Study of Signal-to-Background Ratio of Surface-Enhanced Raman Scattering: Dependences on Excitation Wavelength and Hot-Spot Gap

Mykhaylo M. Dvoynenko, Huai Hsien Wang, Hui Hsin Hsiao, Yuh Lin Wang, Juen Kai Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Signal-to-background ratio of surface-enhanced Raman scattering (SERS) plays an important role in the analytic applications of SERS. Its dependences on excitation wavelength and gap between metal particles were studied theoretically and experimentally. We show that this ratio is higher at smaller gaps for the same excitation wavelength and is higher for the wavelengths having higher values of the absolute values of the dielectric function of the metal. This study thus results in design guidelines in the fabrication of SERS-active substrates with high signal-to-background ratio.

Original languageEnglish
Pages (from-to)26438-26445
Number of pages8
JournalJournal of Physical Chemistry C
Volume121
Issue number47
DOIs
Publication statusPublished - 2017 Nov 30
Externally publishedYes

ASJC Scopus subject areas

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

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