We report on the numerical design optimization of a new kind of relatively simple porous-core photonic crystal fiber (PCF) for terahertz (THz) waveguiding. A novel twist is introduced in the regular hexagonal PCF by including a diamond shaped porous-core inside the hexagonal cladding. The numerical results obtained from an efficient finite element method (FEM) which confirms a high-birefringence of the order 10-2 and low effective material loss of 0.07 cm-1 at 0.7 THz operating frequency. The proposed PCF is anticipated to be useful in polarization sensitive THz appliances.

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We report on a new kind of dual-hole unit based porous-core hexagonal photonic crystal fiber (H-PCF) for lowloss guidance of THz radiation. The proposed fiber can offer simultaneously high birefringence and low effective material loss (EML) in the frequency range of 0.5-0.85 THz with single mode operation. An air-hole pair is used inside the core instead of elliptical shaped air-holes to introduce asymmetry for attaining high birefringence; where the birefringence can be enhanced by rotating the dual-hole unit axis of orientation. The proposed H-PCF provides a birefringence of ~0.033 and an EML of 0.43dB/cm at operating frequency of 0.85 THz.

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