Recently, Professor Si Liming's research group at the School of Integrated Circuits and Electronics, Beijing Institute of Technology (BIT), has made progress in the field of crosstalk-free spin-selective metasurface technology applications. The research group proposed a new type of highly efficient crosstalk-free spin-selective metasurface, which can achieve nearly 100 percent efficiency in full-space electromagnetic wavefront control.

The achievement, titled Crosstalk-Free Spin-Selective Metasurface for Full-Space Wavefront Manipulation with Nearly 100% Efficiency, has been published in the internationally renowned journal Advanced Optical Materials.

Schematic diagram of high-efficiency full-space crosstalk-free spin-selective metasurface functionality

Spin-selective metasurface, as one of the core technologies for achieving multifunctional and high-precision electromagnetic wave control, has received widespread attention in recent years in the frontier fields such as intelligent communication, information processing, and new radar systems. However, current technical solutions generally face key bottlenecks such as low energy utilization efficiency and severe polarization crosstalk between channels, greatly limiting their practicality and system integration capabilities. To address this challenge, Professor Si Liming's research group has successfully designed and implemented a new high-efficiency full-space spin-selective metasurface operating in the X-band.

Experimental results demonstrate that the metasurface achieves nearly 100 percent ultra-high efficiency in full-space control capability, with a measured efficiency as high as 97 percent. The metasurface architecture is highly integrated and compact, enabling efficient reuse and demultiplexing of dual-channel vortex waves, showcasing full-space, crosstalk-free, high-efficiency electromagnetic wavefront control capabilities. It is poised to exhibit significant advantages in high-capacity communication systems and holds broad application prospects in frontier fields such as drones, autonomous driving, and electromagnetic spatial information transmission.

Paper details: Liming Si*, Qitao Shen, Ling Dong, Hang Zhang, Chenyang Dang, Xiu'e Bao, Weiren Zhu*, Crosstalk-free spin-selective metasurface for full-space wavefront manipulation with nearly 100% efficiency, Advanced Optical Materials, pp: 2501041, 2025.