Abstract

Optical vortices with a helical wavefront due to a phase singularity, and circularly polarized light with a helical electric field have an orbital angular momentum () and a spin angular momentum (), respectively. Consequently, a circularly polarized optical vortex will carry the total angular momentum (=+), defined by the vector sum of the orbital and spin angular momenta. In recent years, we and our-coworkers discovered an interesting phenomenon, in which the angular momentum of the optical vortex is transferred to an irradiated metal target through an ablation process, providing twisted nanoneedles [1,2].

© 2013 IEEE

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