Drude
model used to describe dielectric behaviors for metals was applied in this analysis
for WCx film. Its expression could be written as follows:
where A
is the polarization, B is the damping related constant and C is the inverse of the
plasma wavelength.
In
addition, two absorption bands with Lorentz function were added to Drude model.
The dielectric constants of each band (m=1 and 2) are calculated with the expressions:
where A,
lo and g are the intensity,
the central wavelength and the width of the band respectively. Total
dielectric function will be the sum of the different terms from
each band.
