Low Loss and Dispersion Flattened Single Mode Microstructure Fiber in Terahertz Regime

Abstract

A circular porous core microstructure optical fiber is proposed and it's guiding properties are analyzed for efficient terahertz wave propagation. By using finite element method based software the propagation mechanism of the proposed very simple fiber is explored. Numerical results confirm that this porous core fiber exhibits extremely low effective material loss of 0.04 cm−1at 1 THz and low dispersion of $\pmb{0.85\pm 0.04}\mathbf{ps}/\mathbf{THz}/\mathbf{cm}$ from 0.9 to 1.4 THz. Moreover, the other guiding characteristics including different loss mechanism, actual modal area and single-mode test conditions are analyzed. The offered fiber is very simple and may be easily manufactured by adopting modern fabrication technique. We hope, this fiber may be a handy one in THz wave application.