Metasurface holograms have the potential to be applied in a variety of practical fields. Here an anisotropic digital metasurface is proposed that can project polarization multiplexing patterns at the microwave frequency, in which a modified Gerchberg–Saxton algorithm is presented to calculate the phase masks. A 3-bit coding metamaterial unit is also proposed, which is capable of independently manipulating the transmission phases of orthogonal linearly polarized electromagnetic waves. The influence of wave-front has been analyzed by comparing two holographic results with distinct source optimization methods. A prototype of the anisotropic digital coding metasurface optimized with horn wave-front is designed, manufactured, and tested. The experimental measurements present the expected holographic fields and have a good match with the simulation results.

中文翻译：

---

各向异性数字超表面实现的偏振复用全息图

超表面全息图具有应用于各种实际领域的潜力。这里提出了一种各向异性数字超表面，可以在微波频率下投射偏振复用模式，其中提出了一种改进的 Gerchberg-Saxton 算法来计算相位掩模。还提出了一种 3 位编码超材料单元，它能够独立操纵正交线极化电磁波的传输相位。通过比较两种全息结果与不同的源优化方法，分析了波前的影响。设计、制造和测试了用喇叭波前优化的各向异性数字编码超表面的原型。