Systematic study of antibonding modes in gold nanorod dimers and trimers

Kyle D. Osberg, Nadine Harris, Tuncay Ozel, Jessie C. Ku, George C. Schatz, Chad A. Mirkin

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Using on-wire lithography to synthesize well-defined nanorod dimers and trimers, we report a systematic study of the plasmon coupling properties of such materials. By comparing the dimer/trimer structures to discrete nanorods of the same overall length, we demonstrate many similarities between antibonding coupled modes in the dimers/trimers and higher-order resonances in the discrete nanorods. These conclusions are validated with a combination of discrete dipole approximation and finite-difference time-domain calculations and lead to the observation of antibonding modes in symmetric structures by measuring their solution-dispersed extinction spectra. Finally, we probe the effects of asymmetry and gap size on the occurrence of these modes and demonstrate that the delocalized nature of the antibonding modes lead to longer-range coupling compared to the stronger bonding modes.

Original languageEnglish
Pages (from-to)6949-6954
Number of pages6
JournalNano letters
Volume14
Issue number12
DOIs
Publication statusPublished - Dec 10 2014

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Keywords

  • On-wire lithography
  • nanoparticle arrays
  • nanorods
  • plasmon coupling
  • plasmonics

ASJC Scopus subject areas

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

Cite this

Osberg, K. D., Harris, N., Ozel, T., Ku, J. C., Schatz, G. C., & Mirkin, C. A. (2014). Systematic study of antibonding modes in gold nanorod dimers and trimers. Nano letters, 14(12), 6949-6954. https://doi.org/10.1021/nl503207j