Topological one-way Weyl fiber

TL;DR

This paper demonstrates a topological fiber state in a Weyl gyromagnetic photonic crystal fiber, enabling robust one-way photon transport through topologically protected states induced by Weyl points.

Contribution

The study introduces a novel topological fiber state in a Weyl photonic crystal fiber, achieved by magnetic biasing to create Weyl points supporting one-way fiber modes.

Findings

Confirmed one-way Weyl fiber states via electromagnetic simulations.

Showed robustness of these states against metallic obstacles.

Identified transition from Weyl surface states to fiber states.

Abstract

Topological photonics enables unprecedented photon manipulation by realizing various topological states, such as corner states, edge states, and surface states. However, achieving a topological fiber state has remained elusive. Here, we demonstrate a topological fiber state in a Weyl gyromagnetic photonic crystal fiber. By applying an in-plane magnetic bias to a gyromagnetic photonic crystal fiber with broken parity-inversion symmetry, we create an asymmetrical Weyl bandgap that supports one-way fiber states associated with type-II Weyl points. Dispersion and topological invariant calculations reveal the transition from Weyl surface states to one-way Weyl fiber states. Electromagnetic field simulations confirm the existence of one-way Weyl fiber states and their robust transport in the presence of metallic obstacle along the transport path. Our findings offer an intriguing pathway for exploring novel topological states and guiding the design of topological fibers.