Researchers have demonstrated integrated arrays of emitters of 'optical vortex beams' on a silicon chip. Contradicting traditional conception, light in such beams does not propagate in straight rays. Instead, its energy travels in a spiral fashion in a hollow conical beam shape. The beams therefore look very much like a vortex or cyclone, with its light rays 'twisted' either left-handed or right-handed. In theory, there is no limit to how twisted the light rays can be.

Source: Optical vortices on a chip: Integra...'optical vortex beams' on a silicon chip