The Vanadium dioxide is a thermochromic material, which undergoes a considerable change in optical properties on phase transition from the semiconductor ⇄ metal state at a critical temperature of 68 °C. This change in optical properties is of great interest in industrial applications. The present study consists in exploiting the optical properties in this transition region to control and manipulate the optical behavior of this material in its semiconductor state. To make it very functional, we propose to control its optical response by changing the number of Drude-Lorentz oscillators in its semiconductor state during ellipsometric spectroscopy, by decreasing this number from 7 to 4 oscillators.For this purpose, we extracted and analyzed the optical constants of a 100 nm thick VO₂ thin film, including the dielectric function, refractive index, extinction coefficient, absorption coefficient, reflectivity, transmittivity, and absorbance Coeff A, in the spectrum of photons with energy in the range: 0,001242≤ћω(eV)≤6. The simulation and analysis of these properties, allow us to master and identify the practical utility of this material, in various applications such as smart windows, photovoltaic, paints to increase energy efficiency in buildings and infrared (I.R) or ultraviolet (U.V) detectors. In this context, we will also compare our results with those of the literature.