Direct measurement of the skew angle of the Poynting vector in a helically phased beam.
We measure the local skew angle of the Poynting vector within a helically-phased, exp (il phi), beam using a Shack Hartmann wavefront sensor. It is the skew angle of the Poynting vector with respect to the beam axis that gives rise to the orbital angular momentum of a light beam. We confirm that this skew angle is l/kr, corresponding to an orbital angular momentum of l? per photon. Measurement of orbital angular momentum in this way is an alternative to interferometric techniques giving a non-ambiguous result to both the magnitude and sign of l from a single measurement, without any restriction on the optical bandwidth.
Leach
Jonathan
J
Keen
Stephen
S
Padgett
Miles J
MJ
Saunter
Christopher
C
Love
Gordon D
GD