超表面对垂直入射s、p偏振的操控

Metasurface Manipulation of Vertical Incidence s and p Polarization

摘要: 相比于超材料，二维结构的超表面不仅是体积的压缩，更多的是操控电磁波的相位、振幅和偏振等波前信息。尤其是相位梯度超表面(Gradient Metasurface, GMS)的出现使得超表面对电磁波的操控达到了一个新的高度。本文基于金属级联单元和广义Snell定律，设计出三种#字形金属结构单元。在CST仿真中，中心频率为10 GHz，使用Frequency domain模式进行仿真，边界条件采用的是unit cell边界条件。本文用三种方式实现了当电磁波垂直入射到超表面上时，达到s、p偏振分离的效果：(1) 在s、p偏振保持高透射的情况下，根据s、p偏振的透射相位设计了四分之一波片和二分之一波片，进行参数扫描，在满足对p偏振的相位全覆盖的同时不影响s偏振，实现了p偏振的波束偏转；(2) p偏振反射、s偏振透射：(3) p偏振透射、s偏振反射。

Abstract: Compared with metamaterials, the two-dimensional structure of the metasurface not only compresses the volume, but also controls the phase, amplitude and polarization of the wave front information of the electromagnetic wave. Especially, the appearance of phase gradient metasurface (Gradient Metasurface, GMS) has led to a new trend in the manipulation of electromagnetic waves by metasurface. In CST simulation, the center Frequency is 10 GHz, the Frequency domain mode is used for simulation, and the boundary condition is unit cell boundary condition. In this paper, three ways are used to achieve the effect of polarization separation of s and p when the electromagnetic wave is vertically incident on the metasurface: (1) Under the condition that s and p polarization maintain high transmission, a quarter wave plate and a half wave plate are designed according to the transmission phase of s and p polarization, and the parameter scanning is carried out to meet the full phase coverage of p polarization without affecting s polarization, and the beam deflection of p polarization is realized; (2) p polarization reflection, s polarization transmission; (3) p polarization transmission, s polarization reflection.