Web Release Date: September 14,
Plasmons in the Metallic Nanoparticle-Film System as a Tunable Impurity Problem
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Laboratory for Nanophotonics, M.S. 366, Rice University, Houston, Texas 77005-1892, Department Physics and Astronomy, Trinity University, San Antonio, Texas 78212, and Department of Applied Physics, Chalmers University of Technology, S-412 96 Gothenburg, Sweden
Received August 2, 2005
Revised August 29, 2005
Abstract:
We show that the plasmon resonances of a metallic nanoparticle interacting with the surface plasmons of a metallic film is an electromagnetic analogue of the spinless Anderson-Fano model. This is the same model used to describe the interaction of a localized electronic state with a continuous band of electronic states. The three characteristic regimes of this model are realized here, where the energy of the nanoparticle plasmon resonance lies above, within, or below the energy band of surface plasmon states. These three interaction regimes are controlled by film thickness. The latter regime is experimentally observed and identified.
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