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[46] Transition from Isolated to Collective Modes in Plasmonic Oligomers
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01

Jul

2010

Transition from Isolated to Collective Modes in Plasmonic Oligomers.

Nano Lett. 2010, 10 (7), pp 2721–2726
Link to paper

Mario Hentschel†‡, Michael Saliba†‡, Ralf Vogelgesang‡, Harald Giessen†, A. Paul Alivisatos§ and Na Liu*§
† 4. Physikalisches Institut and Research Center Scope, Universität Stuttgart, D-70569 Stuttgart, Germany
‡ Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, 70569 Stuttgart, Germany
§ Department of Chemistry, University of California, Berkeley, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
Nano Lett., 2010, 10 (7), pp 2721–2726
DOI: 10.1021/nl101938p
Publication Date (Web): June 29, 2010
We demonstrate the transition from isolated to collective optical modes in plasmonic oligomers. Specifically, we investigate the resonant behavior of planar plasmonic hexamers and heptamers with gradually decreasing the interparticle gap separation. A pronounced Fano resonance is observed in the plasmonic heptamer for separations smaller than 60 nm. The spectral characteristics change drastically upon removal of the central nanoparticle. Our work paves the road toward complex hierarchical plasmonic oligmers with tailored optical properties.
  		 

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