TMM computed Graphene optical properties: Comparison to experimental data

Abstract

Graphene is a revolutionary two-dimensional substance whose unusual features have piqued the interest of scientists and technologists alike. Owing to the structure and behavior of the electrons in the material, it exhibits fascinating optical properties. In this study, the transmittance, reflectance, and absorbance were investigated using a Python-based version of the Transfer Matrix Method. The computations are carried out using experimental refractive indices. The derived results agree quite well with the existing experimental results, even better than the two-dimensional Dirac fermions model. Specifically, in the UV spectrum, the observed transmittance behavior was successfully mirrored in the case of the CVD monolayer graphene. Our results also suggest that transmittance can be used as an efficient probe for determining the thickness of graphene membranes. However, the transmittance did not vary linearly with the number of layers, as the thickness increased. Although it was demonstrated that it could be modeled perfectly by linear regression for the first five layers and less conveniently for the first ten layers, the entire shape is modeled by a second-order polynomial function. The dependence of the optical properties of graphene on the angle of incidence, wavelength, and polarization has been investigated extensively.