Dissertations / Theses on the topic 'Optical phenomena'
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AMARAL, Anderson Monteiro. "Transverse optical phenomena with Gaussian beams and optical vortices." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18646.
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CNPQ
In this thesis are presented various results regarding the transverse structure of light beams in the paraxial propagation regime, with a special concern with singularities in the transverse profile and in nonlinear optics applications. Theoretical and experimental tools were developed for the study of Optical Vortices (OV) and its most important characteristics, as the Orbital Angular Momentum (OAM) and the Topological Charge (TC). In a first step, we theoretically described and experimentally demonstrated that it is possible to shape the intensity profile of a beam containing OV by distributing TC over the plane transverse to the propagation direction [1]. The TC is associated with a phase singularity that implies in points of zero intensity. By distributing the TC on the transverse plane, it is possible to shape the beam dark region and also the OAM profile with the goal of optimizing the light beam for a given application. However, a problem identified in [1] was that most of the current available techniques to characterize OAM light implicitly assume that the beam has cylindrical symmetry, thus being inadequate to characterize fields resulting from more general TC distributions. These problems were approached in a second work [2], where it was shown that by measuring the field transverse amplitude and phase profiles it is possible to measure the OAM and the TC in TC distributions with arbitrary geometries. By combination of the results [1] and [2] it is possible to optimize and characterize the TC distributions for given applications, as for example by designing the transverse forces in an optical tweezer for microparticle manipulation. An important theoretical unfold during these works was the identification of an analogous relation between the field transverse phase in a TC distribution with the Coulomb potential in two-dimensional electrostatics. We then introduced in [3] the Topological Potential (TP) concept which allows the design of structured optical beams with complex spatial profiles inspired by two-dimensional electrostatics analogies. The TP can be used to describe a broad class of TC distributions, as those from [1,2] or the more sophisticate examples in [3]. In another set of results, it is discussed the possibility of using concepts and the formalism of quantum mechanics to solve light propagation problems in the classical approximation. Among the results obtained, it should be remarked that the formalism obtained has a simple and direct relation with ABCD matrices and ray optics [4]. These results were used to understand light propagation in systems containing nonlinear materials, as in SLIM [5] and D4σ [6] techniques. In [5, 6] the theoretical results were compared with experimental data obtained from standard samples, as carbon dissulfide (CS2), acetone and fused silica. It was obtained a very good agreement between the measured optical nonlinearities and the results established in literature for these materials.
Nesta tese são apresentados resultados relacionados com a estrutura transversal de feixes de luz no regime paraxial de propagação, com uma atenção especial em singularidades no perfil transversal e em aplicações para óptica não linear. Foram desenvolvidas ferramentas teóricas e experimentais para o estudo de vórtices ópticos (Optical Vortices - OVs), e suas características mais importantes, como o momento angular orbital (Orbital Angular Momentum - OAM) e a carga topológica (Topological Charge - TC). Inicialmente, foi teoricamente descrito e experimentalmente demonstrado como é possível moldar o perfil de intensidade de um feixe contendo OVs usando uma distribuição de TC sobre o plano transversal à direção de propagação [1]. A TC está associada a uma singularidade na fase, o que implica em um zero de intensidade. Ao se distribuir a TC sobre o plano transversal, é possível moldar o formato da região de intensidade nula e também o perfil de OAM no intuito de otimizar o feixe para uma dada aplicação. No entanto, um problema identificado neste trabalho é que a maior parte das técnicas de caracterização disponíveis para luz com OAM implicitamente supunham que o feixe possui simetria cilíndrica, e portanto não eram adequadas para caracterizar campos obtidos a partir de distribuições de TC com geometrias mais gerais. Tais problemas foram abordados em um segundo trabalho [2], onde foi mostrado que por meio de medições dos perfis transversais de amplitude e fase do campo elétrico é possível medir o OAM e a TC em distribuições de TC com formas geométricas arbitrárias. A união dos trabalhos [1] e [2] permite então que as distribuições de TC possam ser adequadamente otimizadas e caracterizadas para aplicações específicas, como por exemplo ao moldar as forças transversais numa pinça óptica para a manipulação de micropartículas. Um desdobramento teórico importante obtido foi identificar uma relação análoga entre o perfil de fase em uma distribuição de TC com o potencial de Coulomb em eletrostática bidimensional. Foi então introduzido em [3] o conceito de potencial topológico (Topological Potential - TP) que possibilita a construção de feixes ópticos estruturados com perfis espaciais complexos inspirados em analogias com eletrostática bidimensional. O TP pode ser usado na descrição de uma grande variedade de distribuições de TC, como nos feixes em [1, 2] ou nos exemplos mais sofisticados em [3]. Posteriormente, é discutida a possibilidade de se utilizar conceitos e o formalismo da mecânica quântica na solução de problemas de propagação da luz descrita na aproximação clássica. Dentre os resultados obtidos, destaca-se que o formalismo possui uma relação simples e direta com as matrizes ABCD e a óptica de raios [4]. Estes resultados foram utilizados na compreensão da propagação da luz em sistemas contendo materiais não lineares, como nas técnicas SLIM [5] e D4σ[6]. Nos trabalhos [5,6] os resultados teóricos foram comparados com dados experimentais obtidos em amostras padrão, como dissulfeto de carbono (CS2), acetona e sílica fundida. Foi obtida uma concordância muito boa entre os valores medidos para as não linearidades ópticas nestes materiais e os valores estabelecidos na literatura.
Taylor, Jonathan Midgley. "Optical binding phenomena : observations and mechanisms." Thesis, Durham University, 2009. http://etheses.dur.ac.uk/54/.
Full textPester, Paul D. "Optical beam induced phenomena in semiconductors." Thesis, University of Oxford, 1988. http://ora.ox.ac.uk/objects/uuid:a02591ee-1600-4c9c-ab19-30447edc07da.
Full textFORTENBERRY, RANCE MORGAN. "NONLINEAR OPTICAL PHENOMENA IN ZINC OXIDE WAVEGUIDES (INTEGRATED OPTICS, NONLINEAR COUPLING)." Diss., The University of Arizona, 1986. http://hdl.handle.net/10150/183951.
Full textFameli, Nicola. "Optical studies of critical phenomena in fluids." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ56538.pdf.
Full textVázquez, Lozano Juan Enrique. "Spin-Dependent Optical Phenomena: Fundamentals and Applications." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/166775.
Full text[CA] Igual que la massa o la càrrega, l'espín és una propietat física fonamental que, típicament, apareix en la descripció dels sistemes quàntics. Més enllà de les seves importants implicacions teòriques, el creixent avanç de la tecnologia i el desenvolupament dels dispositius cap a escales cada vegada més petites ha afavorit el sorgiment de multitud d'aplicacions que involucren l'espín, entre les quals es destaca l'espintrònica; una nova forma d'electrònica en què, a més de la càrrega, també s'exploten els graus de llibertat atorgats per l'espín de l'electró. Per descomptat, l'espín no és exclusiu dels electrons, és present en totes les partícules elementals, i per tant, en els fotons. En aquest cas, i a diferència del que passa amb els electrons, hi ha una correspondència clàssica que relaciona l'espín del fotó amb els estats de polarització circular de la llum. Per tant, en nano-òptica i en fotònica, els fenòmens basats en l'espín es refereixen, grosso modo, a aquells que són fortament dependents de la polarització circular de la llum. En aquest marc general, un dels exemples més preponderants es troba en la interacció espín-òrbita. En la seva versió òptica estableix que, sota certes condicions, és possible que hi hagi una influència mútua entre l'estat de polarització (espín) i la propagació (òrbita) de la llum. Malgrat el seu caràcter ubic en tots els processos òptics bàsics, els seus efectes són molt febles, i la seva manifestació es restringeix a la nanoescala, la qual cosa dificulta la seva observació i identificació. En aquest mateix context, un altre concepte heretat del formalisme quàntic que té anàleg fotònic directe és la quiralitat òptica; una propietat dinàmica local que, d'alguna manera, quantifica escalarment l'espín d'un camp òptic. A banda del seu controvertit significat físic i el seu estret vincle amb els sistemes plasmònics i els metamaterials, com amplificadors dels seus efectes, la seva principal característica fonamental és que, per als camps òptics en el buit, és una quantitat conservada. Des d'un enfocament teòric, aquesta tesi aprofundeix en els fonaments bàsics d'aquestes característiques fotòniques. Específicament, es demostra analíticament que la interacció espín-òrbita és un fenomen que sorgeix natural i necessàriament en la nanoescala. Sobre aquesta base s'exposa un formalisme per estendre l'efecte d'excitació unidireccional de camp pròxim més enllà de l'aproximació dipolar, la qual cosa facilita la seva observació i millora les propietats d'acoblo. D'altra banda, s'analitza el concepte de la quiralitat òptica, originalment definida en el buit, i es generalitza a qualsevol tipus de mitjà, incloent sistemes altament dispersius. Així mateix, s'exploren diferents configuracions que permetin implementar les principals funcionalitats quiròptiques (sensat i espectroscòpia) en plataformes de fotònica integrada. A més del seu potencial per a aplicacions, aquest estudi tendeix un pont per abordar clàssicament propietats i efectes tradicionalment quàntics.
[EN] Just like mass or charge, spin is a fundamental physical property that, typically, appears in the description of quantum systems. Beyond its important theoretical implications, the rapid advance of technology along with the relentless trend toward the development of devices at increasingly smaller scales have boosted the occurrence of a wide range of applications involving spin, among which is highlighted the spintronics; a novel form of electronics which, besides the charge, also exploits the degrees of freedom provided by the electron spin. Of course, the spin is not exclusive to electrons, but is actually present in all the elementary particles, and therefore in photons. In such a case, and unlike what happens with electrons, there exists a direct classical correspondence relating the spin of photons with the circular polarization states of light. Thus, in nano-optics and photonics, spin-dependent phenomena are broadly referred to as those that strongly rely upon the circular polarization of light. Within this general framework, one of the most preponderant examples is found in the spin-orbit interaction. In its optical version, it states that, under certain conditions, it is possible that there exists a mutual influence between the state of polarization (spin) and the propagation (orbit) of light. Despite its ubiquitous character in all basic optical processes, its effects are very weak, and its manifestation is restricted at the nanoscale, thereby hindering its observation and identification. In this same context, another concept somehow inherited from the quantum formalism with a direct photonic analogue is the optical chirality; a local dynamical property that, in a way, allows one to quantifying scalarly the spin of an optical field. Apart from its controversial physical meaning and its close relationship with plasmonic systems and metamaterials, often regarded as chiral enhancers, its main feature is that, for optical fields in the vacuum, it is a conserved quantity. From a theoretical standpoint, this thesis delves into the basics of these photonic traits. Specifically, it is analytically demonstrated that the spin-orbit interaction is indeed a phenomenon that naturally and necessarily emerges at the nanoscale. Building on this, it is addressed a formalism to extend the effect of near-field unidirectional excitation beyond the dipolar approximation, thus facilitating its observation and improving the coupling performance. On the other side, the optical chirality, originally put forward for electromagnetic fields in vacuum, is thoroughly analyzed and generalized to any arbitrary medium, including highly dispersive systems. Furthermore, different configurations for implementing the main chiroptical functionalities (sensing and spectroscopy) in integrated photonic platforms are explored. Besides its potential for applications, this study lays a bridge to classically approach features and effects which are traditionally quantum-like.
This work was supported by fundings from Ministerio de Economía y Competitividad of Spain (MINECO) under Contract No.TEC2014-51902-C2-1-R. and by ERC Starting Grant No. ERC-2016-STG-714151-PSINFONI. This work was also partially supported by funding from the European Commission Project THOR H2020-EU-829067.
Vázquez Lozano, JE. (2021). Spin-Dependent Optical Phenomena: Fundamentals and Applications [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/166775
TESIS
Laohakunakorn, Nadanai. "Electrokinetic phenomena in nanopore transport." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/252690.
Full textNasta, Manish H. "Loss phenomena in perturbed single-mode optical fibers : investigation and applications /." Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-06112009-064004/.
Full textSakaida, Masaru. "Disorder-induced quantum phenomena in inhomogeneous optical lattices." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215289.
Full textMitchell, John Edward. "Beat noise and related phenomena in optical networks." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392668.
Full textSelli, Raman Kumar. "Fibre optic temperature sensors using fluorescent phenomena." Thesis, City University London, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236641.
Full textSchumann, Robert Paul. "Surface plasmon random scattering and related phenomena." Thesis, Connect to title online (Scholars' Bank) Connect to title online (ProQuest), 2009. http://hdl.handle.net/1794/10297.
Full textHentschel, Martina. "Mesoscopic wave phenomena in electronic and optical ring structures." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2001. http://nbn-resolving.de/urn:nbn:de:swb:14-1008319980781-38394.
Full textIn this work we investigate wave phenomena in mesoscopic systems using different theoretical approaches. In Part I, we focus on effectively one-dimensional electronic ring structures and address the phenomenon of geometric phases in spin-dependent electronic transport in the presence of non-uniform magnetic fields. In the general non-adiabatic case, exact solutions of the Schrödinger equation are used in a transfer matrix formalism to compute the transmission probability through the ring. In the magneto-conductance we identify clear signatures of interference effects due to geometric phases, for example in rings where the non-uniform field is created by a central micromagnet. For the special case of an in-plane magnetic field we predict an interesting spin-flip effect that allows one to control the spin polarization of electrons by applying an external Aharonov-Bohm flux. Optical mesoscopic systems are the subject of Part II. We consider two-dimensional annular structures characterized by different refractive indices, and apply classical methods from geometric optics as well as wave concepts based on Maxwell's equations. For the first time, an S-matrix approach is successfully employed in the description of resonances in optical microresonators; in particular we propose the dielectric annular billiard as an attractive model system. Comparing ray and wave pictures, we find general agreement, except for large wavelengths of the order of the system size, where corrections to the ray model are necessary. The Goos-Hänchen effect as an extension of the ray picture is shown to quantitatively account for wave modifications of Fresnel's laws due to curved interfaces. We derive novel analytical expressions for the corrected Fresnel formulas for both polarizations of light. Motivated by the successful ray description, we give a conclusive interpretation of a recent filter experiment on a quadrupolar glass fibre, and suggest novel concepts for microresonator-based lasers
Enell, Carl-Fredrik. "Optical studies of polar stratospheric clouds and related phenomena /." Kiruna : Swedish Institute of Space Physics (Institutet för rymdfysik), 2002. http://www.irf.se/publications/SciReports/IRFreport278.pdf.
Full textHill, Matthew Peter. "A test of special relativity using coherent optical phenomena." Thesis, University of Leeds, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.522943.
Full textCotter, Joseph paul. "A precision test of relativity using coherent optical phenomena." Thesis, University of Leeds, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.487714.
Full textFischbach, Stefan. "Nonlinear optical phenomena in fluoride glass and hybrid fibres." Thesis, University of Bath, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715304.
Full textHadis, Mohammed Abdul. "Polymerisation kinetics and optical phenomena of photoactive dental resins." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/1730/.
Full textUno, Kazuyuki. "Localization Phenomena and Optical Properties in AlGaAs Disordered superlattices." Kyoto University, 1997. http://hdl.handle.net/2433/202282.
Full textMai, Thuc T. "Optical spectroscopy of cooperative phenomena and their symmetries in solids." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555629359625425.
Full textHuynh, Dan-Nha. "Nonlinear optical phenomena within the discontinuous Galerkin time-domain method." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19396.
Full textThis thesis is concerned with the theoretical description of nonlinear optical phenomena with regards to the (numerical) discontinuous Galerkin time-domain (DGTD) method. It deals with two different material models: the hydrodynamic model for metals and the model for Raman-active dielectrics. In the first part, we review the hydrodynamic model for metals, where we apply a perturbative approach to the model. We use this approach to calculate the second-order nonlinear optical effects of second-harmonic generation and sum-frequency generation using the DGTD method. In this context, we will see how to optimize the second-order response of plasmonic nanoantennas by applying a deliberate tuning scheme for the optical excitations as well as by choosing an intelligent nanoantenna design. In the second part, we examine the material model for Raman-active dielectrics. In particular, we see how to derive the third-order nonlinear response by which one can describe the process of stimulated Raman scattering. We show how to incorporate this third-order response into the DGTD scheme yielding a novel set of auxiliary differential equations. Finally, we demonstrate the workings of the modified numerical scheme.
Yin, Xiaobo. "Optical nonspecular phenomena at the surface plasmon resonance and their applications /." May be available electronically:, 2008. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Full textMoraes, Eduardo Carlo Mascarenhas. "Collective and optical phenomena in equilibrium and nonequilibrium interacting quantum systems." Universidade Federal de Minas Gerais, 2014. http://hdl.handle.net/1843/BUOS-9TPHLT.
Full textSundaresan, Vignesh. "OPTICAL IMAGING AND MECHANISTIC STUDIES OF ELECTROCHEMICAL PHENOMENA AT THE NANOSCALE." Diss., Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/585694.
Full textPh.D.
In this work, we use optical methods to study electrochemical reactions and processes occurring on the nanometer length scale. Optical methods are advantageous over traditional electrochemical methods because of their high spatial resolution and sensitivity at both the single nanoparticle and single molecule level. This dissertation describes a series of studies in which super-localization and dark-field optical imaging is used to provide insight into spatial and temporal heterogeneity in nanoscale electrochemical systems with <25 nm spatial resolution. In the first set of experiments, three-dimensional (3-D) super-resolution imaging is used to determine the tip-substrate distance in nanoscale scanning electrochemical microscopy (SECM) with precision better than 25 nm. Correlating the tip-substrate distance using both optical and electrochemical techniques showed excellent agreement. Second, single nanoparticles (NP) were delivered through a nanopipette, and their resistive-pulse signals were correlated with a fluorescence optical signal. The diffusion trajectories of individual NP delivered to the external solution and to an electrified interface were obtained by 3-D super-resolution imaging, and showed signatures of both sub-diffusive and super-diffusive behavior, depending on the balance of forces between the flow from the pipette and the applied potential at the electrified substrate. Next, we studied the influence of surface oxide layers on single silver NP electrodissolution by tracking the intensity and spatial variation of scattering from single nanoparticles over time. We discovered that silver NPs can undergo electrodissolution in either a spatially symmetric or asymmetric manner, based on the nature of the surface oxide layer. Moreover, we also reported the simultaneous electrodeposition of silver oxide at the electrode surface during the electrodissolution of silver NPs, which enabled us to study the effect of multiple simultaneous redox reactions and their effects on one another. Overall, these experiments reveal local heterogeneity in nanoscale electrochemical processes and allow for many single nanoparticles to be measured in parallel, revealing relationships that are hidden using traditional electrochemical measurements.
Temple University--Theses
Närger, Ulrike. "Optical study of the critical behaviour of pure fluids and binary mixtures." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30786.
Full textScience, Faculty of
Physics and Astronomy, Department of
Graduate
Vanin, Evgeny V. "Nonlinear pulse propagation and staturation gain grating phenomena in optical fiber devices /." Stockholm, 1999. http://www.lib.kth.se/abs99/vani0318.pdf.
Full textPapageorgiou, Georgios. "Ultrafast nonlinear optical phenomena in wide-bandgap II-VI semiconductor quantum wells." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/2026.
Full textAbbas, Bassam. "Linear and nonlinear optical phenomena in thin sol-gel organic-inorganic films." Thesis, University of Reading, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298744.
Full textZwiggelaar, Reyer. "Coherence and polarisation phenomena in optical systems and fibres for signal processing." Thesis, University College London (University of London), 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319932.
Full textThacker, Vivek Vijay. "Optical studies of DNA nanostructures, electrokinetic phenomena and molecular transport in nanocapillaries." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708285.
Full textReed, Evan J. (Evan John) 1976. "Optical, electronic, and dynamical phenomena in the shock compression of condensed matter." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/16935.
Full textIncludes bibliographical references (leaves 109-113).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Despite the study of shock wave compression of condensed matter for over 100 years, scant progress has been made in understanding the microscopic details. This thesis explores microscopic phenomena in shock compression of condensed matter including electronic excitations at the shock front, a new dynamical formulation of shock waves that links the microscopic scale to the macroscopic scale, and basic questions regarding the role of crystallinity in the propagation of electromagnetic radiation in a shocked material. In Chapter 2, the nature of electronic excitations in crystalline solid nitromethane are examined under conditions of shock compression. Density functional theory calculations are used to determine the crystal bandgap under hydrostatic stress, uniaxial strain, and shear strain for pure and defective materials. In all cases, the bandgap is not lowered enough to produce a significant population of excited states. In Chapter 3, a new multi-scale simulation method is formulated for the study of shocked materials. The method allows the molecular dynamics simulation of the system under dynamical shock conditions for orders of magnitude longer time periods than is possible using the popular non-equilibrium molecular dynamics (NEMD) approach. An example calculation is given for a model potential for silicon in which a computational speedup of 10⁵ is demonstrated. Results of these simulations are consistent with some recent experimental observations. Chapters 4 and 5 present unexpected new physical phenomena that result when light interacts with a shock wave propagating through a photonic crystal.
(cont.) These new phenomena include the capture of light at the shock wave front and re-emission at a tunable pulse rate and carrier frequency across the bandgap, and bandwidth narrowing of an arbitrary signal as opposed to the ubiquitous bandwidth broadening. Reversed and anomalous Doppler shifts are also predicted in light reflected from the shock front.
by Evan J. Reed.
Ph.D.
Thota, Venkata Ramana Kumar. "Tunable Optical Phenomena and Carrier Recombination Dynamics in III-V Semiconductor Nanostructures." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1451807323.
Full textPorritt, Dawn, and n/a. "The magnificent play of light: seeing the difference." University of Canberra. Design and Architecture, 2007. http://erl.canberra.edu.au./public/adt-AUC20081023.115855.
Full textЯковенко, А. А. "Оптичні явища в природі та їх наукове пояснення." Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/40888.
Full textKalli, Kyriacos. "Investigation of linear and non-linear optical phenomena using high finesse ring resonators." Thesis, University of Kent, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314457.
Full textDimopoulos, C. "Study of dynamic phenomena in WDM optical fibre links and networks based on EDFAs." Thesis, University of Essex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327071.
Full textNagao, Kazuma. "Fluctuations and non-equilibrium phenomena in strongly-correlated ultracold atoms." Kyoto University, 2019. http://hdl.handle.net/2433/242588.
Full textFinke, Justin David. "Monte Carlo/Fokker-Planck simulations of Accretion Phenomena and Optical Spectra of BL Lacertae Objects." Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1181833339.
Full textReid, Benjamin A. "An optical investigation of cavitation phenomena in true-scale high-pressure diesel fuel injector nozzles." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6358.
Full textLai, Yu Hang. "Strong Field Phenomena in Atoms and Molecules from Near to MidInfrared Laser Fields." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1514852456303011.
Full textKarunanayaka, Prasanna Rasika. "A Dispersion Formula for Analyzing Modal Interference Among Guided and Free Electromagnetic Wave Modes and Other Phenomena in a Circular Optical Fiber." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100844976.
Full textJaník, Lukáš. "Podpůrný systém pro správu a řízení FSO transceiveru." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2016. http://www.nusl.cz/ntk/nusl-241040.
Full textQin, Yu. "Versatility of nonlinear optical phenomena induced by infrared pulses: application to pulse characterization, element analysis, and filamentation." Kyoto University, 2015. http://hdl.handle.net/2433/200464.
Full textPeil, Michael. "Dynamics and synchronization phenomena of semiconductor lasers with delayed optical feedback utilizing nonlinear dynamics for novel applications." Berlin Logos-Verl, 2006. http://deposit.ddb.de/cgi-bin/dokserv?id=2793060&prov=M&dok_var=1&dok_ext=htm.
Full textDhanjal, Sukhminder J. "Observations of transient nonlinear optical effects on reflection from opaque media and novel polarisation phenomena in crystals." Thesis, University of Southampton, 1999. https://eprints.soton.ac.uk/351450/.
Full textMondanos, Michael. "Characterisation and investigation of polarisation phenomena for application in all-in-line optical fibre sensing and communication systems." Thesis, Imperial College London, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419795.
Full textPohl, Martin [Verfasser], Ilya [Akademischer Betreuer] Akimov, and Heinz [Gutachter] Hövel. "Ultrafast optical phenomena in magneto-plasmonic crystals and magnetically ordered materials / Martin Pohl. Betreuer: Ilya Akimov. Gutachter: Heinz Hövel." Dortmund : Universitätsbibliothek Dortmund, 2014. http://d-nb.info/1105476111/34.
Full textRocha, Rafael Santos. "Influência do observador, do iluminante e do ângulo de visualização na perceptibilidade e aceitabilidade de diferenças de brilho superficial de resinas compostas." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152401.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O objetivo deste trabalho foi avaliar a influência de observadores sobre a percepção e aceitabilidade de brilho superficial de resinas compostas, sob diferentes iluminantes, em angulação livre e pré-determina em 60°. E ainda, determinar o limite de perceptibilidade e aceitabilidade da variação de unidade de brilho (∆UB) entre os espécimes. Foram confeccionados 8 espécimes cilíndricos de 6 mm de diâmetro e 1,5 mm de espessura de resina composta, bem como um espécime padrão de dente humano, com 0,5 mm de espessura em esmalte e 1 mm em dentina. Os espécimes receberam polimento a fim de que se obtivesse ao final do processo amostras com 10 UB, 20 UB, 30 UB, 40 UB, 50 UB, 60 UB, 70 UB e 80 UB e um padrão de dente humano de 80 UB. Foram selecionados 60 observadores (20 leigos, 20 alunos de graduação e 20 cirurgiões-dentistas). O estudo foi submetido e aprovado pelo comitê de ética local. Os participantes fizeram a qualificação do brilho superficial de resina composta em cabine de luz (Gti – Newburgh,NJ). Para tanto, as amostras foram posicionadas no interior da cabine, duas a duas de forma aleatória, de forma com que a luz incidisse sua superfície em um ângulo de 60°. Os observadores responderam perguntas específicas para se determinar o nível e limite de perceptibilidade das variações de brilho. Todas as análises foram realizadas em duas condições de iluminação, com iluminantes D65 e luz fluorescente. Cinquenta por cento dos observadores iniciaram as análises com ângulo de visualização livre, seguido da qualificação em angulação pré-definida em 60° e, os demais observadores fizeram as observações de forma oposta. Para o nível e limite de aceitabilidade da variação do brilho, as amostras foram individualmente comparadas com o padrão de dente humano. Os dados foram analisados pelo teste Modelo Generalizado Linear/Não-Linear PROBIT e regressão não-linear PROBIT (5%). Para a perceptibilidade, foram encontradas diferenças significantes para a variação de brilho (Δ UB) (p<0,001), para os observadores (p=0,043) e para os iluminantes (p<0,001), no entanto, não houve diferença entre o ângulo de visualização livre e fixo em 60° (p=0,303). Em relação à aceitabilidade, foram observadas diferenças significantes para a variação de brilho (Δ UB) (p<0,001), para os observadores (p=0,003), para os iluminantes (p=0,045) e no ângulo de visualização livre e fixo em 60° (p<0,001). Os limites de perceptibilidade e aceitabilidade, levando em consideração todos os fatores foi de 6,4 UB e 35,7 UB, respectivamente. Conclui-se que fatores rotineiramente encontrados em situações clínicas influenciam a perceptibilidade e aceitabilidade de diferenças de brilho superficial de resinas compostas e que apesar de perceberem limites menores de diferença de brilho, os observadores aceitam clinicamente diferenças cinco vezes maiores.
Panzer, Fabian [Verfasser], and Anna [Akademischer Betreuer] Köhler. "Understanding the impact of order-disorder phenomena on the optical properties of photoactive semiconducting materials / Fabian Panzer ; Betreuer: Anna Köhler." Bayreuth : Universität Bayreuth, 2016. http://d-nb.info/1115250280/34.
Full textHuynh, Dan-Nha [Verfasser], Kurt [Gutachter] Busch, Alejandro [Gutachter] Saenz, and Stephen K. [Gutachter] Gray. "Nonlinear optical phenomena within the discontinuous Galerkin time-domain method / Dan-Nha Huynh ; Gutachter: Kurt Busch, Alejandro Saenz, Stephen K. Gray." Berlin : Humboldt-Universität zu Berlin, 2018. http://d-nb.info/1185577904/34.
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