Drude relaxation rate in grained gold nanoantennas

Kuo Ping Chen, Vladimir P. Drachev, Joshua D. Borneman, Alexander V. Kildishev, Vladimir M. Shalaev

Research output: Contribution to journalArticlepeer-review

157 Citations (Scopus)

Abstract

The effect of grain boundaries on the electron relaxation rate is significant even for large area noble metal films and more so for plasmonic nanostructures. Optical spectroscopy and X-ray diffraction show a substantial improvement in plasmon resonance quality for square particle nanoantennas after annealing due to an enlarged grain size from 22 to 40 nm and improved grain boundaries described by the electron reflection coefficient. The electron relaxation rate due to the grains is shown to decrease by a factor of 3.2.

Original languageEnglish
Pages (from-to)916-922
Number of pages7
JournalNano Letters
Volume10
Issue number3
DOIs
Publication statusPublished - 10 Mar 2010
Externally publishedYes

Keywords

  • Annealing
  • Electron relaxation rate
  • Grain structure
  • Nanoantennas
  • Plasmonics

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