Abstract
The optical constants (the refractive index n, the absorption index k and the absorption coefficient α) of Bi2 Te3 thin films were determined in the wavelenght range of 2.5 to 10 μm. The shape of the absorption edge in Bi2Te3 thin films has been determined from transmittance and reflectance measurements. The edge is of the form expected for direct transition corresponding to Eg = 0.21 eV. The optical constants were used to determine the high frequency dielectric constant eo = 58, the optical conductivity σ = + σ2 as well as the volume and surface energy loss functions. All these parameters were used to get some information about the intraband and interband transitions.
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