Determination of the Refractive Index of Molybdenum Using a Spectrophotometric Method

The refractive indexes of thin films are determined by spectrophotometric measurement in the ultraviolet-to-near-infrared spectral range on a high-absorption metal, molybdenum, as an example.In our theoretical derivative, the refractive indexes of a substrate with and without low absorption are calculated first and then that of the combined film stack is calculated.Both solutions are obtained by the Newton-Raphson iteration method.The calculated refraction index is 1.64-2.88and the extinction coefficient is 2.76-4.52,which are within the measured ranges for the Mo film.Both indexes increase monotonically with the wavelength in the visible and near-infrared ranges.