Plasmon length: A universal parameter to describe size effects in gold nanoparticles

Emilie Ringe, Mark R. Langille, Kwonnam Sohn, Jian Zhang, Jiaxing Huang, Chad A. Mirkin, Richard P. Van Duyne, Laurence D. Marks

Research output: Contribution to journalArticlepeer-review

139 Scopus citations


Localized surface plasmon resonances are central to many sensing and signal transmission applications. Tuning of the plasmon energy and line width through particle size and shape is critical to the design of such devices. To gain quantitative information on the size dependence of plasmonic properties, mainly due to retardation effects, we correlated optical spectra and structures for 500 individual gold particles of five different shapes. We show that the effects of size on the dipolar plasmon frequency and line width are shape-independent when size is described by the plasmon length, the length over which the oscillations take place. This result suggests that edge effects are rather unimportant for dipolar modes in a large size range between 50 and 350 nm. Therefore, in describing the size-dependent plasmonic properties of nanoparticles, one should focus on the distance along which the oscillation occurs rather than its intrinsic shape.

Original languageEnglish (US)
Pages (from-to)1479-1483
Number of pages5
JournalJournal of Physical Chemistry Letters
Issue number11
StatePublished - Jun 7 2012
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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