Polarization‐independent multiband metamaterials absorber by fundamental cavity mode of multilayer microstructure
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Abstract We propose a multiband metamaterial absorber consisting of silicon brick array on metal substrate in infrared range. Using the regular hexagon array of silicon bricks, the absorption rate can reach to 90% over the bandwidth of 100 nm, and four absorption peaks with the absorption rate of more than 98% can be obtained. The absorber is independent on polarization angle. The multiband absorption performance can be attributed to primary cavity mode and Mie resonance in silicon bricks. Importantly, when the all‐dielectric silicon bricks are replaced by metal‐dielectric‐metal sandwich structure, the absorption rate above 75% with the bandwidth of more than 200 nm in the absorber can be realized, and it is polarization‐insensitive. The absorption peaks are increased to obtain broadband absorption. Our designed sandwich microstructure can generate the resonance effect of magnetic dipole among coupled layers, leading to the characteristics of broadband absorption.Metamaterial is a novel type of artificial electromagnetic material,and the absorbers made from metamaterial is small,light and can achieve near-unity absorption.The operational frequency of a absorber made from a given kind of metamaterial lies on its geometrical structure and can be geometrically scalable to other regimes of the electromagnetic spectra.In this paper,the work principle of the metamaterial absorber is introduced firstly,then its design method is presented.Lastly,the research status of THz band metamaterial absober are summarized.
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Metamaterials are artificial structures that are designed to exhibit specific electromagnetic properties required for different applications but not commonly found in nature.The methodology of synthesizing materials composed of micro-and nano-structured components that mimic the electromagnetic response of individual atoms and molecules (meta-atoms and meta-molecules) has proven to be very productive and resulted in the development of metamaterials exhibiting strong magnetic response at microwave and optical frequencies and so-called left-handed metamaterials (LHMs) (both impossible in conventional real-world materials).LHMs are designed to exhibit simultaneously negative permittivity and permeability (Veselago, 1968;Engheta & Ziolkowski, 2006).In 2000, Smith et al. developed the first experimental left-handed structure, which was composed of metallic split-ring resonators and thin metal wires (Smith et. al., 2000;Shelby et. al., 2001).An alternative transmission line approach for left-handed materials was proposed, almost simultaneously, by several different groups (Belyantsev & Kozyrev, 2002; Caloz & Itoh, 2002;Iyer & Eleftheriades, 2002).This approach, based on nonresonant components, allows for low-loss left-handed structures with broad bandwidth.The unique electrodynamic properties of these materials, first postulated by Veselago in 1968, include the reversal of Snell's law, the Doppler effect, Vavilov-Cherenkov radiation, and negative refractive index, making theses materials attractive for new types of RF and microwave components.The range of applications for LHMs is extensive, and opportunities abound for development of new and powerful imaging and communication techniques.The most tantalizing of these potential applications is the possibility of realizing "perfect" (diffraction-free) lenses based on their inherent negative index of refraction (Pendry, 2000).The slab of LHM can act as an ideal (diffractionfree) lens and thus capable of producing images of objects without any loss of information which is impossible with conventional lenses.Most studies of LHMs have been concerned with linear wave propagation, and have inspired many applications that were unthinkable in the past (Engheta & Ziolkowski, 2006;
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Metamaterials, artificial composite structures with exotic material properties, have emerged as a new frontier of science involving physics, material science, engineering and chemistry. This critical review focuses on the fundamentals, recent progresses and future directions in the research of electromagnetic metamaterials. An introduction to metamaterials followed by a detailed elaboration on how to design unprecedented electromagnetic properties of metamaterials is presented. A number of intriguing phenomena and applications associated with metamaterials are discussed, including negative refraction, sub-diffraction-limited imaging, strong optical activities in chiral metamaterials, interaction of meta-atoms and transformation optics. Finally, we offer an outlook on future directions of metamaterials research including but not limited to three-dimensional optical metamaterials, nonlinear metamaterials and "quantum" perspectives of metamaterials (142 references).
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A subwavelength water metamaterial is proposed and analyzed for ultra-broadband perfect absorption at microwave frequencies. We experimentally demonstrate that this metamaterial shows over 90% absorption within almost the entire frequency band of 12-29.6 GHz. It is also shown that the proposed metamaterial exhibits a good thermal stability with its absorption performance almost unchanged for the temperature range from 0 to 100°C. The study of the angular tolerance of the metamaterial absorber shows its ability of working at wide angles of incidence. Given that the proposed water metamaterial absorber is low-cost and easy for manufacture, we envision it may find numerous applications in electromagnetics such as broadband scattering reduction and electromagnetic energy harvesting.
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We present two recent advances in the area of electromagnetic metamaterials. The first is the development of 2D transmission-line (TL) based metamaterials with arbitrary tensorial effective material parameters. These new metamaterials are distinct from earlier TL metamaterials which were limited to having effective material parameters that are diagonal in the Cartesian basis. The second advance is the development of a 3D isotropic negative refractive index metamaterial. The volumetric metamaterial exhibits an isotropic response for all polarizations and angles of incidence.
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This book will cover the recent advances and applications in metamaterials. It begins by presenting the fundamental concepts of metamaterials, including characterization. The book then moves on to discuss microwave metamaterial sensors, metamaterial absorbers in microwave range, metamaterial absorbers in high frequencies, energy harvesting application of metamaterials, seismic metamaterial, artificial intelligence applications in metamaterial antennas, frequency selective surfaces in metamaterials, metasurfaces, and biomedical applications of metamaterials. In all sections, the design procedure of artificial materials and the evaluation of constitutive parameters and related parameters including how they affect results, will be explained. Novel worked examples will be carried out in each chapter. Key features • Presents an extensive guide for the common applications of metamaterials. • Explains key points in the design and analysis of metamaterials. • Includes comprehensive examples of metamaterial applications. • Provides case studies, worked examples, end of chapter summaries.
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This chapter contains sections titled: Introduction Metamaterials Background RF LC Metamaterials RF Tunable "Meta-Surfaces" with LCs LC Tuning of Meta-Atoms Optical Metamaterials with LCs LC Interaction with Plasmonic Metamaterial Structures Liquid Crystals in Self-Assembled Metamaterials Chiral Metamaterials Conclusion Outlook References
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Metamaterial with superior physical properties is a new type of artificial electromagnetic material.Absorbing material is used widely on stealth weapons of aircraft, missiles, ships, tanks and other more extensive application.the improvement in performance of the metamaterial absorbing body can design new unit structure, design and research the optimized algorithm, use new materials and hybrid materials, explore and combine with new concept, etc. Firstly introduces the working principle of absorbing material and the research progress of absorbing materials and terahertz metamaterials.Finally, the research status of the metamaterial absorber is summarized at the domestic and foreign.
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Abstract This paper presents the design and characterization of a novel metamaterial with five distinct operating bands for THz applications. The proposed metamaterial is constructed using an ultra‐thin polyimide substrate. The proposed metamaterial has a square geometry with metallic patterns suitably designed to obtain the desired frequency characteristics. The metamaterial operates based on surface plasmon hybridization with stopband characteristics at 0.82, 1.96, 2.77, 3.40 and 4.74 THz. The metamaterial has a small geometry 0.082 λ o × 0.082 λ o where λ o is wavelength calculated under free‐space conditions at 0.82 THz. The operation of the proposed pentaband metamaterial is described using electric field distributions. The metamaterial reported in this paper has rotational symmetry and hence it is polarization independent. The performance of the metamaterial for various angles of incidence has been evaluated and the results reveal that the proposed metamaterial is stable up to ±70 degrees. The THz metamaterial is appropriate for components like frequency selective surface, sensors and detectors.
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