Fig. 3: Diffraction comparison between perfect vortex beam (PVB) and achromatic non-diffracting perfect vortex beam (ANPVB). | Nature Communications

Fig. 3: Diffraction comparison between perfect vortex beam (PVB) and achromatic non-diffracting perfect vortex beam (ANPVB).

From: Ultrabroadband, achromatic, and non-diffracting perfect optical vortex generation via radial momentum control in dielectric metasurfaces

Fig. 3: Diffraction comparison between perfect vortex beam (PVB) and achromatic non-diffracting perfect vortex beam (ANPVB).

a, b x-z intensity profiles for the conventional PVB of (f = 18 mm, l = 30, α = 0.04733, R’ = 0.54 mm) and ANPVB of (α = 18, β = 0.8, γ = 3, t = 700, δ = 1, R = 0.54 mm, l = 30), respectively. a1–a10 and b1–b10 Corresponding x-y intensity distributions at z = 3, 6, 9, 12, 15, 18, 21, 24, 27 and 30 mm for PVB and ANPVB, respectively. Intensity profiles for both the xy and xz planes are individually normalized for each image. As the propagation distance increases, the diameter of the PVB in (a1–a10) expands, while the diameter of the ANPVB in (b1–b10) remains approximately constant. c Beam radius versus axial position. d Plot of the relative variation of diameters with respect to axial positions.

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