Broadband terahertz wavefront modulation based on flexible metasurface

To broaden the range of working frequency of the metasurface in the THz band, a flexible metasurface based on the parylene-C film was proposed. The metasurface is composed of elliptical split-ring units with different opening gaps. Elliptical split-ring units with different arrangement can work as 2D beam deflector, 3D beam deflector or vortex generator. The 2D beam deflector modulate THz waves with deflection angles (38 degrees-13.5 degrees) in the broad frequencies (0.6-1.6 THz), whereas the 3D beam deflector can realize beam deflection in 3D space, and the vortex beam generator can modulate THz wave as stable vortex beams carrying orbital angular momentum (OAM) in the broad frequencies (0.8-1.4 THz). The simulation results illustrate that the proposed flexible metasurface exhibits broadband effect in THz range, which promotes the application of flexible metasurfaces in the fields of THz optical field modulation and THz communication.

Automated summary

A flexible metasurface based on parylene-C film was proposed in this study, featuring elliptical split-ring units that can function as 2D beam deflectors, 3D beam deflectors, or vortex generators in the THz band. The metasurface demonstrates broadband effects and enables modulation of THz waves for various applications in THz optical field modulation and communication.