Bidirectional Asymmetric Transmission Metasurfaces for Multi-Mode Imaging

This study presents a millimeter-wave multimode imaging system incorporating metasurfaces with bidirectional asymmetric transmission characteristics, demonstrating distinct focusing responses under forward and backward propagation modes. The proposed architecture achieves enhanced multi-channel multiplexing capabilities, establishing a novel paradigm for functional expansion in electromagnetic imaging systems. Experimental results verify that the system enables simultaneous multi-target imaging through spatial wavefront encoding while improving detection range and resolution. This innovative electromagnetic manipulation strategy provides both the theoretical framework and practical implementation guidelines for designing highly integrated imaging systems with advanced wavefront engineering capabilities.