Regioselective plasmonic coupling in metamolecular analogs of benzene derivatives

Aiqin Fang, Sarah White, Prashant Jain, Francis P. Zamborini

Research output: Contribution to journalArticle

Abstract

In analogy with benzene-derived molecular structures, we construct plasmonic metamolecules by attaching Au nanospheres to specific sites on a hexagonal Au nanoplate. We employ a ligand exchange strategy that allows regioselective control of nanosphere attachment and study resulting structures using correlated electron microscopy/optical spectroscopy at the single-metamolecule level. We find that plasmonic coupling within the resulting assembly is strongly dependent on the structure of the metamolecule, in particular the site of attachment of the nanosphere(s). We also uncover a synergy in the polarizing effect of multiple nanospheres attached to the nanoplate. Regioselective control of plasmonic properties demonstrated here enables the design of novel structure-dependent electromagnetic modes and applications in three-dimensional spatial nanosensors.

Original languageEnglish (US)
Pages (from-to)542-548
Number of pages7
JournalNano Letters
Volume15
Issue number1
DOIs
StatePublished - Jan 14 2015

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Keywords

  • Localized surface plasmon resonance
  • discrete dipole approximation
  • ligand exchange
  • nanoplate
  • single-particle spectroscopy

ASJC Scopus subject areas

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

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