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Strong attenuation in the THz gap is always a severe problem in longdistance THz waveguiding.Even though much research on THz generation and detection techniques has been done to improve the detectable level of the THz signals, the unacceptably high dielectric loss and finite metal conductivity in this regime are still challenging for optical fiber-type or metal-type waveguide design.Hence almost all the setups for current THz application systems are constructed with planar or curved metal reflectors, which make the systems not only rigid but also vulnerable to environmental disturbance.