Gu Wei, Shao Yan, Wen Haozhe, Yao Weiyu, Liang Wei, Wang Xinyi, Tang Hongying, Wang Liangxing, Luo Yang
Opt Express. 2025 Jan 27;33(2):2712-2727. doi: 10.1364/OE.547382.
This paper proposes a reflective metasurface composed of a single unit structure, yet capable of achieving precise control of two degrees of freedom. By grooving two orthogonal slots on the copper ring, it enables the independent conversion of the two orthogonal components of the incident waves. Consequently, incident linearly-polarized waves can be rotated by an arbitrary angle. For circularly-polarized waves, the handedness will be reversed; furthermore, the phase of the reflected wave can cover the full 2π range by rotating the unit cells in a manner similar to that of the Pancharatnam-Berry (PB) phase metasurface. Rigorous theoretical analyses are provided. Numerical validation demonstrates that the cross-polarization reflectance of the metasurface exceeds 0.7 within the frequency range of 0.7044 to 2.0859 THz, corresponding to nearly 100% relative bandwidth. The modulation accuracy of the polarization angle can reach within 1 degree. The proposed metasurface may find applications in communication, imaging, sensing, and other fields.
本文提出了一种由单个单元结构组成的反射型超表面，它能够实现对两个自由度的精确控制。通过在铜环上开出两个相互正交的狭槽，它能够实现入射波两个正交分量的独立转换。因此，入射的线偏振波可以旋转任意角度。对于圆偏振波，其旋向将被反转；此外，通过以类似于潘查拉特纳姆 - 贝里（PB）相位超表面的方式旋转单元结构，反射波的相位可以覆盖完整的2π范围。文中提供了严格的理论分析。数值验证表明，该超表面在0.7044至2.0859太赫兹的频率范围内，交叉极化反射率超过0.7，对应近100%的相对带宽。偏振角的调制精度可达1度以内。所提出的超表面可能在通信、成像、传感等领域找到应用。
