Polarization Multiplexing Hologram Realized by Anisotropic Digital Metasurface

Metasurface holograms have the potential to be applied in a variety of practical fields. Here an anisotropic digital metasurface is proposed that can project polarization multiplexing patterns at the microwave frequency, in which a modified Gerchberg-Saxton algorithm is presented to calculate the phase masks. A 3-bit coding metamaterial unit is also proposed, which is capable of independently manipulating the transmission phases of orthogonal linearly polarized electromagnetic waves. The influence of wave-front has been analyzed by comparing two holographic results with distinct source optimization methods. A prototype of the anisotropic digital coding metasurface optimized with horn wave-front is designed, manufactured, and tested. The experimental measurements present the expected holographic fields and have a good match with the simulation results.

Automated summary

The article introduces an anisotropic digital metasurface technology that can project polarization multiplexing patterns at microwave frequencies, along with a modified calculation algorithm and coding metamaterial unit. By comparing experimental measurements with simulation results, the effectiveness of the designed metasurface is validated.