Ultrathin dual-mode vortex beam generator based on anisotropic coding metasurface.

Area of Science:

• Electromagnetics and Metamaterials
• Applied Physics
• Microwave Engineering

Background:

• Metasurfaces offer advanced control over electromagnetic waves.
• Generating dual-mode vortex beams with independent polarization control is challenging.
• Existing designs often involve complex structures and fabrication processes.

Purpose of the Study:

• To propose and demonstrate an ultrathin anisotropic coding metasurface for dual-mode vortex beam generation.
• To achieve independent manipulation of orthogonally linearly polarized waves.
• To simplify the design process for vortex beam generators.

Main Methods:

• Design of an ultrathin single-layer ground-backed Jerusalem cross structure.
• Independent control of orthogonally linearly polarized incident waves.
• Design and simulation of a metasurface operating at 15 GHz for specific topological charges.

Main Results:

• Demonstration of a dual-mode vortex beam generator with independent polarization control.
• Experimental validation of the designed metasurface prototype.
• High-quality vortex beams with different topological charges generated under orthogonal polarizations.

Conclusions:

• The proposed anisotropic coding metasurface enables efficient dual-mode vortex beam generation.
• The simplified design offers practical advantages for fabricating complex electromagnetic devices.
• Potential applications in advanced microwave wireless communication systems.