Dual Structured Terahertz Beam Generators Based on All-Dielectric Metasurfaces

With properties of lower photon energy, higher imaging resolution compared with microwaves, and strong penetration into many dielectric materials, terahertz (THz) waves can find important applications in areas such as spectroscopy, imaging, communications, and non-destructive evaluation. Recently, structured beams with unique field distribution and non-diffractive transmission, particularly Bessel beams
¹
, have been used in THz spectroscopy and imaging, enhancing the performances of THz technology and promoting new advances.