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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A novel porous-core kagome lattice photonic crystal fiber (PCF) is designed and analyzed in this paper for terahertz (THz) wave guidance. Using finite element method (FEM), properties of the proposed kagome lattice PCF are simulated in details including the single-mode propagation, dispersion profile, fraction of power in the porous-core with different core porosity, effective material loss (EML) and confinement loss. Simulation results indicate that 82.5% of bulk material loss of Topas can be reduced by using core porosity of 70%. The calculated EML is as low as 0.035 cm -1 at operating frequency 1 THz. In addition, the proposed PCF also exhibits relatively low confinement loss and a much more flattened dispersion profile with single mode propagation.Index Terms-Effective material loss, kagome lattice PCF, terahertz wave guidance. 0733-8724 (c)

A hollow-core fiber with nested anti-resonant node-free cladding tubes suitable for broadband THz guidance with low transmission losses is proposed. It is shown that the tube separation and tube thickness of the inner elements have a significant effect on the confinement loss and effective material loss of these fibers in the THz band. Using TOPAS copolymer, the proposed fiber was optimized for operation at 1 THz and it is predicted from numerical simulations that loss can be reduced to as low as 0.05 dB/m with a 0.6 THz wide dispersion flattened bandwidth.