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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


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 (US)
Pages (from-to)6949-6954
Number of pages6
JournalNano letters
Issue number12
StatePublished - Dec 10 2014


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

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Bioengineering
  • General Chemistry
  • General Materials Science


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