Characteristics of a series connected two metal wire waveguide in THz frequency range

This paper reports on the guidance properties on the surface of copper wire and stainless steel wire in the terahertz frequency range. The used metal wires have 0.5mm diameter. The dominant transverse-magnetic (TM₀₁) surface wave mode (Sommerfeld wave) of the metal wire waveguide has very low attenuation and group velocity dispersion. All the other higher modes vanished almost immediately after coupling with the wire because of their high attenuation. Because of low attenuation and group velocity dispersion in the THz frequency range, metal waveguides have many possible applications in THz spectroscopy and imaging. Although there are many possible applications for metal wire waveguides, they have very weak guidance properties. In this research, a report on the guidance properties of copper wire and stainless steel wire that have different conductivities is presented.