Surface-enhanced hyper-Raman spectra and enhancement factors for three SERS chromophores. SEHRS spectra on Ag films at pulse energies below 2 pJ

J Am Chem Soc. 2006 Mar 22;128(11):3492-3. doi: 10.1021/ja057946z.

Abstract

Hyper-Raman scattering, the nonlinear (two-photon excited) analogue of ordinary Raman scattering, is usually considered to be a weak process that requires high-energy pulsed laser excitation. The sensitivity can be improved greatly by making use of two-photon electronic resonance and/or electromagnetic field enhancement on metal nanoparticle surfaces. Here we demonstrate that hyper-Raman spectra can be obtained from organic dyes on silver colloidal nanoparticle films at laser powers below 1 mW of average power (pulse energies below 2 pJ). These results open the door to exploiting the potential advantages of hyper-Raman scattering for analytical applications.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Carbocyanines / chemistry*
  • Colloids
  • Fluorescent Dyes / chemistry
  • Gentian Violet / chemistry*
  • Rhodamines / chemistry*
  • Silver / chemistry
  • Spectrum Analysis, Raman / methods*

Substances

  • Carbocyanines
  • Colloids
  • Fluorescent Dyes
  • Rhodamines
  • rhodamine 6G
  • Silver
  • Gentian Violet