Optical Field Enhancement in Au Nanoparticle-Decorated Nanorod Arrays Prepared by Femtosecond Laser and Their Tunable Surface-Enhanced Raman Scattering Applications

Wei Cao, Lan Jiang, Jie Hu, Andong Wang, Xiaowei Li, Yongfeng Lu

Research output: Contribution to journalArticle

13 Scopus citations


Various Au nanostructures have been demonstrated to have an enhanced local electric field around them because of surface plasmons. Herein, we propose a novel method for fabricating Au nanoparticle-decorated nanorod (NPDN) arrays through femtosecond laser irradiation combined with Au coating and annealing. The nanorod cavities strongly confined light and produced an enhanced optical field in response to Au nanoparticles (NPs) introduction. The nanogap and diameter of the fabricated Au NPs significantly affected the surface-enhanced Raman scattering (SERS) performance and could be simultaneously tuned with thickness-controllable Au films and substrate morphologies. The resulting Au NPDN substrate was observed to have efficient "hot spots" for tunable SERS applications. We experimentally determined that the enhancement factor of the Au NPDN substrate reached up to 8.3 × 107 at optimal parameters. Moreover, the Au NPDN substrate showed superior chemical stability, with the greatest intensity deviation of 3.2% on exposure to air for 2 months. This work provides a promising method to fabricate tunable plasmonic surfaces for highly sensitive, reproducible, and chemically stable SERS applications.

Original languageEnglish (US)
Pages (from-to)1297-1305
Number of pages9
JournalACS Applied Materials and Interfaces
Issue number1
Publication statusPublished - Jan 10 2018



  • Au nanoparticle
  • femtosecond laser
  • optical field enhancement
  • plasmonic nanorod
  • surface-enhanced Raman scattering (SERS)

ASJC Scopus subject areas

  • Materials Science(all)

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