{"title":"Features of transmission of electromagnetic waves through composite nanoresonators including epsilon-near-zero metamaterials","authors":"E. Starodubtsev","doi":"10.1051/epjam/2020001","DOIUrl":"https://doi.org/10.1051/epjam/2020001","url":null,"abstract":"Transmission of electromagnetic waves through nanometric multilayers (nanoresonators) including a main composite layer made of two alternating strips of low-absorbing dielectrics that is sandwiched between epsilon-near-zero (ENZ) or metallic spacer layers has been modeled. Analytical models are based on exact solutions of electromagnetic boundary problems. The spacers with the definite properties lead to extreme dependences of amplitude transmission coefficients on the system parameters and drastic increase in phase difference of the transmitted waves. These effects are most pronounced for subwavelength multilayer thicknesses due to multibeam interference features in the nanoresonator, and they can be amplified when the main layer and (or) the whole system thicknesses decrease. The investigated transmission features take place under variations of the system parameters such as anisotropy of the main layer materials, non-ideal realization of ENZ materials, oblique incidence of the exciting radiation (for small incidence angles). The obtained results can have applications in development of ultra-thin nanophotonics devices using phase transformation of transmitted waves.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57823257","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}
{"title":"Inverse design of EBG waveguides through scattering matrices","authors":"R. Palmeri, T. Isernia","doi":"10.1051/EPJAM/2020009","DOIUrl":"https://doi.org/10.1051/EPJAM/2020009","url":null,"abstract":"Inverse design procedures aim at determining optimal parameters for a given device in order to satisfy assigned specifications. In this contribution, the design of optimal EBG waveguides through inverse problems tools is addressed. In particular, an inversion tool based on the so called ‘scattering matrices’ is proposed and assessed to optimize the guiding effect for straight and bent waveguides.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57823145","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}
Ke Chen, Xin-Yao Luo, Guowen Ding, Junming Zhao, Yijun Feng, T. Jiang
{"title":"Broadband microwave metamaterial absorber with lumped resistor loading","authors":"Ke Chen, Xin-Yao Luo, Guowen Ding, Junming Zhao, Yijun Feng, T. Jiang","doi":"10.1051/EPJAM/2018011","DOIUrl":"https://doi.org/10.1051/EPJAM/2018011","url":null,"abstract":"Narrow absorption bandwidth has been a fundamental drawback hindering many metamaterial absorbers for practical applications. In this paper, by loading lumped resistors, we have successfully designed a microwave metamaterial absorber with multioctave wide absorption bandwidth covering the entire X- and Ku-bands, while keeping the thickness of the absorber less than 1/10 of the working wavelength. The polarization-insensitive absorber shows a good angular stability for both transverse electric (TE) and transverse magnetic (TM) incidences. Prototype has been fabricated and measured to validate the design principle and the simulated results, and good agreements are observed between simulated and measured results. The proposed metamaterial absorber offers an efficient way to realize broadband microwave absorption with stable angular performance, which may find potential uses in many applications, for example, electromagnetic compatibility.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/EPJAM/2018011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48181404","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}
{"title":"Quasi-theoretical investigation of four circularly polarized metaloop antennas","authors":"H. Nakano, T. Abe, J. Yamauchi","doi":"10.1051/EPJAM/2018007","DOIUrl":"https://doi.org/10.1051/EPJAM/2018007","url":null,"abstract":"Four metamaterial line loop (metaloop) antennas, RND-MTLP-C, RND-MTLP-N, SQR-MTLP-C, and SQR-MTLP-N are investigated to clarify the antenna characteristics. Each metaloop is made up of either a C-type metamaterial line or an N-type metamaterial line, where the dispersion characteristics of the unit cell for the C- and N-type metamaterial lines are designed to be as similar as possible. The RND-MTLP-C and SQR-MTLP-C act as a dual-band counter circularly polarized antenna across a fast wave frequency region. It is found that, depending on the deviation factor, the SQR-MTLP-N behaves as a tri-band circularly polarized antenna, but the RND-MTLP-N does not have the tri-band characteristic. The radiation pattern, gain, and input characteristic in terms of the VSWR for the four antennas are clarified.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/EPJAM/2018007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42812489","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}
{"title":"Broadband transmission-line illusions based on transformation electromagnetic","authors":"T. Nagayama, A. Sanada","doi":"10.1051/epjam/2019018","DOIUrl":"https://doi.org/10.1051/epjam/2019018","url":null,"abstract":"We demonstrate broadband transmission-line illusions based on transformation electromagnetics at microwave frequencies by using the distributed full-tensor anisotropic medium. Due to an intrinsic nature of the non-resonant unit cell of the medium, the illusions operate from DC to an upper limit frequency where the homogeneous medium approximation holds. Two-dimensional groove and bump illusion media mimicking scattered waves by an original groove and a bump are designed. Their broadband and incident angle independent operations are confirmed by circuit simulations. The groove illusion medium is implemented on a dielectric substrate with microstrip-line technology, and it is confirmed experimentally by near-field measurements that the illusion medium well mimics scattered waves by the original groove in the broadband frequency range from 2.60 GHz to 4.65 GHz.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/epjam/2019018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42223384","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}
B. Ungureanu, S. Guenneau, Y. Achaoui, A. Diatta, M. Farhat, H. Hutridurga, R. Craster, S. Enoch, S. Brûlé
{"title":"The influence of building interactions on seismic and elastic body waves","authors":"B. Ungureanu, S. Guenneau, Y. Achaoui, A. Diatta, M. Farhat, H. Hutridurga, R. Craster, S. Enoch, S. Brûlé","doi":"10.1051/epjam/2019015","DOIUrl":"https://doi.org/10.1051/epjam/2019015","url":null,"abstract":"We outline some recent research advances on the control of elastic waves in thin and thick plates, that have occurred since the large scale experiment [S. Brûlé, Phys. Rev. Lett. 112, 133901 (2014)] that demonstrated significant interaction of surface seismic waves with holes structuring sedimentary soils at the meter scale. We further investigate the seismic wave trajectories of compressional body waves in soils structured with buildings. A significant substitution of soils by inclusions, acting as foundations, raises the question of the effective dynamic properties of these structured soils. Buildings, in the case of perfect elastic conditions for both soil and buildings, are shown to interact and strongly influence elastic body waves; such site-city seismic interactions were pointed out in [Guéguen et al., Bull. Seismol. Soc. Am. 92, 794–811 (2002)], and we investigate a variety of scenarios to illustrate the variety of behaviours possible.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/epjam/2019015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45638609","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}
{"title":"Some aspects of mass-energy equivalence which appears in left-handed metamaterials","authors":"N. Gasimov, M. Karaaslan, C. Sabah, F. Karadağ","doi":"10.1051/EPJAM/2019013","DOIUrl":"https://doi.org/10.1051/EPJAM/2019013","url":null,"abstract":"In this work, the concept of mass-energy equivalence in left-handed metamaterials is discussed by following Einstein's box thought experiment. Left-handed metamaterials are artificial composite structures that exhibit unusual properties, especially negative refractive index, in which phase and group velocities are directed oppositely. Equation E = mc2 assumes that, in vacuum, the propagation of an electromagnetic radiation from emitter to receiver is accompanied by the transfer of mass. It was hypothesized previously that if the space between emitter and receiver is medium with a negative refractive index, then radiation transfers the mass not from the emitter to receiver as expected, but rather from the receiver to the emitter due to the opposite directions of phase and group velocities. In this paper, it is shown that even though one radiating atom is taken, the negative mass transferring must be in force. In particular, it means that, if the atom radiates a photon in a medium with negative refractive index, photon transfers the mass not from the atom, but to the atom.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/EPJAM/2019013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47638908","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}
O. Dahlberg, F. Ghasemifard, G. Valério, O. Quevedo–Teruel
{"title":"Propagation characteristics of periodic structures possessing twist and polar glide symmetries","authors":"O. Dahlberg, F. Ghasemifard, G. Valério, O. Quevedo–Teruel","doi":"10.1051/EPJAM/2019012","DOIUrl":"https://doi.org/10.1051/EPJAM/2019012","url":null,"abstract":"In this article, we provide an overview of the current state of the research in the area of twist symmetry. This symmetry is obtained by introducing multiple periods into the unit cell of a periodic structure through a rotation of consecutive periodic deformations around a symmetry axis. Attractive properties such as significantly reduced frequency dispersion and increased optical density, compared to purely periodic structures, are observed. The direct link between the symmetry order and these properties is illustrated through numerical simulations. Moreover, polar glide symmetry is introduced, and is shown to provide even further control of the dispersion properties of periodic structures, especially when combined with twist symmetry. Twist symmetries can, with benefit, be employed in the development of devices for future communication networks and space applications, where fully metallic structures with accurate control of the dispersion properties are desired.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/EPJAM/2019012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44979171","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}
{"title":"Singular graphene metasurfaces","authors":"E. Galiffi, J. Pendry, P. Huidobro","doi":"10.1051/EPJAM/2019005","DOIUrl":"https://doi.org/10.1051/EPJAM/2019005","url":null,"abstract":"The spatial tunability of the electron density in graphene enables the dynamic engineering of metasurfaces in the form of conductivity gratings, which can bridge the momentum gap between incident radiation and surface plasmons. Here, we discuss singular graphene metasurfaces, whose conductivity is strongly suppressed at the grating valleys. By analytically characterising their plasmonic response via transformation optics, we first review the physical principles underlying these structures, which were recently found to exhibit broadband, tunable THz absorption. We characterise the spectrum with different common substrates and then move to study in further detail how conductivity gratings may be finely tuned by placing an array of charged gold nanowires at sub-micron distance from the graphene.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/EPJAM/2019005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44393509","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}
{"title":"Recent progress in angle-insensitive narrowband and broadband metamaterial absorbers","authors":"Saptarshi Ghosh, T. T. Nguyen, Sungjoon Lim","doi":"10.1051/EPJAM/2019010","DOIUrl":"https://doi.org/10.1051/EPJAM/2019010","url":null,"abstract":"Recent progress in angle-insensitive narrowband and broadband metamaterial absorbers is presented herein. Initially, a few narrowband structures are described along with their absorption mechanisms. A bandwidth-enhanced absorber, conceptually derived from the existing narrowband geometry, is also discussed. Finally, several broadband absorbers having wide absorption bandwidths across different microwave frequency ranges are illustrated. The reported structures are primarily designed to exhibit high angularly stable responses suitable for practical applications. Furthermore, their geometries are fourfold symmetric, thereby displaying polarization-independent characteristics. Experimental verifications of the designed absorbers have been confirmed under normal and oblique incidences. The angle insensitivity, polarization independence, flexible absorption bandwidths (from narrowband to broadband), and commercial feasibility of the reported structures might establish them as potential candidates for manifold absorber applications.","PeriodicalId":43689,"journal":{"name":"EPJ Applied Metamaterials","volume":null,"pages":null},"PeriodicalIF":1.6,"publicationDate":"2019-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1051/EPJAM/2019010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47631707","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}