Method to measure the refractive index for photoluminescence modelling

Elise Bailly (1) , Kevin Chevrier (2) , Camilo R Perez de la Vega (2) , Jean-Paul Hugonin (1) , Yannick de Wilde (2) , Valentina Krachmalnicoff (2) , Benjamin Vest (1) , Jean-Jacques Greffet (1)

1 Laboratoire Charles Fabry / Nanophotonique
2 IL - Institut Langevin - Ondes et Images (UMR7587)

Light emission 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 with precision. 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.

Mots clés: Absorption spectroscopy; Emission spectroscopy; Permittivity; Refractive index; Dye molecule; Emission spectrums; Fluorescence measurements; Imaginary parts; Long wavelength; Fluorophores

Domaines: Physique [physics]

Elise Bailly, Kevin Chevrier, Camilo R Perez de la Vega, Jean-Paul Hugonin, Yannick de Wilde, et al.. Method to measure the refractive index for photoluminescence modelling. Optical Materials Express, 2022, 12 (7), pp.2772. ⟨10.1364/OME.461515⟩. ⟨hal-03761944⟩