Versatile polarization multiplexing and phase modulation using a compact metasurface.

This paper presents a multifunctional reflective polarization converter based on a metasurface, tailored for efficient and versatile polarization and phase manipulation in the terahertz frequency range. The proposed design excels in polarization multiplexing by integrating multiple conversion functions across two frequency bands It achieves precise deflection for linearly polarized waves and efficient mutual conversion between right-handed and left-handed circularly polarized waves in the 1.13-1.97 THz range, and high-performance mutual conversion between linearly polarized and circularly polarized waves from 2.03 to 2.97 THz. The metasurface enables distinct polarization conversion effects across multiple frequency bands, showcasing exceptional multiplexing capabilities. Additionally, it exhibits P-B phase manipulation properties, achieving consistent and uniform phase modulation over the entire operational bandwidth. As a result, the metasurface demonstrates outstanding beam focusing performance and efficient generation of OAM beams across a wide frequency range. These combined functionalities, supported by comprehensive numerical simulations, underscore the metasurface's significant potential for advanced multiplexing applications in electronic countermeasures, satellite communications, and next-generation wireless systems.