Gold split-ring resonators (SRRs) as substrates for surface-enhanced raman scattering

Weisheng Yue, Yang Yang, Zhihong Wang, Longqing Chen, Xianbin Wang

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We used gold split ring resonators (SRRs) as substrates for surface-enhanced Raman scattering (SERS). The arrays of SRRs were fabricated by electron-beam lithography in combination with plasma etching. In the detection of rhodamine 6G (R6G) molecules, SERS enhancement factors of the order of 105 was achieved. This SERS enhancement increased as the size of the split gap decrease as a consequence of the matching between the resonance wavelength of the SRRs and the excitation wavelength of SERS. As the size of the split gap decreased, the localized surface plasmon resonance shifted to near the excitation wavelength and, thus, resulted in the increase in the electric field on the nanostructures. We used finite integration method (FIT) to simulate numerically the electromagnetic properties of the SRRs. The results of the simulation agreed well with our experimental observations. We anticipate this work will provide an approach to manipulate the SERS enhancement by modulating the size of split gap with SRRs without affecting the area and structural arrangement. © 2013 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)21908-21915
Number of pages8
JournalThe Journal of Physical Chemistry C
Volume117
Issue number42
DOIs
StatePublished - Oct 10 2013

ASJC Scopus subject areas

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

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