We present a liquid crystal (LC) optical vortex (OV) beam generator that is tuneable in both wavelength and orbital angular momentum state. Two-photon polymerization direct laser writing is used to structure the director profile of a polymerizable LC in 3-dimensions to form a helicoidal phase plate. Here, we demonstrate an OV beam generator that can be electrically tuned to produce any integer or fractional OV from zero to second order, for incident wavelengths in the range 490 nm and 780 nm. A range of techniques are employed to characterize and verify the OV beam generation at different voltages.
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Nourshargh et al. (2024) studied this question.
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