Polarization is one of the basic characteristics of electromagnetic (EM) waves, and its flexible control is very important in many practical applications. At present, most of the multifunction polarization metasurfaces are electrically tunable based on PIN and varactor diodes, which are easy to operate and have strong real-time performance. However, there are still some problems in them, such as few degrees of freedom of planar structure control, complex circuit, bulky sample, and high cost. In view of these shortcomings, this paper proposes a Miura origami based reconfigurable polarization conversion metasurface for multifunctional control of EM waves. The interaction between the electric dipoles is changed by adjusting the folding angle θ$\theta$, thereby tuning the operating frequency of the polarization conversion and the polarization state of the reflected wave. This mechanical control method brings more degrees of freedom to manipulate EM waves. And the processed sample is with lightweight and low cost. To verify the performance of the proposed origami polarization converter, a Miura origami structure loaded with metal split rings is designed and fabricated. The operating frequency of the structure can be tuned in different folding states. In addition, by controlling the folding angle θ$\theta$, linear-to-linear and linear-to-circular polarization converters can be realized at different folding states. The proposed Miura origami polarization conversion metasurface provides a new idea for reconfigurable linear polarization conversion and multifunctional devices.

中文翻译：

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基于 Miura 折纸的可重构偏振转换器，用于电磁波的多功能控制

偏振是电磁波的基本特性之一，其灵活控制在许多实际应用中非常重要。目前，大多数多功能偏振超表面都是基于PIN和变容二极管的电可调，操作方便，实时性强。但其仍存在平面结构控制自由度少、电路复杂、样品体积大、成本高等问题。鉴于这些缺点，本文提出了一种基于Miura折纸的可重构偏振转换超表面，用于电磁波的多功能控制。通过调节折叠角θ$\theta$来改变电偶极子之间的相互作用，从而调节偏振转换的工作频率和反射波的偏振状态。这种机械控制方法为操纵电磁波带来了更多的自由度。且加工后的样品重量轻、成本低。为了验证所提出的折纸偏振转换器的性能，设计并制造了装有金属开口环的 Miura 折纸结构。该结构的工作频率可以在不同的折叠状态下进行调节。此外，通过控制折叠角度θ$\theta$，可以在不同的折叠状态下实现线-线和线-圆偏振转换器。Miura折纸偏振转换超表面为可重构线性偏振转换和多功能器件提供了新的思路。