Figure 2
From: Spiniform phase-encoded metagratings entangling arbitrary rational-order orbital angular momentum
Optical vortices with integer q values. (a) Simulated intensity and phase profiles for q=1, 2, 3 and 4, whose Q=0.798, 1.4, 2.126 and 2.8, respectively. (b) Measured intensity profiles of the far field. (c) Experimental interference patterns with plane (left) and spherical (right) waves. (d) Phase profiles retrieved from experimental interference patterns with planar waves. Φ denotes the angular coordinate. (e) Quantitative comparison of the azimuthal phase shift (ΔP≡P(Φ)−P(Φ=0), where P is the phase of this vortex beam) between the experiment (curves) and simulation (square boxes). Data are obtained along the black dashed circles as shown in d.
