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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 13 — Jul. 1, 2014
  • pp: 3714–3717

Generation of broadband terahertz vortex beams

Ryo Imai, Natsuki Kanda, Takuya Higuchi, Kuniaki Konishi, and Makoto Kuwata-Gonokami  »View Author Affiliations

Optics Letters, Vol. 39, Issue 13, pp. 3714-3717 (2014)

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We propose and demonstrate a method for generating broadband terahertz (THz) vortex beams. We convert a THz radially polarized beam into a THz vortex beam via achromatic polarization optical elements for THz waves and characterize the topological charge of the generated vortex beam by measuring the spatial distribution of the phase of the THz wave at its focal plane. For example, a uniform topological charge of +1 is achieved over a wide frequency range. We also demonstrate that the sign of the topological charge can be easily controlled. By utilizing the orbital angular momentum of the beam, these results open new THz wave technologies for sensing, manipulation, and telecommunication.

© 2014 Optical Society of America

OCIS Codes
(080.4865) Geometric optics : Optical vortices
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:

Original Manuscript: April 21, 2014
Manuscript Accepted: April 28, 2014
Published: June 17, 2014

Ryo Imai, Natsuki Kanda, Takuya Higuchi, Kuniaki Konishi, and Makoto Kuwata-Gonokami, "Generation of broadband terahertz vortex beams," Opt. Lett. 39, 3714-3717 (2014)

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