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Rozprawy doktorskie na temat „METAMATERIA”

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Data publikacji: 11 września 2023

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1

Ni, Sisi (Sisi Sophie). "Phononic metamaterials based on complex geometries : "a new kind of metamaterial"." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/89957.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>Facing the growing challenges of energy, environment, security and disease treatment, the demand for novel materials are growing. While the material centric approach have resulted in development of new materials for advanced applications, we introduce a geometric approach as a complementary point of view for further innovation in this ever expanding and growing field. Inspired by the ubiquitous fractals
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Macêdo, Jorge Andrey da Silva. "Formalismo FDTD para a modelagem de meios dispersivos apresentando anisotropia biaxial." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18155/tde-15102008-135510/.

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Este trabalho apresenta um novo formalismo bi-dimensional em diferenças finitas no domínio do tempo (2D-FDTD) para a simulação de estruturas baseadas em metamateriais. A natureza dispersiva destes meios é levada em consideração de forma precisa pela inclusão dos modelos materiais de Drude para os tensores permissividade elétrica e permeabilidade magnética. Todos os elementos dos tensores são considerados neste formalismo, o que o torna muito atraente para a modelagem de uma classe geral de estruturas eletromagnéticas. Dois efeitos de enorme impacto são analisados em detalhes, sendo eles a cob
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Martínek, Luděk. "Antény s kryty z metamateriálů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-219978.

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This thesis deals with microstrip antennas covered by the metamaterials. First, are described planar antennas, their problems and the emergence of surface waves. Surface waves can cause unwanted coupling among particular parts of the structure and can degrade its parameters. The problem can be solved using an electromagnetic band gap structure (EBG). These periodic structures are able to suppress surface waves in different frequency bands. It is shown how the EBG structure in the function superstate improve directivity and antenna gain. Radiation conventional microstrip antenna with metallo-di
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Sartori, Eduardo Jose. "Metodologia experimental de desenvolvimento de grades metamateriais com permissividade quase-zero e negativa." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260806.

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Orientador: Hugo E. Hernandez Figueroa<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-14T23:26:41Z (GMT). No. of bitstreams: 1 Sartori_EduardoJose_D.pdf: 11903812 bytes, checksum: 6e06f001155d33b841c61ae93464c897 (MD5) Previous issue date: 2009<br>Resumo: Metamateriais são estruturas ou arranjos geométricos feitos a partir de materiais comuns, dielétricos, condutores, magnéticos ou por combinação destes. Os metamateriais caracterizam-se principalmente por apresentarem propriedades especiais de p
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Strikwerda, Andrew. "Metamaterial enhanced coupling." Thesis, Boston University, 2012. https://hdl.handle.net/2144/31611.

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Thesis (Ph.D.)--Boston University<br>PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>In the past decade interest in metamaterials has risen dramatically. This is due, in large part, to metamaterials' ability to exhibit electromagnetic behavior not normally found in nature. This is because the
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Li, Lianbo. "Metamaterial based superdirectivity." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:65f10679-cbf2-4c86-897e-8121225c44eb.

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A model-supporting, simple, compact, robust and high efficiency two- element parasitic superdirective array comprising electrically small reso- nant metamaterial elements, namely singly split resonator rings (SSRRs), is predicted by an analytical model and is verified by CST simulation re- sults. The analytical model is built by combining a method of calculating a two-SSRR array's far fild radiated energy density and a well working equivalent circuit for a two-SSRR parasitic array. This model is capable of easily but accurately predicting the far field radiation behaviours of an electrically s
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7

Shepard, III Ralph Hamilton. "Metamaterial Lens Design." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/194734.

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Developments in nanotechnology and material science have produced optical materials with astonishing properties. Theory and experimentation have demonstrated that, among other properties, the law of refraction is reversed at an interface between a naturally occurring material and these so-called metamaterials. As the technology advances metamaterials have the potential to vastly impact the field of optical science.In this study we provide a foundation for future work in the area of geometric optics and lens design with metamaterials. The concept of negative refraction is extended to derive a c
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Ekmekci, Evren. "Design, Fabrication And Characterization Of Novel Metamaterials In Microwave And Terahertz Regions: Multi-band, Frequency-tunable And Miniaturized Structures." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612730/index.pdf.

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This dissertation is focused on the design, fabrication, and characterization of novel metamaterials in microwave and terahertz regions with the following outcomes: A planar &micro<br>-negative metamaterial structure, called double-sided SRR (DSRR), is proposed in the first part of this study. DSRR combines the features of a conventional split ring resonator (SRR) and a broadside-coupled SRR (BC-SRR) to obtain much better miniaturization at microwave frequencies for a given physical cell size. In addition to DSRR, double-sided multiple SRR (DMSRR), double-sided spiral resonator (DSR), and dou
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9

Tan, Szu Hau. "Metamaterial for Radar Frequencies." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17465.

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Approved for public release; distribution is unlimited<br>The objective of this thesis is to investigate a new design of periodic metamaterial (MTM) structure for radar cross-section (RCS) reduction application on aircraft and ships. MTMs are man-made materials, not found in nature, that exhibit unusual properties in the radio-, electromagnetic-, and optical-wave bands. The cells of these periodic MTM structures must be much smaller than the wavelength of the frequency of interest. In a MTM, the structure and dimensions of the design at the frequency of interest can produce negative values of
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Demetriadou, Angela. "Studies of metamaterial structures." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/11396.

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11

Le-Van, Quynh. "Optoelectronic Metamaterials." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS082/document.

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Une nouvelle génération de dispositifs électroniques et optoélectroniques combinant hautes performances et bas coût se profile grâce aux promesses des films à boîtes quantiques colloïdales (BQCs) et de leurs propriétés électriques et optiques uniques. Les BQCs sont des nanocristaux semi-conducteurs synthétisés en solution qui se comportent comme des atomes artificiels. Des progrès considérables ont été réalisés durant la dernière décennie pour développer une optoélectronique à base de films BQCs mais les performances des composants réalisés sont toujours limitées par un certain nombre de propr
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12

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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13

Wang, Weijen 1980. "Directive antenna using metamaterial substrates." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/17995.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2004.<br>Includes bibliographical references (p. 83-86).<br>Using a commercially available software(CST Microwave Studio®), two kinds of simulations have been carried out on different metamaterials in the microwave regime. One is transmission and reflection of a unit cell in a waveguide, and the other is parallel plate slab farfield radiation. The S-parameters are obtained from the wave-guide simulation and are used to retrieve the effective permittivity and permeability with which we
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14

Hasan, Md Kamrul. "Metamaterial Antenna for Medical Applications." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1367944880.

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15

Erentok, Aycan. "Metamaterial-Based Electrically Small Antennas." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/195725.

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The introduction of the so-called metamaterials, artificial materials which have engineered electromagnetic responses that are not readily available in nature, and their exotic properties have provided an alternate design approach that has led to improved performance characteristics of several radiating and scattering systems. This dissertation work introduces an antenna design paradigm based on the incorporation of metamaterials, which have negative permittivity and/or permeability medium properties, with simple radiating elements to obtain efficient electrically-small antenna systems. The mo
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16

Thomas, John Rhodes. "Investigation of properties of materials with negative permittivity and permeability : negative refraction /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/6113.

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Ambrosio, Leonardo Andre 1980. "Feixes localizados em pinças opticas com particulas convencionasi e metamateriais." [s.n.], 2009. http://repositorio.unicamp.br/jspui/handle/REPOSIP/260409.

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Orientador: Hugo Enrique Hernandez Figueroa, Michel zamboni Rached<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação<br>Made available in DSpace on 2018-08-14T09:52:49Z (GMT). No. of bitstreams: 1 Ambrosio_LeonardoAndre_D.pdf: 7134713 bytes, checksum: 36a77f1e2e7f49fb16e793969325d64e (MD5) Previous issue date: 2009<br>Resumo: Nesta tese, abordamos aplicações de feixes localizados em FSO - Free Space Optics - e em pinças ópticas, com ênfase maior para o segundo. No primeiro caso, mostramos que é possível pré-determinar o padrão de intens
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18

Shelton, David. "TUNABLE INFRARED METAMATERIALS." Doctoral diss., University of Central Florida, 2010. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3925.

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Metamaterials are engineered periodic composites that have unique refractive-index characteristics not available in natural materials. They have been demonstrated over a large portion of the electromagnetic spectrum, from visible to radiofrequency. For applications in the infrared, the structure of metamaterials is generally defined using electron-beam lithography. At these frequencies, the loss and dispersion of any metal included in the composite are of particular significance. In this regard, we investigate deviations from the Drude model due to the anomalous skin effect. For comparison wit
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19

Yang, Biao. "Photonic topological metamaterials." Thesis, University of Birmingham, 2018. http://etheses.bham.ac.uk//id/eprint/8103/.

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Topology, a mathematical concept associated with global perspectives, was found to represent geometric aspects of physics. To date, various topological phases have been proposed and classified. Among them, topological gapless phases focusing on the degeneracies of energy bands serving as the singularities in the momentum space, attract much attention. Especially in the three-dimension, various topological semimetals have been proposed. With unit topological charge ±1, Weyl degeneracies have laid the foundation. Also, they show loads of exotic properties, such as Fermi arcs and chiral anomalies
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Atmatzakis, Evangelos. "Bimetallic photonic metamaterials." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/399982/.

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In this thesis, I introduce bimetallic ring resonator arrays as a platform for enhancing and controlling magneto-optical and thermoelectric effects. By taking advantage of differences in the physical (optical, electronic, thermal, magnetic) properties of the two elements comprising the resonators, I have demonstrated tailoring of the optical absorption and the Faraday effect, and generation of THz magnetic pulses. In particular: I have theoretically predicted for the first time the light-driven generation of intense, highly-localised, THz magnetic pulses in thermoelectric metamaterials. Excita
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21

Plum, Eric. "Chirality and metamaterials." Thesis, University of Southampton, 2010. https://eprints.soton.ac.uk/301296/.

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Electromagnetic metamaterials are artificial media that derive novel properties from periodic structuring on the sub-wavelength scale. Here, the consequences of two-dimensional (2D) and three-dimensional (3D) chirality for the electromagnetic properties of metamaterials are investigated. The focus of this work is on new ways of achieving circular conversion dichroism, optical activity and negative refraction in highly symmetric structures. In the theoretical part of this work, fundamental constraints on polarization effects in planar metamaterials are established based on symmetry and energy c
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Ou, J. Y. "Reconfigurable photonic metamaterials." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/379328/.

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This thesis reports on the development of a new class of switchable nanostructured photonic metamaterials, Reconfigurable Photonic Metamaterials (RPMs). Over the last decade, fascinating material properties including negative refraction, optical magnetism, invisibility, asymmetric transmission, perfect lenses and many more were demonstrated in metamaterials. Inspired by pioneering work on micro-electro mechanical metamaterials for the terahertz and microwave spectral regions with feature sizes from millimeters to tens and hundreds microns, I develop reconfigurable photonic metamaterials for th
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Jenett, Benjamin(Benjamin Eric). "Discrete mechanical metamaterials." Thesis, Massachusetts Institute of Technology, 2020. https://hdl.handle.net/1721.1/130610.

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Thesis: Ph. D., Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, September, 2020<br>Cataloged from the official PDF version of thesis.<br>Includes bibliographical references (pages 127-136).<br>Digital fabrication enables complex designs to be realized with improved speed, precision, and cost compared to manual techniques. Additive manufacturing, for example, is one of the leading methods for rapid prototyping and near net shape part production. Extension to full scale structures and systems, however, remains a challenge, as cost,
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Ferrer, González Pere Josep. "Multifunctional metamaterial designs for antenna applications." Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/312841.

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Over the last decades, Metamaterials (MTMs) have caught the attention of the scientific community. Metamaterials are basically artificially engineered materials which can provide unusual electromagnetic properties not present in nature. Among other novel and special EM applications, such as the negative refraction index (NRI) application, Metamaterials allow the realisation of perfect magnetic conductors (PMCs), which are of interest in the development of smaller and more compact antenna systems composed of one or more antennas. In this context, this thesis is focused on investigating the fea
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Hedayati, Mehdi Keshavarz [Verfasser]. "Tunable Plasmonic Metamaterial / Mehdi Keshavarz Hedayati." Kiel : Universitätsbibliothek Kiel, 2014. http://d-nb.info/1055941444/34.

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Peruch, Silvia. "Ultrafast properties of plasmonic nanorod metamaterial." Thesis, King's College London (University of London), 2016. https://kclpure.kcl.ac.uk/portal/en/theses/ultrafast-properties-of-plasmonic-nanorod-metamaterial(d981b5e4-b959-4193-8cf1-219b68de08d6).html.

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Plasmonic metamaterials have customized linear and nonlinear optical properties. This thesis investigates the properties of an anisotropic plasmonic metamaterial, consisting of aligned, interacting gold nanorods, to perform ultrafast light modulation, exploiting the intrinsic Kerr nonlinearity of gold. This e ect is based on an illumination-intensity-dependent change in the gold's permittivity, which takes place on ultrafast timescales and induces the intensity-dependent change of the metamaterial's re ection and transmission. A comprehensive theoretical and numerical analysis of the linear an
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Phillips, Allan T. "Resonant terahertz absorption using metamaterial structures." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/27888.

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The Sensor Research Lab at the Naval Postgraduate School is developing a real-time THz imaging camera. Vital to its design is the metamaterial absorbing layer (metafilm) within each pixel that allows for THz absorption. While there are numerous applications in the THz region, sensors and sources for THz energy have much room for improvement. The use of metamaterial technology for the purpose of a THz sensor has the potential to reduce costs while greatly improving sensitivity performance. The Sensor Research Lab has fabricated metafilms capable of near 100 percent absorption. In this research
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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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Brito, Davi Bibiano. "Metamaterial inspired improved antennas and circuits." Universidade Federal do Rio Grande do Norte, 2010. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15152.

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Made available in DSpace on 2014-12-17T14:54:58Z (GMT). No. of bitstreams: 1 DaviBB_DISSERT_1-70.pdf: 4567680 bytes, checksum: 150ff5afc1806ca374278b4c00a1f5a3 (MD5) Previous issue date: 2010-12-06<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>Metamaterials exhibiting negative refraction have attracted a great amount of attention in recent years mostly due to their exquisite electromagnetic properties. These materials are artificial structures that exhibit characteristics not found in nature. It is possible to obtain a metamaterial by combining artificial structures
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Aquino, Manoel do Bonfim Lins de. "Antena de microfita com substrato metamaterial." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15224.

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Made available in DSpace on 2014-12-17T14:55:12Z (GMT). No. of bitstreams: 1 ManoelBLA.pdf: 2395577 bytes, checksum: 6394225c6ebbbdad59d4fa162aa97882 (MD5) Previous issue date: 2008-11-19<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>This paper presents a theoretical and numerical analysis of the parameters of a rectangular microstrip antenna with metamaterial substrate. The metamaterial (MTM) theory was applied along with Transverse Transmission Line (LTT) method to characterize substrate quantities and obtain the general equations of the electromagnetic fields. A study
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Lei, Qin. "All dielectric composites for metamaterial applications." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:2dd643a5-7590-44a2-833a-148ffaa655f6.

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This thesis describes my work on manufacturing of all dielectric polymer/ceramic composites for electromagnetic property customisation at microwave frequencies. Electromagnetic wave manipulation can be achieved with the help of transformation optics concept and metamaterials with desired permittivity and permeability properties. The use of all-dielectric metamaterials, in particular, offers a novel solution to broadband, low loss microwave devices. In this work, polymer/ceramic composites were studied to provide materials with a wide range of permittivity that can be customised precisely by op
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Maassel, Michael. "A Metamaterial-Based Multiband Phase Shifter." Diss., North Dakota State University, 2014. https://hdl.handle.net/10365/27095.

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A design methodology for a multi-band phase shifter using a metamaterial-based transmission line was developed. This method is different in that the loaded-line phase shifter has a phase shift of 90 degrees at the center frequencies of both bands instead of -90 degrees and -270 degrees. The method was validated using simulation and measured results.
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Ijaz, Bilal. "Metamaterial-Inspired Reconfigurable Series-Fed Arrays." Diss., North Dakota State University, 2014. https://hdl.handle.net/10365/27593.

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One of the biggest challenges in modern day wireless communication systems is to attain agility and provide more degrees of freedom in parameters such as frequency, radiation pattern and polarization. Existing phased array antenna technology has limitations in frequency bandwidth and scan angle. So it is important to design frequency reconfigurable antenna arrays which can provide two different frequency bandwidths with a broadside radiation pattern having a lower sidelobe and reduced frequency scanning. The reconfigurable antenna array inspired by the properties of metamaterials presented her
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Venkatakrishnan, Rajiv Krishnan. "Compact Metamaterial UHF RFID Tag Antennas." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1313767918.

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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 f
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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 q
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Heffernan, Travis Jade. "Metamaterial Enhanced Wireless Power Transmission System." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1069.

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Nikolai Tesla's revolutionary experiments demonstrated the possible benefits of transmitting power wirelessly as early as 1891. Applications for the military, consumers, emergency personnel, remote sensors, and others use Tesla’s discovery of wireless power. Wireless power transmission (WPT) has the potential to be a common source of consumable energy, but it will only receive serious consideration if the transmit and receive systems are extremely efficient and capable of delivering usable amounts of power. Research has been conducted to improve the efficiency and performance of nearly every a
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38

Guelber, Elise Fraga. "Aplicação de células metamateriais em antenas planares." reponame:Repositório Institucional da UFABC, 2016.

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Orientador: Prof. Dr. Carlos Eduardo Capovilla<br>Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Elétrica, 2016.<br>A tecnologia metamaterial vem sendo estudada cientificamente e suas propriedades prometem efeitos inovadores em suas aplicações. A possibilidade de manipular o comportamento eletromagnetico em um dispositivo cercado por metamateriais abre portas para a criação e otimização de novos dispositivos. Qualquer sistema que envolva dispositivos de microondas, optica e antenas, está na grade dos beneficiados por essa tecnologia. As principais
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Měcháček, Radek. "Studie šíření širokospektrých signálů nehomogenním prostředím." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218407.

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Work is focused on both theoretical knowledge of the electromagnetic field and the specific properties of metamaterials measured. First, be informed about the fundamentals of electromagnetic fields, the issue of periodic structures to the properties required metastructures. Further experimental work is designed to measure the properties of metamaterials. The measurements will be used as harmonic signals and broadband signals in the frequency range 100MHz to 10GHz. In the last part of the proposed work is carried out experimental work and are evaluated some characteristics of the antennas and m
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40

Manktelow, Kevin Lee. "Dispersion analysis of nonlinear periodic structures." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51936.

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The present research is concerned with developing analysis methods for analyzing and exploring finite-amplitude elastic wave propagation through periodic media. Periodic arrangements of materials with high acoustic impedance contrasts can be employed to control wave propagation. These systems are often termed phononic crystals or metamaterials, depending on the specific design and purpose. Design of these systems usually relies on computation and analysis of dispersion band structures which contain information about wave propagation speed and direction. The location and influence of complete (
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41

Kadic, Muamer. "Metamaterials for surface plasmons." Thesis, Aix-Marseille 3, 2011. http://www.theses.fr/2011AIX30026.

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Le travail présenté dans cette thèse comporte différents attrayant sujetsde l'optique comme les métamatériaux, l’optique transformationnelle, lescristaux photoniques, la réfraction négative et les interactions thermoplasmoniques.Nous avons développé plusieurs métamatériaux pour les plasmons desurface basés sur l'optique de transformation. Tout d'abord, nous avonsdémontré théoriquement, numériquement et expérimentalement certainsdispositifs mettant en scène le phénomène d’invisibilité.Deuxièmement, nous avons démontré la réfraction négative des plasmonsde surface en utilisant le concept d'espac
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Papakostas, Aris. "Planar chiral optical metamaterials." Thesis, University of Southampton, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.444955.

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Barr, Lauren. "Giving metamaterials a hand." Thesis, University of Exeter, 2018. http://hdl.handle.net/10871/34561.

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The focus of this thesis is the interaction of electromagnetic fields with chiral structures in the microwave regime. Through this study, which focuses on three regimes of electromagnetic interactions, I aim to develop a deeper understanding of the consequences and manifestations of chiral interactions The structures are on the order of, or smaller than, the wavelength of the probing radiation. As the structures are chiral, they have broken inversion symmetry, and exist in two states where one is the mirror image of the other. The results in this thesis can have impacts on future optical commu
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Williams, Christopher. "Teraherts waveguiding on metamaterials." Thesis, University of Bath, 2009. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520384.

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Terahertz time-domain spectroscopy (TTDS) is a powerful spectroscopic technique, combining pulsed broadband operation with high sensitivity coherent detection at room temperature. This thesis describes studies of terahertz surface plasmon polariton (SPP) guidance on a range of metamaterial structures using TTDS. Metamaterials are artificial media constructed from sub-wavelength dimension conducting elements which have an electromagnetic response that can be engineered by creating geometrical plasma-like resonances. In this work, high-confinement terahertz waveguiding is achieved by binding SPP
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Dubrovina, Natalia. "Metamaterials for photonic applications." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112088/document.

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L’objet de cette étude concerne l’exploration, à la fois sur le plan théorique et expérimental, de la possibilité d’utilisation des métamatériaux pour des applications dans le domaine de la photonique aux longueurs d’onde télécoms (λ=1.5µm). L’un des principaux objectifs adressés dans le cadre de la thèse est de réaliser l’ingénierie de l’indice effectif en utilisant des résonances des plasmons de surface localisés des métamatériaux métallo-diélectriques. Deux cas particulièrement importants du point de vue de la réalisation technologique sont considérés :• Propagation en espace libre quand un
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Karvounis, Artemios. "All dielectric reconfigurable metamaterials." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/424497/.

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This thesis reports on my research efforts towards all-dielectric metamaterials with reconfigurable functionalities: • I have reported the first optomechanical nonlinear dielectric metamaterial. I have shown that such metamaterials provide extremely large optomechanical nonlinearities at near infrared, operating at intensities of only a few μW per unit cell and modulation frequencies as high as 152 MHz, thereby offering a path to fast, compact, and energy efficient all-optical metadevices. • I have experimentally demonstrated the first all-dielectric electro-optical nanomechanical modulator ba
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ElKabbash, Mohamed. "ACTIVE PLASMONICS AND METAMATERIALS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1512659080056302.

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Zedler, Michael. "Systematic topological design of metamaterials : scalar and vectorial 3D metamaterials and their realisation." kostenfrei, 2008. http://mediatum2.ub.tum.de/doc/653119/653119.pdf.

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Prat, Camps Jordi. "Shaping magnetic felds with superconductor-metamaterial hybrids." Doctoral thesis, Universitat Autònoma de Barcelona, 2015. http://hdl.handle.net/10803/309138.

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El magnetisme és molt important en diverses àrees de la ciència i la tecnologia, cobrint un rang molt ampli d'escales i temes. En aquesta tesis presentem el desenvolupament teòric i la realització experimental de diversos dispositius nous pel control dels camps magnètics. Pel disseny d'aquests s'han emprat diverses estratègies; la teoria de l'òptica de transformació s'ha combinat amb resultats obtinguts directament de les equacions de Maxwell, i les propostes idealitzades han esdevingut dispositius reals mitjançant la combinació de materials ferromagnètics i superconductors formant diferents m
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King, Neil James. "Aspects of metamaterial structures : theory and simulation." Thesis, University of Salford, 2007. http://usir.salford.ac.uk/26761/.

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The investigations reported here address the issue of overcoming loss in a typical isotropic metamaterial. The possibility of adding functionality to such materials, through gyrotropic effects, and diffraction management of nonlinear beams, driven by negative phase accumulation, is presented. Loss is overcome by the introduction of gain to the metamaterial. This is achieved on the basis that typical split-ring metaparticles can be suitably enhanced through the addition of carefully selected diodes. The detailed analysis given here deploys a familiar equivalent circuit model and specific curren
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