Fig. 4
Simulated electric field distributions of the generated focused vortex beam for topological charge l = 1 at 0.83 THz. (a) Energy intensity of the longitudinal electric field of the converted OAM beam with l = 1 in the xoz plane. (b) Energy intensity of the electric field in the xoy plane at z = − 900 μm. (c) The normalized electric field intensity spectra of focused vortex beam along the x-axis at the focal plane of z = − 900 μm. Simulated electric field distributions of the generated focused vortex beam for topological charge l = 1 at 1.72 THz. (d) The energy intensity of the longitudinal electric field of converted OAM beam with l = 1 in the xoz plane. (e) The energy intensity of the electric field in the xoy plane at z = − 900 μm. (f) The normalized electric field intensity spectra of the focused vortex beam along the x-axis in the xoy plane at the focal plane of z = − 900 μm.
