Within the framework of the Huygens–Fresnel approach, we evaluate the coherent superposition of surface plasmon (SP) modes excited by an incident circularly polarized light propagating through an array of subwavelength holes. Numerical results of the plasmonic distribution exhibit a rich structure that reveals the creation and annihilation of vortex arrays in the field phase. These phase singularities stem from total transfer of the spin angular momentum (AM) of the incident radiation to the orbital AM of the SP.
© 2013 Optical Society of America
Original Manuscript: September 28, 2012
Revised Manuscript: January 30, 2013
Manuscript Accepted: February 5, 2013
Published: March 13, 2013
P. A. Brandão and S. B. Cavalcanti, "Optical spin-to-orbital plasmonic angular momentum conversion in subwavelength apertures," Opt. Lett. 38, 920-922 (2013)