Direct observation of the topological charge of a terahertz vortex beam generated by a Tsurupica spiral phase plate

  • K. Miyamoto
    Chiba University 1 Graduate School of Advanced Integration Science, , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
  • K. Suizu
    Chiba Institute of Technology 2 Department of Electrical, Electronics and Computer Engineering, , 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
  • T. Akiba
    Chiba Institute of Technology 2 Department of Electrical, Electronics and Computer Engineering, , 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan
  • T. Omatsu
    Chiba University 1 Graduate School of Advanced Integration Science, , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan

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<jats:p>A terahertz (THz) spiral phase plate with high transmission (&gt;90% after Fresnel correction) and low dispersion has been developed based on the Tsurupica olefin polymer. Direct observations of the topological charge (both magnitude and sign) of a THz vortex beam are performed by using a THz camera with tilted lens focusing and radial defect introduction. The vortex outputs with a topological charge of ±1 (or ±2) are obtained at a frequency of 2 (or 4) THz.</jats:p>

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