Linear and Nonlinear Polarization Syntheses and Their Programmable Controls based on Anisotropic Time-Domain Digital Coding Metasurface
Linear and Nonlinear Polarization Syntheses and Their Programmable Controls based on Anisotropic Time-Domain Digital Coding Metasurface
复制标题
DOI：
10.1002/sstr.202000060
复制
发表时间：
2021-01-01
期刊：
影响因子：
15.9
通讯作者：
Cui, Tie Jun
中科院分区：
文献类型：
--
作者：
Ke, Jun Chen;Dai, Jun Yan;Cui, Tie Jun
空间偏振转换器可以将入射波的偏振态转换到特定频段的另一种偏振态。传统的偏振转换器件主要包括天然材料和人工电磁结构，它们通常对入射偏振态敏感，无法实现非线性谐波的偏振操纵。这些缺点限制了它们在无线通信和雷达探测应用中的发展。为此，提出了一种基于各向异性时域数字编码元表面的通用偏振调节方案，该方案可实现线性和非线性偏振合成，并可实现真实的实时可编程控制。该方案将非线性调制理论与偏振转换方法相结合，扩大了偏振调节的范围。设计并制作了一个各向异性时域数字编码元表面，验证了该方案的可行性。理论预测与实验结果吻合较好。本研究的结果有望促进时空极化规则的发展，并为精确的电磁检测提供有效的方法。
Spatial polarization converter can shift the polarization state of incident wave to another state in a specific frequency band. The traditional polarization conversion devices mainly include natural materials and artificial electromagnetic (EM) structures, which are generally sensitive to the incident polarization states and cannot realize polarization manipulations of nonlinear harmonics. These drawbacks limit their developments in wireless communications and radar detection applications. Herein, a general polarization regulation scheme based on anisotropic time-domain digital coding metasurface is proposed that can achieve both linear and nonlinear polarization syntheses and realize their programmable controls in real time. In this scheme, a nonlinear modulation theory into the polarization conversion methods is integrated, and thus, the scope of the polarization regulation is expanded. An anisotropic time-domain digital coding metasurface is designed and fabricated to validate the feasibility of the proposed scheme. Theoretical predictions have good agreements with the experiments. The results of this study are expected to promote the developments of space-time-polarization regulations and provide efficient approaches for precise EM detections.