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Design of dual-function metasurface based on beam polarization characteristics

机译：基于光束偏振特性的双功能元曲面设计

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摘要

In order to solve the problem of mono-working frequency and monofunction of traditional metasurface, a design approach for realizing dual-band dual-function metasurface based on beam polarization characteristics is proposed. Based on the principle of the dipole that it can only induce the parallel electric field while maintaining unsensitive to vertical electric field, a T shaped unit structure consist of two dipole is designed, which could realize the flexible control on reflecting phase and operating frequency independently. According to the generalized Snell's law and the spiral phase factor required to generate orbital angular momentum (OAM) electromagnetic waves, the two dipoles are respectively coded to construct 3-bit metasurfaces. Numerical simulation and measured results show that the metasurface designed according to the above method has beam deflection function at 18 GHz when the x-polarized wave is incident, and the vortex electromagnetic wave can be generated at 32 GHz when the y-polarized wave is incident, which proves the correctness and effectiveness of the proposed method. The proposed design method can be extended to the terahertz band or even the optical band. The metasurface designed according to this method has potential application value in multiple input multiple output (MIMO) communication systems.
机译：为了解决单一工作频率的问题和传统元表面的单功能，提出了一种基于光束偏振特性实现双带双功能元表面的设计方法。基于偶极子的原理，它只能诱导平行电场，同时保持对垂直电场的不敏感，设计了由两个偶极子组成的T形单元结构，其可以实现对反射相位和独立工作频率的灵活控制。根据广义的Snell的定律和产生轨道角动量（OAM）电磁波所需的螺旋相因子，两个偶极子分别编码以构建3位元核。数值模拟和测量结果表明，当X偏振波入射时，根据上述方法设计的元表面具有18 GHz的光束偏转功能，并且当Y偏振波发生时，可以在32 GHz处产生涡旋电磁波，证明了该方法的正确性和有效性。所提出的设计方法可以扩展到太赫兹带甚至光带。根据该方法设计的元表面具有多输入多输出（MIMO）通信系统的潜在应用值。

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