Broadband THz guidance in helical waveguides

摘要

We experimentally observe broadband Terahertz pulse propagation in flexible metal helix waveguides. Our measurements are in very good agreement with finite-difference time domain simulations. The waveguides have a constant attenuation coefficient of 0.2 cm in the region between 0.3 and 0.9 THz. The measured temporal signals indicate that the THz pulse is confined to the core of the helical waveguide. Moreover, a constant magnitude of the group-velocity dispersion parameter of less than 1 ps THz cm in the region from 0.5 THz to 0.9 THz reveals the low dispersive behavior of the helical waveguide.