EPJ Applied Metamaterials最新文献_第4页

Carbon fiber skeleton/silver nanowires composites with tunable negative permittivity behavior 具有可调负介电常数行为的碳纤维骨架/银纳米线复合材料

IF 1.6

EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI: 10.1051/EPJAM/2020019

Y. An, Jinyuan Qin, Kai Sun, Jiahong Tian, Zhongyang Wang, Yaman Zhao, Xiaofen Li, R. Fan

引用次数: 0

Epsilon-negative media from the viewpoint of materials science 从材料科学的角度看负负介质

IF 1.6

EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI: 10.1051/EPJAM/2021005

Guohua Fan, Kai Sun, Qing Hou, Zhongyang Wang, Yao Liu, R. Fan

引用次数: 15

Tailoring the scattering properties of coding metamaterials based on machine learning 基于机器学习的编码超材料散射特性裁剪

IF 1.6

EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI: 10.1051/EPJAM/2021006

Shuai Yang, Kuang Zhang, Xumin Ding, Guohui Yang, Qun Wu

{"title":"Tailoring the scattering properties of coding metamaterials based on machine learning","authors":"Shuai Yang, Kuang Zhang, Xumin Ding, Guohui Yang, Qun Wu","doi":"10.1051/EPJAM/2021006","DOIUrl":"https://doi.org/10.1051/EPJAM/2021006","url":null,"abstract":"Diverse electromagnetic (EM) responses of coding metamaterials have been investigated, and the general research method is to use full-wave simulation. But if we only care its scattering properties, it is not necessary to perform full-wave simulation, which is usually time-consuming. Machine learning has significantly impelled the development of automatic design and optimize coding matrix. Based on metamaterial particle that has multiple response and genetic algorithm which is coupled with the scattering pattern analysis, we can optimize the coding matrix quickly to tailor the scattering properties without conducting full-wave simulation a lot of times for optimization. Since the coding matrix control of each particle allow modulation of EM wave, various EM phenomena can be achieved easier. In this paper, we proposed two reflective unitcells with different reflection phase, and then a semi-analytical model is built up for unitcells. To tailor the scattering properties, genetic algorithm normally based on binary coding, is coupled with the scattering pattern analysis in order to optimize the coding matrix. Finally, simulation results are compared with the semi-analytical calculation results and it is found that the simulation results agree very well with the theoretical values.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57823028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Paper-based flexible metamaterial for microwave applications 微波应用的纸基柔性超材料

IF 1.6

EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI: 10.1051/EPJAM/2020016

Zidong Zhang, Yaman Zhao, Guohua Fan, Wenjin Zhang, Yao Liu, Jiurong Liu, R. Fan

引用次数: 1

A high-efficiency and ultrathin transmission-type circular polarization converter based on surface structure 一种基于表面结构的高效超薄透射型圆偏振变换器

IF 1.6

EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI: 10.1051/EPJAM/2021002

Peng Xu, W. Jiang, Xiao Cai, Y. Gou, T. Cui

引用次数: 0

Dynamically reconfigurable high-efficiency terahertz metasurface holograms 动态可重构的高效太赫兹超表面全息图

IF 1.6

EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI: 10.1051/EPJAM/2020012

Mengyuan Hu, Z. Tian

引用次数: 0

Dual-band beam steering THz antenna using active frequency selective surface based on graphene 基于石墨烯有源频率选择表面的双频波束导向太赫兹天线

IF 1.6

EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI: 10.1051/EPJAM/2021004

Yao-Jia Yang, Bian Wu, Yutong Zhao, Chi-Fan

引用次数: 6

Vertical interface augmented tunability of scattering spectra in ferromagnetic microwire/silicone rubber metacomposites 垂直界面增强了铁磁微丝/硅橡胶复合材料散射光谱的可调性

IF 1.6

EPJ Applied Metamaterials Pub Date : 2021-01-01 DOI: 10.1051/EPJAM/2021003

A. Uddin, F. Qin, D. Estevez, H. Peng

{"title":"Vertical interface augmented tunability of scattering spectra in ferromagnetic microwire/silicone rubber metacomposites","authors":"A. Uddin, F. Qin, D. Estevez, H. Peng","doi":"10.1051/EPJAM/2021003","DOIUrl":"https://doi.org/10.1051/EPJAM/2021003","url":null,"abstract":"Previously, we have demonstrated a viable approach based on microstructural and topological modulation of periodically arranged elements to program wave scattering in ferromagnetic glass-coated microwire metacomposites. In order to fully exploit the intrinsic structure of the composite, here, we implement the concept of composites plainification by an in-built vertical interface on randomly dispersed short-cut microwires allowing the adjustment of electromagnetic properties to a larger extent. Such interface was modified through arranging wires with different internal structures in two separated regions and by alternating these regions through wire concentration variations associated with polarization differences across the interface. When the wire concentration was equal in both regions, two well-defined transmission windows with varied amplitude and bandwidth were generated. Wire concentration fluctuations resulted in strong scattering changes ranging from broad passbands to pronounced stopbands, demonstrating the intimate relationship between wire content and space charge variations at the interface. This provides a new method to rationally exploit interfacial effects and microstructural features of microwire metacomposites. Moreover, the advantages of enabling tunable scattering spectra by merely 0.053 vol.% of fillers and simple structure make the proposed plainification strategy instrumental to designing filters with broadband frequency selectivity.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57823439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Significant enhancement of magnetic shielding effect by using the composite metamaterial composed of mu-near-zero media and ferrite 用mu近零介质和铁氧体组成的复合超材料显著增强了磁屏蔽效果

IF 1.6

EPJ Applied Metamaterials Pub Date : 2020-11-30 DOI: 10.1051/EPJAM/2021008

Xu Chen, Yuqian Wang, Zhiwei Guo, Xian Wu, Fengqing Yang, Yong Sun, Yunhui Li, Haitao Jiang, Hong Chen

引用次数: 3

Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model 超表面虚拟吸收器:通过等效集总电路模型揭示工作条件

IF 1.6

EPJ Applied Metamaterials Pub Date : 2020-11-18 DOI: 10.36227/techrxiv.13247426

A. Marini, D. Ramaccia, A. Toscano, F. Bilotti

{"title":"Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model","authors":"A. Marini, D. Ramaccia, A. Toscano, F. Bilotti","doi":"10.36227/techrxiv.13247426","DOIUrl":"https://doi.org/10.36227/techrxiv.13247426","url":null,"abstract":"Virtual absorption concept has been recently introduced as a new phenomenon observed in electromagnetics and optics consisting of theoretically unlimited accumulation of energy within a finite volume of material without dissipation. The anomalous behaviour is achieved by engaging the complex zero scattering eigenmodes of the virtual absorbing system by illuminating it with a proper complex frequency ω = ω\u0000\u0000r\u0000 + jω\u0000\u0000i\u0000, whose value is strictly determined by the system characteristics. In this paper, we investigate on the position of the zero-pole scattering pairs in the complex frequency plane as a function of the input impedance of the metasurface-based lossless virtual absorber. We analytically derive the conditions under which a properly modulated monochromatic plane wave can be virtually absorbed by the system and stored within its volume. The analysis is developed by modelling the propagation of a normally impinging plane wave through its equivalent transmission line model terminated in an arbitrary reactive load, which in turn models the input impedance of the metasurface-based system under consideration. The study allows to determine a priori whether the metasurface-based system can support the virtual absorption or not by evaluating the time-constant from its equivalent circuit.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2020-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45446244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10