Tunable Optical Vortices Generated by Self-Assembled Defect Structures in Nematics

Péter Salamon, Nándor Éber, Yuji Sasaki, Hiroshi Orihara, Ágnes Buka, Fumito Araoka

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A stable lattice of topological defects occurring at the electric reorientation of a nematic fluid is studied by quantitative polarimetry and laser diffraction. Generation of optical vortices by topological defects is demonstrated in the case of two distinct mechanisms. First, individual defects convert circularly polarized light partially into a vortex beam with opposite handedness, while beams diffracted on the defect lattice do not carry vorticity. Second, dislocation of the lattice structure is a topological defect on a larger length scale; then beams diffracted on a single dislocation possess optical vortex character. The vortex-generation efficiency is tunable by the applied voltage.

Original languageEnglish
Article number044008
JournalPhysical Review Applied
Issue number4
Publication statusPublished - Oct 3 2018


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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