Optical vortices generation in nematic liquid crystals.
Laluque A.S., Yunda J.P., Zappone B., De Luca A., Infusino M.
II - Fisica della materia
Aula 32B-2 - Martedì 18 h 09:00 - 13:00
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Optical vortices are light beams carrying orbital angular momentum. They are the subject of an intense research activity due to their many applications in different fields such as quantum computing, optical manipulation of micro-particles and high resolution optical microscopy. We demonstrated that optical vortices can be generated by using the spontaneous formation of dislocations in periodic structures based on liquid-crystal materials. In particular, we studied the formation of a periodic array of electro-convective instabilities in nematic liquid crystal with negative dielectric anisotropy in the presence of charged impurities. The optical vortices are produced by diffraction of light from dislocations in the periodic array.