首页 > 最新文献

EPJ Applied Metamaterials最新文献

英文 中文
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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/EPJAM/2020011
Jiameng Nan, Ruisheng Yang, Jing Xu, Quanhong Fu, Fuli Zhang, Yuancheng Fan
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.
在这里,我们提出了电磁波通过含有石墨烯的混合超表面的主动调制传输。这种混合超表面由具有非凡透射性的图案金属层组成,背面是石墨烯夹层层。通过设计穿孔结构的金属层,我们证明了通过将偏置电压从0增加到4 V来电调谐费米能级和石墨烯夹层结构的片电阻,可以有效地调制非共振传输幅度。我们还发现,适当设计穿孔金属结构可以进一步提高调制深度。通过将几何结构从断线结构改为“蝴蝶”形状,初步实现了对非谐振传输调制的19.2%的改进。在拟合石墨烯片电阻的情况下,活性超表面的透射率测量结果与数值模拟结果吻合较好。在这项工作中提出的混合超表面可以部署在基于有源电磁或光调制的广泛应用中。
{"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":"1 1","pages":""},"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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020006
Y. M. Wu, Guo Q. Chen, W. Wu, Y. X. Wang, Y. Huang
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.
采用自洽平均场近似方法研究了由非线性核心涂层圆柱体和梯度德鲁德壳组成的非线性复合材料的本征光学双稳性。在准静态极限下,导出了这种梯度复合材料的非线性近场方程。我们证明了双稳阈值和双稳宽度高度依赖于芯半径、入射频率和涂层圆柱体夹杂的梯度系数。研究发现,只有当光芯半径和入射频率满足一定条件时,才会出现光双稳性。因此,非线性复合材料的光学双稳性可以通过适当调整物理和几何参数来优化。研究结果对设计具有适当双稳性的非线性器件具有一定的指导意义。
{"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":"1 1","pages":""},"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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020008
P. Bora, Utpal J. Mahanta, J. K. Sarmah, J. P. Gogoi
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.
利用Hummer方法获得的氧化石墨烯,采用化学和热处理方法合成还原性氧化石墨烯(RGO)。研究了rgo -碳化硅(SiC)-低密度聚乙烯(LLDPE)柔性复合材料在x波段的复合介电常数和磁导率。在开发的衬底和标准的FR4衬底上设计了环形四条纹结构的超材料设计,并利用CST Microwave Studio的EM模拟器进行了仿真。模拟结果表明,FR4衬底的谐振峰值频率从c波段转移到x波段,这表明介电间隔层的微波本构特性起了作用。在厚度为0.7 mm的RGO-SiC-LLDPE复合材料上制备的超材料结构在10.7 GHz下的吸光度为S11 ~−25 dB,最大吸光度为96.7%。因此,所开发的超材料设计在微波应用中具有潜在的应用前景。
{"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":"1 1","pages":""},"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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020004
Zhilong Li, Yajie Mu, Jiaqi Han, Xiaohe Gao, Long Li
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.
提出了一种用于5G通信应用的电下倾双极化基站天线阵列(BSAA)设计,该天线阵列通过集成可重构反射超表面和部分反射表面(PRS)来实现。通过控制插入反射元件的变容二极管,可以调节BSAA的主瓣方向。此外,利用阵列上的PRS构造了具有反射超表面和地平面的Fabry-Perot (FP)腔。基于这种设计方法,设计并制作了一个工作频率为3.4 GHz ~ 3.6 GHz的1 × 6双极化BSAA。仿真和实测结果表明,在旁瓣电平(SLL)小于- 20 dB的情况下,PRS可使增益提高约2.56 dB。天线阵的主瓣可以在波束向下倾斜±5°范围内精确调节。交叉极化鉴别(XPD)小于−40 dB。
{"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":"1 1","pages":""},"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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020007
Lei Zhang, J. Dai, M. Moccia, G. Castaldi, T. Cui, V. Galdi
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.
在时空元结构的总体框架内,基于时空编码的数字元表面正在成为复杂场操作的强大和通用架构,也考虑到它们固有的可编程性质。在这里,我们提供了一个紧凑的调查,我们最近的结果和正在进行的研究在这个研究领域。场操纵的例子包括谐波光束操纵和/或整形以及可编程的非互反效应。可能的应用范围很广,从无线通信到雷达和成像。
{"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":"1 1","pages":""},"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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/EPJAM/2020010
E. Martini, F. Caminita, S. Maci
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.
本文研究了均匀化阻抗模型用于描述在接地介质板上印刷亚波长贴片实现的周期调制超表面(mts)的准确性。这个问题与基于表面波的MTS天线有关。均匀化模型是基于基于微周期性假设(即具有亚波长周期)的亚波长贴片单元的局部阻抗合成;均匀化阻抗依次用于宏观周期调制问题;这是一个周期均质化问题,其周期包含若干微周期。比较了两种不同的均质阻抗模型。第一个模型基于各向异性的“不可穿透”阻抗,由MTS-air界面的边界条件(BCs)定义,而第二个模型使用“可穿透”阻抗片,描述由接地金属板上的金属包层施加的均匀BCs。尽管两种模型都考虑了接地板的存在,但当采用均质阻抗来描述宏观调制时,它们给出了不同的结果。通过与全波分析的比较表明,两种均质化模型都能提供一致的结果,但穿透阻抗模型在复杂传播常数和电流分布的预测上更为准确。这是由于它能够正确地解释MTS的空间色散。
{"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":"122 1","pages":""},"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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020005
Y. Takano, A. Sanada
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.
我们演示了模拟角反射器的角隐身操作,并在截断的角中隐藏对象。该角斗篷的设计频率为18.25 GHz,通过在底部斜边上堆叠非谐振人造介电片来实现。近场测量结果表明,斗篷的实测场分布与角反射镜原始区域的场分布以及数值预测的场分布吻合较好。由实测场分布计算得到的隐身物的双基地雷达截面(brcs)与原面积吻合,定量地确定了隐身物的工作状态。由brcs的镜面散射角评估的带宽显示宽带工作范围为16至22 GHz。
{"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":"1 1","pages":""},"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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020003
Zhaomei Liu, Xingxing Han, Aixia Wang
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.
本文提出了一种超薄、极化不敏感的太赫兹完美超材料吸收体(PMA),其结构采用传统的夹层结构,顶层为圆形贴片谐振器。模拟光谱结果表明,该PMA在f1 = 0.8 THz、f2 = 2.28 THz和f3 = 3.62 THz处有三个不同的吸收峰,吸光度分别为96.7%、97.9%和99.8%。PMA的电场分布表明,吸收主要来自于顶层和底层之间的驻波共振。由于其轴对称的单胞结构,所提出的PMA对极化不敏感。通过调整结构参数,可以有效地调节吸收峰的共振频率、强度和q因子。我们的设计可能会在太赫兹成像、传感和信号检测中找到潜在的应用。
{"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":"1 1","pages":""},"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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/epjam/2020002
Jialin Feng, Hongyu Shi, A. Zhang, Zhuo Xu
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.
提出了两种基于石墨烯的可调谐编码超表面,用于太赫兹波段的波束控制。编码超表面由具有三明治状结构的单元胞组成,其中包含各向异性矩形石墨烯结构的顶层、中间介电层和接地面。由于石墨烯的化学势改变了单元电池的特性,因此所设计的超表面可以动态调整。当石墨烯的弛豫时间为0.8 ps,化学势为0.85 eV时。编码元表面可以实现1.30太赫兹-1.70太赫兹的波束控制。另一方面,当石墨烯的化学势为0 eV时,两个超表面在该波段内没有光束导向。所设计的基于石墨烯的可调谐编码超表面在太赫兹通信、传感等领域具有潜在的应用价值。
{"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":"1 1","pages":""},"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 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2020-01-01 DOI: 10.1051/EPJAM/2020015
G. Palermo, K. V. Sreekanth, G. Strangi
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.
近年来,人工材料逆设计在纳米生物光子领域的应用引起了广泛的关注。特别是,人造双曲色散纳米材料的极端光学性质允许获得新的物理效应和机制。双曲超材料和超表面的非束缚等频表面允许获得几乎无限的光子密度态、超高的电磁场约束和异常波传播。在这里,我们报告了不同双曲色散材料几何形状的最相关物理特性,以及它们如何允许在单纳米尺度上控制生物物质中的光-物质相互作用。
{"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":"1 1","pages":""},"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
期刊
EPJ Applied Metamaterials
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1