Comments on "Near-field interference for the unidirectional excitation of electromagnetic guided modes"

Abstract: Rodriguez-Fortuno et al. (19 April 2013, p. 330) reported the unidirectional excitation of electromagnetic guided modes via the oblique illumination of a circularly polarized light. This comment points out that the same scheme was addressed in our a-year-ahead paper and that magnetic dipoles play a key role in the unidirectional excitation which was neglected in Rodriguez-Fortuno et al.'s report.