Design and optimization of terahertz directional coupler based on hybrid-cladding hollow waveguide with low confinement loss*
Yu Ying-Ying†, Li Xu-You, Sun Bo, He Kun-Peng
       
Intensity distributions of the proposed coupler at an operational frequency of 0.9913 THz for (a) x polarization, odd mode; (b) x polarization, even mode; (c) y polarization, odd mode; (d) y polarization, even mode.