Extremely Low Loss, Dispersion Flattened Polarization Maintaining Fiber in THz Regime

In this paper, a new kind rectangular core hexagonal lattice photonic crystal fiber is reported for efficient transmission of terahertz (THz) signal. Comsol V4.2 software is used to investigate the guiding properties of that proposed fiber. The numerical analysis reported that this proposed fiber exhibits extremely low effective absorption loss of $0.038 \mathrm {c}\mathrm {m}^{-1}$ at 1 THz and almost zero flattened dispersion of 0. 77 x00B1; 0.03 ps/THz/cm over 0.8–1.2 THz. Along with these properties, ultrahigh birefringence of 0.035 can be achieved for optimal geometric structure at 1.2 THz. Other guiding characteristics such as bending loss, confinement loss are also discussed in this article. This fiber can be fabricated by using the ongoing technology. So that, we hope this fiber will be a good candidate in THz wave propagation applications.