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Direct observation of the transfer of orbital angular momentum to metal particles from a focused circularly polarized Gaussian beam

Direct observation of the transfer of orbital angular momentum to metal particles from a focused circularly polarized Gaussian beam

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Authors

  • Yiqiong Zhao
  • David Shapiro
  • David Mcgloin
  • Daniel T. Chiu
  • Stefano Marchesini

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Info

Original languageEnglish
Pages23316-23322
Number of pages7
JournalOptics Express
Journal publication date7 Dec 2009
Journal number25
Volume17
DOIs
StatePublished

Abstract

It is well known that a circularly polarized Gaussian beam carries spin angular momentum, but not orbital angular momentum. This paper demonstrates that focusing a beam carrying spin angular momentum can induce an orbital angular momentum which we used to drive the orbital motion of a micron-sized metal particle that is trapped off the beam axis. The direction of the orbital motion is controlled by the handedness of the circular polarization. The orbiting dynamics of the trapped particle, which acted as an optical micro-detector, were quantitatively measured and found to be in excellent agreement with the theoretical predictions. (C) 2009 Optical Society of America

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