Propagation Analysis of Terahertz OAM Waves in Atmospheric Turbulent Environment

The orbital angular momentum (OAM) wireless communication technology is widely studied in recent literature, and the propagation characteristics in the atmosphere turbulent environment have attracted the attention of scholars. OAM can be affected by atmosphere turbulence during space transmission, causing energy diffusion and phase profile distortion, which makes it difficult to analyze the information at the receiving end. Radio waves in different frequency bands have various performance when transmitting in space. This paper study the propagation of OAM waves in terahertz frequency bands. Power spectrum inversion method is employed to simulate phase distortion caused by atmosphere turbulence. A full study of distortions on vortex beam intensity and phase profiles in air environment is given along with OAM mode spectrum analysis in the visible and terahertz bands in atmosphere turbulence. Results suggest terahertz OAM waves can resist more air turbulence than visible-light OAM beams which have great potential in air/space communications.