Ultra-wideband high-efficiency reflective linear-to-circular polarization converter based on metasurface at terahertz frequencies
Ultra-wideband high-efficiency reflective linear-to-circular polarization converter based on metasurface at terahertz frequencies
复制标题
基于超表面的太赫兹频率超宽带高效反射式线圆偏振转换器
DOI：
10.1364/oe.25.027616
复制
发表时间：
2017-10-30
期刊：
影响因子：
3.8
通讯作者：
Cao, Weiping
中科院分区：
文献类型：
--
作者：
Jiang, Yannan;Wang, Lei;Cao, Weiping
电磁波的偏振转换，特别是线-圆（LTC）偏振转换，在实际应用中具有重要意义。在这项研究中，我们提出了一个超宽带高效率的反射式LTC偏振转换器的超表面的基础上，在太赫兹制度。它由周期性的单胞组成，每个单胞由双分裂谐振方环、介质层和全反射金镜组成。在0.60 - 1.41 THz的频率范围内，反射系数的幅度达到约0.7，并且反射波的两个正交电场分量之间的相位差接近90度或-270度。结果表明，相对带宽可达80%，转换效率大于88%，实现了超宽带高效率的LTC偏振转换。最后，揭示了偏振转换的物理机制。该转换器在天线设计、电磁测量和隐身技术等方面具有潜在的应用价值。(C)根据OSA开放获取出版协议的条款，2017年美国光学学会
The polarization conversion of electromagnetic (EM) waves, especially linear-to-circular (LTC) polarization conversion, is of great significance in practical applications. In this study, we propose an ultra-wideband high-efficiency reflective LTC polarization converter based on a metasurface in the terahertz regime. It consists of periodic unit cells, each cell of which is formed by a double split resonant square ring, dielectric layer, and fully reflective gold mirror. In the frequency range of 0.60 - 1.41 THz, the magnitudes of the reflection coefficients reach approximately 0.7, and the phase difference between the two orthogonal electric field components of the reflected wave is close to 90 degrees or -270 degrees. The results indicate that the relative bandwidth reaches 80% and the efficiency is greater than 88%, thus, ultra-wideband high-efficiency LTC polarization conversion has been realized. Finally, the physical mechanism of the polarization conversion is revealed. This converter has potential applications in antenna design, EM measurement, and stealth technology. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement