We report on the realization of on-demand reconfigurable arbitrary arrays of microscopic optical vortex generators in chiral liquid crystals. These generators are optically inscribed in frustrated cholesteric films by means of the laser-induced local winding of the chiral liquid crystal mesophase. This leads to the storage of microscopic, metastable, topological defect structures endowed with space-variant birefringent properties. Such structures are shown to produce optical vortices with a well-defined orbital state as a result of a spin-to-orbital angular momentum conversion process.
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Yang et al. (2013) studied this question.
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