Details

Autor(en) / Beteiligte

• Kravets, Vira V.
• Ocola, Leonidas E.
• Khalavka, Yuriy
• Pinchuk, Anatoliy O.

Titel

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.