Optical properties of nanowire dimers with a spatially nonlocal dielectric function

Jeffrey M. McMahon, Stephen K. Gray, George C Schatz

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

We study the optical spectra and electromagnetic field enhancements around cylindrical and triangular Ag nanowire dimers, allowing for a spatially nonlocal dielectric function that partially accounts for quantum mechanical effects. For the triangular structures, we pay particular attention to how these properties depend on the sharpness of the nanowire's tips. We demonstrate that significant differences exist from classical electrodynamics that employs a more common, spatially local dielectric function. These differences are shown to arise from the optical excitation of volume plasmons inside of the structures, analogous to one-particle quantum mechanical states, which lead to complex and striking patterns of material polarization. These results are important for further understanding the optical properties of structures at the nanoscale and have implications for numerous physical processes, such as surface-enhanced Raman scattering.

Original languageEnglish
Pages (from-to)3473-3481
Number of pages9
JournalNano Letters
Volume10
Issue number9
DOIs
Publication statusPublished - Sep 8 2010

Fingerprint

Dimers
Nanowires
nanowires
Optical properties
dimers
optical properties
Plasmons
Photoexcitation
Electrodynamics
sharpness
plasmons
electrodynamics
Electromagnetic fields
optical spectrum
Raman scattering
electromagnetic fields
Polarization
Raman spectra
augmentation
polarization

Keywords

  • FDTD
  • field enhancement
  • nanowire
  • nonlocal dielectric

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Optical properties of nanowire dimers with a spatially nonlocal dielectric function. / McMahon, Jeffrey M.; Gray, Stephen K.; Schatz, George C.

In: Nano Letters, Vol. 10, No. 9, 08.09.2010, p. 3473-3481.

Research output: Contribution to journalArticle

McMahon, Jeffrey M. ; Gray, Stephen K. ; Schatz, George C. / Optical properties of nanowire dimers with a spatially nonlocal dielectric function. In: Nano Letters. 2010 ; Vol. 10, No. 9. pp. 3473-3481.
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