Investigation of Graphene Optoelectronic Properties in Sub-100 THz Band

This paper investigates the optoelectronic properties of graphene operating in the 0.1 ? 100 THz frequency band. The graphene surface conductivity is calculated using Kubo formula and the results used to calculate the complex relative permittivity and the complex refractive index. The calculated results reveal that the real parts of the interband and intraband components of graphene surface conductivity becomes equal at certain frequency, fcross, which is an increasing function of chemical potential ?c. Operating above fcross makes the contribution of the interband component higher than the contribution of the intraband component. At ?c = 0.1 and 0.2 eV, fcross is equal 21.7 and 54.4 Thz, respectively.