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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