Article

Applied Physics B

, Volume 113, Issue 4, pp 519-525

First online:

A Kirchhoff solution to plasmon hybridization

  • Britain WillinghamAffiliated withDepartment of Chemistry, Laboratory for Nanophotonics, Rice University
  • , Stephan LinkAffiliated withDepartment of Chemistry, Laboratory for Nanophotonics, Rice UniversityDepartment of Electrical and Computer Engineering, Laboratory for Nanophotonics, Rice University Email author 

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Abstract

Using Ohm’s law, a solution to plasmon hybridization via Kirchoff’s equations results in a simple and intuitive picture of a metal nanoparticle dimer as a capacitively coupled circuit. Calculated absorption spectra and surface charge densities show that dimers of different metallic composition support different super- and sub-radiant plasmons compared to homodimers. Strong screening of Coulomb interactions between nanoparticles of different metallic background prohibits the excitation of anti-bonding plasmons, while changes to the free electron conductivity upon a collective response result in coupled plasmon lifetimes which shift as a function of interparticle distance. Smaller separations then result in the longest lived plasmons.