Improve the Properties of Flattened Dispersion Porous Core Photonic-Crystal Fiber for Terahertz Transmission

Abstract

In this paper, a solid core photonic crystal fiber (SC-PCF) for dispersion improvement and birefringence enhancement in the terahertz frequency range is proposed. The suggested SC-PCF structure contains three hexagonal layers of circular air holes in the cladding, which promises to yield very large birefringence and flat dispersion. Assuming TOPAS as the background material, the COMSOL software multiphysics 6.1, which is based on the finite element method, was used to investigate its properties. The results show that over a frequency range of 0.7–1.3 THz, the SC-PCF has negative and flat dispersion of -43.2959 Ps/THz/cm, a high birefringence of 3.7×10⁻³, and a high power fraction of 51% with a size of circular porosity of 28%. These findings suggest that the SC-PCF could be highly effective for applications in optical communication and sensing technologies. Further research will focus on optimizing the structure to enhance its performance across different wavelengths and operational conditions. Critical parameters such as confinement loss and v parameters are also discussed in detail. So, the designed SC-PCF can be useful for polarization-maintaining applications.