Composite multi-vortex diffraction-free beams and van Hove singularities in honeycomb lattices


We find that honeycomb lattices support diffraction-free multi-vortices above the van-Hove singularity. Exact solutions for the spinor components are obtained in the Dirac limit. Right at the singularity the solutions become infinite extend stripes. 
DOI: 10.1364/OL.40.001037

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