Dirac-vortex topological photonic crystal fibre

• 作者: Hao Lin Ling Lu
• 来源期刊: 光：科学与应用（英文版）
• 年，卷（期）: 2020,（6）
• 所属期刊栏目: Original Articles
• 页码范围: 1850-1856
• 页数: 7页
• 语种: 英文

摘要

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 generalised 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-polarisation single-mode for a bandwidth as large as one octave.