhancement is sufficient for a wide variety of biological and chemical sensing applications, including detection of common metabolites at physiologically relevant concentrations. Surface-enhanced Raman scattering (SERS) sensors are integrated in a flow cell for in-line, real-time monitoring and detection of a urinary metabolite. The effect of highly confined electromagnetic fields associated with the localized surface plasmon resonance on the analyte molecules present at EM hot spots results in enhanced excitation of Raman vibrational modes and thus in a substantial increase in the SERS intensity.

原文英語
頁(從 - 到)2878-2885
頁數8
期刊Small
8
發行號18
DOIs
出版狀態已發佈 - 九月 24 2012
對外發佈

ASJC Scopus subject areas

  • 生物材料
  • 工程(雜項)
  • 生物技術

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