Research Article

Fresnel Lens with Embedded Vortices

Figure 8

Fresnel lens with lattice of fractional vortices with two positive and two negative topological charge vortices, each of magnitude 3.5 embedded at off-axis locations. (a) Phase distribution displayed on SLM. (b) Simulated intensity pattern near the focal plane. (c) Experimentally observed intensity distribution near the focal plane. (d) Distribution of topological charge in the intensity pattern.
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(a)
249695.fig.008b
(b)
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(c)
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(d)