Polarization and distance dependent coupling in linear chains of gold nanoparticles
- Univ. of Colorado, Colorado Springs, CO (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Chernivtsi National Univ. (Ukraine)
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. Here, we experimentally determined the particle separation for which the resonance frequency in the extinction spectra is polarization-independent.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357; UKC2-7071-CH-12; SFPP-984617
- OSTI ID:
- 1237934
- Alternate ID(s):
- OSTI ID: 1226703
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 5; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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