A hollow-core anti-resonant fiber for the THz regime is proposed and demonstrated. The proposed fiber is the hexagonal core shape which is directly extruded using a conventional 3D printer. Experimental results show that by using cyclic olefin copolymer (COC), the proposed fiber design provides a low attenuation of ∼3 dB∕m at ∼ 0.86 THz and ∼15 dB∕m at ∼ 0.42 THz.

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A polarization-maintaining and polarization-filtering hollow core fiber with nested anti-resonant nodeless tubes for the THz regime is proposed. The model is designed by the finite element method to operate at 1.0 THz using TOPAS copolymer as the fiber material. The proposed structure consists of four outer tubes with one inner tube each in the orthogonal arrangement. The fiber was optimized to obtain the lowest loss by varying the tube thickness. The simulation results show that the thickness of 0.09 mm was suitable for a low loss of 0.2 dB/m operating at 1.0 THz. The fiber property of high birefringence @ 1.5x10-4 was made by introducing unequal radial distances between the outer and inner tubes of the orthogonal arrangement. In addition, at a particular difference of the radial distance, it was found that the proposed fiber can act as a polarization filter indicating by having a high crosstalk.