Pseudospin-Polarized Topological Line Defects in Dielectric Photonic Crystals

Abstract

Electromagnetic topological insulators have been explored extensively due to the robust edge states they support. In this work, we propose a topological electromagnetic system based on a line defect in topologically nontrivial photonic crystals (PCs). With a finite-difference supercell approach, modal analysis of the PCs structure is investigated in detail. The topological line-defect states are pseudospin polarized and their energy flow directions are determined by the corresponding pseudospin helicities. These states can be excited by using two spatially-symmetric line-source arrays carrying orbital angular momenta. The feature of the unidirectional propagation is demonstrated and it is stable when disorders are introduced to the PCs structure.

arXiv comment6 pages, 8 figures

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Cited by in corpus (11)

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• Dual-Polarization Second-Order Photonic Topological Insulators
• Large-area quantum-spin-Hall waveguide states in a three-layer topological photonic crystal heterostructure
• Comparative study of Hermitian and non-Hermitian topological dielectric photonic crystals
• Frequency tunable topological edge states of two-dimensional honeycomb lattice photonic crystals
• Local orbital-angular-momentum dependent surface states with topological protection
• Topological properties of two-dimensional photonic square lattice without $C_4$ and $M_{x(y)}$ symmetries
• A topological gap waveguide based on unidirectional locking of pseudo-spins
• Efficient algorithms for surface density of states in topological photonic and acoustic systems
• Self-induced nonreciprocity from asymmetric photonic topological insulators