Готові списки джерел за темами / METAMATERIAL ABSORBER

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Добірка наукової літератури з теми "METAMATERIAL ABSORBER"

Автор: Grafiati

Опубліковано: 26 жовтня 2023

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Статті в журналах з теми "METAMATERIAL ABSORBER"

Tran, Van Huynh, Thanh Tung Nguyen, Xuan Khuyen Bui, Dinh Lam Vu, Son Tung Bui, and Thi Hong Hiep Le. "Experimental Verification of a TH\(\text{z}\) Multi-band Metamaterial Absorber." Communications in Physics 30, no. 4 (October 20, 2020): 311. http://dx.doi.org/10.15625/0868-3166/30/4/15081.

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Анотація:

Multi-band metamaterial absorbers have been of great interest owing to their potentials for a wide range of communicating, sensing, imaging, and energy harvesting applications. In this work, we experimentally investigate a four-band metamaterial absorber operating at THz frequencies. The metamaterials are fabricated using the maskless UV photolithography and e-beam evaporation techniques. The absorption spectra of the proposed absorber are measured using the micro-Fourier transformed infrared spectroscopy. It was demonstrated that multi-band absorption behavior originates from different individual metamaterial resonators. The thickness of the dielectric spacer plays a key role in optimizing the absorption performance, in line with the predicted results on single-band THz absorbers.

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Li, Xin, Qiushi Li, Liang Wu, Zongcheng Xu, and Jianquan Yao. "Focusing on the Development and Current Status of Metamaterial Absorber by Bibliometric Analysis." Materials 16, no. 6 (March 12, 2023): 2286. http://dx.doi.org/10.3390/ma16062286.

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In this paper, a total of 4770 effective documents about metamaterial absorbers were retrieved from the Web of Science Core Collection database. We scientifically analyzed the co-occurrence network of co-citation analysis by author, country/region, institutional, document, keywords co-occurrence, and the timeline of the clusters in the field of metamaterial absorber. Landy N. I.’s, with his cooperator et al., first experiment demonstrated a perfect metamaterial absorber microwave to absorb all incidents of radiation. From then on, a single-band absorber, dual-band absorber, triple-band absorber, multi-band absorber and broad-band absorber have been proposed and investigated widely. By integrating graphene and vanadium dioxide to the metamaterial absorber, the frequency-agile functionality can be realized. Tunable absorption will be very important in the future, especially metamaterial absorbers based on all-silicon. This paper provides a new research method to study and evaluate the performance of metamaterial absorbers. It can also help new researchers in the field of metamaterial absorbers to achieve the development of research content and to understand the recent progress.

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Neil, Thomas R., Zhiyuan Shen, Daniel Robert, Bruce W. Drinkwater, and Marc W. Holderied. "Moth wings are acoustic metamaterials." Proceedings of the National Academy of Sciences 117, no. 49 (November 23, 2020): 31134–41. http://dx.doi.org/10.1073/pnas.2014531117.

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Metamaterials assemble multiple subwavelength elements to create structures with extraordinary physical properties (1–4). Optical metamaterials are rare in nature and no natural acoustic metamaterials are known. Here, we reveal that the intricate scale layer on moth wings forms a metamaterial ultrasound absorber (peak absorption = 72% of sound intensity at 78 kHz) that is 111 times thinner than the longest absorbed wavelength. Individual scales act as resonant (5) unit cells that are linked via a shared wing membrane to form this metamaterial, and collectively they generate hard-to-attain broadband deep-subwavelength absorption. Their collective absorption exceeds the sum of their individual contributions. This sound absorber provides moth wings with acoustic camouflage (6) against echolocating bats. It combines broadband absorption of all frequencies used by bats with light and ultrathin structures that meet aerodynamic constraints on wing weight and thickness. The morphological implementation seen in this evolved acoustic metamaterial reveals enticing ways to design high-performance noise mitigation devices.

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Gu, Leilei, Hongzhan Liu, Zhongchao Wei, Ruihuan Wu, and Jianping Guo. "Optimized Design of Plasma Metamaterial Absorber Based on Machine Learning." Photonics 10, no. 8 (July 27, 2023): 874. http://dx.doi.org/10.3390/photonics10080874.

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Анотація:

Metamaterial absorbers have become a popular research direction due to their broad application prospects, such as in radar, infrared imaging, and solar cell fields. Usually, nanostructured metamaterials are associated with a large number of geometric parameters, and traditional simulation designs are time consuming. In this paper, we propose a framework for designing plasma metamaterial absorbers in both a forward prediction and inverse design composed of a primary prediction network (PPN) and an auxiliary prediction network (APN). The framework can build the relationship between the geometric parameters of metamaterials and their optical response (reflection spectra, absorption spectra) from a large number of training samples, thus solving the problem of time-consuming and case-by-case numerical simulations in traditional metamaterial design. This framework can not only improve forward prediction more accurately and efficiently but also inverse design metamaterial absorbers from a given required optical response. It was verified that it is also applicable to absorbers of different structures and materials. Our results show that it can be used in metamaterial absorbers, chiral metamaterials, metamaterial filters, and other fields.

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Yang, Guishuang, Fengping Yan, Xuemei Du, Ting Li, Wei Wang, Yuling Lv, Hong Zhou, and Yafei Hou. "Tunable broadband terahertz metamaterial absorber based on vanadium dioxide." AIP Advances 12, no. 4 (April 1, 2022): 045219. http://dx.doi.org/10.1063/5.0082295.

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Анотація:

The special electromagnetic properties of metamaterials have contributed to the development of terahertz technology, and terahertz broadband absorbers for various applications have been investigated. The design of metamaterial absorbers with tunability is in a particularly attractive position. In this work, a tunable broadband terahertz metamaterial absorber is proposed based on the phase transition material vanadium dioxide (VO2). The simulation results show that an excellent absorption bandwidth reaches 3.78 THz with the absorptivity over 90% under normal incidence. The absorptivity of the proposed structure can be dynamically tuned from 2.7% to 98.9% by changing the conductivity of VO2, which changes the structure from a perfect reflector to an absorber. An excellent amplitude modulation with the absorptivity is realized. The mechanism of broadband absorption is explored by analyzing the electric field distribution of the absorber based on impedance matching theory. In addition, it also has the advantage of polarization and incident angle insensitivity. The proposed absorber may have a wide range of promising applications in areas such as terahertz imaging, sensing, and detection.

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Li, Xiu, Chang Jun Hu, and Yang Wang. "Design of Metamaterial Absorber with Ultra-broadband and High Absorption." Journal of Physics: Conference Series 2557, no. 1 (July 1, 2023): 012077. http://dx.doi.org/10.1088/1742-6596/2557/1/012077.

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Abstract Metamaterial absorbers with perfect absorption properties are essential in various fields. A multilayer metamaterial disc absorber has been designed and analyzed using a finite-difference time-domain method. In the wavelength range from 300 nm to 3000 nm, this metamaterial absorber absorbs more than 90%. The metamaterial absorber is polarisation-insensitive due to its symmetric structure. On the other hand, the designed absorber still provides a high absorbance (>80%) at an incidence angle of 60°. Surface plasmon resonance (SPR), cavity resonance, local surface plasmon resonance (LSPR), and inter-resonance interactions dominate the absorber for efficient absorption and extended absorption bandwidth.

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Liu, Xiajun, Feng Xia, Mei Wang, Jian Liang, and Maojin Yun. "Working Mechanism and Progress of Electromagnetic Metamaterial Perfect Absorber." Photonics 10, no. 2 (February 14, 2023): 205. http://dx.doi.org/10.3390/photonics10020205.

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Анотація:

Electromagnetic metamaterials are artificial subwavelength composites with periodic structures, which can interact strongly with the incident light to achieve effective control of the light field. Metamaterial absorbers can achieve nearly 100% perfect absorption of incident light at a specific frequency, so they are widely used in sensors, optical switches, communication, and other fields. Based on the development history of metamaterials, this paper discusses the research background and significance of metamaterial perfect absorbers. Some perfect absorption mechanisms, such as impedance matching and coherent perfect absorption, are discussed. According to the functional division, the narrowband, dual frequency, multi-frequency, broadband, and tunable metamaterial perfect absorbers are briefly described.

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Peng, Mengyue, Faxiang Qin, Liping Zhou, Huijie Wei, Zihao Zhu, and Xiaopeng Shen. "Material–structure integrated design for ultra-broadband all-dielectric metamaterial absorber." Journal of Physics: Condensed Matter 34, no. 11 (December 28, 2021): 115701. http://dx.doi.org/10.1088/1361-648x/ac431e.

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Abstract Material and structure are the essential elements of all-dielectric metamaterials. Structure design for specific dielectric materials has been studied while the contribution of material and synergistic effect of material and structure have been overlooked in the past years. Herein, we propose a material–structure integrated design (MSID) methodology for all-dielectric metamaterials, increasing the degree of freedom in the metamaterial design, to comprehensively optimize microwave absorption performance and further investigate the contribution of material and structure to absorption. A dielectric metamaterial absorber with an ultra-broadband absorption from 5.3 to 18.0 GHz is realized. Theoretical calculation and numerical simulation demonstrate that the symphony of material and structure excites multiple resonance modes encompassing quarter-wavelength interference cancellation, spoof surface plasmon polariton mode, dielectric resonance mode and grating mode, which is essential to afford the desirable absorption performance. This work highlights the superiority of coupling of material and structure and provides an effective design and optimization strategy for all-dielectric metamaterial absorbers.

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Ge, Tingting, Zhijin Li, Wei Song, and Xinqing Sheng. "Design and Simulation of Photo-excited Tunable Perfect Absorber Based on Semiconductor-incorporated Metamaterial Structure." Journal of Physics: Conference Series 2219, no. 1 (April 1, 2022): 012030. http://dx.doi.org/10.1088/1742-6596/2219/1/012030.

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Abstract The perfect metamaterial absorber with sandwich structure is capable to realize nearly 100% microwave absorption. We designed and simulated a photo-excited tunable perfect absorber based on semiconductor-incorporated metamaterials using HFSS (Ansoft). This absorber composes of semiconductor Ge in designed pattern in the unit cell. Under different pump power of the incident laser light, the conductivity of Ge on the metamaterial varies. In this way, the absorption frequency of the absorber can be tuned. Simulation results showed that, under the two pump light conditions, the absorber is with maximum absorbances of over 97% in both cases. We also analyzed the loss in the absorber through numerical experiments.

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Ali, Hema Omer, and Asaad M. Al-Hindawi. "A Ultra-broadband Thin Metamaterial Absorber for Ku and K Bands Applications." Journal of Engineering 27, no. 5 (April 28, 2021): 1–16. http://dx.doi.org/10.31026/j.eng.2021.05.01.

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Анотація:

In this paper, a design of the broadband thin metamaterial absorber (MMA) is presented. Compared with the previously reported metamaterial absorbers, the proposed structure provides a wide bandwidth with a compatible overall size. The designed absorber consists of a combination of octagon disk and split octagon resonator to provide a wide bandwidth over the Ku and K bands' frequency range. Cheap FR-4 material is chosen to be a substate of the proposed absorber with 1.6 thicknesses and 6.5×6.5 overall unit cell size. CST Studio Suite was used for the simulation of the proposed absorber. The proposed absorber provides a wide absorption bandwidth of 14.4 GHz over a frequency range of 12.8-27.5 GHz with more than %90 absorptions. To analyze the proposed design, electromagnetic parameters such as permittivity permeability reflective index , and impedance were extracted and presented. The structure's working principle is analyzed and illustrated through input impedance, surface current, and the electric field of the structure. The proposed absorber compared with the recent MMA presented in the literature. The obtained results indicated that the proposed absorber has the widest bandwidth with the highest absorption value. According to these results, the proposed metamaterials absorber is a good candidate for RADAR applications.

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Більше джерел

Дисертації з теми "METAMATERIAL ABSORBER"

Liu, Xianliang. "Infrared Metamaterial Absorbers: Fundamentals and Applications." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3829.

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Thesis advisor: Willie J. Padilla
Realization of an ideal electromagnetic absorber has long been a goal of engineers and is highly desired for frequencies above the microwave regime. On the other hand, the desire to control the blackbody radiation has long been a research topic of interest for scientists--one particular theme being the construction of a selective emitter whose thermal radiation is much narrower than that of a blackbody at the same temperature. In this talk, I will present the computational and experimental work that was used to demonstrate infrared metamaterial absorbers and selective thermal emitters. Based on these work, we further demonstrate an electrically tunable infrared metamaterial absorber in the mid-infrared wavelength range. A voltage potential applied between the metallic portion of metamaterial array and the bottom ground plane layer permits adjustment of the distance between them thus altering the electromagnetic response from the array. Our device experimentally demonstrates absorption tunability of 46.2% at two operational wavelengths. Parts of this thesis are based on unpublished and published articles by me in collaboration with others. The dissertation author is the primary researcher and author in these publications. The text of chapter two, chapter five, and chapter seven is, in part, a reprint of manuscript being prepared for publication. The text of chapter three is, in part, a reprint of material as it appears in Physical review letters 104 (20), 207403. The text of chapter four is, in part, a reprint of material as it appears in Physical Review Letters 107 (4), 45901. The text of chapter six is, in part, a reprint of material as it appears in Applied Physics Letters 96, 011906
Thesis (PhD) — Boston College, 2013
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Physics

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Watts, Claire. "Metamaterials and their applications towards novel imaging technologies." Thesis, Boston College, 2015. http://hdl.handle.net/2345/bc-ir:104631.

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Анотація:

Thesis advisor: Willie J. Padilla
This thesis will describe the implementation of novel imaging applications with electromagnetic metamaterials. Metamaterials have proven to be host to a multitude of interesting physical phenomena and give rich insight electromagnetic theory. This thesis will explore not only the physical theory that give them their interesting electromagnetic properties, but also the many applications of metamaterials. There is a strong need for efficient, low cost imaging solutions, specifically in the longer wavelength regime. While this technology has often been at a standstill due to the lack of natural materials that can effectively operate at these wavelengths, metamaterials have revolutionized the creation of devices to fit these needs. Their scalability has allowed them to access regimes of the electromagnetic spectrum previously unobtainable with natural materials. Along with metamaterials, mathematical techniques can be utilized to make these imaging systems streamlined and effective. Chapter 1 gives a background not only to metamaterials, but also details several parts of general electromagnetic theory that are important for the understanding of metamaterial theory. Chapter 2 discusses one of the most ubiquitous types of metamaterials, the metamaterial absorber, examining not only its physical mechanism, but also its role in metamaterial devices. Chapter 3 gives a theoretical background of imaging at longer wavelengths, specifically single pixel imaging. Chapter 3 also discusses the theory of Compressive Sensing, a mathematical construct that has allowed sampling rates that can exceed the Nyquist Limit. Chapter 4 discusses work that utilizes photoexcitation of a semiconductor to modulate THz radiation. These physical methods were used to create a dynamic THz spatial light modulator and implemented in a single pixel imaging system in the THz regime. Chapter 5 examines active metamaterial modulation through depletion of carriers in a doped semiconductor via application of a bias voltage and its implementation into a similar single pixel imaging system. Additionally, novel techniques are used to access masks generally unobtainable by traditional single pixel imagers. Chapter 6 discusses a completely novel way to encode spatial masks in frequency, rather than time, to create a completely passive millimeter wave imager. Chapter 7 details the use of telecommunication techniques in a novel way to reduce image acquisition time and further streamline the THz single pixel imager. Finally, Chapter 8 will discuss some future outlooks and draw some conclusions from the work that has been done
Thesis (PhD) — Boston College, 2015
Submitted to: Boston College. Graduate School of Arts and Sciences
Discipline: Physics

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SAXENA, GAURAV. "DESIGN AND ANALYSIS OF MICROWAVE COMPONENTS FOR MIMO COMMUNICATION SYSTEM." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2020. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18776.

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Wireless communication demands better channel capacity with a high data rate in the modern era. To fulfill these demands, the MIMO-communication systems are developed that use manifold antennas for transmitter and receiver end. MIMO is a state-of-art technology that improves the reliability of the communication systems by utilizing the diversity technique to mitigate the multi-path fading issues, where signals may come together belligerently at the receiver. Improve spectral efficiency is achieved by the total transmitted power spreading over the antennas. Thus, MIMO can increase channel capacities as well as the reliability of the communication system without sacrificing extra transmitted power or power spectrum. Several MIMO antennas have been designed in the literature to improve their characteristics in terms of impedance bandwidth; miniaturization & isolation improvement. The MIMO-communication systems with THz range are required for high data speed in Terabit/sec (Tbps). Also, it is providing very high throughput per device (from multiple Gbps to several Tera-bps) including per area efficiency (bps/km2). It is also predicted that the world monthly traffic in smartphones will be about 40 Peta-bytes in 2021, so the demand for MIMO antennas will be increased in the future. In this thesis, various microwave components for the MIMO wireless communication system has been analyzed and designed. Three major components designed and analyzed in this thesis are 1. MIMO Antennas 2. Metamaterial Absorber 3. UWB Microwave Filter MIMO Antennas: In this thesis, various MIMO antennas for UWB, SWB, and Multiband applications have been designed. Various decoupling techniques to avoid the v interference between antenna elements are designed which enhancing the diversity parameters with improved channel capacity for modern wireless applications. To mitigate the interference between bands and to improve the reliability of the signals, a notch characteristic has been introduced. SAR analysis also discusses in this thesis with the human head and confirms that proposed MIMO antennas are in the acceptable range with 1g and 10g of bio tissues given by FCC and EU for mobile and other near field applications. All the MIMO antennas with different frequency characteristics are discussed in Chapter-2 to Chapter-6. Metamaterial Absorber: To improve the isolation level in MIMO antennas as well as to minimize the Radar Cross Section (RCS) and Electromagnetic Interference (EMI), a design of multiband metamaterial absorber (MMA) for X-band applications has been suggested. This MMA provides three high absorbance bands at 8.2GHz, 9.45GHz, and 12.45GHz with 99.4%, 96.4%, and 91.25% absorbance respectively. Proposed MMA is polarization insensitive in all three bands with minimum RCS -33.2dBm2. This absorber structure has designed on FR-4 (4.4) substrate having tanδ = 0.02 with unit cell dimension 20×20×1mm3. So the proposed absorber is found appropriate for stealth aircraft, RCS and EMC reduction, isolation in MIMO antenna, imaging, and sensing in the X-band applications, discussed in Chapter-7. UWB Microwave Filter: In this research work, the design of the UWB filter with extended stopband characteristics by using a parallel-coupled line, open-ended line, multimode resonator (MMR), and defected ground structure (DGS) has been presented. This filter provides good return and insertion loss in the passband (3.1-10.6GHz) as well as stopband (10.8-18GHz). The group delay of the filter is almost constant throughout the passband. Detailed analysis of supportive coupled, feeding, and the open-ended line is vi verified with equivalent circuits. The prototype of the filter is compact as 22×20mm2 with a 109% fractional bandwidth. The proposed filter is suited for recent weather reporting Radar, Imaging, and Satellite receiver systems because simulated results have good agreement with measured results as discussed in the Chapter-8. RESEARCH OBJECTIVES: The major objectives of the research work are listed below: 1. To enhance the impedance bandwidth of the MIMO antenna and microstrip filter for various wireless applications. 2. To design and analyze the circularly polarized MIMO antenna for GPS, vehicular and 5G applications. 3. To enhance the isolation between the various elements of the MIMO antenna, to improve the various diversity parameters. 4. To enhance the specific absorption ratio (SAR) performance of the MIMO antenna for a handhold and mobile applications. 5. To design a Metasurface for stealth and isolation improvement in MIMO antenna applications.

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McMahan, Michael T. "Metamaterial absorbers for microwave detection." Thesis, Monterey, California: Naval Postgraduate School, 2015. http://hdl.handle.net/10945/45904.

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Approved for public release; distribution is unlimited
The development of high-power microwave weapons and dependence on electronics in modern weapon systems presents a high-power microwave weapons threat in future military conflicts. This study experimentally determines the absorption characteristics of simple metamaterial devices to potentially be used as protection and identification mechanisms, constructed through standard printed circuit board manufacturing processes, in the microwave region. Experimental results and analysis techniques are presented confirming absorption peaks in the anticipated microwave frequency range. The experimental results are compared to a finite-element model of these metamaterials confirming the ability to accurately model and predict absorption characteristics of similar metamaterial structures. Utilization of the absorption characteristics of these types of metamaterial structures to develop a microwave detector and/or equipment shielding is discussed. Several applications for such type of a detector are presented.

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Noor, Adnan. "Metamaterial electromagnetic absorbers and plasmonic structures." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/metamaterial-electromagnetic-absorbers-and-plasmonic-structures(7028ac57-86c2-4557-8f57-1acb03ee8800).html.

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In this thesis metamaterial radar absorbers and plasmonic structures have been investigated. Following a brief overview covering metamaterial structures, and their applications in various areas of Microwave Engineering, a novel thin metamaterial wideband radar absorber, formed by two layers of resistive Hilbert curve arrays, is proposed and analysed numerically in HFSS, revealing a reduction in Monostatic Radar Cross Section (RCS) of more than 10 dB from 9.1 to 18.8 GHz (70% fractional bandwidth) for both polarizations. The structure has thickness of only 0.11λ to 0.24λ at lowest and highest frequencies respectively. The lateral dimensions are only 0.13λ to 0.3λ per unit cell at lowest and highest frequencies respectively which is several times smaller than that of recently reported circuit analogue absorbers operating in the similar frequency band. Furthermore, a wideband terahertz Hilbert curve array is proposed and analyzed both theoretically and numerically, showing an absorption bandwidth of more than one octave. This was followed by study of plasmonic cloak for subwavelength conducting objects. It was demonstrated that a plasmonic cloak designed for a conducting sphere will work for non spherical conducting objects of similar dimensions as well. Finally spoof plasmonic structures were investigated. A novel plasmonic structure based on a modified Apollonian fractal array of cylindrical coaxial apertures in an aluminium sheet was proposed and analyzed. The structure exhibits negative group velocity with less than 3.5 dB attenuation. Plasmonic structure based on Sierpinski array of apertures was also investigated and found to give quite good extraordinary transmission bandwidth.

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Hao, Jianping. "Broad band electromagnetic perfect metamaterial absorbers." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10076/document.

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Ce travail de thèse concerne les structures artificielles à base de métamatériaux permettant la réalisation d’absorbants parfaits. Après une brève introduction des métamatériaux, de leur fonctionnement en tant qu’absorbants et de l’état de l’art, quatre types de structures fonctionnant en bandes centimétrique ou millimétrique ont été conçus puis fabriqués à savoir (i) des réseaux de cubes BaSrTiO3 (BST) basés sur les résonances de Mie, (ii) des réseaux désordonnés composés d’anneaux métalliques mettant en jeu des effets de résonance semblables aux systèmes plasmoniques (iii) des absorbants à quatre résonateurs élémentaires sur substrat flexible et (iv) des réseaux multicouches métal-diélectrique de forme pyramidale. Pour l’ensemble, des simulations numériques, corroborées par l’expérience en guide d’onde ou en espace libre, montrent l’existence d’un moment magnétique. Celui-ci est induit par une boucle des courants de déplacement et de conduction. Pour les structures périodiques, les conditions de grande largeur de bande d’absorption ont été établies sur la base du piégeage et de la dissipation de l’énergie incidente. Pour les réseaux désordonnés, il est montré le rôle capital des couplages entre résonateurs. Des structures périodiques à base de ferroélectrique de dimensions sous longueur d’onde ont été assemblées avec succès tandis que des absorbants flexibles ont été réalisés par technique d’impression jet d’encre montrant l’amélioration d’un facteur quatre de la bande d’absorption. Des améliorations comparables ont été obtenues à l’aide de réseaux d’anneaux, dont les positions dans le plan sont désordonnées, résultant de la distribution des fréquences de résonance par effet de couplage fort entre les résonateurs
In this thesis broadband Metamaterial Perfect Absorbers (MPAs) have been investigated. Following a brief introduction of metamaterials, operating mechanisms and state of the art of MPA, four absorber types operating either at centimeter or millimeter wavelengths have been designed and fabricated namely :(i) Mie-resonance based BaSrTiO3 (BST) arrays operating at microwaves, (ii) plasmonic-type disordered ring-shaped MPA, (iii) four patches millimeter wave flexible absorbers (iv) Pyramidal metal/dielectric stacked resonator arrays. For all the structures, it was demonstrated, through numerical simulations, assessed by characterization in a waveguide configuration or in free space, that unit absorbance relies on magnetic resonances induced by a current loop combining displacement and conduction currents. For periodic arrays, the condition for a broad band operation was established via the optimization of dissipation and trapping of electromagnetic energy in the resonators. For disordered metamaterials, it was shown the major role played by the magnetic dipole-dipole interaction. From the technological side, Ferroelectrics cube arrays with subwavelength dimensions were assembled onto a metal plate while flexible multi-resonators periodic arrays were successfully fabricated by ink-jet printing showing a fourfold enhancement of the absorbance bandwidth thanks to the overlapping of resonance frequencies. Comparable improvement in the bandwidth was also pointed out with randomly position metal ring arrays due to the distribution of resonance frequencies that result from tight in-plane resonator coupling

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Beeharry, Thtreswar. "Study of the electromagnetic interactions between radar equipment under integrated and compact mature : design and validation." Thesis, Paris 10, 2019. http://www.theses.fr/2019PA100011.

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Анотація:

Des propriétés électromagnétiques (EM) intéressantes peuvent être réalisées avec des Métamatériaux (MM), qui sont des matériaux artificiels sub-longueur d’ondes. Les propriétés EM peuvent être modifiées en modifiant la géométrie des MM. Les MM sont utilisés entre autres pour la conception d’antennes miniatures, des Absorbants Radars (AR) et le contournement des Ondes Electromagnétiques (OEM). Dans cette thèse nous avons utilisé des Surfaces Sélectives en Fréquences (FSS), qui sont une famille des MM, pour la réalisation des AR fines couches large bande. Ces AR sont destinés à la réduction des interférences des OEM entre les équipements radars à l’intérieur des radomes des navires militaires pour la bande de 1-10 GHz (CEM). Les AR large bande développés dans cette thèse ont été étudiés pour différentes polarisations (TE et TM) et différentes angles d’attaque. La Signature Equivalente Radar (SER) des AR a également été étudié. Ces AR ont été fabriqués et les résultats de mesures d’absorption sont en accord avec les résultats de simulation. Afin d’améliorer les performances d’absorption en polarisation croisée, des structures d’AR en ‘échiquier’ ont été proposées. Des plus les performances de rapport d’épaisseur théorique et d’épaisseur réel des AR développés sont extrêmement intéressantes à l’état de l’art. Une étude théorique a permis de concevoir et proposer de nouvelles structures d’AR conformes couvrant une cible cylindrique métallique. Ces AR se présente sous la forme de juxtaposition de plusieurs diélectriques sectoriels. On a démontré que le rayonnement total pouvait être diminué et que les zones d’ombres causés par des objets cylindriques pouvaient également être diminuées. La validation expérimentale de ce concept constituera un résultat remarquable de la thèse
Metamaterials (MM) are artificially engineered sub wavelength materials that can provide exceptional electromagnetic properties. Their electromagnetic properties can be changed by changing their shapes. They have been used for the design of antennas, Radar Absorbers (RA), cloak devices and so on. In the aim of reducing electromagnetic interference in radomes of military vessels, in this thesis we have used Frequency Selective Surfaces, which are a family of MM, to design thin and broadband RA for the 1-10 GHz frequency band. The RA designed in this thesis have been studied for different polarizations (TE and TM) and for different incidence angles. The Radar Cross Section (RCS) of the developed RA have also been studied. These RA have been fabricated and an excellent agreement have been found between measured and simulated absorption results. In order to improve the cross-polarization absorption of our RA, a ‘chessboard’ configuration of the full structures have been proposed and studied. Furthermore, the theoretical to real thickness ratio of developed RA have been calculated and results suggest that their performances are high. Also, a theoretical study has enabled us to design conformal RA for cylindrical metallic bodies. These RA are in fact sectors of dielectrics conformed around the cylindrical target. It has been shown that the total scattering and shadow zones of cylindrical metallic bodies can be reduced. The fabrication, characterization and measurement of this concept will be a remarkable result of this thesis

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Seren, Huseyin R. "Optically controlled metamaterial absorbers in the terahetz regime." Thesis, Boston University, 2014. https://hdl.handle.net/2144/12950.

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Thesis (Ph.D.)--Boston University
Electromagnetic wave absorbers have been intensely investigated in the last century and found important applications particularly in radar and microwave technologies to provide anechoic test chambers, or vehicle stealth. Adding new features such as dynamic modulation, absorption frequency tunability, and nonlinearity, absorbers gain further functions as spatial light modulators, adjustable protective layers, and saturable absorbers which was a key factor in creation of ultra-fast lasers. These efforts required a rigorous search on various materials to find desired behavior. As a rather recent research field Metamaterials (MM) provide an easier path for creation of such materials by allowing engineering the interaction between electromagnetic radiation and materials. Alongside many exotic applications such as invisibility cloaking or negative refraction, MMs also made perfect, or near-unity, absorbers possible. Thanks to their ability to control electric and magnetic responses, by matching the impedance of the MMs to that of free space and simultaneously increasing the losses in the structure, perfect absorption can be achieved. This has been experimentally demonstrated in various bands of electromagnetic spectrum such as microwave, terahertz (THz), infrared, and visible. As in their earlier counterparts, adding modulation and nonlinearity to MM absorbers will broaden their contribution especially in the THz region which is nascent in terms of optical devices such as switches, modulators or detectors. With the recent developments in the THz lasers, THz nonlinear absorbers will be needed to realize ultra-fast phenomena in this region. The main focus of this thesis is incorporating conventional and novel methods to create some of the initial examples of optically controlled MM THz perfect absorbers using microfabrication tools. [TRUNCATED]

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Kearney, Brian T. "Enhancing microbolometer performance at terahertz frequencies with metamaterial absorbers." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/37647.

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For Terahertz (THz) imaging to be useful outside of a laboratory setting, inexpensive yet sensitive detectors such as uncooled microbolometers will be required. Metamaterials can improve THz absorption without significantly increasing the thermal mass or using exotic materials because their absorption is primarily dependent on the geometry of the materials and not their individual optical properties. Finite Element (FE) simulations revealed that an array of squares above a ground plane separated by a dielectric is efficient, yet thin. Metamaterials were fabricated and their absorption characteristics were measured using a Fourier Transform Infrared Spectrometer (FTIR) indicating that the FE simulations are accurate. Metamaterial structures tuned to a quantum cascade laser (QCL) illuminator were incorporated into a bi-material sensor, which was used for detection of THz radiation from the QCL source with good sensitivity. In the case of microbolometers, a bolometric layer needs to be embedded in the metamaterial to form a thin microbridge. Simulations indicated that if the bolometric layer was resistive enough or close enough to the ground plane, then absorption would be largely unaltered. Metamaterials with a conductive Titanium (Ti) layer embedded into the dielectric spacer were fabricated and measured with an FTIR, confirming this behavior.

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Savvas, Michail. "Characterization of terahertz bi-material sensors with integrated metamaterial absorbers." Thesis, Monterey, California: Naval Postgraduate School, 2013. http://hdl.handle.net/10945/37711.

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THz radiation covers the region of the electro-magnetic (EM) spectrum between the microwaves and infra-red (IR), corresponding to frequencies from approximately 100 GHz to 10 THz. Recently, new imaging techniques, which take advantage of the special properties of THz waves, have been developed. Despite the great interest in these new techniques, limitations such as the lack of appropriate detectors and powerful sources are placing the technology in the research domain. The objective of this thesis is to characterize and analyze a set of fabricated bi-material detectors integrated with thin metamaterial films. Different experimental measurements were performed to measure the main figures of merit of the detectors and analyze them. Initially, optical microscopy was used to measure the dimensions of the sensors and stress induced curvature. Then, the thermal response of the sensors was tested and analyzed. The responsivity, the speed of operation and the minimum detected incident power were measured using a quantum cascade laser (QCL), operating at 3.8 THz. The measured experimental data agree well with the theoretical calculated values of the performance parameters.

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Книги з теми "METAMATERIAL ABSORBER"

Padilla, Willie J., and Kebin Fan. Metamaterial Electromagnetic Wave Absorbers. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-03765-8.

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Padilla, Willie J., and Kebin Fan. Metamaterial Electromagnetic Wave Absorbers. Morgan & Claypool, 2022.

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Neubauer, Noelannah, Antonio Miguel Cruz, Kebin Fan, Willie J. Padilla, and Adriana Ríos Rincón. Metamaterial Electromagnetic Wave Absorbers. Springer International Publishing AG, 2022.

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Fan, Kebin, and Willie J. Padilla. Metamaterial Electromagnetic Wave Absorbers. Morgan & Claypool Publishers, 2022.

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K, Sreelal R. Advanced Electromagnetic Applications: ELECTROMAGNETIC BAND-GAP MATERIALS and METAMATERIAL MICROWAVE ABSORBERS. Independently Published, 2020.

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Appasani, Bhargav, Om Prakash Acharya, Amitkumar Vidyakant Jha, and Nisha Gupta, eds. Metamaterials for Microwave and Terahertz Applications: Absorbers, Sensors and Filters. Nova Science Publishers, 2022. http://dx.doi.org/10.52305/aphy8244.

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Metamaterials for Microwave and Terahertz Applications: Absorbers, Sensors and Filters. Nova Science Publishers, Incorporated, 2022.

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Metamaterials for Microwave and Terahertz Applications: Absorbers, Sensors and Filters. Nova Science Publishers, Incorporated, 2022.

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Частини книг з теми "METAMATERIAL ABSORBER"

Agarwal, Sajal, and Yogendra Kumar Prajapati. "Metal-Insulator-Metal Metamaterial Helical Absorber." In Lecture Notes in Electrical Engineering, 25–30. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2631-0_3.

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Jain, Vandana, Sanjeev Yadav, Bhavana Peswani, Manish Jain, H. S. Mewara, and M. M. Sharma. "Design of Square Shaped Polarization Sensitive Metamaterial Absorber." In Proceedings of First International Conference on Information and Communication Technology for Intelligent Systems: Volume 2, 379–85. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30927-9_37.

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Ranjan, Prakash, Chetan Barde, Komal Roy, Rashmi Sinha, Sanjay Kumar, and Debolina Das. "Pixelated Wideband Metamaterial Absorber for X-band Applications." In Lecture Notes in Electrical Engineering, 553–62. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4975-3_44.

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Mahindroo, Kashish, Vani Sadadiwala, Vimlesh Singh, Devender Sharma, and Sarthak Singhal. "Triple-Band Polarization Independent C-Band Metamaterial Absorber." In Advances in Communication, Devices and Networking, 319–26. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2004-2_28.

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Shruti and Sasmita Pahadsingh. "Multiband Ultrathin Terahertz Metamaterial Absorber for Sensing Application." In Lecture Notes in Electrical Engineering, 525–32. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4866-0_64.

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Lee, Young Pak, Joo Yull Rhee, Young Joon Yoo, and Ki Won Kim. "Polarization-Independent and Wide-Incident-Angle Metamaterial Perfect Absorber." In Metamaterials for Perfect Absorption, 143–67. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0105-5_6.

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Hossain, Mohammad Jakir, Mohammad Rashed Iqbal Faruque, M. J. Alam, Eistiak Ahamed, and Mohammad Tariqul Islam. "New Compact Perfect Metamaterial Absorber for Dual Band Applications." In 10th International Conference on Robotics, Vision, Signal Processing and Power Applications, 381–86. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6447-1_48.

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Ayop, Osman, Mohamad Kamal A. Rahim, Noor Asniza Murad, and Noor Asmawati Samsuri. "Double Layer Polarization Insensitive Metamaterial Absorber with Dual Resonances." In Theory and Applications of Applied Electromagnetics, 231–38. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-17269-9_25.

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Kumar, Praveen, Rashmi Sinha, Arvind Choubey, Santosh Kumar Mahto, Pravesh Pal, and Ranjeet Kumar. "Design of Wideband Metamaterial Absorber for X-Band Application." In Lecture Notes in Electrical Engineering, 343–50. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4975-3_27.

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Nikhil, N. B., Bhavana R. Nair, Ancilla Philip, Nilotpal, Anu Mohamed, Chinmoy Saha, and Somak Bhattacharyya. "A Tunable Dual-Band Metamaterial Absorber for Terahertz Applications." In Computers and Devices for Communication, 288–93. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8366-7_41.

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Тези доповідей конференцій з теми "METAMATERIAL ABSORBER"

Climente, Alfonso, Daniel Torrent, and Jose´ Sa´nchez-Dehesa. "Noise Reduction by Perfect Absorbers Based on Acoustic Metamaterials." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65247.

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Анотація:

We have designed a cylindrical perfect absorber based on acoustic metamaterials. The absorber consists of a metamaterial shell that surrounds a center that dissipates the acoustic energy. The metamaterial shell is designed so that perfectly matches the acoustic impedance of the air background and guides the sound to the center. Numerical simulations are reported about the efficiency of the absorber as a function of the absorbing material employed at the center.

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Omeis, F., R. Smaali, A. Moreau, T. Taliercio, and E. Centeno. "Universal metamaterial absorber." In 2017 11th International Congress on Engineered Materials Platforms for Novel Wave Phenomena (Metamaterials). IEEE, 2017. http://dx.doi.org/10.1109/metamaterials.2017.8107906.

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Tanaka, Takuo. "Metamaterial absorbers and their applications." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.8a_a409_4.

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Анотація:

Recent advances in metamaterials enable us to create unprecedented optical materials, and as a example of such materials, perfect absorptive material surfaces within a certain frequency range were demonstrated. Since the metamaterial absorber offers a unique surface condition with tailored absorption properties, a wide variety of potential applications have been proposed.

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Pitchappa, Prakash, Chong Pei Ho, Piotr Kropelnicki, and Chengkuo Lee. "Complementary metamaterial infrared absorber." In 2013 International Conference on Optical MEMS and Nanophotonics (OMN). IEEE, 2013. http://dx.doi.org/10.1109/omn.2013.6659100.

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Hedayati, M. K., M. Abdelaziz, A. R. Jamali, and M. Elbahri. "Tailored metamaterial perfect absorber." In 2015 9th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS). IEEE, 2015. http://dx.doi.org/10.1109/metamaterials.2015.7342551.

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Bouras, Khedidja, Abdelhadi Labiad, and Mouloud Bouzouad. "Multiband Frequency Metamaterial Absorber." In 2019 International Conference on Advanced Electrical Engineering (ICAEE). IEEE, 2019. http://dx.doi.org/10.1109/icaee47123.2019.9014769.

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Lin, Weihao, Xiangkun Kong, Xin Jin, Shunliu Jiang, Lingqi Kong, and Xuemeng Wang. "Liquid Reconfigurable Metamaterial Absorber." In 2021 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2021. http://dx.doi.org/10.1109/icmmt52847.2021.9617827.

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Jaradat, Hamzeh, and Alkim Akyurtlu. "Broadband Infrared (IR) metamaterial absorber." In 2012 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2012. http://dx.doi.org/10.1109/aps.2012.6349209.

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Yoo, Min-Yeong, and Sungjoon Lim. "Switchable electromagnetic metamaterial reflector/absorber." In 2012 Asia Pacific Microwave Conference (APMC). IEEE, 2012. http://dx.doi.org/10.1109/apmc.2012.6421626.

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Pitchappa, Prakash, Chong Pei Ho, You Qian, Yu Sheng Lin, Navab Singh, and Chengkuo Lee. "MEMS switchable infrared metamaterial absorber." In International Conference on Experimental Mechanics 2014, edited by Chenggen Quan, Kemao Qian, Anand Asundi, and Fook Siong Chau. SPIE, 2015. http://dx.doi.org/10.1117/12.2081135.

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Звіти організацій з теми "METAMATERIAL ABSORBER"

Stinson, Eric A. Metamaterial Resonant Absorbers for Terahertz Sensing. Fort Belvoir, VA: Defense Technical Information Center, December 2015. http://dx.doi.org/10.21236/ad1009293.

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