Fig. 1. Schematic of FDTD simulation domain

Fig. 2. (Left) wavefront distributions and (right) spiral spectra of LG beam. (a1)(a2) l=1, in waist plane; (b1)(b2) l=3, in waist plane; (c1)(c2) l=1, in detection plane; (d1)(d2) l=3, in detection plane

Fig. 3. (Left) wavefront distributions and (right) spiral spectra of LG beam in detection plane after scattering. (a1)(a2) l=1, particle center at (13Δs,0,64Δs), rd=20Δs; (b1)(b2) l=1, particle center at (13Δs,0,64Δs), rd=25Δs; (c1)(c2) l=3, particle center at (13Δs,0,64Δs), rd=20Δs; (d1)(d2) l=3, particle center at (25Δs,0,64Δs), rd=20Δs

Fig. 4. Pl of LG beam versus particle radius at different positions. (a) x=25Δs; (b) x=13Δs

Fig. 5. Schematic of relative positions between incident beam and scattering particles. (a) Particle moving along x-axis; (b) particle moving along z-axis

Fig. 6. Pl of LG beams with different topological charges versus particle off-axis distance. (a) l=1; (b) l=2; (c) l=3; (d) l=4

Fig. 7. Pl for of LG beams with different topological charges versus plane distance between particle and waist plane. (a) l=1; (b) l=2; (c) l=3; (d) l=4

Fig. 8. Schematic of scattering of ellipsoid particles. (a) Change of radii; (b) change of orientation

Fig. 9. Pl of LG beams with different topological charges versus ellipsoid-particle-radii ratio. (a) rb/ra; (b) rc/ra

Fig. 10. Pl of LG beams with different topological charges versus orientation angle of ellipsoidal particles