Undergraduate Thesis Or Project
 

Optical Modelling of Thin Films: Applying Effective Medium Theory to Mixtures of TiO₂ and SnO₂

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  • This study used SCOUT optical modelling software to create models of the reflectance and transmittance spectra generated by mixtures of titanium dioxide (TiO2) and tin oxide (SnO2). These models enabled identification of how altering the ratio of a mixture changes the optical response. By being able to identify how altering the ratio of a mixture changes the optical response of a material we can better understand how to create mixtures with optical properties that we desire. Understanding how the optical response of a material changes also improves our ability to identify the composition of mixtures by comparing the reflectance and transmittance of samples to optical models. The optical response of mixtures was simulated by taking the known indices of refraction for SnO2 and TiO2 and applying effective medium theories to create models of the indices of refraction for mixtures of the two materials. These effective medium models of the indices of refraction where then used to simulate the reflectance and transmittance of thin films that are composed of mixtures of TiO2 and SnO2. This study found that the distinct difference between the indices of refraction, as well as the difference in the location of the bandgap for TiO2 and SnO2 made it so that small variations in how much of a mixture is made up of each component material has a significant effect on what wavelengths of light are completely absorbed and how many fringes appear in the transmittance and reflectance. These results show that effective medium theories can be used to predict the optical properties of mixtures, and they can be used to distinguish between mixtures based on the relative quantities of component materials.
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