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Opt Express. 2011 Oct 24;19(22):21457-66. doi: 10.1364/OE.19.021457.

Dipole azimuthons and vortex charge flipping in nematic liquid crystals.

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1
Nonlinear Physics Center, Research School of Physics and Engineering, The Australian National University, Canberra ACT 0200, Australia. yvi124@physics.anu.edu.au

Abstract

We demonstrate self-trapped laser beams carrying phase singularities in nematic liquid crystals. We experimentally observe the astigmatic transformation of vortex beams into spiraling dipole azimuthons accompanied by power-dependent charge-flipping of the on-axis phase singularity. The latter topological reactions involve triplets of vortex lines and resemble pitchfork bifurcations.

PMID:
22108995
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