Ultrabroadband chiral metasurface for linear polarization conversion and asymmetric transmission based on enhanced interference theory

IF 3.3 2区物理与天体物理 Q2 OPTICS

Chinese Optics Letters Pub Date : 2023-01-01 DOI:10.3788/col202321.113602

Jingcheng Zhao, Nan Li, Yongzhi Cheng

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引用次数: 1

Abstract

In this paper, we propose an ultrabroadband chiral metasurface (CMS) composed of S-shaped resonator structures situated between two twisted subwavelength gratings and dielectric substrate. This innovative structure enables ultrabroadband and high-efficiency linear polarization (LP) conversion, as well as asymmetric transmission (AT) effect in the microwave region. The enhanced interference effect of the Fabry–Perot-like resonance cavity greatly expands the bandwidth and efficiency of LP conversion and AT effect. Through numerical simulations, it has been revealed that the cross-polarization transmission coefficients for normal forward (-z) and backward (+z) incidence exceed 0.8 in the frequency range of 4.13 to 17.34 GHz, accompanied by a polarization conversion ratio of over 99%. Furthermore, our microwave experimental results validate the consistency among simulation, theory, and measurement. Additionally, we elucidate the distinct characteristics of ultrabroadband LP conversion and significant AT effect through analysis of polarization azimuth rotation and ellipticity angles, total transmittance, AT coefficient, and electric field distribution. The proposed CMS structure shows excellent polarization conversion properties via AT effect and has potential applications in areas such as radar, remote sensing, and satellite communication.

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基于增强干涉理论的线偏振转换和非对称传输超宽带手性超表面

本文提出了一种由位于两个扭曲亚波长光栅和介质衬底之间的s形谐振腔结构组成的超宽带手性超表面(CMS)。这种创新的结构实现了超宽带和高效率的线性极化(LP)转换，以及微波区域的不对称传输(AT)效应。类法布里-珀罗谐振腔的干涉效应增强，极大地扩展了LP转换和AT效应的带宽和效率。通过数值模拟发现，在4.13 ~ 17.34 GHz频率范围内，正向(-z)和反向(+z)入射交叉极化透射系数大于0.8，极化转化率大于99%。此外，我们的微波实验结果验证了仿真、理论和测量的一致性。此外，通过对极化方位角、椭圆度角、总透过率、AT系数和电场分布的分析，阐明了超宽带LP转换的显著特性和显著的AT效应。所提出的CMS结构通过AT效应表现出优异的极化转换性能，在雷达、遥感和卫星通信等领域具有潜在的应用前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chinese Optics Letters 物理-光学

CiteScore

5.60

自引率

20.00%

发文量

180

审稿时长

2.3 months

期刊介绍： Chinese Optics Letters (COL) is an international journal aimed at the rapid dissemination of latest, important discoveries and inventions in all branches of optical science and technology. It is considered to be one of the most important journals in optics in China. It is collected by The Optical Society (OSA) Publishing Digital Library and also indexed by Science Citation Index (SCI), Engineering Index (EI), etc. COL is distinguished by its short review period (~30 days) and publication period (~100 days). With its debut in January 2003, COL is published monthly by Chinese Laser Press, and distributed by OSA outside of Chinese Mainland.