Abstract
Abstract The characteristics of a material in THz region, including its permittivity and permeability are important for developing THz devices, such as THz waveguides, substrate and phase shifter/circulator. The electric properties of crystalline dielectric sapphire, high-resistivity/low-resistivity silicon, and fused silica and the magnetic properties of ferrite from 0.2 THz to 2.0 THz have been clearly measured by terahertz time-domain spectroscopy. By detecting and analyzing the reference pulse (through the air) and the multiple-reflection pulses, including the first transmitted signal and the second transmitted signal with one round-trip traveling (through the sample), the complex permittivity and permeability could be simultaneously retrieved. Those results are consistent with the previous studies (refractive index and far-infrared absorption) but provides a more in-depth understanding of materials' electric and magnetic properties.