High‐Efficiency and Full‐Space Indoor Holographic Communication System Assisted by Complex‐Amplitude Metasurface

Abstract As there is a diversification in indoor communication scenarios, metasurfaces with complex‐amplitude modulation show great potential for improving communication performances. However, metasurfaces still face challenges in achieving efficient full‐space coverage, multi‐channel communication, and system integration. Here, a frequency‐spatial multiplexed complex‐amplitude metasurface design strategy is proposed for indoor communications. By adjusting the structural parameters and orientation angles of the meta‐atoms, the amplitude and phase across full‐space five channels are jointly tailored, enabling precise wave manipulation to enhance the communication quality within the coverage area. Additionally, the designed metasurface is utilized in an indoor communication system to generate different holographic images at specific frequencies and distances, allowing point‐to‐point communication terminals to receive the holographic signals and perform specific functions. Meanwhile, the ultrathin structure with a single‐layer substrate cladded by two patterned metal layers facilitates high‐density integration within indoor devices. Numerical simulations and experimental results validate the full‐space five‐channel holographic imaging, demonstrating its potential for wide‐area wireless communication and efficient data transmission applications, and providing new directions for future communication technologies.