Multipolar excitation in triangular nanoprisms

Kevin L. Shuford, Mark A. Ratner, George C. Schatz

Research output: Contribution to journalArticlepeer-review

246 Scopus citations

Abstract

Theoretical studies on the optical properties of gold triangular prisms in solution are presented to determine how structural modifications affect the extinction spectrum. Well-defined trends in the particle extinction are found to depend on the triangular edge length and the prism thickness. Calculations performed on large, thin triangular prisms indicate multipolar excitation and display numerous peaks in the extinction spectrum. The dominant peaks are assigned to different in-plane modes corresponding to the lowest three orders of a multipole expansion. Vector polarization plots are presented to support the peak assignments. Altering the prisms by snipping off the points of the triangular cross section significantly blueshifts the dipole peak, but the higher-order modes are only slightly affected. Snipping off large volumes can lead to the suppression of high-order multipoles in the extinction spectrum.

Original languageEnglish (US)
Article number114713
JournalJournal of Chemical Physics
Volume123
Issue number11
DOIs
StatePublished - Sep 15 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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