Swarm of photons can somersault in lockstep

Scientists demonstrate the surprising result that photons in vacuum can have orbital angular momentum (OAM) vectors pointing sideways, at 90 degrees to the direction of propagation - a result literally orthogonal to the decades-long expectation that OAM vectors could only point forward or backward.

from Top Technology News -- ScienceDaily https://ift.tt/3nTFNwy