Theoretical Analysis of the Influence of the Refractive Index on Electromagnetic Wave Propagating through Manganese Sulphide [MnS]

The theoretical analysis of the Electromagnetic wave propagation through chemically bath deposited manganese sulphide thin film and optical properties were studied using beam propagation technique in which a scalar wave is propagated through the material thin film deposited on a substrate with the assumption that the refractive index of the medium has homogenous reference refractive index reference term, nref and a perturbed refractive index term, representing the deposited thin film medium is presented in this work. These are substituted into a defined scalar wave equation in which the appropriate Green's Function was defined on it and solved using series solution technique in conjunction with Born approximation method in order to obtain a model equation of wave propagating through the thin film. This was transformed to Voltera equation and used in computing the propagated field for different input regions of the field wavelength such as ultraviolet, visible and infrared region respectively during which the influence of the influence of the refractive index on the propagating wave through the thin film was considered. The results obtained from the computed field were used in turn to compute the band gaps and optical properties of the thin film.