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Polarization and distance dependent coupling in linear chains of gold nanoparticles
Ist Teil von
Applied physics letters, 2015-02, Vol.106 (5)
Ort / Verlag
Melville: American Institute of Physics
Erscheinungsjahr
2015
Quelle
American Institute of Physics (AIP) Journals
Beschreibungen/Notizen
We studied collective surface plasmon excitations in chains of gold nanoparticles. The resonance frequency of these excitations is a function of the distance between the particles and polarization of the incident light. The near-field coupling between the particles in a chain leads to a cosine squared angular dependence between the polarization of the incident light and the axis connecting the particles. The far-field coupling between the particles results in a sine squared angular dependence. When the incident light is polarized along the chain, the near-field coupling exhibits a red shift, while the far-field exhibits a blue shift of the collective plasmon mode with respect to the mode of the non-interacting particles. We experimentally determined the particle separation for which the resonance frequency in the extinction spectra is polarization-independent.