Effects of intrinsic Fano interference on surface enhanced Raman spectroscopy: Comparison between platinum and gold

Qingzhen Hao, Bala Krishna Juluri, Yue Bing Zheng, Bei Wang, I. Kao Chiang, Lasse Jensen, Vincent Crespi, Peter C. Eklund, Tony Jun Huang

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

Using pyridine as a probe molecule, we performed surface enhanced Raman spectroscopy (SERS) studies on platinum and gold nanodisk arrays at both plasmon resonant and off-plasmon resonant excitation wavelengths. A large Raman cross-section enhancement factor (EF) of ∼106 was obtained with plasmon resonant excitation on the Au array, and the EF decreases with off-resonant excitations. However, for Pt nanodisks the experimental EF is much smaller (∼102) and not sensitive to excitation wavelength. Electric field intensities calculated in Au and Pt nanoparticles using the discrete dipole approximation (DDA) with a dielectric function including or excluding interband transitions allowed us to explain the SERS EF differences at different excitation wavelengths. The observed SERS insensitivity to excitation wavelength in Pt was explained using Fano interference between the free plasmon electrons and continuum interband transitions. The importance of Fano interference was explored analytically in the electrostatic limit by varying the contribution from the interband transitions.

Original languageEnglish (US)
Pages (from-to)18059-18066
Number of pages8
JournalJournal of Physical Chemistry C
Volume114
Issue number42
DOIs
StatePublished - Oct 28 2010

All Science Journal Classification (ASJC) codes

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

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