Abstract

Recently, we showed experimentally that light carrying orbital angular momentum experiences a slight subluminality under free-space propagation. We thank Saari [Optica 4, 204 (2017) [CrossRef]  ] for pointing out an apparent discrepancy between our theoretical results and the well-known results for the simple case of Laguerre–Gauss modes. In this reply, we note that the resolution of this apparent discrepancy is the distinction between Laguerre–Gauss modes and Hypergeometric-Gauss modes, which were used in our experiment and in our theoretical analysis, which gives rise to different subluminal effects.

© 2017 Optical Society of America

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References

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  1. F. Bouchard, J. Harris, H. Mand, R. W. Boyd, and E. Karimi, Optica 3, 351 (2016).
    [Crossref]
  2. P. Saari, Optica 4, 204 (2017).
    [Crossref]
  3. E. Bolduc, N. Bent, E. Santamato, E. Karimi, and R. W. Boyd, Opt. Lett. 38, 3546 (2013).
    [Crossref]
  4. E. Karimi, G. Zito, B. Piccirillo, L. Marrucci, and E. Santamato, Opt. Lett. 32, 3053 (2007).
    [Crossref]
  5. M. J. Padgett, F. M. Miatto, M. P. J. Lavery, A. Zeilinger, and R. W. Boyd, New J. Phys. 17, 023011 (2015).
    [Crossref]

2017 (1)

2016 (1)

2015 (1)

M. J. Padgett, F. M. Miatto, M. P. J. Lavery, A. Zeilinger, and R. W. Boyd, New J. Phys. 17, 023011 (2015).
[Crossref]

2013 (1)

2007 (1)

Bent, N.

Bolduc, E.

Bouchard, F.

Boyd, R. W.

Harris, J.

Karimi, E.

Lavery, M. P. J.

M. J. Padgett, F. M. Miatto, M. P. J. Lavery, A. Zeilinger, and R. W. Boyd, New J. Phys. 17, 023011 (2015).
[Crossref]

Mand, H.

Marrucci, L.

Miatto, F. M.

M. J. Padgett, F. M. Miatto, M. P. J. Lavery, A. Zeilinger, and R. W. Boyd, New J. Phys. 17, 023011 (2015).
[Crossref]

Padgett, M. J.

M. J. Padgett, F. M. Miatto, M. P. J. Lavery, A. Zeilinger, and R. W. Boyd, New J. Phys. 17, 023011 (2015).
[Crossref]

Piccirillo, B.

Saari, P.

Santamato, E.

Zeilinger, A.

M. J. Padgett, F. M. Miatto, M. P. J. Lavery, A. Zeilinger, and R. W. Boyd, New J. Phys. 17, 023011 (2015).
[Crossref]

Zito, G.

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Figures (1)

Fig. 1.
Fig. 1.

Group velocity for a twisted beam of = 5 and p = 0 as a function of the longitudinal and radial coordinate, i.e., z and r . A subluminal behavior is observed near the focus and for larger radial position. The blue and cyan crosses correspond to the radial position considered in Refs. [1,2], respectively. A slight superluminal contribution to the group velocity is observed near the focus for smaller radial positions.

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