Penrose lattice of optical vortices in a nematic liquid crystal imaged through cross polarizers.

From the article:

Harnessing Optical Vortex Lattices in Nematic Liquid Crystals
R. Barboza, U. Bortolozzo, G. Assanto, E. Vidal-Henriquez, M. G. Clerc, and S. Residori
Phys. Rev. Lett. 111, 093902 (2013)

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