Current Applied Physics

Korean Physical Society (한국물리학회)
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Acousto-optic generation of orbital angular momentum states of light in a tapered optical fiber

  • Song, Changkeun (Department of Physics, Korea Advanced Institute of Science and Technology) ;
  • Park, Hee Su (Korea Research Institute of Standards and Science) ;
  • Song, Kwang Yong (Department of Physics, Chung-Ang University) ;
  • Kim, Byoung Yoon (Department of Physics, Korea Advanced Institute of Science and Technology)
  • Received : 2018.06.02
  • Accepted : 2018.08.28
  • Published : 2018.11.30
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Abstract

We demonstrate an acousto-optic mode converter based on a tapered optical fiber to efficiently generate orbital angular momentum states of light. In our scheme an acoustic wave is deployed to the waist of tapered optical fiber where two degenerate $HE_{21}$ modes leading to +1 and -1 orbital angular momentum eigen-modes are resonantly excited. The excitation of $TM_{01}$ and $TE_{01}$ modes is suppressed by enlarging the intermodal index difference between near-degenerate spatial modes. Numerical calculation for optimization of the taper diameter is provided. The experimental characterization of generated states is performed by analyzing the output far-field pattern and the spatial interference fringes with a uniform reference beam.

Keywords

References

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