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We would like to clarify our paper [Opt. Express 25, 377 (2017)] abstract sentence “These beams carry orbital angular momentum proportional to the number of intertwined helices constituting the wavefront.”
© 2017 Optical Society of America
1. Introduction
In general the number of vortices in a beam and the orbital angular momentum of the beam are not directly related. In fact, the orbital angular momentum is not associated, in general, with the wave dislocations. This is well described for instance in reference [2].
2. Acknowledgments
We thank Prof. Michael Berry for his comments about our work.
References and links
1. R. C. Devlin, A. Ambrosio, D. Wintz, S. L. Oscurato, A. Y. Zhu, M. Khorasaninejad, J. Oh, P. Maddalena, and F. Capasso, “Spin-to-orbital angular momentum conversion in dielectric metasurfaces,” Opt. Express 25(1), 377-393 (2017).
2. M. V. Berry, “Paraxial beams of spinning light,” in Proc. SPIE Conf. Singular Optics 3487, M. S. Soskin ed. (SPIE, 1998), pp. 6–11.