A model of the propagation of a terahertz pulse through ceramics based on hydroxyapatite

Computer models of transmission of terahertz (THz) radiation through samples of porous composite ceramics based on hydroxyapatite (HA) with carbon nanotubes (CNTs) additives are developed by using finite element method. The models allowed us to estimate the influence of CNTs additives with 0.1 and 0.5 wt.% concentrations on the structure and optical properties of the samples. Optical properties of the model samples, such as refractive index and absorption coefficient, were determined by using the modeling results of the intensity and transmission rate of THz radiation. It was found, that the increasing of the absorption coefficient and the decreasing of the refractive index are observed with an increase of the porosity of the material, which is due to the denser structure of the material with addition of CNTs. The obtained optical parameters of the HA and HA-CNTs samples models have a qualitative agreement with experimental data and with the literature parameters of bone tissues.