Polarization-dependent multipolar plasmon resonances in anisotropic multiscale au particles

Eun Ah You, Wei Zhou, Jae Yong Suh, Mark D. Huntington, Teri W. Odom

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

This paper reports the fabrication and characterization of three-dimensional (3D) multiscale Au particles with different aspect ratios. Increasing the length of the particles resulted in excitation of a longitudinal mode and two different transverse modes having different multipolar orders. The multipolar orders increased for both longitudinal and transverse modes as the aspect ratio increased. Finite-difference time-domain calculations revealed that the structural asymmetry of the 3D anisotropic particles were the reason for the two distinct transverse plasmon resonances. When the 3D structural change occurred at the ends of the multiscale particle, however, the optical response showed two resonances in the longitudinal direction and only a single resonance in the transverse direction.

Original languageEnglish
Pages (from-to)1786-1794
Number of pages9
JournalACS nano
Volume6
Issue number2
DOIs
Publication statusPublished - Feb 28 2012

Keywords

  • 3D anisotropic nanoparticles
  • multipolar longitudinal plasmon modes
  • multipolar transverse plasmon modes
  • multiscale particles
  • polarization-dependent scattering

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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