Is it possible to create a perfect fractional vortex beam?

Georgiy Tkachenko, Mingzhou Chen, Kishan Dholakia, Michael Mazilu

Research output: Contribution to journalLetterpeer-review

56 Citations (Scopus)


Laguerre-Gaussian beams of integer azimuthal index satisfy the fundamental principle of quantization of orbital angular momentum. Here, we consider light-induced orbiting of a trapped microparticle as a probe of the local orbital angular momentum density in both integer- and fractional-index perfect vortex beams. Simulations suggest that the distribution and the corresponding light-induced motion of the particle may be uniform in beams with integer azimuthal index, but fundamentally this cannot be achieved in beams with fractional index. We experimentally verify these predictions by light-induced trapping and rotation of individual microparticles in fractional index beams where we distribute the phase dislocations around the annular profile.

Original languageEnglish
Pages (from-to)330-333
Number of pages4
Issue number3
Publication statusPublished - 2017 Mar 20

Bibliographical note

Publisher Copyright:
© 2017 Optical Society of America.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


Dive into the research topics of 'Is it possible to create a perfect fractional vortex beam?'. Together they form a unique fingerprint.

Cite this