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Relevant bibliographies by topics / Harmonic scattering / Dissertations / Theses

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Dissertations / Theses on the topic 'Harmonic scattering'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 June 2024

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1

Jasieczek, Christina Bozena. "Investigation of hydrogen bonding and SHG activity of organic salts and co-crystals." Thesis, University of Sussex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318504.

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2

Schürer, Benedikt Otmar [Verfasser]. "Application of Second Harmonic Scattering for the Characterisation of Colloidal Interfaces / Benedikt Otmar Schürer." München : Verlag Dr. Hut, 2012. http://d-nb.info/1028784228/34.

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3

Battaglini, Elena. "Study of the second hyperpolarizability of poly(3-alkylthiophenes) using the third-harmonic scattering technique." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20633/.

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During the past years, the considerable need in the domain of communications for more potent photonic devices has focused the research activities into the nonlinear optical (NLO) materials which can be used for modern optical switches. In this regard, a lot of research activities are focused on the organic materials and conjugated polymers which offer more advantages compared to the inorganic ones. On this matter, poly(3-alkylthiophene) (P3AT), an organic conjugated polymer, can be investigated as potential optical material with in particular the focus on the NLO properties such as the first-

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4

Wunderlich, Sarina [Verfasser], and Ulf [Akademischer Betreuer] Peschel. "Second harmonic light scattering from dielectric and metallic spherical nanoparticles / Sarina Wunderlich. Gutachter: Ulf Peschel." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2014. http://d-nb.info/1075743982/34.

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5

Lütgebaucks, Cornelis [Verfasser]. "Lipid membrane characterization with second harmonic scattering: surface potentials, ionization, membrane asymmetry and hydration / Cornelis Lütgebaucks." Aachen : Shaker, 2017. http://d-nb.info/1149279419/34.

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6

Cramer, Elena [Verfasser], and A. [Akademischer Betreuer] Kirsch. "Scattering of time-harmonic electromagnetic waves involving perfectly conducting and conductive transmission conditions / Elena Cramer ; Betreuer: A. Kirsch." Karlsruhe : KIT-Bibliothek, 2019. http://d-nb.info/1200470915/34.

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7

Shao, Yongmei. "X-ray scattering study of the critical behavior of the second harmonic in the density wave system 7APCBB." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/32146.

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8

Dhayal, Suman. "Nonlinear and Quantum Optics Near Nanoparticles." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc822820/.

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We study the behavior of electric fields in and around dielectric and metal nanoparticles, and prepare the ground for their applications to a variety of systems viz. photovoltaics, imaging and detection techniques, and molecular spectroscopy. We exploit the property of nanoparticles being able to focus the radiation field into small regions and study some of the interesting nonlinear, and quantum coherence and interference phenomena near them. The traditional approach to study the nonlinear light-matter interactions involves the use of the slowly varying amplitude approximation (SVAA) as it si

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9

Wijekoon, Wijekoon Mudiyanselage Kapila Piyasena. "Waveguide Surface Coherent anti-Stokes Raman Scattering Spectroscopy and optical second harmonic generation spectroscopy of molecules adsorbed on metal oxide surfaces." Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184444.

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This dissertation reports the application of nonlinear optical effects for the investigation of vibrational and electronic spectroscopy of molecules adsorbed on thin film metal oxide surfaces and metal oxide surfaces. The main emphasis of the experiments cited here is to introduce the recently developed multi-photon technique, Waveguide Surface Coherent anti-Stokes Raman Scattering Spectroscopy (WSCARS), to the scientific community. Planar optical waveguides have been utilized to generate large optical field enhancements on metal oxide surfaces. Guided waves have been employed to obtain the su

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10

Sharifian, Gh Mohammad. "Adsorption and Transport of Drug-Like Molecules at the Membrane of Living Cells Studied by Time-Resolved Second-Harmonic Light Scattering." Diss., Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/524558.

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Chemistry<br>Ph.D.<br>Understanding molecular interactions at the surfaces of cellular membranes, including adsorption and transport, is of fundamental importance in both biological and pharmaceutical studies. At present, particularly with respect to small and medium size (drug-like) molecules, it is desirable to gain an understanding of the mechanisms that govern membrane adsorption and transport. To characterize drug-membrane interactions and mechanisms governing the process of molecular uptake at cellular membranes in living organisms, we need to develop effective experimental techniques to

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11

Kothari, Neeraj. "Novel Polarimetry Techniques." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19779.

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Polarization specific measurements are advancing the capabilities of scientific instruments looking for ever smaller effects and material parameters. For example, the magneto-optical nonlinear Faraday effect can be used to characterize various electric and magnetic polarizability parameters of an individual molecule. Another major application is detection of desired particles in a highly scattering environment, the physical effect of which has been extensively researched, and is being overcome by using time-gated and polarization techniques. The polarimeter sensitivity is limited by the extinc

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12

Guo, Xinxin. "Nonlinear architected metasurfaces for acoustic wave scattering manipulation." Thesis, Le Mans, 2018. http://www.theses.fr/2018LEMA1030/document.

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Ces dernières années, les métamatériaux acoustiques sont largement étudiés pour leur intérêt dans la réalisation de divers types de contrôle des ondes à une échelle sub-longueur d’onde. En particulier, les métasurfaces acoustiques ont montré leur capacité à manipuler des ondes en limites de milieux de propagation via les processus de réflexion, de transmission et de réfraction. Contrairement au régime linéaire qui concerne l’immense majorité des travaux sur les métamatériaux acoustiques, les études sur les propriétés non linéaires des métamatériaux, de surcroit des métasurfaces, restent peu no

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13

MORTATI, LEONARDO MICHAEL. "Coherent Anti-Stokes Raman Scattering, Second Harmonic Generation and Two-Photon Excitation Fluorescence Multimodal Microscope: Realization, Metrological Characterization and Applications in Regenerative Medicine." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2509905.

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In the frame of the research in biology and in particular in regenerative medicine, it is widely requested the ability to perform measurements that have a low impact on the observed biological systems. Many measurements imply sample modifications and also sample fixation avoiding living samples measurements. In this doctoral thesis it is presented the realization of an advanced optical multimodal microscope that integrates coherent anti-Stokes Raman scattering, second harmonic generation and two-photon excitation fluorescence techniques in a single powerful tool. The combination of all these m

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van, der Kolk Jarno Nicolaas. "Theory of Image Formation in Non-linear Optical Microscopy." Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36650.

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Nonlinear optical microscopy is a collection of very powerful imaging techniques. Linear optical microscopes probe the refractive index and absorption, which both stem from the first-order linear electric susceptibility. Especially in biological tissue, the variation in the refractive index is often small and the tissue is, in many cases, transparant. Nonlinear optical microscopes on the other hand probe the nonlinear higher-order susceptibilities, which can be chemically sensitive, leading to the capability to achieve label-free imaging. Nonlinear optical microscopes have been in developme

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15

Singh, Anu. "Nonlinear optical properties of nanostructures, photochromic and lanthanide complexes in solution." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2012. http://tel.archives-ouvertes.fr/tel-00826653.

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Nonlinear optics is well known to be a highly powerful tool to investigate the properties of the materials. In this thesis we used two important nonlinear optical techniques known as Electric Field Induced Second Harmonic Generation (EFISH) and Harmonic Light Scattering (HLS) to study the first hyperpolarizability of various molecular objects. Firstly, we evidenced the pi donor conjugation in cyclometallated Ir complexes. We have also explored the series of trinuclear organometallic triaryl-1, 3, 5-triazinane-2, 4, 6-triones functionalized by d6-transition metal acetylides complexes at their p

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Pardaev, Shokir A. "LIGHT SCATTERING STUDIES OF DEFECTS IN NEMATIC/TWIST-BEND LIQUID CRYSTALS AND LAYER FLUCTUATIONS IN FREE-STANDING SMECTIC MEMBRANES." Kent State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=kent1497022792130101.

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McGuire, John Andrew. "Femtosecond nonlinear spectroscopy at surfaces Second-harmonic probing of hole burning at the Si(111)7x7 surface and fourier-transform sum-frequency vibrational spectroscopy." Berkeley, Calif. : Oak Ridge, Tenn. : Lawrence Berkeley National Laboratory ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/836810-xRj01W/native/.

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Thesis (Ph.D.); Submitted to the University of California, Berkeley, CA (US); 24 Nov 2004.<br>Published through the Information Bridge: DOE Scientific and Technical Information. "LBNL--56751" McGuire, John Andrew. USDOE Director. Office of Science. Office of Basic Energy Sciences. Materials Science and Engineering Division (US) 11/24/2004. Report is also available in paper and microfiche from NTIS.

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Mansfield, Jessica. "Multi-photon microscopy of cartilage." Thesis, University of Exeter, 2008. http://hdl.handle.net/10036/42345.

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Articular cartilage has been imaged using the following multi-photon modalities: Second Harmonic Generation (SHG), Two-photon Fluorescence (TPF) and Coherent Anti-Stokes Raman Scattering (CARS). A simple epi detection microscope was constructed for SHG and TPF imaging in the early stages of this research. Later the imaging was transferred to a new microscope system which allowed simultaneous forwards and epi detection and combined CARS imaging with TPF and SHG. Multiphoton spectroscopic studies were conducted on both intact tissue samples and the major components of the extracellular matrix, i

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Pelegati, Vitor Bianchin 1982. "Microscopias ópticas de processos coerentes." [s.n.], 2016. http://repositorio.unicamp.br/jspui/handle/REPOSIP/321828.

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Orientador: Carlos Lenz César<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-09-01T03:43:43Z (GMT). No. of bitstreams: 1 Pelegati_VitorBianchin_D.pdf: 6822381 bytes, checksum: 86749ce34dc184aeb7ed4b4ee47d70b3 (MD5) Previous issue date: 2016<br>Resumo: Técnicas de microscopias ópticas são as principais ferramentas capazes de observar células e tecidos biológicos em tempo real e com mínimo dano. Essa área foi revolucionada recentemente através das microscopias confocais de varredura a laser e as microscopias de ópt

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Butet, Jérémy. "Diffusion de second harmonique par les nanoparticules métalliques à symétrie sphérique." Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10115/document.

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Ce travail de thèse a porté sur l’étude de la génération de second harmonique par lesnanoparticules métalliques. La présence de résonances de plasmon de surface localisées dans lesnanoparticules métalliques accroit la section efficace non linéaire et le but de ce travail a été decomprendre comment ce couplage peut être mis à profit. D’un point de vue fondamental, lacomparaison entre expérience et théorie a permis de mettre en évidence le mode d’émissionoctupolaire ainsi que de pondérer les contributions de surface et de volume au signal total émis.Il a également été démontré que des profils de

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21

Joulaud, Cécile. "Caractérisation par diffusion de second harmonique de nanocristaux pour l'imagerie biomédicale." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00856045.

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Les nanocristaux à structure non-centrosymétrique présentent des propriétés optiques non linéaires prometteuses pour une utilisation en tant que marqueurs optiques en imagerie biomédicale, avec un intérêt significatif en termes de suivi sur de longues durées et de profondeur de pénétration dans les tissus biologiques. Le développement de ces marqueurs nécessite la détermination de leurs efficacités optiques non linéaires afin de pouvoir sélectionner les nanocristaux les plus prometteurs. Pour cela, la technique de diffusion Hyper-Rayleigh a été adaptée à la caractérisation de suspensions de na

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Maurice, Anthony. "Diffusion de second harmonique en milieux liquides : approche comparée des réponses de volume et de surface." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1337/document.

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Ce manuscrit décrit le processus optique non linéaire de Génération de Second Harmonique (acronyme anglais SHG pour Second Harmonic Generation) réalisé en phase liquide. En particulier, la propriété de cohérence de ce processus est étudiée en détail. En effet, en raison de la parité du processus SHG, cette cohérence est perdue dans les liquides. Ces études portent ainsi sur plusieurs géométries afin d’accéder aux réponses de volume et de surface. Les avantages d’une méthode combinée sont aussi discutés. Dans une première partie, la configuration classique de la Diffusion Hyper Rayleigh (acrony

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23

Caudron, Boris. "Couplages FEM-BEM faibles et optimisés pour des problèmes de diffraction harmoniques en acoustique et en électromagnétisme." Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0062/document.

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Dans cette thèse, nous proposons de nouvelles méthodes permettant de résoudre numériquement des problèmes de diffraction harmoniques et tridimensionnels, aussi bien acoustiques qu'électromagnétiques, pour lesquels l'objet diffractant est pénétrable et inhomogène. La résolution de tels problèmes est centrale pour des calculs de surfaces équivalentes sonar et radar (SES et SER). Elle est toutefois connue pour être difficile car elle requiert de discrétiser des équations aux dérivées partielles posées dans un domaine extérieur. Étant infini, ce domaine ne peut pas être maillé en vue d'une résolut

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Barranco, Antonio Vidiella. "A ELETRODINAMICA ESTOCASTICA E O EFEITO COMPTON." Universidade de São Paulo, 1987. http://www.teses.usp.br/teses/disponiveis/43/43132/tde-24062015-153147/.

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A dissertação pode ser dividida em duas partes: a primeira contém uma adaptação do modelo fenomenológico de Einstein conhecido como \"método dos coeficientes A e B\". As modificações são feitas no contexto da Eletrodinâmica Estocástica, uma teoria na qual as flutuações de ponto zero do campo eletromagnético são consideradas reais e clássicas. Nós obtemos, num estudo não relativístico e clássico, relações entre a energia e momento de partículas livres e a frequência da radiação transferida. Estas relações coincidem com as bem conhecidas relações que representam a conservação do quadrivetor mome

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Šedý, Michal. "Syntéza struktur s elektromagnetickým zádržným pásmem." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218036.

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In microwave frequency band, the planar technology is mainly used to fabricate electronic circuits. Propagation of surface waves belongs to the significant problem of this technology. 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. This thesis is focused on the modeling of these structures in the program COMSOL Multiphysics.

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Sopena, Moros Arturo. "Etude des effets relativistes en régime d’interaction non-linéaire entre les molécules et les impulsions laser brèves dans les domaines de fréquences XUV et X mous." Thesis, Bordeaux, 2021. http://www.theses.fr/2021BORD0131.

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Le développement des sources XUV intenses du type laser à électrons libres (LEL) et génération d’harmoniques d’ordre élevé (GHOE) en régime femtoseconde (fs) et sub-fs permet l’investigation des processus non-linéaires ultra rapides dansl’interaction laser-matière. Dans le contexte de l’étude de la dynamique de la photoionisation moléculaire aux temps ultra-brefs, la résolution directe de l’équation de Schrödinger dépendante du temps (ESDT) s’est révélée cruciale pour l’interprétationdes observations expérimentales. Dans cette thèse, nous présentons des calculs ab-initio pour la photo-ionisati

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Caudron, Boris. "Couplages FEM-BEM faibles et optimisés pour des problèmes de diffraction harmoniques en acoustique et en électromagnétisme." Electronic Thesis or Diss., Université de Lorraine, 2018. http://www.theses.fr/2018LORR0062.

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Dans cette thèse, nous proposons de nouvelles méthodes permettant de résoudre numériquement des problèmes de diffraction harmoniques et tridimensionnels, aussi bien acoustiques qu'électromagnétiques, pour lesquels l'objet diffractant est pénétrable et inhomogène. La résolution de tels problèmes est centrale pour des calculs de surfaces équivalentes sonar et radar (SES et SER). Elle est toutefois connue pour être difficile car elle requiert de discrétiser des équations aux dérivées partielles posées dans un domaine extérieur. Étant infini, ce domaine ne peut pas être maillé en vue d'une résolut

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El, Harfouch Yara. "Optique linéaire et non linéaire de films de nano particules métalliques." Phd thesis, Université Claude Bernard - Lyon I, 2009. http://tel.archives-ouvertes.fr/tel-00877726.

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La technique de la génération de second harmonique (SHG) a été employée pour étudier la réponse non linéaire des assemblées de nano particules métalliques aux interfaces liquides. Les nanoparticules ont d'abord été caractérisées en utilisant la génération de second harmonique incohérente, également nommée diffusion hyper Rayleigh. L'étude de particules d'or et d'argent, nanosphères et des nanobâtonnets, ont permis de mettre en évidence l'influence de la couche protectrice de surfactants sur l'hyperpolarisabilité quadratique de ces particules. Ces particules ont ensuite été placées à l'interfac

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Badia, Ismaïl. "Couplage par décomposition de domaine optimisée de formulations intégrales et éléments finis d’ordre élevé pour l’électromagnétisme." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0058.

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La résolution numérique d’un problème de diffraction électromagnétique tridimensionnel en régime harmonique est connue pour être difficile, notamment en haute fréquence et pour des objets diffractants diélectriques et inhomogènes. En effet, elle nécessite de discrétiser un système d’équations aux dérivées partielles posé sur un domaine infini. De plus, le fait de considérer une petite longueur d’onde λ dans ce cas, nécessite naturellement un maillage très fin, ce qui conduit par conséquent à un très grand nombre de degrés de liberté. Une approche standard consiste à combiner une méthode d’équa

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Ge, Xunyou. "Imagerie ultrarapide à l’échelle nanométrique par diffraction XUV cohérente." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112361/document.

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Imager des objets non-périodiques à une échelle nanométrique et à une échelle femto seconde est un vrai challenge à notre époque. Les techniques d’imagerie « sans lentille » sont des moyens puissants pour répondre à ce besoin. En utilisant des sources ultrarapide (~fs) et cohérente (ex. laser à électron libre ou harmoniques d’ordres élevés), ces techniques nous permettent de reconstruire des objets à partir de leur figure de diffraction, remplaçant les optiques conventionnelles du système d’imagerie par un algorithme informatique. Dans ce travail de thèse, je présent des expériences d’imagerie

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Mishra, Kamini. "Protein Adsorption on Gold Nanoparticle and Protein Surfaces Probed by Second Harmonic Light Scattering." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5443.

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Second harmonic light scattering (SHLS) is a highly sensitive technique to probe reactions at interfaces/surfaces because of symmetry breaking at the interface/surface produces a large surface polarization which gives rise to large SHLS. In the electric dipole approximation, when the bulk solution is isotropic, the surface is the sole source of SH signal. Second harmonic scattering signal from surfaces/interfaces is non-destructive, does not require any particular chemical species and can be carried out in situ. The first report on the observation of SH signal from the particle−solvent i

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Hung-Liang-Tseng and 曾宏量. "The Scattering of a Vertical Transverse Isotropic Cylindrical Canyon Subjected to Time-Harmonic Elastic Wave." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/85611784979191904306.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>103<br>The objective of this research is to study the scattering of a vertically transversely isotropic cylindrical canyon subjected to the incidence of time harmonic plane elastic wave. The total displacement field of either the anti-plane or in-plane scattering problem can be decomposed into two parts, namely, free field as well as scattering filed part. The known free field part can be further separated into incident wave and reflected wave in order to satisfy the ground surface condition. While the unknown scattering field part is expanded into a series of n-th o

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SHIH, MING-CHOU, and 施名洲. "Scattering Problem of a Vertical Transverse Isotropic Circular Cylindrical Cavity Subjected to Time-Harmonic Elastic Wave." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8r96d5.

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Chandra, Manabendra. "Probing The Origin Of Second Harmonic Generation From Copper Nanoparticles In Solution By Hyper-Rayleigh Scattering." Thesis, 2008. https://etd.iisc.ac.in/handle/2005/814.

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In recent years, coinage metal nanoparticles have emerged as materials with largest quadratic optical nonlinearity. Their first hyperpolarizabilities (β) are very high (105-106 x 10-30 esu) but such large values were quite unexpected because of their apparently centrosymmetric bulk structure. Only a small second harmonic generation (SHG) from coinage metal nanoparticles is expected through higher order multipolar (e.g., quadrupolar) polarization mechanisms. Various possible reasons have been attributed to the observation of large β values in coinage metal nanoparticles. They are: 1) Particle

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Chandra, Manabendra. "Probing The Origin Of Second Harmonic Generation From Copper Nanoparticles In Solution By Hyper-Rayleigh Scattering." Thesis, 2008. http://hdl.handle.net/2005/814.

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In recent years, coinage metal nanoparticles have emerged as materials with largest quadratic optical nonlinearity. Their first hyperpolarizabilities (β) are very high (105-106 x 10-30 esu) but such large values were quite unexpected because of their apparently centrosymmetric bulk structure. Only a small second harmonic generation (SHG) from coinage metal nanoparticles is expected through higher order multipolar (e.g., quadrupolar) polarization mechanisms. Various possible reasons have been attributed to the observation of large β values in coinage metal nanoparticles. They are: 1) Particles

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Yang, Chiu-Hsiang, and 楊久庠. "Scattering Problem of a Vertical Transverse Isotropic Special Oblate Elliptical Cavity Subjected to Time-Harmonic Elastic Wave." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/7346s2.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>105<br>The objectives of this thesis is aim to study the scattering as well as the dynamic stress concentration phenomenon of a vertically transversely isotropic special oblate elliptic cylindrical cavity subjected to the obliquely incidence of time harmonic plane elastic wave. An incident plane wave field traveling through three different types of exterior medium then impinging onto a special oblate elliptic cylindrical cavity with certain specific aspect ratio. There will have different solution strategies according to different types of material property. Since th

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NTIBARIKURE, LAURENT. "Contributions to the Art of Finite Element Analysis in Electromagnetics." Doctoral thesis, 2014. http://hdl.handle.net/2158/843133.

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The finite element method is a powerful method for the approximate solution of boundary value problems governed by partial differential equations. A really first application to structural engineering problems, dating 1943, is attributed to R. Courant. Since then, there has been a lot of successful tentatives to apply the method to other fields. In particular, Silvester showed in 1969 that waveguide modes could be easily computed with the method. His work started a long path for finite elements in electromagnetics, with multiple assessments of the method with real-world problems and gradually i

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RUIJTER, MARCEL. "Radiation effects for the next generation of synchrotron radiation facilities." Doctoral thesis, 2022. http://hdl.handle.net/11573/1636547.

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High energy radiation is an important tool for many fields of research as it allows for the measurement of smaller structures and atomic interactions. The current best method of generating coherent and narrow bandwidth synchrotron radiation is with a free electron laser. It requires very high charge density, to start the amplification process and concurrently leads to its high level of coherency, and high energies (GeV to obtain keV photons). The stringent parameters on the electron bunch are met by linear accelerators. These are typically kilometre long straight structures that operate from

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MCKAY, EDWARD G. II. "ELECTROMAGNETIC PROPAGATION AND SCATTERING IN SPHERICALLY-SYMMETRIC TERRESTRIAL SYSTEM-MODELS (WAVE GUIDE, ZONAL, HARMONICS)." Thesis, 1986. http://hdl.handle.net/1911/15997.

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A study of the quantitative solutional approaches to boundary-value problems associated with terrestrial electromagnetic propagation is carried out, with particular attention given to spherical-system models and the frequency range below 3 MHz. The field solutions are determined from dyadic Green's functions, the elements of which are infinite Bessel-Legendre (zonal harmonic) series. The three classical approaches to evaluating these solutions--mode theory, wave-hop, and summation of the zonal harmonic series--are surveyed, and techniques to improve the rate of convergence of the latter series

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Filippov, Oleg. "Vectorial beam coupling in fast photorefractive crystals with AC-enhanced response." Doctoral thesis, 2004. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2004092812.

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We develop a theory of vectorial wave coupling in cubic photorefractive crystals placed in an alternating ac-field to enhance the nonlinear response. First we analytically and numerically investigate the dependences of the first Fourier harmonics of the space-charge field, induced in an AC-biased sillenite crystal by a light-interference pattern, on the light contrast m. The data obtained was used to extend the vectorial beam-coupling theory on the whole contrast region. In particular, we proved in the general case that despite of essential differences between thediffusion and AC nonlocal resp

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ARRIGHETTI, Walter. "Mathematical models and methods for Electromagnetism on fractal geometries." Doctoral thesis, 2007. http://hdl.handle.net/11573/1656600.

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This work summarizes the research path done by Walter Arrighetti during his three years of Doctorate of Research in Electromagnetism at Università degli Studi di Roma “La Sapienza,” Rome, under the guidance of Professor Giorgio Gerosa. This work was mainly motivated by the struggle to ﬁnd simpler and simpler models to introduce complex geometries (like fractal ones, for example, which are complicated but far from being ‘irregular’) in physical ﬁeld theories like the Classical Electrodynamics, and which stand at the base of most contemporary applied research activities: from antennas (of any si

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