Fig. 5: Vortex polarization.
From: Experimental observation of topological Dirac vortex mode in terahertz photonic crystal fibers
a Simulated electric field vector distribution of the DVM mode, indicating a vortex property. b1–f1 Simulated mode patterns excited by linear polarization at varied angles at 0.3 THz within the region marked by the square in (a). b2–f2 Corresponding experimental demonstration of the DVM mode patterns
