Measurement of dielectric properites of medium using wave transmissibillity in terahertz region

Abstract

An experimental method to measure frequency-dependent dielectric properties of thin medium was proposed. The reflected and transmitted terahertz (THz) waves were utilized to predict the properties of the medium. The propagated wave through the medium were analyzed as a pulse wave using Helmholtz equation with the dielectric properties. The boundary conditions of the medium were determined by continuity conditions between the medium. The wave transmissibility of the medium was predicted by the wave analysis. Experiments were performed to measure the wave transmissibility of the medium. The reflected waves on the surface of the medium were measured using pitch-catch transducers. The measured waves were used to obtain the transfer function. Wave speeds of reflected THz pulse were measured through the transfer function method. The numerical analysis to measure the dielectric properties were proposed using the wave analysis. The dielectric constants and loss factors were obtained through the proposed method.