Terahertz OAM-Airy beam generator

Vortex beams carrying orbital angular momentum (OAM) can significantly enhance spectral efficiency and anti-interference capabilities, demonstrating promising applications in future 6G high-capacity wireless communications. However, scattering during OAM beam propagation reduces transmission efficiency. Airy beams offer advantageous properties, including non-diffraction, self-focusing, and self-healing characteristics during propagation. By combining these features of Airy beams with OAM beams, scattering issues in electromagnetic wave transmission can be effectively mitigated. In this article, we employ the OAM-Airy phase superposition principle to design a five-layer transmissive metasurface operating at 1 THz with dimensions of 10λ ₀ ×10λ ₀ , enabling simulation verification of terahertz non-diffracting OAM-Airy beams. Simulation results confirm successful generation of OAM-Airy beams with topological charge l = 1 across the 0.8-1.3 THz frequency band, achieving non-diffracting propagation distances exceeding 6300 µm (21λ ₀ ). The OAM-Airy beam achieves focus at 4200 µm (14.3λ ₀ ).