A novel plasmonic THz fiber is described that features two metallic wiresthat are held in place by the porous dielectric cladding functioning as amechanical support. This design is more convenient for practical applicationsthan a classic two metal wire THz waveguide as it allows direct manipulationsof the fiber without the risk of perturbing its core-guided mode. Notsurprisingly, optical properties of such fibers are inferior to those of aclassic two-wire waveguide due to the presence of lossy dielectric near aninter-wire gap. At the same time, composite fibers outperform porous fibers ofthe same geometry both in bandwidth of operation and in lower dispersion.Finally, by increasing cladding porosity one can consistently improve opticalproperties of the composite fibers.
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