Newly Discovered Optical Vortex Was Never Noticed Before

Ok, that is pretty cool, the paper is here: <a href="http:&#x2F;&#x2F;journals.aps.org&#x2F;prx&#x2F;pdf&#x2F;10.1103&#x2F;PhysRevX.6.031037" rel="nofollow">http:&#x2F;&#x2F;journals.aps.org&#x2F;prx&#x2F;pdf&#x2F;10.1103&#x2F;PhysRevX.6.031037</a><p>I&#x27;m still trying to get my head around the idea of a wave propagating in such a way that it imparts an angular momentum on things.

If the main light pulse is traveling at the speed of light and the vortex travels with it, that implies that the vortex must have one edge traveling at 2x the speed of light... but that&#x27;s not possible. How does this reconcile with relativity?

Additional coverage here: <a href="http:&#x2F;&#x2F;www.sciencealert.com&#x2F;scientists-have-discovered-new-smoke-rings-made-of-laser-light" rel="nofollow">http:&#x2F;&#x2F;www.sciencealert.com&#x2F;scientists-have-discovered-new-s...</a>

Just saw world&#x27;s largest air cannon few days ago<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=GHiTDsFTFQQ" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=GHiTDsFTFQQ</a><p>so basically, STOVs are like this but of photons?

I think the most intuitive explanation from the article was the analogy of a laser beam blowing smoke rings with light.

This was found in a simulation. How would one detect this experimentally and confirm the phenomenon?