共查询到20条相似文献,搜索用时 33 毫秒
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超常材料是具有自然材料所不具备的超常物理性质的一类人工电磁材料。由于本身具有损耗大、工作带宽窄等缺点严重限制了其应用研究,尤其是在太赫兹和光波频段。在金属微结构单元结合某种非线性材料(半导体、量子结、量子阱等)构成复合型超常材料,或者改变超常材料的外部激励(如温度、光激励、电磁场等)可以控制其整体特性,实现抵消材料损耗、调控它对电磁波的响应强度和频谱范围。本论文总结了有源超常材料在各频段的研究进展及应用。 相似文献
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太赫兹超常材料及应用 总被引:1,自引:0,他引:1
超常材料具有人工设计的结构,并有自然材料所不具备的超常物理性质。超常材料的电磁响应灵活可调,对太赫兹(THz)技术意义非凡。THz超常材料的实现和迅速发展为太赫兹技术的发展和应用带来了新的机遇。总结了THz波段超常材料的研究进展,包括THz波段超常材料的构造及制备、基于超常材料的THz波器件以及超常材料在THz波技术中的其他应用。 相似文献
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太赫兹波段电磁超介质的应用及研究进展 总被引:1,自引:0,他引:1
太赫兹波和电磁超介质是电磁学领域关注的热点.太赫兹波与电磁超介质相互作用可以实现对太赫兹波的操纵和调控,有望填补"太赫兹空白".介绍了太赫兹波段电磁超介质的研究进展,包括电磁超介质电磁性能可调谐的实施途径,电磁超介质在太赫兹功能器件方面的应用(调制器/开关、传感器/探测器、滤波器、偏振元件和吸波器),太赫兹波段表面等离... 相似文献
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Dorota A. Pawlak Sebastian Turczynski Marcin Gajc Katarzyna Kolodziejak Ryszard Diduszko Krzysztof Rozniatowski Julita Smalc Irina Vendik 《Advanced functional materials》2010,20(7):1116-1124
Metamaterials offer new unusual electromagnetic properties, which have already been demonstrated, and many postulated new functionalities are yet to be realized. Currently, however, metamaterials are mostly limited by narrow band behavior, high losses, and limitation in making genuinely 3D materials. In order to overcome these problems an overlap between metamaterial concepts and materials science is necessary. Engineered self‐organization is presented as a future approach to metamaterial manufacturing. Using directional solidification of eutectics, the first experimental realization of self‐organized particles with a split‐ring resonator‐like cross section is demonstrated. This unusual morphology/microstructure of the eutectic composite has a fractal character. With the use of TEM and XRD the clear influence of the atomic crystal arrangement on the microstructure geometry is presented. The materials obtained present very high anisotropy and can be obtained in large pieces. Metallodielectric structures can be created by etching and filling the space with metal. The next steps in the development of self‐organized materials exhibiting unusual properties are discussed. 相似文献
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设计了一种超材料三维模型,由闭合方环和4个开口谐振方环通过正、反向双开口方环与闭合方环相互耦合来组成,在太赫兹范围内具有多波段电磁诱导透明(EIT)效应。该结构分别实现了在1.21、1.46、1.61、1.98 THz这四波段的电磁诱导透明现象,并且谐振强度均达到0.9左右。通过将结构单元进行拆分并相互对比分析,研究了该超材料结构产生多波段EIT效应的物理机理,并重点分析了开口大小、闭合方环尺寸对EIT强度与带宽的影响。通过对三维立体结构仿真分析可知,所设计的超材料不仅在多个波段获得了较高的折射率灵敏度,还具有高强度、多频点的慢光效应。因此,其在折射率传感与光缓存器件等领域,具有良好的应用前景。 相似文献
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《Antennas and Propagation, IEEE Transactions on》2008,56(9):2963-2969
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能信协同超材料(Collaborative Power and Information Metamaterials, CPIM)是将电磁超材料与无线能量传输(Wireless Power Transfer, WPT)、无线能量收集(Wireless Energy Harvesting, WEH)和无线信息传输(Wireless Information Transfer, WIT)有机融合的前沿领域,旨在实现能量与信息的高效协同传输和控制。CPIM器件凭借其灵活调控电磁波的能力和低成本、低能耗、低重量的优点可以有效解决大量低功耗设备的供能问题,同时保证高质量的通信传输。将能量与信息的多重功能融合于可操控的超材料器件中,以实现更紧凑、高效的能信协同传输效应。针对CPIM的工作基本原理和广泛实用性的应用场景,文章围绕WPT、WEH、WIT三大核心部分进行深入讨论和分析,并阐述了CPIM器件的工作原理和设计方法。最后给出了CPIM在未来的潜在研究和应用方向。文章旨在为研究人员提供基于超材料的能信协同传输技术的趋势和应用分析,推动无线通信和能源系统向更高效、智能化的方向发展。 相似文献
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Metamaterials are man‐made materials which get their properties from their structure rather than their chemical composition. Their mesostructure is specifically designed to create functionalities not found in nature. However, despite the broad variety of metamaterials developed in recent years, a straightforward procedure to design these complex materials with tailored properties has not yet been established. Here, the inverse design problem is tackled by introducing a general optimization tool to explore the range of material properties that can be achieved. Specifically, a stochastic optimization algorithm is applied and its applicability to disjoint problems is demonstrated, with a focus on tuning the buckling properties of mechanical metamaterials, including experimental verification of the predictions. Besides this problem, this algorithm can be applied to a large variety of systems that, because of their complexity, would be challenging otherwise. Potential applications range from the design of optomechanical resonators, acoustic band gap materials, to dielectric metasurfaces. 相似文献
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K.Sumathi Lavadiya Sunil Yin PengZhi Parmar Juveriya Patel Shobhit K. 《Wireless Networks》2021,27(3):2131-2146
Wireless Networks - We present a metamaterial superstrate based microstrip patch antenna with PIN diode switches applicable for wireless network applications. Metamaterials in the form of square... 相似文献
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V. N. Kisel’ A. N. Lagar’kov 《Journal of Communications Technology and Electronics》2009,54(5):506-514
Results of studies in the theory and applications of thin-layer metamaterials are presented. The studies involve modeling and realization of superresolution devices. It is found that rigorous electrodynamic models that are not based on homogenization of composites should be preferred in modeling devices with metamaterials. Differences between a real composite and a hypothetic homogeneous metasubstance are revealed. The conclusion that loss in a metamaterial can be compensated with the help of active insertions is drawn. The directions of further research are indicated. 相似文献
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A metamaterial terahertz modulator based on complementary planar double-split-ring resonator 总被引:1,自引:0,他引:1
A metamaterial based on complementary planar double-split-ring resonator (DSRR) structure is presented and demonstrated, which can optically tune the transmission of the terahertz (THz) wave. Unlike the traditional DSRR metamaterials, the DSRR discussed in this paper consists of two split rings connected by two bridges. Numerical simulations with the finite-difference time-domain (FDTD) method reveal that the transmission spectra of the original and the complementary metamaterials are both in good agreement with Babinet’s principle. Then by increasing the carrier density of the intrinsic GaAs substrate, the magnetic response of the complementary special DSRR metamaterial can be weakened or even turned off. This metamaterial structure is promised to be a narrow-band THz modulator with response time of several nanoseconds. 相似文献
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S. Jagan Mohan Rao Deepak Kumar Gagan Kumar Dibakar Roy Chowdhury 《Journal of Infrared, Millimeter and Terahertz Waves》2017,38(1):124-134
We present the effect of vertical displacements between the resonators inside the unit cell of planar coupled metamaterials on their near field coupling and hence on the terahertz (THz) wave modulation. The metamolecule design consists of two planar split- ring resonators (SRRs) in a unit cell which are coupled through their near fields. The numerically simulated transmission spectrum is found to have split resonances due to the resonance mode hybridization effect. With the increase in displacement between the near field coupled SRRs, this metamaterial system shows a transition from coupled to uncoupled state through merging of the split resonances to the single intrinsic resonance. We have used a semi-analytical model describing the effect of displacements between the resonators and determine that it can predict the numerically simulated results. The outcome could be useful in modulating the terahertz waves employing near field coupled metamaterials, hence, can be useful in the development of terahertz modulators and frequency tunable devices in future. 相似文献
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Rong Guo Siyu Duan Ze He Xuelian Liang Zihan Niu Ming He Yushun Jiang Jingbo Wu Lu Ji Biaobing Jin Jian Chen Huabing Wang Peiheng Wu 《Advanced functional materials》2021,31(52):2106891
The Josephson plasmon resonance (JPR) offers a valuable probe to investigate the superconductivity in layered cuprate superconductors. However, the coupling between free space radiation and JPR in high-temperature superconductor (HTS) film remains challenging because the excitation of JPR demands the c-axis oriented electric field. The subwavelength resonators in metamaterials can enhance the localized electric field, which can be utilized to resolve this difficulty. Here, a tunable terahertz (THz) metamaterial made from Tl2Ba2CaCu2O8 (Tl-2212) HTS film is developed. The spectral response of Tl-2212 metamaterial has a tunable property at temperatures up to 90 K. The resonant excitation of Josephson plasmon in the metamaterial is observed. Simulation results indicate that the scattering of subwavelength resonators can provide the component of the z-axis electric field for the resonant excitation. The coupling between JPR and resonance modes of metamaterials is observed and explained using coupled mode theory. The temperature dependence of JPR frequency shows accordance with the experimental results of the pure film. This work provides an avenue to excite the JPR and probe superconducting condensate in the layered superconductor. The development of Josephson plasmonic metamaterials may contribute to tunable and nonlinear THz devices. 相似文献
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可调带通滤波器是物联网、卫星通信、智能天线等系统中不可缺少的关键器件之一。针对目前对可调带通滤波器小型化、低成本和高集成度等特点的应用需求,提出了一种基于液晶材料的可调带通滤波器设计方法。通过微带传输线结构实现了近零介电常数(epsilon near zero,ENZ)超材料单元结构的设计,并利用ENZ超材料的窄通道隧穿效应有效实现了窄带滤波功能,通过将3个ENZ超材料单元结构串联从而完成了带通滤波器基本结构的设计。在此基础上,将微波液晶材料引入ENZ超材料的隧穿通道中,利用液晶材料在外部驱动电压作用下介电参数可变的特性,最终实现了对带通滤波特性的有效调控。全波数值仿真结果表明,所提出的基于ENZ超材料的液晶带通滤波器能够实现中心频率15.88~16.73 GHz的调控,从而验证了设计方法的有效性。 相似文献
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随着人工超材料对电磁诱导透明(EIT)现象的成功模拟,超材料明暗模间的耦合机制引起了广泛关注。回顾了近年来在太赫兹(THz)波段基于人工超材料的明暗模耦合效应的相关研究进展,包括平面结构EIT效应,立体结构EIT效应,明暗模垂直耦合电磁诱导吸收(EIA)效应,以及表面波非对称激发。组成超材料的单元结构内部的模式耦合机制对超材料的远场近场响应具有决定性的作用,其不同的耦合机制在光开关、慢光器件、光传感器、片上系统等的设计方面有重大的潜在应用价值。 相似文献