Fig. 2From: Coaxial superposition of Bessel beams by discretized spiral axiconsAzimuthal harmonics \(\tilde {n}\) contributing to the field according to Eq. 4. Here, the cases (a) N=3 (b) N=4 (c) N=5 (d) N=6 are shown as a function of r. For all examples, we assume rp=32 μm,M=15 and z=12 mmBack to article page