Reconfigurable core-satellite nanoassemblies as molecularly-driven plasmonic switches.


Journal Article

Molecular control of plasmon coupling is investigated in sub-100 nm assemblies composed of 13 nm gold "satellite" particles tethered by reconfigurable DNA nanostructures to a 50 nm gold "core" particle. Reconfiguration of the DNA nanostructures from a compact to an extended state results in blue shifting of the assembly plasmon resonance, indicating reduced interparticle coupling and lengthening of the core-satellite tether. Scattering spectra of the core-satellite assemblies before and after reconfiguration are compared with spectra calculated using a structural model that incorporates the core/satellite ratio determined by TEM imaging and estimates of tether length based upon prior measurements of interparticle separation in DNA linked nanoparticle networks. A strong correspondence between measured and simulated difference spectra validates the structural models that link the observed plasmon modulation with DNA nanostructure reconfiguration.

Full Text

Duke Authors

Cited Authors

  • Sebba, DS; Mock, JJ; Smith, DR; Labean, TH; Lazarides, AA

Published Date

  • July 2008

Published In

Volume / Issue

  • 8 / 7

Start / End Page

  • 1803 - 1808

PubMed ID

  • 18540653

Pubmed Central ID

  • 18540653

Electronic International Standard Serial Number (EISSN)

  • 1530-6992

International Standard Serial Number (ISSN)

  • 1530-6984

Digital Object Identifier (DOI)

  • 10.1021/nl080029h


  • eng