Topological photonic crystal fibers based on bivortex line defects in three-dimensional photonic topological insulators
Xiao-Hui Gou, Yan-Chen Zhou, Hua-Shan Lai, Cheng He, and Yan-Feng Chen
Phys. Rev. B 113, L140101 (2026) - Published 20 April, 2026
Fabry-Pérot quasinormal modes for topological edge states
Marc Martí Sabaté, Benjamin Vial, Richard Wiltshaw, Sébastien Guenneau, and Richard V. Craster
Phys. Rev. B 113, L140102 (2026) - Published 20 April, 2026
Topological edge states are typically described using infinite periodic models, yet real devices are finite and open. Here, the authors develop a quasinormal mode framework to characterize quantum valley Hall edge states in finite systems. They show that these states form a discrete complex spectrum analogous to a dispersive Fabry–Pérot system. This approach provides physical insight into topological waveguiding and offers a powerful framework for analysing finite topological devices.










