Type

Journal Article

Authors

Yury Rakovich
John Donegan
James Lunney
Paul Eastham

Subjects

Physics

Topics
first order gaussian light beam optics nanoscience materials tuneable diffraction optical orbital angular momentum generation

Generation of continuously tuneable fractional optical orbital angular momentum using internal conical diffraction (2010)

Abstract Abstract: When a left-circularly polarised Gaussian light beam, which has spin angular momentum (SAM) Jsp = ?? = 1? per photon, is incident along one of the optic axes of a slab of biaxial crystal it undergoes internal conical diffraction and propagates as a hollow cone of light in the crystal. The emergent beam is a superposition of equal amplitude zero and first order Bessel like beams. The zero order beam is left-circularly polarised with zero orbital angular momentum (OAM) Jorb = ?? = 0, while the first order beam is right-circularly polarized but carries OAM of Jorb = 1? per photon. Thus, taken together the two beams have zero SAM and Jorb = ?? per photon. In this paper we examine internal conical diffraction of an elliptically polarised beam, which has fractional SAM, and demonstrate an all-optical process for the generation light beams with fractional OAM up to ? 1?
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Full list of authors on original publication

Yury Rakovich, John Donegan, James Lunney, Paul Eastham

Experts in our system

1
John Francis Donegan
Trinity College Dublin
Total Publications: 152
 
2
James Gerard Lunney
Trinity College Dublin
Total Publications: 55
 
3
Paul Eastham
Trinity College Dublin
Total Publications: 44