Figure 3
From: Photonic simulation of topological superconductor edge state and zero-energy mode at a vortex
Manifestation of photonic zero-energy modes at a vortex and at edges.
The mode at the vortex propagates counter-clockwise around the center vortex core, while the mode at the edge propagates clockwise. Azimuth-dependent off-diagonal elements in permittivity and permeability tensors are introduced to mimic a vortex with a singularity at the center.
