DESIGN AND ANALYSIS OF HEPTAGONAL, OCTAGONAL, AND SPIDER-WEB PHOTONIC CRYSTAL FIBRE IN THE TERAHERTZ REGIME

Abstract

This work proposes multiple photonic crystal fibre (PCF) designs of Heptagonal, Octagonal, and Spider-Web claddings. All designs are simulated in the COMSOL Multiphysics software using the finite element method (FEM) from the computational electrodynamics. To understand the behaviour of proposed designs in Terahertz (THz) wave transmission, the core material is infused with polymers such as Teflon, chalcogens such as chalcogenide glass, or fused silica. From the perfectly matched layer, a numerical approximation, two optical losses, a very low confinement loss, and effective material loss (EML), including other optical properties that explain the behaviour of fibre, effective mode area, nonlinearity coefficient, numerical aperture, power fraction, and V parameter, have been reported with varying frequency from 0.1 𝑇𝐻𝑧 to 4.0 𝑇𝐻𝑧. By comparing all the results, these PCF designs in the fundamental mode can be used in various applications such as broadband transmission, biosensing, chemical sensing, and other THz applications.