Abstract
Using a simple three-dimensional printed element, i.e., ridge prism, we generate a new diffraction-free structured terahertz (THz) beam: THz sheet in free space. Numerical and experimental results show that the output beam from such an element has an one-dimensional invariant transverse profile. Note that the THz sheet generated by a ridge prism is always close to the element, which limits its application. Thus, we design a lens group system to deliver the THz sheet to a distance, as well as increase the diffraction-free length of the THz sheet six times. Finally, we experimentally demonstrate that this structured beam can be used to extend the depth of fields of a THz transmission imaging system.
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