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Layer-by-layer self-assembly of plexcitonic nanoparticles.

Brendan G DeLacy1, Wenjun Qiu, Marin Soljačić

  • 1U.S. Army Edgewood Chemical Biological Center, Research & Technology Directorate 5183 Blackhawk Rd., Aberdeen Proving Ground, MD 21010-5424, USA. brendan.g.delacy.civ@mail.mil

Optics Express
|August 14, 2013
PubMed
Summary
This summary is machine-generated.

Researchers created novel multilayer nanoparticles with silver cores and J-aggregate dye shells. The spacer layer controls plasmon-exciton coupling, influencing dye absorption wavelength based on distance and aggregation.

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Area of Science:

  • * Nanotechnology and Materials Science
  • * Plasmonics and Photonics
  • * Supramolecular Chemistry

Background:

  • * Development of hybrid nanostructures for tunable optical properties.
  • * Investigating the coupling between localized surface plasmon resonance (LSPR) and molecular excitons.
  • * Role of interfacial layers in controlling nanostructure behavior.

Purpose of the Study:

  • * To synthesize and characterize novel multilayer nanoparticles with silver cores and J-aggregate cyanine dye shells.
  • * To examine the coupling between LSPR of the silver core and the molecular exciton of the J-aggregate.
  • * To investigate the influence of a polyelectrolyte spacer layer on plasmon-exciton (plexciton) coupling and dye aggregation.

Main Methods:

  • * Preparation of colloidal suspensions of multilayer nanoparticles (silver core/polyelectrolyte spacer/J-aggregate dye shell).
  • * Optical absorption spectroscopy in the visible region.
  • * Application of Mie Theory and Transfer Matrix Method for theoretical analysis.

Main Results:

  • * Successful synthesis of novel multilayer nanoparticles.
  • * Demonstration of plasmon-exciton coupling (plexciton formation).
  • * Observed dependence of J-aggregate absorption wavelength on dye layer distance from the silver core and dye aggregation degree.

Conclusions:

  • * The polyelectrolyte spacer layer effectively promotes J-aggregate formation and controls plexciton coupling strength.
  • * The optical response of the nanostructures can be tuned by adjusting the spacer layer thickness.
  • * Absorption wavelength is sensitive to both nanostructure geometry and dye aggregation state.