Abstract
A silicon spiral phase plate (SPP) was proposed for a pulsed terahertz signal to produce orbital angular momentum with a topological charge of $l=1$. The resulting field distribution after the signal passes through the SPP was simulated using finite-difference time-domain method and observed at different propagation distances. It shows that the helical spatial structure and optical vortex were best observed at the farthest distance of 7.5 cm. Additionally, the cross-section field distribution at different times as the signal passes through the SPP indicates a helical wavefront structure. Moreover, the output of a source with different central frequencies was observed when using the same SPP and showed a hollow distribution indicating a vortex despite not being located in the center.
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