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2008 International Workshop on Metamaterials最新文献

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Electromagnetic beam modulation and planar invisibility cloak through transformation optical structures 通过变换光学结构实现电磁波束调制和平面隐身
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723555
Xiaofei Xu, Yu Hao, T. Jiang, Yijun Feng
{"title":"Electromagnetic beam modulation and planar invisibility cloak through transformation optical structures","authors":"Xiaofei Xu, Yu Hao, T. Jiang, Yijun Feng","doi":"10.1109/META.2008.4723555","DOIUrl":"https://doi.org/10.1109/META.2008.4723555","url":null,"abstract":"Meta-material based on the form-invariant Maxwellpsilas equations under coordinate transformations has opened up new possibilities to manipulate the electromagnetic fields. In this paper we report on applying the finite-embedded coordinate transformation method to design electromagnetic beam modulation devices. We present the design procedures and the full wave electromagnetic simulations results, which clearly confirm the performance of the proposed devices. After the tutorial, one application example of planar invisibility cloak is also given using such beam-modulated blocks.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133835746","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: 0
Enhancing microwave absorption properties of materials using metamaterials 利用超材料增强材料的微波吸收性能
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723608
Yanhong Zou, Leyong Jiang, S. Wen, Yongjun Qing, Zhixiang Tang, W. Shu, Hailu Luo, D. Fan
{"title":"Enhancing microwave absorption properties of materials using metamaterials","authors":"Yanhong Zou, Leyong Jiang, S. Wen, Yongjun Qing, Zhixiang Tang, W. Shu, Hailu Luo, D. Fan","doi":"10.1109/META.2008.4723608","DOIUrl":"https://doi.org/10.1109/META.2008.4723608","url":null,"abstract":"We proposed and demonstrated a scheme to enhance and tune absorption properties of conventional microwave absorbing materials (MAMs) by metamaterials. By covering a MAM, saying, carbonyl iron powder coating, with metamaterials composed of split-ring resonators(SRRs) and wires, we show, both by experiments and by simulations, that the maximum reflection loss is increased significantly and the frequency region for absorption is shifted to lower frequency. The frequency region in which the maximum reflection loss is less than -10 dB shifts from 5-7 GHz to 4.2-6.2 GHz for perpendicular polarization electromagnetic waves and to 4-9 GHz for parallel polarization waves. Simulation results reveal that the magnetic resonance obtained by SRRs and the electric resonance obtained by copper wires are the main factors in enhancing and tuning microwave absorption properties.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128013759","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: 4
Time-domain measurement for evanescent-wave amplification 倏逝波放大的时域测量
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723583
Youzhen Wang, Yewen Zhang, Liwei Zhang, Li He
{"title":"Time-domain measurement for evanescent-wave amplification","authors":"Youzhen Wang, Yewen Zhang, Liwei Zhang, Li He","doi":"10.1109/META.2008.4723583","DOIUrl":"https://doi.org/10.1109/META.2008.4723583","url":null,"abstract":"We use the time-domain method to study the anomalous evanescent wave amplification phenomenon arising when pairing together materials slabs with opposite signs for the real parts of their constitutive parameters. Transmission coefficient shows that there exists a complete tunneling frequency point which behaves total transparent to incoming waves. It is observed that electric field is exponentially increasing-decreasing distributed. Energy is highest at the interface. The phase doesnpsilat delay when waves travel through the pair. Time-domain measurement also demonstrates that the bilayer need some time to achieve a final growing-exponential distribution inside the bilayer.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114437418","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: 0
Random gradient index metamaterials 随机梯度指数超材料
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723589
Ruopeng Liu, C. Ji, J. Mock, T. Cui, David R. Smith
{"title":"Random gradient index metamaterials","authors":"Ruopeng Liu, C. Ji, J. Mock, T. Cui, David R. Smith","doi":"10.1109/META.2008.4723589","DOIUrl":"https://doi.org/10.1109/META.2008.4723589","url":null,"abstract":"We report a broadband reflectionless gradient random medium design and experimental implementation by using metamaterial technology. This gradient random medium matches the impedance of the air and gradually change its refraction index randomly, creating a puzzle for wave propagation in front of a metal conductor. Thus, such type of coating is expected to diffuse the reflection waves from a conductor metal. The implementation of such device needs, in our experiment, more than 30,000 different unit cells. Obviously, such large scale design and fabrication mask generation have been out of the scope of traditional manual production. We propose an automatical metamaterial design system, which made the implementation of gradient random medium possible and provide the technique of large scale metamaterial unit-cell design. The design is verified by the 2D near field scanning mapper measurement and the angular measurement. The measurement results show that the designed sample works well as we expected.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114969372","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: 4
Extraordinary transmission in metamaterial-loaded waveguides: effective-medium models, microwave experiments and tight binding studies 超材料负载波导中的非凡传输:有效介质模型、微波实验和紧密结合研究
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723581
Hao Xu, Zhiyu Wang, J. Hao, Jiajie Dai, L. Ran, J. Kong, L. Zhou
{"title":"Extraordinary transmission in metamaterial-loaded waveguides: effective-medium models, microwave experiments and tight binding studies","authors":"Hao Xu, Zhiyu Wang, J. Hao, Jiajie Dai, L. Ran, J. Kong, L. Zhou","doi":"10.1109/META.2008.4723581","DOIUrl":"https://doi.org/10.1109/META.2008.4723581","url":null,"abstract":"We show that a metallic waveguide behaves as an electric (magnetic) plasma for transverse-electric (transverse-magnetic) polarized electromagnetic (EM) waves at frequencies below cut-off value. Inserting anisotropic resonance structures of either electric or magnetic type into a waveguide, we find extraordinary transmissions of EM waves with different polarizations through the waveguide at frequencies well below the waveguidepsilas cut-off value, following two different mechanisms. Microwave experiments, in excellent agreements with finite-different-time-domain simulations, are performed to successfully demonstrate all theoretical predictions. We then perform a systematic study based on tight-binding approximation to understand the underlying physics behind such unusual behaviors.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129824732","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: 0
Microwave heating by using flat LHM lens 微波加热采用平板LHM透镜
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723617
Yu Gong, Hongjin Wang, G. Wang
{"title":"Microwave heating by using flat LHM lens","authors":"Yu Gong, Hongjin Wang, G. Wang","doi":"10.1109/META.2008.4723617","DOIUrl":"https://doi.org/10.1109/META.2008.4723617","url":null,"abstract":"Microwave heating system for hyperthermia by using four flat LHM lenses orthogonally-deployed around the heating region is proposed and simulated. For the process of heating a 6 mm-diameter tumor in homogeneous lossy dielectric medium, our 2-D FDTD simulations indicate that microwave energy can be concentrated tightly inside the tumor. Also the temperature distribution is derived through bio-heat equation (BHE), which has been solved by finite differential approach. Due to the admiring focusing properties of LHM lens, the temperature inside the tumor may rise from 37degC to more than 42.65degC during one hour with average input power density of 1.60 W/cm at 6 GHz, while the temperature of normal tissue keeps well below 42degC as the requirement of hyperthermia.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128951555","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
Propagation of evanescent waves within one-dimensional photonic crystal composed of single-negative materials 由单负材料组成的一维光子晶体中倏逝波的传播
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723579
Yuntuan Fang
{"title":"Propagation of evanescent waves within one-dimensional photonic crystal composed of single-negative materials","authors":"Yuntuan Fang","doi":"10.1109/META.2008.4723579","DOIUrl":"https://doi.org/10.1109/META.2008.4723579","url":null,"abstract":"The propagation of evanescent waves within one-dimensional photonic crystal (1DPC) containing two kinds of single-negative media are studied by the finite-difference time-domain (FDTD) method. The evanescent waves within such 1DPC structure have two peculiar properties compared with propagation waves. The first is that the field is localized at the interface of MNG layer and ENG layer; the second is that the vibration of the evanescent waves are all in-phase. These results will help people to further understand the propagation behaviors of evanescent waves within the 1DPC.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125300814","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: 0
Omnidirectional linear polarizer based on uniaxial dielectric-magnetic materials 基于单轴介质磁性材料的全向线偏振器
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723606
W. Shu, Hailu Luo, Zhixiang Tang, Yanhong Zou, S. Wen, D. Fan
{"title":"Omnidirectional linear polarizer based on uniaxial dielectric-magnetic materials","authors":"W. Shu, Hailu Luo, Zhixiang Tang, Yanhong Zou, S. Wen, D. Fan","doi":"10.1109/META.2008.4723606","DOIUrl":"https://doi.org/10.1109/META.2008.4723606","url":null,"abstract":"We theoretically propose a scheme to construct an omnidirectional linear polarizer by using the uniaxial dielectric-magnetic material (UDMM). Corresponding to the dispersion relation for the UDMM, the wave-vector normal surface for the two eigenmodes is the combination of one double-sheeted hyperboloids and one ellipsoids. We study the propagation of electromagnetic waves in UDMM and find that, the UDMM can render one of TE and TM waves being totally reflected, while the other being totally transmitted. Therefore, such UDMM is a natural candidate for omnidirectional linear polarizers that have great advantages over conventional counterparts. Simulated results are given and validates the theoretical analysis.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125348147","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: 0
A novel branch-line coupler based on the composite right/left handed TL structure 一种基于左/右复合TL结构的分支线耦合器
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723624
Ling Wang, T. Cui
{"title":"A novel branch-line coupler based on the composite right/left handed TL structure","authors":"Ling Wang, T. Cui","doi":"10.1109/META.2008.4723624","DOIUrl":"https://doi.org/10.1109/META.2008.4723624","url":null,"abstract":"In this paper, a new branch-line coupler (BLC) is designed, which is based on the composite right/left handed transmission line structure first proposed by Itoh and Caloz. Both the theoretical analysis and the simulation results are presented in this paper. It is shown that the dimensions of CRLH-based hybrid coupler are much smaller than those of the conventional counterpart, which may find important applications in the design of microwave and millimeter wave integrated circuits.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"22 6S 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122811181","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: 1
Invisibility cloaks—to manipulate light with materials and eliminate scattering of objects 隐形斗篷——用材料操纵光线，消除物体的散射
2008 International Workshop on Metamaterials Pub Date : 2008-12-22 DOI: 10.1109/META.2008.4723540
C. Li, K. Yao, F. Li
{"title":"Invisibility cloaks—to manipulate light with materials and eliminate scattering of objects","authors":"C. Li, K. Yao, F. Li","doi":"10.1109/META.2008.4723540","DOIUrl":"https://doi.org/10.1109/META.2008.4723540","url":null,"abstract":"Invisibility cloaks, an advanced stealth technology that completely eliminates the scattering of an object in parts of the electromagnetic (EM) spectrum is proposed by scientists in theory with some verification experiments. The complex medium parameters for cloaks with arbitrary geometries can be analytically obtained, which highly improve the flexibility for cloak design. The concept of the invisibility cloaks may lead to new and unexpected developments in stealth technology.","PeriodicalId":345360,"journal":{"name":"2008 International Workshop on Metamaterials","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121436149","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: 0
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