An electrically controlled liquid crystal Fresnel lens reveals an optical vortex's topological charge by producing |ℓ| dark spots in the focal plane, with the sign shown by the tilt direction.
Nature Photonics, 1–8 (2025)
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Phase Topology Stability of an Optical Vortex via an Electrically Controlled Twist-Planar Oriented Liquid Crystal Fresnel Lens
An electrically controlled liquid crystal Fresnel lens reveals an optical vortex's topological charge by producing |ℓ| dark spots in the focal plane, with the sign shown by the tilt direction.