Magnetic dipolar interactions in solid gold nanosphere dimers

Manabendra Chandra, Anne Marie Dowgiallo, Kenneth L. Knappenberger

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25 Scopus citations

Abstract

We report the first observation of a magnetic dipolar contribution to the nonlinear optical (NLO) response of colloidal metal nanostructures. Second-order NLO responses from several individual solid gold nanosphere (SGN) dimers, which we prepared by a bottom-up approach, were examined using polarization-resolved second harmonic generation (SHG) spectroscopy at the single-particle level. Unambiguous circular dichroism in the SH signal was observed for most of the dimeric colloids, indicating that the plasmon field located within the interparticle gap was chiral. Detailed analysis of the polarization line shapes of the SH intensities obtained by continuous polarization variation suggested that the effect resulted from strong magnetic-dipole contributions to the nanostructure's optical properties.

Original languageEnglish (US)
Pages (from-to)4477-4480
Number of pages4
JournalJournal of the American Chemical Society
Volume134
Issue number10
DOIs
StatePublished - Mar 14 2012

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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