3 ms·

See also http://physics.aps.org/story/v17/st15 http://physics.aps.org/story/v17/st15 for a bit more on photon orbital angular momentum.

• jcarreiro 15y ago
  And http://physics.aps.org/story/v9/st29 http://physics.aps.org/story/v9/st29, which is an older Focus story linked to from my original post.
• Gravityloss 15y ago
  That's the first explanation that makes sense so far!
• Gravityloss 15y ago
  That's the first explanation that makes sense so far!