Tailorable plasmonic circular dichroism properties of helical nanoparticle superstructures

Chengyi Song, Martin G. Blaber, Gongpu Zhao, Peijun Zhang, H. Christopher Fry, George C. Schatz, Nathaniel L. Rosi*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

151 Scopus citations

Abstract

We utilize a peptide-based methodology to prepare a diverse collection of double-helical gold nanoparticle superstructures having controllable handedness and structural metrics. These materials exhibit well-defined circular dichroism signatures at visible wavelengths owing to the collective dipole-dipole interactions between the nanoparticles. We couple theory and experiment to show how tuning the metrics and structure of the helices results in predictable and tailorable chirooptical properties. Finally, we experimentally and theoretically demonstrate that the intensity, position, and nature of the chirooptical activity can be carefully adjusted via silver overgrowth. These studies illustrate the utility of peptide-based nanoparticle assembly platforms for designing and preparing complex plasmonic materials with tailorable optical properties.

Original languageEnglish (US)
Pages (from-to)3256-3261
Number of pages6
JournalNano letters
Volume13
Issue number7
DOIs
StatePublished - Jul 10 2013

Keywords

  • Chiral nanostructures
  • chirality
  • circular dichroism
  • nanoparticle assembly
  • surface plasmon

ASJC Scopus subject areas

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

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