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基于具有超高隔离度的单向表面磁等离子体激元的宽带隔离器。

Wideband isolator based on one-way surface magnetoplasmons with ultra-high isolation.

作者信息

Jiang Tao, Liang Dan, Liang Huajie, Zou Lin, Zhou Tianchi, Li Shiqing, Shen Linfang

机构信息

Huzhou Key Laboratory of Terahertz Integrated Circuits and Systems, Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, 313001, China.

School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China.

出版信息

Sci Rep. 2024 Jul 29;14(1):17474. doi: 10.1038/s41598-024-68602-5.

DOI:10.1038/s41598-024-68602-5
PMID:39079954
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11289114/
Abstract

In this paper, we present a new type of isolator based on one-way surface magnetoplasmons (SMPs) at microwave frequencies, and it is the first time that an experimental prototype of isolator with wideband and ultra-high isolation is realized using SMP waveguide. The proposed model with gyromagnetic and dielectric layers is systematically analyzed to obtain the dispersion properties of all the possible modes, and a one-way SMP mode is found to have the unidirectional transmission property. In simulation and experiment with metallic waveguide loaded with yttrium-iron-garnet (YIG) ferrite, the scattering parameters and the field distributions agree well with the analysis and verify the one-way transmission property. The isolation is found to be as high as 80 dB and the typical value of insertion loss is 1 dB. Besides, the one-way transmission band can be controlled by changing the magnetic bias. From theoretical analysis and simulation, it is found that with a tiny value of 10 Oe of the magnetic bias, the relative bandwidth can be tuned to be greater than 50%. Compared with conventional isolators, this one-way SMP isolator has the advantages of ultra-high isolation, wide relative frequency band, and requires much smaller bias field, which has promising potential in non-reciprocal applications.

摘要

在本文中，我们提出了一种基于微波频率下单向表面磁等离子体激元（SMPs）的新型隔离器，并且首次利用SMP波导实现了具有宽带和超高隔离度的隔离器实验原型。对所提出的具有旋磁层和介质层的模型进行了系统分析，以获得所有可能模式的色散特性，并且发现一种单向SMP模式具有单向传输特性。在加载钇铁石榴石（YIG）铁氧体的金属波导的仿真和实验中，散射参数和场分布与分析结果吻合良好，验证了单向传输特性。发现隔离度高达80 dB，插入损耗的典型值为1 dB。此外，单向传输带可以通过改变磁偏置来控制。从理论分析和仿真来看，发现当磁偏置值小至10 Oe时，相对带宽可以调谐到大于50%。与传统隔离器相比，这种单向SMP隔离器具有超高隔离度、宽相对频带的优点，并且所需的偏置场小得多，在非互易应用中具有广阔的潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/59e1/11289114/942fd47dd597/41598_2024_68602_Fig15_HTML.jpg
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