In analogy with the separation of the total optical angular momentum into a spin and an orbital part in electrodynamics, we introduce a new concept of spin and orbital angular coherence momenta into the general coherence theory of vector electromagnetic fields. The properties of the newly introduced spin and orbital angular coherence momenta are investigated through the decomposition of the total coherence angular momentum into the sum of these two components, and their separate conservations have been derived for what is believed to be the first time.
© 2007 Optical Society of America
Coherence and Statistical Optics
Original Manuscript: April 26, 2007
Revised Manuscript: August 2, 2007
Manuscript Accepted: August 7, 2007
Published: September 4, 2007
Wei Wang and Mitsuo Takeda, "Separation of spin and orbital angular coherence momenta in the second-order coherence theory of vector electromagnetic fields," Opt. Lett. 32, 2656-2658 (2007)