light orbital angular momentum (again!)

Hi,

There's a new article about detecting light's orbital angular momentum,
this time from Harvard, is this just a terminonly confusion with the
light polarization or is it actually OAM? They use nano-etched gold
holograms to act as a plasmonic resonator to distinguish light with OAM
of -1,0,+1

cheers,
Jamie

 

I guess a link to the article would help. Optical angular momentum
seems to be a bit of a research 'fad' these days.
At the last March APS meeting everyone was talking about topological
insulators.
(Not that that's has any relation to OAM... just another fad.)

George H.

 

Oops here is the link!!

http://phys.org/news/2013-01-device-contribute-major-future-optical.html

cheers,
Jamie