Abstract
A terahertz (THz) spiral phase plate with high transmission (>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.
Highlights
Direct observation of the topological charge of a terahertz vortex beam generated by a Tsurupica spiral phase plate
Direct observations of the topological charge of a THz vortex beam are performed by using a THz camera with tilted lens focusing and radial defect introduction
Optical vortices having an annular intensity profile, a spiral wavefront, and orbital angular momentum characterized by an integer, m, provide diverse research opportunities.[1,2]
Summary
Direct observation of the topological charge of a terahertz vortex beam generated by a Tsurupica spiral phase plate. 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.
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