Analysis of relaxation in terahertz spectrum

There is a close correlation between dielectric loss and complex dielectric constant of non-magnetism medium, and the former is the macroscopical representation for the later. Relaxation is one of important cause of the dielectric loss. This paper educes the complex dielectric constant and complex refractive index of non-magnetism medium in Terahertz spectrum on the base of initial Drude Model, analyzing their characteristics; it also calculates the Argand Picture of Drude Model, comparing with the counterpoint of Debye Model.