Light emitted by fluorophores can be computed from the knowledge of the absorption spectrum. However, at long wavelengths, the calculated emission may diverge if the decay of the imaginary part of the permittivity is not modelled accurately. We report a technique to obtain the permittivity of fluorophores such as dye molecules from fluorescence measurements. We find that the Brendel-Bormann model enables to fit the emission spectra accurately.
In the weak coupling regime of light-matter interaction, the spontaneous emission of a fluorescent emitter can be tuned by placing it in a nanostructured environment such as plasmonic structures. In the strong coupling regime, the hybridization of the emitters with surface plasmons generates spatially extended coherent states called polaritons. These states span over a coherence length of several microns. We show how fluorescent quantum dots weakly coupled to a surface plasmon interact with J-aggregated organic molecules strongly coupled with a surface plasmon. We study how such interaction changes by tuning the wavelength of the quantum dots along the polariton bands.
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