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Title: Double strong exciton-plasmon coupling in gold nanoshells infiltrated with fluorophores

We report on the broadband resonant energy transfer processes observed in dye doped gold nanoshells, consisting of spherical particles with a dielectric core (SiO{sub 2}) covered by a thin gold shell. The silica core has been doped with rhodamine B molecules in order to harness a coherent plasmon-exciton coupling between chromophores and plasmonic shell. This plasmon-exciton interplay depends on the relative spectral position of their bands. Here, we present a simultaneous double strong coupling plasmon-exciton and exciton-plasmon. Indeed, experimental observations reveal of a transmittance enhancement as function of the gain in a wide range of optical wavelengths (about 100 nm), while scattering cross sections remains almost unmodified. These results are accompanied by an overall reduction of chromophore fluorescence lifetimes that are a clear evidence of nonradiative energy transfer processes. The increasing of transmission in the range of 630–750 nm is associated with a striking enhancement of the extinction cross-section in the 510–630 nm spectral region. In this range, the system assumes super-absorbing features. This double behavior, as well as the broadband response of the presented system, represents a promising step to enable a wide range of electromagnetic properties and fascinating applications of plasmonic nanoshells as building blocks for advanced optical materials.
Authors:
; ;  [1] ; ; ;  [2] ;  [3] ;  [4] ;  [3]
  1. CNR-IPCF UOS Cosenza, Licryl Laboratory, Department of Physics, University of Calabria, Via P. Bucci, 87036 Rende (Italy)
  2. CRPP, Centre de Recherche Paul Pascal, CNRS and University of Bordeaux, 115 Avenue Schweitzer, 33600 Pessac (France)
  3. Department of Physics, Case Western Reserve University, 10600 Euclid Avenue, Cleveland, Ohio 44106-7079 (United States)
  4. (Italy)
Publication Date:
OSTI Identifier:
22257056
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DIELECTRIC MATERIALS; DOPED MATERIALS; ENERGY TRANSFER; EXCITONS; FLUORESCENCE; GOLD; NANOSTRUCTURES; PLASMONS; STRONG-COUPLING MODEL