By considering the transverse spin angular momentum (SAM) that results from the rotation of the electric-field component of a surface mode as a longitudinal SAM of an elliptically polarized light propagating through a homogeneous medium, an alternate route to deriving the formula of the Abraham SAM carried by the surface mode can be achieved. The findings prove in an explicit manner that it is the Abraham SAM that is directly related to the rotation of the electric field.
© 2014 Optical Society of America
Optics at Surfaces
Original Manuscript: December 3, 2013
Revised Manuscript: December 22, 2013
Manuscript Accepted: December 23, 2013
Published: January 30, 2014
Kyoung-Youm Kim, "Origin of the Abraham spin angular momentum of surface modes," Opt. Lett. 39, 682-684 (2014)