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Actively modulated propagation of electromagnetic wave in hybrid metasurfaces containing graphene 含石墨烯的杂化超表面中电磁波的主动调制传播
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/EPJAM/2020011
Jiameng Nan, Ruisheng Yang, Jing Xu, Quanhong Fu, Fuli Zhang, Yuancheng Fan
{"title":"Actively modulated propagation of electromagnetic wave in hybrid metasurfaces containing graphene","authors":"Jiameng Nan, Ruisheng Yang, Jing Xu, Quanhong Fu, Fuli Zhang, Yuancheng Fan","doi":"10.1051/EPJAM/2020011","DOIUrl":"https://doi.org/10.1051/EPJAM/2020011","url":null,"abstract":"Here we present the actively modulated transportation of electromagnetic wave through hybrid metasurfaces containing graphene. The hybrid metasurfaces are composed of patterned metallic layers of extraordinary transmission and backed with graphene-sandwich layers. With the designed metallic layer with perforated structure, we demonstrated effective modulation on the on-resonance transmission amplitude by increasing the bias voltage from 0 to 4 V to electrically tune the Fermi level as well as the sheet resistance of the graphene-sandwich structure. We also found that the modulation depth can be further improved by properly designing the perforated metallic structure. By change the geometry from cut-wire structure to the “butterfly”-like pattern we preliminarily achieved 19.2% improvement on the on-resonance transmission modulation. The measured transmittances of the active metasurfaces show good agreement with the numerical simulations with fitted graphene sheet resistances. The hybrid metasurfaces presented in this work may be deployed in a wide range of applications based on active electromagnetic or optical modulations.","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":"57823196","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
Optical bistability in two-dimensional nonlinear composites of coated cylinders with nonlinear core and graded shell 二维非线性复合材料的光学双稳定性
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020006
Y. M. Wu, Guo Q. Chen, W. Wu, Y. X. Wang, Y. Huang
{"title":"Optical bistability in two-dimensional nonlinear composites of coated cylinders with nonlinear core and graded shell","authors":"Y. M. Wu, Guo Q. Chen, W. Wu, Y. X. Wang, Y. Huang","doi":"10.1051/epjam/2020006","DOIUrl":"https://doi.org/10.1051/epjam/2020006","url":null,"abstract":"The intrinsic optical bistability of the nonlinear composite consisting of coated cylinders with nonlinear core and graded Drude shell is investigated with self-consistent mean-field approximation. We derive the nonlinear equation of near field for such graded composite in the quasistatic limit. We demonstrate that the bistability threshold and the bistable width are highly dependent on the core radius, the incident frequency, and the graded coefficient of the coated cylinder inclusion. It is found that the optical bistability appears only when the core radius and the incident frequency satisfy some specific conditions. Therefore, the optical bistability for nonlinear composite materials may be optimized by the suitable adjustment of the physical and geometrical parameters. Our results may be helpful for the design of the nonlinear device with appropriate bistability.","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":"57823388","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
X-band metamaterial absorbers based on reduced graphene oxide-silicon carbide-linear low density polyethylene composite 基于还原氧化石墨烯-碳化硅-线性低密度聚乙烯复合材料的x波段超材料吸收体
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020008
P. Bora, Utpal J. Mahanta, J. K. Sarmah, J. P. Gogoi
{"title":"X-band metamaterial absorbers based on reduced graphene oxide-silicon carbide-linear low density polyethylene composite","authors":"P. Bora, Utpal J. Mahanta, J. K. Sarmah, J. P. Gogoi","doi":"10.1051/epjam/2020008","DOIUrl":"https://doi.org/10.1051/epjam/2020008","url":null,"abstract":"Graphene oxide obtained by Hummer's method is used to synthesize reduced graphene oxide (RGO) using chemical and thermal treatment method. Flexible composites of RGO-Silicon carbide (SiC)-Low density polyethylene (LLDPE) in different wt.% ratios of fillers are characterized for complex permittivity and permeability in X-band. A metamaterial design of ring shaped with four stripe structure is designed on developed substrate as well as standard FR4 substrate and simulated using EM simulator, CST Microwave Studio. Simulated results showed shifting of resonant peak frequency from C-band frequency for FR4 substrate to X-band for developed substrates signifying a role of microwave constitutive properties of the dielectric spacer. The fabricated metamaterial structure on RGO-SiC-LLDPE composite of thickness 0.7 mm shows a S11 ∼ −25 dB at 10.7 GHz with maximum absorption of 96.7%. Thus, the developed meta-material design showing a potential application in microwave applications.","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":"https://sci-hub-pdf.com/10.1051/epjam/2020008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57822967","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
Dual-polarized antenna design integrated with metasurface and partially reflective surface for 5G communication 融合超表面和部分反射表面的5G通信双极化天线设计
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020004
Zhilong Li, Yajie Mu, Jiaqi Han, Xiaohe Gao, Long Li
{"title":"Dual-polarized antenna design integrated with metasurface and partially reflective surface for 5G communication","authors":"Zhilong Li, Yajie Mu, Jiaqi Han, Xiaohe Gao, Long Li","doi":"10.1051/epjam/2020004","DOIUrl":"https://doi.org/10.1051/epjam/2020004","url":null,"abstract":"A design of electrical down-tilt dual-polarized base station antenna array (BSAA) for 5G communication applications is presented in this paper, which is realized by integrating with reconfigurable reflective metasurface and partially reflective surface (PRS). By controlling the varactor diodes which are inserted into the reflective elements, we can adjust the mainlobe direction of BSAA. Moreover, the PRS over the array is utilized to construct Fabry-Perot (FP) cavity with reflective metasurface and ground plane. Based on this design approach, a 1 × 6 dual-polarized BSAA operating from 3.4 GHz to 3.6 GHz is designed and fabricated. Simulated and measured results show that the gain is enhanced about 2.56 dB by PRS while side lobe level (SLL) is less than −20 dB. The mainlobe of the antenna array can be adjusted accurately within ±5° for beam down-tilt. The cross polarization discrimination (XPD) is less than −40 dB.","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":"https://sci-hub-pdf.com/10.1051/epjam/2020004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57823332","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: 2
Recent advances and perspectives on space-time coding digital metasurfaces 时空编码数字元表面研究进展与展望
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020007
Lei Zhang, J. Dai, M. Moccia, G. Castaldi, T. Cui, V. Galdi
{"title":"Recent advances and perspectives on space-time coding digital metasurfaces","authors":"Lei Zhang, J. Dai, M. Moccia, G. Castaldi, T. Cui, V. Galdi","doi":"10.1051/epjam/2020007","DOIUrl":"https://doi.org/10.1051/epjam/2020007","url":null,"abstract":"Within the overarching framework of space-time metastructures, digital metasurfaces based on spatio-temporal coding are emerging as powerful and versatile architectures for complex field manipulations, also in view of their inherently programmable nature. Here, we provide a compact survey of our recent results and ongoing studies in this research area. Examples of field manipulations include harmonic beam steering and/or shaping and programmable nonreciprocal effects. Possible applications are abundant and range from wireless communications to radars and imaging.","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":"57823406","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: 12
Double-scale homogenized impedance models for periodically modulated metasurfaces 周期调制超表面的双尺度均质阻抗模型
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/EPJAM/2020010
E. Martini, F. Caminita, S. Maci
{"title":"Double-scale homogenized impedance models for periodically modulated metasurfaces","authors":"E. Martini, F. Caminita, S. Maci","doi":"10.1051/EPJAM/2020010","DOIUrl":"https://doi.org/10.1051/EPJAM/2020010","url":null,"abstract":"This paper investigates the accuracy of homogenized impedance models for the description of periodically modulated metasurfaces (MTSs) realized by printing subwavelength patches on a grounded dielectric slab. The problem is relevant to surface-wave based MTS antennas. The homogenized models are based on the local impedance synthesis of the subwavelength patch elements on the basis of a micro-periodicity assumption (that is, with a subwavelength period); the homogenized impedance is successively used in a macro-periodically modulated problem; that is, a periodic homogenized problem with a period which includes several micro-periods. Two different homogenized impedance models are compared. A first model is based on an anisotropic “impenetrable” impedance, defined by boundary conditions (BCs) at the MTS-air interface, while the second one uses a “penetrable” impedance sheet describing the homogenized BCs imposed by the metallic cladding on the grounded metallic slab. Although the presence of the grounded slab is considered in both models, they provide different results when the homogenized impedance is used to describe the macro-modulation. It is shown, through comparison with a full-wave analysis, that both the homogenized models can provide consistent results, but the penetrable impedance model is more accurate in the prediction of both the complex propagation constant and the current distribution. This is due to its capability to correctly account for the spatial dispersivity of the MTS.","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":"57823169","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: 6
Broadband corner cloak using a uniaxial transformation medium of stacked artificial dielectric sheets 宽带角斗篷采用单轴变换介质叠置人工介电片
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020005
Y. Takano, A. Sanada
{"title":"Broadband corner cloak using a uniaxial transformation medium of stacked artificial dielectric sheets","authors":"Y. Takano, A. Sanada","doi":"10.1051/epjam/2020005","DOIUrl":"https://doi.org/10.1051/epjam/2020005","url":null,"abstract":"We demonstrate corner cloak operations mimicking a corner reflector and hiding objects in a truncated corner. The corner cloak is designed at 18.25 GHz and implemented by nonresonant artificial dielectric sheets stacked onto the bottom hypotenuse. It is shown by the near-field measurements that the measured field distributions for the cloak agree well with those for the original area of the corner reflector as well as those for the numerical prediction. The bistatic radar cross-sections (BRCSs) for the cloak and the original area calculated from the measured field distributions coincide with each other and the cloak operation is quantitatively confirmed. The bandwidth evaluated by the specular scattering angles from the BRCSs shows broadband operation as wide as from 16 to 22 GHz.","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":"57823345","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: 2
Ultrathin polarization-insensitive tri-band THz perfect metamaterial absorber 超薄极化不敏感三波段太赫兹完美超材料吸收体
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020003
Zhaomei Liu, Xingxing Han, Aixia Wang
{"title":"Ultrathin polarization-insensitive tri-band THz perfect metamaterial absorber","authors":"Zhaomei Liu, Xingxing Han, Aixia Wang","doi":"10.1051/epjam/2020003","DOIUrl":"https://doi.org/10.1051/epjam/2020003","url":null,"abstract":"In this paper, an ultrathin and polarization-insensitive THz perfect metamaterial absorber (PMA) was proposed using the traditional sandwiched structure with circular patch resonators on the top layer. The simulated spectrum shows that the proposed PMA has three distinctive absorption peaks at f1 = 0.8 THz, f2 = 2.28 THz and f3 = 3.62 THz, with absorbance of 96.7%, 97.9% and 99.8%, respectively. The electric field distributions of the PMA reveal that the absorption mainly originates from the standing wave resonances between the top and bottom layers. The proposed PMA is polarization insensitive due to its axisymmetric unit cell structure. By adjusting the structure parameters, the resonance frequency, intensity and Q-factor of absorption peak can be tuned effectively. Our design may find potential applications in THz imaging, sensing and signal detection.","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":"https://sci-hub-pdf.com/10.1051/epjam/2020003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57823283","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
Graphene-based tunable coding metasurfaces in terahertz band 太赫兹波段基于石墨烯的可调编码超表面
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020002
Jialin Feng, Hongyu Shi, A. Zhang, Zhuo Xu
{"title":"Graphene-based tunable coding metasurfaces in terahertz band","authors":"Jialin Feng, Hongyu Shi, A. Zhang, Zhuo Xu","doi":"10.1051/epjam/2020002","DOIUrl":"https://doi.org/10.1051/epjam/2020002","url":null,"abstract":"Two graphene-based tunable coding metasurfaces are proposed for beam steering in terahertz band. The coding metasurfaces are composed of the unit cell with a sandwich-like structure, which contains the top layer of anisotropic rectangular graphene structure, intermediate dielectric layer and ground plane. The designed metasurfaces can be dynamically adjusted since the characteristics of unit cell are changed by the chemical potential of graphene. When the relaxation time and chemical potential of graphene are 0.8 ps and 0.85 eV, respectively. The coding metasurfaces could realize beam steering in 1.30 THz-1.70 THz. On the other hand, when the chemical potential of graphene is 0 eV, two metasurfaces without beam steering in this band. The designed graphene-based tunable coding metasurfaces has potential application value in the fields of terahertz communication, sensing, etc.","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":"https://sci-hub-pdf.com/10.1051/epjam/2020002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"57823272","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: 2
Hyperbolic dispersion metamaterials and metasurfaces 双曲色散超材料和超表面
IF 1.6
EPJ Applied Metamaterials Pub Date : 2020-01-01 DOI: 10.1051/EPJAM/2020015
G. Palermo, K. V. Sreekanth, G. Strangi
{"title":"Hyperbolic dispersion metamaterials and metasurfaces","authors":"G. Palermo, K. V. Sreekanth, G. Strangi","doi":"10.1051/EPJAM/2020015","DOIUrl":"https://doi.org/10.1051/EPJAM/2020015","url":null,"abstract":"In recent years a wide interest has been spurred by the inverse design of artificial materials for nano-biophotonic applications. In particular, the extreme optical properties of artificial hyperbolic dispersion nanomaterials allowed to access new physical effects and mechanisms. The unbound isofrequency surfaces of hyperbolic metamaterials and metasurfaces allow to access virtually infinite photonic density of states, ultrahigh confinement of electromagnetic fields and anomalous wave propagation. Here, we report the most relevant physical properties of different hyperbolic dispersion material geometries and how they allow to control light-matter interaction at the single nanometer scale, in biological matter.","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":"57823229","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
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