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Plasmon hybridization in nanoshell dimers.

Daniel W Brandl1, Chris Oubre, Peter Nordlander

  • 1Department of Physics and Astronomy, Rice Quantum Institute, M.S. 61, Rice University, Houston, Texas 77251-1892, USA.

The Journal of Chemical Physics
|July 30, 2005
PubMed
Summary
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We studied metallic nanoshell dimers using plasmon hybridization. Dielectric environments redshift plasmon energies and weaken interactions, impacting dimer behavior and optical absorption.

Area of Science:

  • Plasmonics and Nanophotonics
  • Computational Materials Science

Background:

  • Metallic nanoparticles exhibit unique optical properties due to surface plasmon resonances.
  • Understanding plasmon coupling in nanoparticle dimers is crucial for designing optical devices.

Purpose of the Study:

  • To investigate plasmon modes in metallic nanoshell dimers.
  • To generalize the plasmon hybridization method for dielectric environments.
  • To analyze the impact of dielectric backgrounds on dimer plasmon energies and optical absorption.

Main Methods:

  • Extended the plasmon hybridization method.
  • Generalized the formalism to include dielectric backgrounds.
  • Calculated plasmon energies and optical absorption as a function of dimer separation.

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Main Results:

  • Dielectric backgrounds shift individual nanoparticle plasmon resonances to lower energies.
  • Dielectrics screen interactions in dimer configurations, leading to a redshift in dimer energies.
  • Dimer plasmon energies showed a weaker dependence on dimer separation in dielectric environments.

Conclusions:

  • The plasmon hybridization method accurately predicts nanoshell dimer plasmonics in dielectric media.
  • Dielectric effects significantly influence the optical response of metallic nanoshell dimers.
  • Results align well with finite difference time domain (FDTD) simulations.