期刊
APPLIED PHYSICS LETTERS
卷 106, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4907322
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资金
- Biofrontiers Institute
- CRDF [UKC2-7071-CH-12]
- NATO [SFPP-984617]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
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. (C) 2015 AIP Publishing LLC.
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