Metamaterials最新文献_第8页

Congress 2009 Special Issue Editorial 国会2009年特刊社论

Metamaterials Pub Date : 2010-08-01 DOI: 10.1016/j.metmat.2010.06.001

Filiberto Bilotti, Rick Ziolkowski

引用次数: 0

Antenna miniaturization for vehicular platforms using printed coupled lines emulating magnetic photonic crystals 利用模拟磁性光子晶体的印刷耦合线实现车载平台天线小型化

Metamaterials Pub Date : 2010-08-01 DOI: 10.1016/j.metmat.2010.03.001

Erdinc Irci, Kubilay Sertel, John L. Volakis

引用次数: 13

Extreme electromagnetic boundary conditions and their manifestation at the inner surfaces of spherical and cylindrical cloaks 球形和圆柱形斗篷内表面的极端电磁边界条件及其表现

Metamaterials Pub Date : 2010-08-01 DOI: 10.1016/j.metmat.2010.03.006

Arthur D. Yaghjian

{"title":"Extreme electromagnetic boundary conditions and their manifestation at the inner surfaces of spherical and cylindrical cloaks","authors":"Arthur D. Yaghjian","doi":"10.1016/j.metmat.2010.03.006","DOIUrl":"10.1016/j.metmat.2010.03.006","url":null,"abstract":"<div>Generalized electromagnetic boundary conditions are derived for interfaces containing surface layers of electric and magnetic polarization. Next, the singularities in the fields and polarization densities at the inner surfaces of spherical and circular cylindrical cloaks illuminated by sources inside the cavities of the cloaks are determined from a plane-wave analysis of fields incident on a half space of material characterized by a relative permittivity–permeability dyadic equal to that of the inner material surfaces of the cloaks. Lastly, these singular fields and polarization densities are shown to satisfy the generalized boundary conditions. For sources inside the cloak cavities, it is found that the inner surfaces of spherical cloaks, unlike the inner surfaces of cylindrical cloaks, behave as “DB boundaries” at which <math><mover><mrow><mstyle><mtext>n</mtext></mstyle></mrow><mo>ˆ</mo></mover><mo>⋅</mo><mstyle><mtext>D</mtext></mstyle></math> and <math><mover><mrow><mstyle><mtext>n</mtext></mstyle></mrow><mo>ˆ</mo></mover><mo>⋅</mo><mstyle><mtext>B</mtext></mstyle></math> are zero.</div>","PeriodicalId":100920,"journal":{"name":"Metamaterials","volume":"4 2","pages":"Pages 70-76"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.metmat.2010.03.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86280792","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: 24

Cloaking a receiving antenna or a sensor with plasmonic metamaterials 用等离子体超材料掩盖接收天线或传感器

Metamaterials Pub Date : 2010-08-01 DOI: 10.1016/j.metmat.2010.03.005

Andrea Alù , Nader Engheta

引用次数: 39

Surface plasmons in noble metal films 贵金属薄膜中的表面等离子体

Metamaterials Pub Date : 2010-08-01 DOI: 10.1016/j.metmat.2010.04.002

A.G. Schuchinsky

{"title":"Surface plasmons in noble metal films","authors":"A.G. Schuchinsky","doi":"10.1016/j.metmat.2010.04.002","DOIUrl":"10.1016/j.metmat.2010.04.002","url":null,"abstract":"<div>The surface plasmons (SPs) guided by the films of noble metals have been modelled using the measured optical constants of Ag, Au and Cu. It is shown that Drude permittivity with the slowly varying plasma ωp(λ) and collision ν(λ) frequencies, retrieved from the experimental data, provides a comprehensive description of the main features of the guided SP modes and the SP resonances. The effects of dispersion and losses on the SP properties have been separated by scaling ν(λ) in the numerical analysis of the full-wave dispersion equation. Using Drude permittivity with the scaled ν(λ), it is demonstrated that in the absence of SP resonances, the ωp(λ) dispersion but not damping primarily determine the maximum attainable slow wave factor of SP. A detailed qualitative interpretation of the SP characteristics in the metallic films with the measured permittivity shed the light on the phenomenological mechanisms underlying the SP properties in the films of noble metals on dielectric substrates.</div>","PeriodicalId":100920,"journal":{"name":"Metamaterials","volume":"4 2","pages":"Pages 61-69"},"PeriodicalIF":0.0,"publicationDate":"2010-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.metmat.2010.04.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86810611","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

Characteristic properties of electromagnetic wave interaction with uniaxial absorbing metamaterials: A case of the near-zero axial parameter 电磁波与单轴吸收超材料相互作用的特性:轴向参数接近零的一个例子

Metamaterials Pub Date : 2010-05-01 DOI: 10.1016/j.metmat.2010.03.003

E.G. Starodubtsev

引用次数: 6

Flexible magnetoinductive ring MRI detector: Design for invariant nearest-neighbour coupling 柔性磁感应环MRI探测器:不变最近邻耦合设计

Metamaterials Pub Date : 2010-05-01 DOI: 10.1016/j.metmat.2009.12.001

R.R.A. Syms , T. Floume , I.R. Young , L. Solymar , M. Rea

{"title":"Flexible magnetoinductive ring MRI detector: Design for invariant nearest-neighbour coupling","authors":"R.R.A. Syms , T. Floume , I.R. Young , L. Solymar , M. Rea","doi":"10.1016/j.metmat.2009.12.001","DOIUrl":"https://doi.org/10.1016/j.metmat.2009.12.001","url":null,"abstract":"<div>A flexible birdcage-type resonant RF detector for magnetic resonance imaging is described. The circuit consists of a polygonal ring of magnetically coupled L–C resonators, a periodic structure supporting backward magnetoinductive waves. The elements are mechanically linked to allow relative rotation, and the pivot point is optimised to hold the nearest-neighbour coupling coefficient invariant to small changes in the angle of an undistorted joint. Simple theory based on a parallel wire approximation to rectangular inductors is developed to allow the variation of the coupling coefficient with angle and radius to be estimated, and hence determine the location of the pivot. The optimised pivot is shown to reduce resonance splitting in octagonal rings. However, second-neighbour interactions degrade performance. The theory is verified experimentally using printed circuit board elements coupled by flexible hinges, and the invariance of the nearest-neighbour coupling coefficient is confirmed. Octagonal ring resonators are constructed for operation at 63.8  T field. Images are obtained from undistorted and distorted resonators and the effect of distortion on SNR is quantified.</div>","PeriodicalId":100920,"journal":{"name":"Metamaterials","volume":"4 1","pages":"Pages 1-14"},"PeriodicalIF":0.0,"publicationDate":"2010-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.metmat.2009.12.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91736027","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: 32

Distance limit of the directionality conditions for the scattering of nanoparticles 纳米粒子散射的方向性条件的距离限制

Metamaterials Pub Date : 2010-05-01 DOI: 10.1016/j.metmat.2010.01.001

Braulio García-Cámara, José María Saiz, Francisco González, Fernando Moreno

引用次数: 5

A novel compact volumetric metamaterial structure with asymmetric transmission and polarization conversion 一种具有非对称传输和极化转换的新型致密体积超材料结构

Metamaterials Pub Date : 2010-05-01 DOI: 10.1016/j.metmat.2010.04.003

Nathan R. Labadie, Satish K. Sharma

{"title":"A novel compact volumetric metamaterial structure with asymmetric transmission and polarization conversion","authors":"Nathan R. Labadie, Satish K. Sharma","doi":"10.1016/j.metmat.2010.04.003","DOIUrl":"https://doi.org/10.1016/j.metmat.2010.04.003","url":null,"abstract":"<div>The novel folded ring resonator (FRR) is uniaxial bi-anisotropic and possesses a strong resonant magnetic bandgap. Within the bandgap at 4.75 <!-->GHz, the cubic FRR is significantly subwavelength because it is <math><mi>λ</mi></math>/13 along any coordinate axis and <math><mi>λ</mi></math>/7 along the body diagonal. The bulk behavior of a cubic lattice of the novel structure demonstrates backward mode behavior centered near the frequency 4.5 GHz with a bandwidth of 12.2% as derived from the dispersion curve. Parametric sweeps of the critical dimensions are presented showing the tunability of the structure. The field nature of the backward mode is explained in terms of the realized simultaneous electric and magnetic dipole reponses. For finite thickness layers of the novel FRR, the transmitted phase is shown to indicate the presence of a backward mode in agreement with the bulk response. The novel structure also functions as a linear to circular polarizer for a single layer. Due to the asymmetry of the structure, asymmetric transmission occurs within the backward mode in the form of circular cross-polarization dichroism and direction dependent transmission. Although the backward mode occurs for any incident angle it is shown to be anisotropic in nature. A backward mode bandwidth as wide as 23.3% is achieved along the body diagonal of the cubic unit cell, which is the principal axis.</div>","PeriodicalId":100920,"journal":{"name":"Metamaterials","volume":"4 1","pages":"Pages 44-57"},"PeriodicalIF":0.0,"publicationDate":"2010-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.metmat.2010.04.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91736024","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: 8

Metamaterials and the homogenization of composite materials 超材料与复合材料的均质化

Metamaterials Pub Date : 2010-05-01 DOI: 10.1016/J.METMAT.2010.02.003

W. T. Perrins, R. McPhedran

引用次数: 21