Multipolar excitation in triangular nanoprisms

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

Research output: Contribution to journalArticle

239 Citations (Scopus)

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
Article number114713
JournalJournal of Chemical Physics
Volume123
Issue number11
DOIs
Publication statusPublished - Sep 15 2005

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Prisms
prisms
extinction
multipoles
excitation
Gold
Optical properties
plots
retarding
Polarization
gold
dipoles
trends
optical properties
expansion
cross sections
polarization

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Multipolar excitation in triangular nanoprisms. / Shuford, Kevin L.; Ratner, Mark A; Schatz, George C.

In: Journal of Chemical Physics, Vol. 123, No. 11, 114713, 15.09.2005.

Research output: Contribution to journalArticle

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