Reconfigurable core-satellite nanoassemblies as molecularly-driven plasmonic switches.
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.
Department of Mechanical Engineering and Materials Science, Duke University, Durham, North Carolina 27708, USA.
David S
DS
Sebba
Jack J
JJ
Mock
David R
DR
Smith
Thomas H
TH
Labean
Anne A
AA
Lazarides
D001483:Base Sequence; D003198:Computer Simulation; D004247:DNA / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D008956:Models, Chemical; D008969:Molecular Sequence Data; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D013057:Spectrum Analysis; D020349:Surface Plasmon Resonance
D004247:DNA