Low loss porous-core photonic crystal fiber for long-haul broadband THz transmission

This paper presents a novel porous-core photonic crystal fiber (PCF) having extremely low material absorption loss at terahertz window suitable for THz transmission. Finite element method (FEM) is used to investigate the properties of the proposed PCF with a porous core surrounded by a compact cladding structure having hexagonal air holes. Simulation results reveal that effective material loss (EML) of ~0.028 cm^-1 can be achieved at operating frequency of 1 THz which is only 12.5% of the bulk material loss of Topas. Additionally, the confinement loss of ~0.0005 cm^-1 is obtained at 1 THz which is relatively low with a nearly zero flat dispersion profile of 0.196 ± 0.183 ps/THz/cm which are significant features for long distance broadband THz transmission.