Nonlocal dielectric effects in core-shell nanowires

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

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We study the optical spectra and near fields of core-shell nanowires (nanoshells), using a recently developed finite-difference method that allows for a spatially nonlocal dielectric response. We first analyze the parameters of the nonlocal model by making comparisons with related experimental data and previous theoretical work. We then investigate how nonlocal effects are dependent on nanoshell features, such as shell thickness, overall size, and the ratio of core radius to shell radius. We demonstrate that the shell thickness along the longitudinal direction of the incident light is the primary controlling factor of nonlocal effects, which appear as anomalous absorption resonances and blueshifts in the localized surface plasmon resonance (LSPR) positions, relative to local theory. In addition, we show that the amount of blueshift depends on the order of the LSPR. The optical responses of nanoshells immersed in various refractive index (RI) environments are also studied. We show that the nonlocal anomalous absorption features are relatively insensitive to RI changes, but the blueshift of the dipolar LSPR varies nonlinearly.

Original languageEnglish
Pages (from-to)15903-15908
Number of pages6
JournalJournal of Physical Chemistry C
Volume114
Issue number38
DOIs
Publication statusPublished - Sep 30 2010

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Nanoshells
Surface plasmon resonance
surface plasmon resonance
Nanowires
nanowires
Refractive index
refractivity
radii
Finite difference method
optical spectrum
near fields

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Nonlocal dielectric effects in core-shell nanowires. / McMahon, Jeffrey M.; Gray, Stephen K.; Schatz, George C.

In: Journal of Physical Chemistry C, Vol. 114, No. 38, 30.09.2010, p. 15903-15908.

Research output: Contribution to journalArticle

McMahon, Jeffrey M. ; Gray, Stephen K. ; Schatz, George C. / Nonlocal dielectric effects in core-shell nanowires. In: Journal of Physical Chemistry C. 2010 ; Vol. 114, No. 38. pp. 15903-15908.
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