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Tesis sobre el tema "METAMATERIAL ABSORBER"

Autor: Grafiati

Publicado: 26 de octubre de 2023

Última modificación: 25 de julio de 2025

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1

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<br>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 an

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2

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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Thesis advisor: Willie J. Padilla<br>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 st

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3

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 capac

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4

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<br>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

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5

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 f

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6

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 q

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7

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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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

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8

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<br>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

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9

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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Approved for public release; distribution is unlimited<br>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. M

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10

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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Approved for public release; distribution is unlimited<br>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

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11

Bhattarai, Khagendra Prasad. "Interference of Light in Multilayer Metasurfaces: Perfect Absorber and Antireflection Coating." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6680.

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We have studied several metamaterials structures with multiple layers by explaining them theoretically and verifying experimentally. The engineered structures we have designed work either as a perfect absorber or antireflection coating. The multilayer model as we call it Three Layer Model (TLM) has been developed, which gives the total reflection and transmission as a function of reflection and transmission of individual layers. By manipulating the amplitude and phase of the reflection and the transmission of the individual layers, we can get the required functionality of the optoelectronic de

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12

Odabasi, Hayrettin. "Novel Metamaterial Blueprints and Elements for Electromagnetic Applications." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366281874.

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13

Fneich, Zeinab. "La conception et la réalisation des absorbeurs en utilisant des métamatériaux." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMR095.

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Dans cette thèse, nous visons à concevoir des absorbants à larges bandes passantes pouvant fonctionner efficacement même en basses fréquences. Pour atteindre un tel objectif, nous profitons des propriétés des métamatériaux pour réaliser des dispositifs capables de remplacer les technologies actuelles d’absorbants destinés à des utilisations dans les chambres anéchoïques par exemple. Après avoir étudié l'état de l'art de l'absorbant à base de métamatériaux, nous avons choisi la conception pyramidale comme base de notre recherche eu égard à ses propriétés adaptées à notre application. Nous effec

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14

Thieury, Margaux. "Développement de métamatériaux super-absorbants pour l’acoustique sous-marine." Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLS004.

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L’évolution constante des performances des sonars nécessite de nouveaux designs de revêtements absorbants pour l’acoustique sous-marine. De tels revêtements sont utilisés pour améliorer la furtivité des sous-marins, mais ils permettent également d’accroître l’efficacité des systèmes de détection embarqués. Les méta-écrans bulleux (lointains descendants des revêtements de type Alberich) représentent une solution possible pour répondre à cet enjeu. Ils sont constitués d’une distribution périodique bi-dimensionnelle de cavités d’air de taille sub-longueur d’onde emprisonnées dans une matrice visc

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15

Leng, Julien. "Controlling flexural waves using subwavelength perfect absorbers : application to Acoustic Black Holes." Thesis, Le Mans, 2019. http://www.theses.fr/2019LEMA1027/document.

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Le contrôle des vibrations à basse fréquence adapté aux structures légères est un défi scientifique ettechnologique en raison de contraintes économiques et écologiques de plus en plus strictes. De récentes études enacoustique ont portées sur l’absorption totale d’ondes basses fréquences à l’aide d’absorbeurs parfaits sublongueursd’onde. Ces métamatériaux sont obtenus en exploitant la condition de couplage critique. Unegénéralisation de cette méthode pour le domaine élastodynamique serait d’un grand intérêt pour répondre auxexigences du contrôle des vibrations de structures légères à basse fréq

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16

Ju, Nyan-Ping, and 朱念平. "Straight-sidewall cavity broadband hyperbolic metamaterial perfect absorber." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/55dyb6.

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碩士<br>國立交通大學<br>電子工程學系電子研究所<br>104<br>A new structure for a nearly-perfect hyperbolic meta-material(HMM) absorber is proposed, and initial experimental verification is provided. To date, HMM PMAs are realized using tapered stacks that can provide adiabatic waveguiding over a wide spectral range. Nevertheless, the tapered nature can prevent its usage for large-area applications such as the emitters in thermophotovoltaics (TPV). The design proposed here has decent wavelength scalability and can be used from optical black holes to microwave perfect absorbers. The physics behind the HMM straight-

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17

Tu, Ming-Hsiang, and 杜銘祥. "A Multimetal Broadband Metamaterial Perfect Absorber With Compact Dimension." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/80411710935517753250.

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碩士<br>國立交通大學<br>電子研究所<br>105<br>An extremely simple multiple-metal metamaterial perfect absorber (MPA) has been proposed in this project. The dimension of the proposed design, for the visible wavelength range from 400 nm to 700 nm, is only 221 nm. Even if the plasmonic excitation is absent in this proposal, our design has dimension comparable to the past effort of MPAs using plasmonics. An unity broadband absorption can be achieved with ultra-thin metallic films. In addition, the wavelength scalability is possible using our design, and the fully-planar, simple configuration facilitates large-a

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18

Tseng, Ching-Wei, and 曾靖維. "Experimental realization of double-sided perfect metamaterial absorber at terahertz gap through stochastic design." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/64040910203015071966.

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19

Fu, Sze-Ming, and 傅思銘. "The applications of metamaterial perfect absorbers: functional absorbers and the thermal emitter." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/t6m2t4.

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博士<br>國立交通大學<br>電子研究所<br>107<br>Recently, metamaterial perfect absorber (MPA) has been widely investigated. At first, by using metamaterials, we can resolve the issue of narrow absorption band for photonic devices using anti-reflection coating structure and fulfill an ideal broadband perfect absorber. However, the researches of wavelength selectivity perfect absorber have gradually increased owing to its versatile applications. In this thesis, we integrate the planar perfect absorber with an aperiodic filter composed of two alternating dielectric thin films. The genetic algorithm is used to de

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20

Zhong, Yan-Kai, and 鐘彥凱. "The simulation and experiment of broadband metamaterial absorbers." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/6u3pmc.

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博士<br>國立交通大學<br>電子研究所<br>105<br>Hyperbolic metamaterial (HMM) absorber is widely investigated recently. However, the proposed tapered structure needs repeated lithography and etching steps, which are very time-consuming. As a result, several methods are proposed to deal with this problem. Firstly, straight-sidewall structure is utilized whose performance mainly depends on pattern design. Random pattern is preferable to realize broadband and high absorption. Nevertheless, simulation on random pattern is time-consuming. Consequently, experiment genetic algorithm is proposed to conduct the optimi

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21

洪以理. "Design and Experimental Characterization of Broadband Metamaterial Absorbers." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/36482104739743620017.

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碩士<br>逢甲大學<br>航太與系統工程學系<br>102<br>Metamaterials refer to special artificial materials which do not exist in nature, and such materials have unique features in sound, electromagnetic and light waves. The mechanism is regulated by a periodic pattern of the material to generate electric and magnetic resonances so as to enhance the filtering or absorbing ability. In this study, the carbonyl iron powder is mixed with epoxy resin to fabricate different weight percentage of absorber samples, of which the complex permittivity and permeability are measured. The performance of metamaterial absorbers is

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22

WU, YAO-CHING, and 吳耀青. "Design and Development of Stealth-oriented Wideband Metamaterial Absorbers." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/14507777286644124130.

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碩士<br>逢甲大學<br>航太與系統工程所<br>100<br>Metamaterials are materials with special physical quantities which can not be found in natural materials. Metamaterials are compound structures or materials which are artificially made through periodical arrangement of the material units to obtain unusual negative permittivity and negative permeability of the metamaterials. In this study, three different periodical structures, i.e., four-legged, circular ring, square loop structures combined with carbonyl iron-epoxy layers are used to design the microwave absorbing metamaterials. ANSYS HFSS is used to simulate

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23

"Opto-thermal Energy Transport with Selective Metamaterials and Solar Thermal Characterization of Selective Metafilm Absorbers." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.50496.

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abstract: The objective of this dissertation is to study the use of metamaterials as narrow-band and broadband selective absorbers for opto-thermal and solar thermal energy conversion. Narrow-band selective absorbers have applications such as plasmonic sensing and cancer treatment, while one of the main applications of selective metamaterials with broadband absorption is efficiently converting solar energy into heat as solar absorbers. This dissertation first discusses the use of gold nanowires as narrow-band selective metamaterial absorbers. An investigation into plasmonic localized heating

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24

Jung, Joo-Yun 1976. "Methods to achieve wavelength selectivity in infrared microbolometers and reduced thermal mass microbolometers." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-12-2088.

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The use of a patterned resistive sheet as an infrared-selective absorber, including the effects of a mechanical support dielectric layer is discussed. Also, modified dielectric coated Salisbury Screen can improve both the wavelength selectivity and the speed of thermal response for microbolometers. These patterned resistive sheets and Modified dielectric coated Salisbury Screen are a modified form of classical Salisbury Screens that utilize a resistive absorber layer placed a quarter-wavelength in front of a mirror. These structures can show a narrower detection bandwidth when compared to conv

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25

Yen, Ting Tso, and 葉庭佐. "Three-dimensional, miniaturized, and optimized terahertz metamaterials: a three-dimensional negative index medium, a double-sided perfect absorber and ultra-broad bandpass filters." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/8rra67.

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博士<br>國立清華大學<br>材料科學工程學系<br>104<br>The researches on THz gap (0.1-30 THz) have attracted much attention in recent years because the THz gap is a transition regime between microwave and far-infrared (IR), i.e., the watershed between the electronic and optical responses so that matters in THz gap in nature possess weak electronic and optical responses, and such weak responses hinder generation and detection of THz signals. Therefore, we eager to apply metamaterials to THz devices based on the properties of metamaterials that is well developed in microwave, IR and even visible region such as thei

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