Fig. 1. Comparison of intensity distributions of higher-radial-order LG beams and their corresponding Bessel beams. (a), (b) l=0, p=15. (c), (d) l=1, p=15. (e), (f) Comparisons of intensity distributions of the LG (blue lines) and Bessel (red lines) beams along the radial direction. The dotted black lines in (e) and (f) depict the similarity of intensity profiles.

Fig. 2. (a), (b) Gouy phases of Bessel and LG beams with different transverse parameters, respectively. (c) Canonical Poincaré sphere. (d) Gouy phase difference between LG150 beam and its corresponding zeroth-order Bessel beam versus propagation distance. (e) Gouy phase-induced self-accelerated OA of zeroth-order superimposed beam.

Fig. 3. Experimental setup. HWP, half-wave plate; BS, beam splitter; PBS, polarized beam splitter; SLM, spatial light modulator; QWP, quarter-wave plate; L, lens; F, filter; M, mirror; P, polarizer. Insets: computer-generated holograms.

Fig. 4. Self-accelerated OA of a scalar (zeroth-order) quasi-non-diffracting beam. (a) 3D intensity profile of light field composed by an LG150 component and a corresponding Bessel component. (b) Intensity distributions of total field, horizontal, and vertical components at the z0, z1, and z2 planes. The white arrows denote the orientation of polarizer. (c) Upper graph: comparison of theoretically calculated (blue curve) and measured (red squares) polarization orientations; below graph: measured polarization ellipticities. Both are the measured results on the axis.

Fig. 5. Self-accelerated OA of vector non-diffracting beams. (a) Higher-order Poincaré sphere composed by two kinds of quasi-non-diffracting components carrying OAMs. Insets: |R+1⟩ and |L+1⟩, intensity and phase distributions; |H+1⟩, |A+1⟩, |V+1⟩, and |D+1⟩, polarization orientation distributions of four typical vector modes on the equator. (b) Schematic polarization transformation of vector non-diffracting beam and the corresponding rotation of petal-like intensity (horizonal component Ix). Arrows: local polarization orientations. (c) Correlation of rotation angular parameters and spatial mode indices. (d) Calculated intensity distribution in the y–z plane. (e), (f) Measured intensity distributions of the total and diagonal components at the z1 and z2 planes.

Fig. 6. Self-accelerated OA of different vector quasi-non-diffracting beams. Backgrounds: intensity distributions of the vertical component; white lines and values denote the theoretical rotation angles.