While
the determination of the dielectric function induced in a metallic nanoparticle
is obtained with the Drude consideration, in the case of NPs
population, a fill factor has to be considered. We detail Urbach and
Maxwell-Garnett laws to explain these absorption effects and an evaluation
of the experimental parameters is considered [10,11]. The UV/
Visible spectrophotometry is used to obtain the transmission spectra.
This method is not sufficient for a good approximation of all the parameters.
Several characterization techniques were used to identify the different
parameters values: Transmission Electron Microscope (TEM)
gives the average size of the NPs and the size distribution. Fill factor
is evaluated by Scanning Electron Microscopy (SEM) Measurement.
X-Rays Diffraction (XRD) Measurement informs about the cristallite
size and infrared measurement gives access to the structural influence
and refractive index evaluation of the NPs on the glass matrix. The role
of the glass impurities and the thermal conditions will be discussed.
We will show that coexistence of metallic ions and NPs occur in
these experimental conditions.