Terahertz Dielectric Properties of Polymers

Terahertz Dielectric Properties of Polymers

The terahertz dielectric properties of polymers were characterized by transmission terahertz timedomain spectroscopy (THz-TDS) in the frequency range extending from 0.2 to 3.0 THz. The terahertz absorption spectra, the refractive indices and the dielectric functions of various polymer materials were measured and compared. The variation of the refractive index of the polymers was less than 6 %, ranging from 1.4 to 1.8, within the investigated frequency range, but the absorption properties of the polymers showed very different frequency-dependent behaviors. The loss mechanism for terahertz radiation in polymers is discussed by correlating the absorption coefficients and the loss tangents (tan ) of the materials.j

The terahertz dielectric properties of polymers were characterized by transmission terahertz timedomain spectroscopy (THz-TDS) in the frequency range extending from 0.2 to 3.0 THz. The terahertz absorption spectra, the refractive indices and the dielectric functions of various polymer materials were measured and compared. The variation of the refractive index of the polymers was less than 6 %, ranging from 1.4 to 1.8, within the investigated frequency range, but the absorption properties of the polymers showed very different frequency-dependent behaviors. The loss mechanism for terahertz radiation in polymers is discussed by correlating the absorption coefficients and the loss tangents (tan ) of the materials.j