Multideflection Angle Quasi-Nondiffractive Beams Generating Metasurface Based on Polarization Multiplexing Technology

Abstract

Polarization multiplexing technology holds significant potential for applications in the next generation of microwave wireless information encryption and storage systems. However, nonorthogonal linear polarization multiplexing often results in high crosstalk between different channels. Moreover, the multidegree-of-freedom control of the Jones matrix on a single meta-atom structure is very complex. In this article, a new supercell is designed by combining the polarization response characteristics of four independent meta-atoms, resulting in a subwavelength structure ( $0.64\lambda $ ) that precisely satisfies the target Jones matrix requirements, with nearly 360° phase coverage from a single meta-atom. In addition, artificially designed noncorrelated noise is introduced to eliminate crosstalk between different channels, ensuring that the correlation coefficients of the target channels do not deteriorate significantly. To verify the feasibility of this method, the functionality of the four channels is designed with quasi-nondiffractive beams with different deflection angles, and the performance of the proposed polarization multiplexing metasurface is analyzed using simulations and experiments. The experimental results show that nearly 50% of the energy is distributed to the target areas, and the signal-to-noise ratio (SNR) of each channel also exhibits good performance close to 10. These results demonstrate the feasibility of using noncorrelated noise to improve crosstalk in polarization multiplexing techniques within the microwave frequency range and validate the effectiveness of using supercells for multidegree-of-freedom control of the Jones matrix in the microwave band.