A Kirchhoff solution to plasmon hybridization

作者：Willingham Britain; Link Stephan^*

来源：Applied Physics B: Lasers and Optics , 2013, 113(4): 519-525.

DOI：10.1007/s00340-013-5501-7

Using Ohm%26apos;s law, a solution to plasmon hybridization via Kirchoff%26apos;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.

• 出版日期2013-12