Fig. 4

Experimental and simulation results for polariton vortices when l = 1. a, b, g, h Near-field amplitude images at ~ 1550 cm⁻¹ for right-handed (a and g) and left-handed (b and h) circularly polarized light. c, d, i, j Numerical E_z and e, f, k, l phase distributions at ~ 1542 cm⁻¹ for right-handed (c, i, e, and k) and left-handed (d, j, f, and l) circularly polarized light. The zoom-in images of the central profile are in the lower column. The cyan/red dotted circles with numbers in the zoom-in amplitude/simulated E_z images label the central interference profiles. The black dotted circles in the phase images with numbers indicate the spiral phases. The scale bars are 2 µm in the full images and 0.67 µm in the zoom-in ones