Dirac-vortex topological photonic crystal fibre
arXiv:2011.10370 · doi:10.1038/s41377-020-00432-2
Abstract
The success of photonic crystal fibres relies largely on the endless variety of two-dimensional photonic crystals in the cross-section. Here, we propose a topological bandgap fibre whose bandgaps along in-plane directions are opened by generalized Kekulé modulation of a Dirac lattice with a vortex phase. Then, the existence of mid-gap defect modes is guaranteed to guide light at the core of this Dirac-vortex fibre, where the number of guiding modes equals the winding number of the spatial vortex. The single-vortex design provides a single-polarization single mode for a bandwidth as large as one octave.
arXiv comment8 pages, 6 figures
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- Second-order topological modes in two-dimensional continuous media
- Unveiling spin-orbital angular momentum locking in photonic Dirac vortex cavities
- Simulating graphene dynamics in one-dimensional modulated ring array with synthetic dimension
- Observation of Embedded Topology in a Trivial Bulk via Projective Crystal Symmetry
- Topological photonic crystal fibre