Fig. 1
From: Spin-orbit-locked hyperbolic polariton vortices carrying reconfigurable topological charges
Polariton vortex, dispersion, simulation and experimental results for an hBN flake excited through an Au spiral disk with m = 4. a Schematic of the geometry and experimental setup. b AFM image of Au disk shaped as a left-handed Archimedean spiral with four arms, rmax and rmin are the maximum and minimum radii, g is their difference, ϕ is the azimuthal angle and rAS(ϕ) is the distance from the center (O). c Dispersion of kt for the sample in panel b. Purple spheres and pink curve are experimental and calculated results, respectively. d–i Near-field amplitude images at ~ 1546 cm−1 (d and e), simulated Ez (f and g), and phase (h and i) distributions at ~ 1546 cm−1. Top and bottom images are obtained under RCP and LCP light illumination, respectively. The black dotted circle in the phase images indicates the spiral phase. The scale bar is 2 µm in all panels