Abstract

Perfect (optical) vortices (PVs) have the mooted ability to encode orbital angular momentum (OAM) onto the field within a well-defined annular ring. Although this makes the near-field radial profile independent of OAM, the far-field radial profile nevertheless scales with OAM, forming a Bessel structure. As yet, the quantitative measurement of the OAM of PVs has been elusive, with current detection protocols opting for more qualitative procedures using interference or mode sorters. Here, we show that the OAM content of a PV can be measured quantitatively using optical modal decomposition: an already widely utilized technique for decomposing an arbitrary light field into a set of basis functions. We outline the theory and confirm it by experiment with holograms written to spatial light modulators, highlighting the care required for accurate decomposition of the OAM content. Our work will be of interest to the large community who seek to use such structured light fields in various applications, including optical trapping and tweezing, and optical communications.

© 2019 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Quantitative measurement of the orbital angular momentum density of light

Angela Dudley, Igor A. Litvin, and Andrew Forbes
Appl. Opt. 51(7) 823-833 (2012)

Tuning the orbital angular momentum in optical vortex beams

Christian H. J. Schmitz, Kai Uhrig, Joachim P. Spatz, and Jennifer E. Curtis
Opt. Express 14(15) 6604-6612 (2006)

Light beams with fractional orbital angular momentum and their vortex structure

Jörg B. Götte, Kevin O’Holleran, Daryl Preece, Florian Flossmann, Sonja Franke-Arnold, Stephen M. Barnett, and Miles J. Padgett
Opt. Express 16(2) 993-1006 (2008)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (3)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (8)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription