Polarization and distance dependent coupling in linear chains of gold nanoparticles
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 squar...
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Veröffentlicht in: | Applied physics letters 2015-02, Vol.106 (5) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.4907322 |