THz stop bands by using metal slits in tapered parallel-plate waveguide

We present experimental and finite-difference time-domain (FDTD) simulation studies on the THz Bragg stop bands carried out by using metal slit arrays positioned at the center of the air gaps in tapered parallel-plate waveguides (TPPWGs) (Lee et al., 2010). The properties of THz stop bands determined in the simulations show excellent agreement with those observed experimentally. Recently, researchers have investigated the use of a TPPWG without a cylindrical silicon lens for improving THz coupling to the plate-separation air gap (Kim et al., 2010). The TPPWG has many advantages when forming Bragg stop bands using slits such as strong THz coupling, easy setup, and long scan etc.