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特許 権利維持 An optical vortex (also known as a screw dislocation or phase singularity) is a zero of an optical field, a point of zero intensity. Research into the properties of vortices has thrived since a comprehensive paper by Nye and Berry, in 1974,[1] described the basic properties of "dislocations in wave trains". The research that followed became the core of what is now known as "singular optics".