A terahertz two-wire waveguide with low bending loss

We present experimental and theoretical evidence for low loss terahertz pulse propagation along a two-wire waveguide. We find that the mode pattern at the end of the waveguide resembles that of a dipole, consistent with the fundamental transverse-electromagnetic mode of the structure. Compared to the weakly guided Sommerfeld wave of a single wire, this structure exhibits much lower bending losses. We also observe that a commercial 300 Ω two-wire TV-antenna cable can be used for guiding frequency components up to ∼0.2 THz, although they are generally designed to operate only up to about 800 MHz.