Figure 5 | Scientific Reports

Figure 5

From: Near-field collimation of light carrying orbital angular momentum with bull’s-eye-assisted plasmonic coaxial waveguides

Figure 5

Dependence of the beaming effect on the topological charge.

(a) Normalized propagation constants and propagation lengths for different topological charges. (b) Theoretically calculated and (c) experimentally measured petal beams at z = 10 μm. The corresponding topological charges are marked in (b). The length and width along the x and y directions in all panels are 20 μm.

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