Tiny beam shaper fabricated on the tip of a fibre creates twisted light

https://physicsworld.com/a/tiny-beam-shaper-fabricated-on-the-tip-of-a-fibre-creates-twisted-light/

"110 µm high, 60 µm diameter optical device printed from organic photosensitive polymers on end of optical fibre... generated Gaussian–Bessel beam with initial width of 10 expanded to 30 µm along 2 mm distance... Gaussian beam with identical initial width will reach a width of 270 µm over the same distance, demonstrating that the beam is a diffracting-free beam... orbital angular momentum value of 1 ħ per photon, as expected. The incoming laser beam had no orbital angular momentum"