Slab Thickness Dependence of Localized Surface Plasmon Resonance Behavior in Gold Nanorings

Chia Yang Tsai, Che Yao Wu, Kai Hau Chang, Po-Tsung Lee*

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

We present detailed experimental and numerical studies of plasmonic properties of gold nanoring (NR) arrays with different slab thicknesses from 15 to 125 nm. The hybrid plasmon resonances for the bonding and antibonding modes in gold NRs exhibit a high slab thickness dependence behavior in optical properties. For the thinner slab thickness below 50 nm, both hybrid modes show large spectral tunabilities by varying the slab thickness. Furthermore, for such hollow NR structure, the enhancements of electric field intensities at the inner and outer ring surfaces when reducing the slab thickness are investigated. We observe a significant transition of field distributions for the antibonding mode. All these features can be understood by surface charge distributions from our simulations. The results of this study offer a potential strategy to design a composite plasmonic nanostructure with large field enhancement for numerous applications.

Original languageEnglish
Pages (from-to)1011-1016
Number of pages6
JournalPlasmonics
Volume8
Issue number2
DOIs
StatePublished - 1 Jun 2013

Keywords

  • Nanoring
  • Plasmonic array
  • Surface plasmon

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