Li FengXia, Chen HaiYan, Yin XiaoHan, Yin Jia-Yuan, Deng Jing-Ya
Opt Express. 2025 Mar 24;33(6):13332-13342. doi: 10.1364/OE.551353.
With the growing scarcity of spectrum resources and the exponential rise in information transmission demand, improving channel capacity and spectrum utilization remains a significant challenge that has attracted considerable attention. The independent and free control of multi-polarization channels of wavefront has brought a promising solution to address this problem. This paper proposes what we believe is a novel approach that combines the propagation phase and PB phase to break the limitations of spin-locking and realize independent control of linearly and circularly polarized vortex beams for each distinct polarization channel. The partition design of spin-decoupled single-layer metasurface, which is proposed based on polarization conversion units by tailoring cross-polarized components, enables complete control of full polarization multichannel wavefronts. This approach has the potential to considerably reduce the design complexity while ensuring simultaneous and independent modulation of the topological charges, beam deflection angles (the angles deviating from =0°, =0°), and linearly and circularly polarizations of multichannel wavefronts, which is beneficial for increasing the information capability and improving communication efficiency. The theoretical design was verified through experimentation. This method can be applied to multichannel wavefronts control, polarization multiplexing and super-resolution imaging in microwave and optical systems.
随着频谱资源日益稀缺以及信息传输需求呈指数级增长，提高信道容量和频谱利用率仍然是一个重大挑战，备受关注。对波前多极化信道的独立自由控制为解决这一问题带来了一个有前景的解决方案。本文提出了一种我们认为新颖的方法，该方法结合传播相位和PB相位，突破自旋锁定的限制，实现对每个不同极化信道的线性和圆极化涡旋光束的独立控制。基于极化转换单元通过裁剪交叉极化分量提出的自旋解耦单层超表面的分区设计，能够完全控制全极化多通道波前。这种方法有可能显著降低设计复杂度，同时确保对多通道波前的拓扑电荷、光束偏转角（偏离 =0°， =0°的角度）以及线性和圆极化进行同时且独立的调制，这有利于提高信息容量和通信效率。通过实验验证了理论设计。该方法可应用于微波和光学系统中的多通道波前控制、极化复用和超分辨率成像。
