Vectorial Properties of a Terahertz Bessel Beam

As a kind of special beams, Bessel beams are always a research hot spot in optics due to its non-diffractive and self-healing properties. Here, a zero-order terahertz (THz) Bessel beam is generated by using a Teflon axicon. By applying a THz focal-plane imaging system, the evolutions of the transverse and longitudinal electric fields are coherently measured and analyzed during the propagation process of the THz Bessel beam. The work provides a comprehensive view for exactly understanding peculiar features of a THz Bessel beam.