Enhanced coupling property using a conical metal wire waveguide in the terahertz frequency range

We investigated the coupling properties of a metal wire waveguide in the terahertz (THz) frequency range using theoretical simulations and experiments. Because a conical wire tip has a smaller tip diameter than a cylindrical wire tip, it has a greater THz field density than a cylindrical wire tip. After the coupling of the THz pulse to the receiver (Rx) using a 1-mum-diameter conical-wire tip, the detected THz pulse increased 5.3 times compared with when the 500-mum-diameter cylindrical-wire tip was used. This result agrees with that of theoretical simulations using high-frequency structure simulation (HFSS).