Swanepoel method: Determination of Refractive index
of single
absorbing thin film
- Step.1 The transmission spectra has been measured.
- Step.2 The transmission_max and transmission_min envelops has to be drawn.
- Step.3 Now we have the T_max and T_min at every measured wavelength.
- Step.4 Leaving the highly absorbing region,i.e the absorption edge, choose the transparent region.
- Step.5 Aprrox. for 10 to 12 wavelengths mark the T_max and T_min.
- Step.6 Use these values and the calculator below to determine the refractive index of the film at all the wavelengths where you have noted the Tmax and Tmin.
- Later one can plot refractive index Vs wave length plot in any plotting program
- I have added the entry called wavelength, only to indicate where you are calculating the refractive index.
Note: The instructions are not complete but the calculator is useful for those who knows what to be calculated. Please read the article by Swanepoel (http://iopscience.iop.org/0022-3735/16/12/023/) then you can see the utility of this calculator. Enjoy
