Low loss, low dispersion and highly birefringent terahertz porous fibers

TL;DR

This paper presents the design and demonstration of porous terahertz fibers with low loss, minimal dispersion, and high birefringence, enabling improved broadband and polarization-preserving terahertz transmission.

Contribution

It introduces porous fiber designs with extended bandwidth, near-zero dispersion, and high birefringence, advancing terahertz fiber technology beyond existing solid core fibers.

Findings

Porous fibers achieve 4.5 times larger bandwidth than solid core fibers.

Designed fibers exhibit near-zero dispersion in 0.5-1 THz range.

Asymmetrical air-holes induce high birefringence (~0.026).

Abstract

We demonstrate that porous fibers have low effective material loss over an extended frequency range, 4.5 times larger bandwidth than that can be achieved in sub-wavelength solid core fibers. We also show that these new fibers can be designed to have near zero dispersion for 0.5-1 THz resulting to overall less terahertz signal degradation. In addition, it is demonstrated that the use of asymmetrical sub-wavelength air-holes within the core leads to high birefringence ~0.026. This opens up the potential for realization of novel polarization preserving fibers in the terahertz regime.