Modified Lorentz Model-Based ADE-WLP-FDTD Method Simulation on THz Wave Propagation Properties of Tumor Tissue

An auxiliary differential equation (ADE) finite-difference time-domain (FDTD) method based on the weighted Laguerre polynomials (WLP) algorithm is developed to study wave propagation in biological tissue in the Terahertz (THz) frequency band. The relative permittivity of dispersive tissue can be expressed by the double Debye model or Cole–Cole model, which can be transformed into the modified Lorentz model by using the Padé approximation technique. The modified Lorentz model is numerically solved by means of the ADE-WLP-FDTD method. Numerical results validate the accuracy and efficiency of the proposed method. The effects caused by the slide and medium parameters on THz waves propagation properties of biological tissue are investigated. This letter enriches the high efficient ADE-WLP-FDTD method for terahertz imaging and tumor diagnosis to detect medium parameters of biological tissue.