Dissertations / Theses on the topic 'Light interference'
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Shah, Samit Friedman Simon H. "Light activated RNA interference." Diss., UMK access, 2007.
Find full text"A dissertation in pharmaceutical science and chemistry." Advisor: Simon H. Friedman. Typescript. Vita. Description based on contents viewed July 16, 2008; title from "catalog record" of the print edition. Includes bibliographical references (leaves 206-220). Online version of the print edition.
Kim, Hyunsu. "Interference lithography with extreme ultraviolet light." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/410353/.
Full textWilson, Rebecca Anne. "The electron-beam tunable interference filter spatial light modulator." Thesis, Heriot-Watt University, 1992. http://hdl.handle.net/10399/1494.
Full textChen, Zhe. "Interference mitigation techniques for optical attocell networks." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/22868.
Full textBhattarai, Khagendra Prasad. "Interference of Light in Multilayer Metasurfaces: Perfect Absorber and Antireflection Coating." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6680.
Full textNoorizadeh, Sahand. "SLM-based Fourier Differential Interference Contrast Microscopy." PDXScholar, 2014. https://pdxscholar.library.pdx.edu/open_access_etds/2011.
Full textAllan, James Donald Campbell. "An application of optical interference to dynamic position measurement in three dimensions." Thesis, University of Edinburgh, 1988. http://hdl.handle.net/1842/6627.
Full textShankaranarayanan, N. K. "Mode-mode interference in optical fibers: analysis and experiment." Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/45891.
Full textInterference between the modes of an optical fiber generates specific mode (intensity) patterns which get modulated by disturbances in the optical fiber system. Mode-mode interference has been analyzed from first principles and a model based on differential phase modulation presented. Mode-mode interference effects such as intensity modulation of the mode patterns are directly related to differential phase modulation between modes which arises due to the difference between the propagation constants of the constituent modes. Practical implementation of modal methods involves selective launching of modes and processing of the output pattern to demodulate the information.
Axial strain has been chosen as the modulating mechanism in experiments designed to quantify mode-mode interference effects. Quasi-statically varying strain as well as vibrational strain was used to study 'dc' and 'ac' mechanisms. Specific mode combinations have been excited and their radiation patterns identified. Mode pattern changes have been described. Experimental observations and results correlate very well with analysis.
Master of Science
NAHM, KIEBONG. "LIGHT SCATTERING BY POLYSTYRENE SPHERES ON A CONDUCTING PLANE (MIE, IMAGE CHARGE, INTERFERENCE, BRDF)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188071.
Full textKim, Yang-Hyo. "High resolution imaging and lithography using interference of light and surface plasmon waves." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/42303.
Full textIncludes bibliographical references (leaf 28).
The resolution of optical imaging and lithography is limited by the wave nature of light. Studies have been undertaken to overcome the diffraction limit for imaging and lithography. In our lab, the standing wave surface plasmon resonance fluorescence (SW-SPRF) microscopy was developed. It is a combination of standing wave total internal reflection fluorescence (SW-TIRF), one of structured illumination techniques, with surface plasmon resonance (SPR). The SW-TIRF approach decreases the excitation wavelength by interfering two coherent light rays on the substrate and producing an evanescent standing wave field between the object and a high refractive index substrate. Evanescent standing wave illumination generates a sinusoidal interference pattern with 2n times higher-spatial frequency than original light, where n is the refractive index of the substrate allowing higher lateral resolution. Surface plasmon is generated by reflecting a light on the gold surface through the cover glass at a specific angle inducing collective excitation of electrons in the metal. The SPR contributes a better signal-to-noise ratio by inducing an enhanced evanescent electric field to excite fluorophores. With the SW-TIRF instrument, about 100 nm resolution was obtained. In this thesis, we aim to produce less than 50 nm resolution lithography and imaging using corrugated gold surface. The induction of surface plasmon wave with large wave number is made possible by the sinusoidal gold surface allowing wave number matching between the excitation light and the surface plasmon wave. This wave number matching requires proper optimization of parameters like grating constant, perturbation depth, incidence angle of the beam, and excitation wavelength. The fabrication of the corrugated gold surface would be done by e-beam etching with varying parameters.
(cont.) For lithography, nano-patterns would be investigated on azo dye thin films, Congo-Red dye with spin-coating, exposed by an interference of evanescent waves propagating on a substrate. The result patterns would be measured with AFM. For imaging, sub-diffraction limited fluorescent particle would be used for point spread function measurement and high-resolution demonstration.
by Yang-Hyo Kim.
S.M.
Gopalan, Kavitha. "The effects of continuous wave interference on Global Positioning System software radio processing." Ohio : Ohio University, 2001. http://www.ohiolink.edu/etd/view.cgi?ohiou1173895104.
Full textKim, Hyun-Su Verfasser], Larissa [Akademischer Betreuer] [Juschkin, and Thomas Günter [Akademischer Betreuer] Taubner. "Interference lithography with extreme ultraviolet light / Hyun-Su Kim ; Larissa Juschkin, Thomas Günter Taubner." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1162498153/34.
Full textKim, Hyun-Su [Verfasser], Larissa [Akademischer Betreuer] Juschkin, and Thomas Günter [Akademischer Betreuer] Taubner. "Interference lithography with extreme ultraviolet light / Hyun-Su Kim ; Larissa Juschkin, Thomas Günter Taubner." Aachen : Universitätsbibliothek der RWTH Aachen, 2016. http://d-nb.info/1162498153/34.
Full textLi, Qiaowu. "Examining the effectiveness of interactivity in a 3-dimensional web-based tutorial on interference phenomenon." Master's thesis, Mississippi State : Mississippi State University, 2002. http://library.msstate.edu/etd/show.asp?etd=etd-04092002-141428.
Full textLutkenhaus, Jeffrey Ryan. "Local Phase Manipulation for Multi-Beam Interference Lithography for the Fabrication of Two and Three Dimensional Photonic Crystal Templates." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc955084/.
Full textWEST, KAREN FRANCES. "AN EXTENSION TO THE ANALYSIS OF THE SHIFT-AND-ADD METHOD: THEORY AND SIMULATION (SPECKLE, ATMOSPHERIC TURBULENCE, IMAGE RESTORATION)." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188021.
Full textMathieson, Genevieve. "Thomas Young, Quaker Scientist." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1196288181.
Full textAydogdu, Selcuk. "Near Infrared Interference Filter Design And The Production Withion-assisted Deposition Techniques." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614092/index.pdf.
Full textDyck, Tobias [Verfasser], Uwe [Akademischer Betreuer] Rau, and Andres Fabian [Akademischer Betreuer] Lasagni. "Light trapping by light treatment : direct laser interference patterning for the texturing of front contacts in thin-film silicon solar cells / Tobias Dyck ; Uwe Rau, Andres Fabian Lasagni." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://nbn-resolving.de/urn:nbn:de:101:1-2018071608004058241947.
Full textDyck, Tobias Verfasser], Uwe [Akademischer Betreuer] [Rau, and Andres Fabian [Akademischer Betreuer] Lasagni. "Light trapping by light treatment : direct laser interference patterning for the texturing of front contacts in thin-film silicon solar cells / Tobias Dyck ; Uwe Rau, Andres Fabian Lasagni." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1162845805/34.
Full textŠevčík, Michal. "Nanometrologická vibrometrie." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220217.
Full textKlempner, Adam R. "Development of a modular interferometric microscopy system for characterization of MEMS." Link to electronic thesis, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-010407-173332/.
Full textKeywords: vacuum; shape and deformation measurement; MEMS; vibrometry; scanning white light; Interferometry; thermal; vibration. Includes bibliographical references (136-139 leaves ).
Bita, Ion. "Breaking symmetries in ordered materials : spin polarized light transport in magnetized noncentrosymmetric 1D photonic crystals, and photonic gaps and fabrication of quasiperiodic structured materials from interference lithography." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36205.
Full text"February 2006."
Includes bibliographical references.
Effects of breaking various symmetries on optical properties in ordered materials have been studied. Photonic crystals lacking space-inversion and time-reversal symmetries were shown to display nonreciprocal dispersion relations, and to exhibit a remarkable set of symmetry-related properties. Even in 1D, these materials are found to display indirect photonic band gaps, backward wave propagating modes (antiparallel phase and group velocities) which enable negative refraction at the air-crystal interface, ability to allow bending light with perpendicular magnetic fields, unidirectional superprism effects, etc. By calculating the complex photonic band structure, we show that the gap modes differ fundamentally from the commonly assumed evanescent modes with purely imaginary wave vectors - solely due to symmetry, we show that the gaps of nonreciprocal photonic crystals have complex wave vectors with both imaginary components and non-zero, frequency dependent real components. This basic finding is further studied in the context of tunneling dynamics, by considering the problem of tunneling time for nonreciprocal photonic band gap barriers (the tunneling wave packet has an energy in the middle of the gap).
(cont.) It was found that the classical Hartman effect (independence of tunneling time on barrier length, beyond a certain length), previously implied as universal, is forbidden solely due to symmetry. Instead of a classical zero group delay, we find that tunneling wave packets with opposite spins display non-zero group delays, with opposite signs. Due to analogies based on symmetry, these results directly impact the problem of spin-polarized electronic tunneling in magnetized noncentrosymmetric semiconductors, such as GaMnAs or carbon nanotubes with applied axial magnetic fields. An interference lithography based fabrication process was developed to produce 2D and 3D quasiperiodically structured materials, which have long-range order but break translational symmetry. Multiple exposure interference lithography was used to fabricate 2D quasicrystals with feature sizes as small as 100nm. Replica molding was used to fabricate transparent and conformable 2D quasiperiodic phase masks, which subsequently allowed the fabrication of 3D structured materials with quasiperiodicity by coherent diffraction lithography. The effect of the higher point group symmetries of 2D quasicrystals on photonic band gap formation (TM polarized only) was studied by finite difference time domain calculations, and it was found that increasing the rotational symmetry does not always lead to wider gaps.
by Ion Bita.
Ph.D.
Yin, Liang. "Design and performance analysis of optical attocell networks." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31390.
Full textRudhall, Andrew Peter. "Ultrashort laser pulse shaping for novel light fields and experimental biophysics." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3682.
Full textSmith, Michael Hughes. "The design of multifunctional hydrogel nanoparticles for drug delivery." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43609.
Full textKozyreff, Gregory. "Nonlinear aspects of the dynamics induced by dissipative light-matter interaction." Doctoral thesis, Universite Libre de Bruxelles, 2001. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211644.
Full textMotivé par de récentes expériences menées sur des lasers miniatures avec absorbant saturable, nous en avons repris la description théorique. Les nouvelles valeurs de paramètres suggérées par l'expérience nous ont amenés à découvrir de nouveaux comportements dynamiques pour ces systèmes. En particulier, nous avons décrit comment l'intensité délivrée par ces lasers devenait temporellement sinusoïdale, puis impulsionnelle sur un très petit intervalle de paramètres.
Par la connaissance acquise du laser à absorbant saturable, nous avons pu comprendre comment s'établissait un régime impulsionnel semblable dans un autre laser. Il s'agissait du laser multimode à pompage longitudinalement inhomogène. Il est apparu en effet qu'une partie du milieu emprisonné dans la cavité optique agissait à la manière d'un absorbant saturable, déstabilisant ainsi l'émission continue de ce laser. Nous avons également montré que, dans certaines circonstances, son état dynamique présentait des effets de mémoire. Une autre propriété importante de la dynamique du laser multimode a été mise en évidence: pour de petites perturbations, l'intensité totale présente un comportement plus régulier que les intensités modales prises séparément.
Ce type intrigant d'auto organisation fut rencontré plus tard, lorsque nous avons envisagé la dynamique d'un réseau de lasers à semi conducteur couplés par un feedback optique. Le retard accumulé par la lumière au cours de ce feedback est un paramètre essentiel du problème. Ce système important sur le plan technologique s'est révélé extrêmement riche sur le plan dynamique. Nous avons pu montrer que plus le retard était grand, plus les lasers avaient tendance à se synchroniser. Cela fut observé aussi bien en régime continu qu'en régime périodique ou chaotique. Par une telle synchronisation, la qualité du rayon optique émis par le réseau de lasers augmente spectaculairement, élargissant par là ses possibilités d'application.
Au début des années 1990, les physiciens commencèrent à étudier systématiquement les effets d'interférence quantique dans l'interaction lumière matière. Ceci faisait suite à l'annonce fracassante que de tels effets devaient permettre de construire des lasers sans inversion de population. Récemment, une série d'expériences a montré que de telles interférences quantiques étaient à l’œuvre dans le laser miniature LNP. Une partie de cette thèse y fut consacrée. Nous avons montré que le comportement dynamique observé résultait d'un renforcement quantique de l'absorption stimulée par les niveaux énergétiques inférieurs.
Nous avons poursuivi notre étude des effets d'interférence quantique sur un schéma électronucléaire. Nous avons montré que pour ce système, un rayon gamma peut être amplifié sans inversion de population. Ce résultat est très important, compte tenu du fait qu'une telle inversion est techniquement impossible à réaliser pour ces très hautes fréquences électromagnétiques, empêchant jusqu'ici la réalisation de lasers gamma. Afin d'atteindre l'amplification sans inversion, un rayonnement d'appoint dans le domaine optique s'avère nécessaire. Tenant compte de la décroissance de ce champ optique en cours de propagation, et donc de la diminution des effets quantiques associés, nous avons déterminé une distance optimale de propagation. Au-delà de cette distance, l'amplification se mue en absorption. Une telle information est dès lors cruciale sur le plan expérimental.
Doctorat en sciences appliquées
info:eu-repo/semantics/nonPublished
Gesualdi, Marcos Roberto da Rocha. "Estudo de materiais fotorrefrativos e suas aplicações no processamento óptico holográfico de informação." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-28022014-112020/.
Full textThe Study of Photorefractive Materials and their Applications in Optical and Holographical Information Processing come being made for diverse Groups of Research in some laboratories due to the good results in many areas. Among other photo-induced effects, the process that allows these applications is the photorefractive effect, a phenomenon where the holographic recording in photorefractive medium occurs by means of the refractive index modulation due to the space distribution of the light intensity, producing a space-charge photo-induced redistribution, and consequently, the generation of a space-charge field governed by an electro-optic medium. In this work, we study the propagation and coupling of electromagnetic waves in electro-optic monocrystals of the sillemite family Bi12SiO20 (BSO) and Bi12TiO20 (BTO) and in the pure and dop-ed LiNbO3 crystals. The purpose to study these materials is to characterize them and, mainly, to optimize the conditions of their application in the optical and holographical information processing. We use photorefractive holographic gratings and photo-induced lens techniques for determination of figures of merit and photorefractive and thermo-optic parameters in these photorefractive materials. We also consider some applications in the optical and holographical information processing in the research basic, technological and biomedical areas, that come waken great interest in the last years, as phase- shifting real-time holography, real-time speckle interferometry and non-holographic recording with incoherent-incoherent conversion process; among others in the optic and holographic data processing.
Zanzi, Andrea. "Passive and active silicon photonics devices at TLC telecommunication wavelengths for on-chip optical interconnects." Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/149377.
Full text[ES] Las tecnologías ópticas son el eje vertebrador de los sistemas de comunicación mod- ernos que proporcionan acceso de alta velocidad a la Internet, interconexiones efi- cientes entre centros de datos y dentro de ellos. Además, se están expandiendo hacia campos de investigación crecientes y nuevos mercados como son las aplicaciones de comunicaciones por satélite, los LIDAR (Laser Imaging Detection and Ranging), la computación neuromórfica y los circuitos fotónicos programables, por nombrar algunos. La fotónica de silicio está considerada y aceptada ampliamente como una de las tecnologías clave para que dichas aplicaciones puedan desarrollarse. Como resultado, hay una fuerte necesidad de estructuras fotónicas básicas integradas que sean innovadoras, que soporten altas velocidades de transmisión y que sean más eficientes en términos de consumo de potencia, a fin de aumentar la capacidad de los circuitos integrados fotónicos de silicio. El trabajo desarrollado y presentado en esta tesis se centra en el diseño y la car- acterización de dispositivos avanzados pasivos y activos, para circuitos fotónicos integrados. La tesis consta de tres capítulos principales, así como de sendas sec- ciones de motivación y conclusiones que exponen los fundamentos y los logros de este trabajo. El capítulo uno describe el diseño y la caracterización de un modulador electro-óptico Mach-Zehnder incorporado en una unión pn vertical altamente eficien- ciente que explota el efecto de dispersión de plasma en banda O. El capítulo dos está dedicado al diseño y caracterización de una nueva geometría de dispositivo de interferencia multimodo asimétrico y su aplicación en un modulador Mach-Zehnder. El capítulo tres está dedicado al diseño y caracterización de innovadores cristales fotónicos unidimensionales para aplicaciones de modulación con luz lenta. Se pre- senta un amplio análisis de los principales retos derivados del uso de la misma.
[CA] Les tecnologies òptiques són l'eix vertebrador d'aquells sistemes de comunicació moderns que proporcionen accés d'alta velocitat a la Internet, així com intercon- nexions eficients inter i entre centres de dades. A més a més, s'estan expandint cap a camps d'investigació creixents i nous mercats com són les aplicacions de co- municacions per satèl·lit, els LIDAR (Laser Imaging Detection and Ranging), la computació neuromòrfica i els circuits fotònics programables, entre d'altres. La fotònica de silici és considerada i acceptada àmpliament com una de les tecnologies clau i necessàries perquè aquestes aplicacions puguen desenvolupar-se. Per aquest motiu, es fa necessària l'existència d'estructures fotòniques bàsiques integrades que siguen innovadores, que suporten altes velocitats de transmissió i que siguen més eficients en termes de consum de potència, a fi d'augmentar la capacitat dels cir- cuits integrats fotònics de silici. El treball desenvolupat i presentat en aquesta tesi se centra en el disseny i la caracterització de dispositius avançats passius i actius, per a circuits fotònics integrats. La tesi consta de tres capítols principals, així com d'una secció de motivació i una altra de conclusions que exposen els fonaments i els assoliments d'aquest treball. El capítol u descriu el disseny i la caracterització d'un modulador electro-òptic Mach-Zehnder incorporat en una unió pn vertical d'alta efi- ciència que explota l'efecte de dispersió de plasma en la banda O. El capítol dos està dedicat al disseny i caracterització d'una nova geometria de dispositiu d'interferència multimode asimètric així com a la seua aplicació en un modulador Mach-Zehnder. El capítol tres està dedicat al disseny i caracterització d'innovadors cristalls fotònics unidimensionals per a aplicacions de modulació amb llum lenta. S'inclou també una anàlisi detallada dels principals reptes derivats de l'ús d'aquest tipus de llum.
I want to thank you the Generelitat Valenciana and the European Project L3MATRIX for the funding, without them my doctorate would not taken place.
Zanzi, A. (2020). Passive and active silicon photonics devices at TLC telecommunication wavelengths for on-chip optical interconnects [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/149377
TESIS
Avila, Luis Fernando de 1980. "Estudo de materiais fotossensíveis utilizando exposições holográficas." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278205.
Full textTese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
Made available in DSpace on 2018-08-15T19:36:27Z (GMT). No. of bitstreams: 1 Avila_LuisFernandode_D.pdf: 1824665 bytes, checksum: 6cab44933ac386ebd3097bd193d85e0f (MD5) Previous issue date: 2010
Resumo: Materiais fotossensíveis são materiais que sofrem alterações físico-químicas quando expostos à luz de comprimento de onda apropriado. A gama de aplicações para estes materiais é enorme, entre elas as que apresentam maiores exigências em termos do próprio material são as aplicações em armazenagem de informação e imagens. Para avaliar o potencial de um material para uma dada aplicação é necessário entender os mecanismos fotossensíveis envolvidos assim como caracterizar suas propriedades, tais como: sensibilidade espectral, modulação óptica máxima, reversibilidade, estabilidade térmica, etc. Nesta tese de doutorado foi proposto e demonstrado um método para processar os sinais de auto-difração que, além de permitir a medida simultânea e independente das modulações de índice de refração e de coeficiente de absorção, nos permite medir a evolução temporal das modulações e a constante cinética das reações fotossensíveis. Esta técnica foi utilizada para estudar três tipos de materiais fotossensíveis: fotorresinas positivas (SC 1827 da Shipley), fotorresinas negativas (SU-8 da Microchem) e vidros calcogenetos (em particular composições com Sulfeto de Antimônio). As medidas foram realizadas utilizando-se dois interferômetros diferentes: um com óptica para o visível e outro para o ultravioleta. Além disso, foi observada uma modulação de elétrons secundários nas imagens de microscopia eletrônica de amostras de fotorresinas negativas SU8 expostas holograficamente
Abstract: Photosensitive materials are materials that change their optical properties when exposed to light of appropriate wavelength. The range of applications of such materials is very wide. Among these applications the storage of images and information is that present higher requirements in terms of the material itself. To evaluate the potential of a material for a given application it is necessary to understand the mechanisms involved as well as to characterize their photosensitive properties such as spectral sensitivity, maximum optical modulation, reversibility, thermal stability, etc. In this thesis we propose and demonstrate a method for processing the selfdiffraction the signals that allows the simultaneous and independent measurement of the modulations of refractive index and absorption coefficient as well as to measure the temporal evolution of such modulations and their corresponding kinetic constant of the photo-reactions. This technique was employed to study three types of photosensitive materials: positive photoresist (SC 1827 from Shipley), negative photoresist (Microchem SU-8) and chalcogenide glasses (in particular compositions with Antimony Sulfide). Measurements were performed using two different interferometers, one with optics for the visible and one for the ultra-violet. Moreover, a modulation of secondary electrons was observed in the electronic microscopy images of the SU8 negative photoresist samples exposed holographically
Doutorado
Ótica
Doutor em Ciências
Blecha, Martin. "Pracoviště pro optickou interferometrii." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217262.
Full textGao, Ying. "A Digital Signal Processing Approach for Affective Sensing of a Computer User through Pupil Diameter Monitoring." FIU Digital Commons, 2009. http://digitalcommons.fiu.edu/etd/132.
Full textOppel, Steffen [Verfasser], and Joachim von [Akademischer Betreuer] Zanthier. "Multi-Photon Interferences of Independent Light Sources / Steffen Oppel. Betreuer: Joachim von Zanthier." Erlangen : Universitätsbibliothek der Universität Erlangen-Nürnberg, 2013. http://d-nb.info/1029869383/34.
Full textXi, Xiaojun. "New Stochastic Geometry Approaches to the Modeling and Analysis of Low and High Frequency Wireless Communication Networks." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS556.
Full textIn this thesis, we have developed new analytical frameworks for analyzing and optimizing future cellular networks with the aid of stochastic geometry and point processes. This thesis provides four main technical contributions.First, we analyze emerging networks that can communicate by using light instead of radio waves. In this context, we propose an innovative analytical framework that allows us to estimate the coverage probability and the average rate of spatially distributed networks, which are used to gain insight for system optimization.Second, we propose an innovative methodology for modeling spatially correlated cellular networks by using inhomogeneous point processes. The proposed approach is tested against practical deployment of cellular networks and found to be tractable and accurate. It is applied to the analysis of visible light communication networks, and the impact of spatial correlation is studied.Third, we tackle the open problem of modeling Massive MIMO cellular networks. We study uplink and downlink cellular networks and propose new upper and lower bounds for the average spectral efficiency, which allow us to identify the optimal number of user to serve in each cell of the network and the impact of several key system parameters.Fourth, we introduce and analyze the performance of a new interference-aware scheduling algorithm for application to the uplink of cellular networks. The proposed approach is based on muting some users in order to reduce the level of interference. The achievable performance and the user-fairness of the proposed approach are discussed and quantified analytically
Puthumpally, Joseph Raijumon. "Quantum Interferences in the Dynamics of Atoms and Molecules in Electromagnetic Fields." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS035/document.
Full textQuantum interference, coherent superposition of quantum states, are widely used for the understanding and engineering of the quantum world. In this thesis, two distinct problems that are rooted in quantum interference are discussed with their potential applications: 1. Laser induced electron diffraction (LIED) and molecular orbital imaging, 2. Collective effects in dense vapors and dipole induced electromagnetic transparency (DIET). The first part deals with the recollision mechanism in molecules when the system is exposed to high intensity infrared laser fields. The interaction with the intense field will tunnel ionize the system, creating an electron wave packet in the continuum. This wave packet follows an oscillatory trajectory driven by the laser field. This results in a collision with the parent ion from which the wave packet was formed. This scattering process can end up in different channels including either inelastic scattering resulting in high harmonic generation (HHG) and non-sequential double ionization, or elastic scattering often called laser induced electron diffraction. LIED carries information about the molecule and about the initial state from which the electron was born as diffraction patterns formed due to the interference between different diffraction pathways. In this project, a method is developed for imaging molecular orbitals relying on scattered photoelectron spectra obtained via LIED. It is based on the fact that the scattering wave function keeps the memory of the object from which it has been scattered. An analytical model based on the strong field approximation (SFA) is developed for linear molecules and applied to the HOMO and HOMO-1 molecular orbitals of carbon dioxide. Extraction of orbital information imprinted in the photoelectron spectra is presented in detail. It is anticipated that it could be extended to image the electro-nuclear dynamics of such systems. The second part of the thesis deals with collective effects in dense atomic or molecular vapors. The action of light on the vapor samples creates dipoles which oscillate and produce secondary electro-magnetic waves. When the constituent particles are close enough and exposed to a common exciting field, the induced dipoles can affect one another, setting up a correlation which forbids them from responding independently towards the external field. The result is a cooperative response leading to effects unique to such systems which include Dicke narrowing, superradiance, Lorentz-Lorenz and Lamb shifts. To this list of collective effects, one more candidate has been added, which is revealed during this study: an induced transparency in the sample. This transparency, induced by dipole-dipole interactions, is named “dipole-induced electromagnetic transparency”. The collective nature of the dense vapor excitation reduces the group velocity of the transmitted light to a few tens of meter per second resulting in 'slow' light. These effects are demonstrated for the D1 transitions of 85Rb and other potential applications are also discussed
Claveau, Rémy. "Caractérisation spectrale locale à l'aide de la microscopie interférométrique : simulations et mesures." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAD037/document.
Full textWhite light interference microscopy is a measurement method based on the acquisition and processing of the signal coming from the interaction between two wave fronts, known as the “object” and “reference” wave-fronts. These waves come from the reflection of the light on a reference mirror and the sample studied. Usually used for topographic or tomographic analysis of a sample, the interferometric data can be exploited for spectroscopic purposes. The resulting spectral characterizations are spatially resolved in the three directions of space. In this project, we have studied the performance of this technique, as well as the associated limitations when the sample becomes more complex (degradation of the interferometric signal). The analysis has been first applied to reflective materials for surface measurements and subsequently to transparent and scattering layers for probing within the depth of the medium and then extracting the individual spectral response of the buried structures
Bookjans, Eva M. "Relative number squeezing in a Spin-1 Bose-Einstein condensate." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37148.
Full textRogosch, Dorothee. "Depletion des Myc-interagierenden Zinkfingerproteins 1 mittels RNA-Interferenz und die Rolle von Miz-1 in der zellulären DNA-Schadensantwort auf UV-Licht." [S.l.] : [s.n.], 2006. http://archiv.ub.uni-marburg.de/diss/z2006/0290.
Full textLi, Cheng Han, and 李丞瀚. "An Adaptation Scheme to Ambient Light Interference for Visible Light Communication Link." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/87746619335013252081.
Full textCoetzee, Annaretha. "Alternative conceptions concerning interference and diffraction of light." Thesis, 1998. http://hdl.handle.net/10539/22841.
Full textThe aim of this study was to determine whether alternative conceptions about interference and diffraction do indeed exist, to identify the most important of these conceptions and to determine whether these conceptions relate to textbooks, as one of the main sources of students' knowledge. An analysis of secondary level textbooks and tertiary level non-calculus textbooks revealed that presentations of constructive and destructive interference, diffraction and other related aspects are treated inconsistently and in some cases contradictorily by different authors. The research instrument was a Physical Optics test which Physics students of the Technikon Pretoria wrote. This test revealed that alternative conceptions on elementary principles of interference and diffraction of light do exist and that they relate to textbook presentations. This study reveals that (i) the terms in phese and out of phase are not consistently used in different textbooks; (ii) the definitions of constructive and destructive interference in terms of phases cause major aiternative conceptions, (iii) the interrelation between interference and diffraction is not clarified.
AC2017
Coetzee, Annaretha. "Alternative conceptions concerning interference and diffraction of light." Thesis, 2014.
Find full textThe aim of this study was to determine whether alternative conceptions about interference and diffraction do indeed exist, to identify the most important of these conceptions and to determine whether these conceptions relate to textbooks, as one of the main sources of students’ knowledge. An analysis of secondary level textbooks and tertiary level non-calculus textbooks revealed that presentations of constructive and destructive interference, diffraction and other related aspects are treated inconsistently and in some cases contradictorily by different authors. The research instrument was a Physical Optics test which Physics students of the Technikon Pretoria wrote. This test revealed that alternative conceptions on elementary principles of interference and diffraction of light do exist and that they relate to textbook presentations. This study reveals that (i) the terms in phase and out of phase are not consistently used in different textbooks; (ii) the definitions of constructive and destructive interference in terms of phases cause major alternative conceptions; (iii) the interrelation between interference and diffraction is not clarified.
Chen, Shin Hung, and 陳信宏. "Interference patterns in the spectra of light-emitting diode." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/64322518029686233450.
Full text長庚大學
光電工程研究所
98
This work studies the interference patterns surface and edge spectra of AlGaInP and nitride light-emitting diodes device. By measuring surface and backside spectra of nitride sample, we discover the phenomenon of interference patterns spectra does not cause by filtering effect. The interference is attributed to the modulation of the spontaneous emission rather than the filtering effect of an optical thin film. We also discover the spontaneous emission rates are controllable. The radiation rate can be tune through the change of the optical field distribution. We cannot utilize the EM wave solution of Maxwell equation to describe the spontaneous emissions. Therefore, by measuring the photocurrent and emission spectra of AlGalnP device know the structural corresponding to the absorption and emission rate. At the same time, we also simulate the optical field distribution of EM wave. When the quantum well electron-hole pair dipole formed interaction strongly with the optical field, the absorption rate of EM waves are enhanced, the emission rate are enhanced too. On the other hand, the emission rates decrease follow the optical fields reduce. In conclusion, we know the modulation of emission spectra is the interference patterns. We know the attribution of surface interference spectra and base on the theorem to measure the spectra of vary angle of nitride sample. We find the edge spectra of nitride are attributed to the surface high angle equivalent interference patterns. And the interference patterns cycle increase with the emission angle. The result corresponds with the simulation and also demonstrates the optical resonator model
Shi, Sheng-Wen, and 施勝文. "Line-scan profilometer using broadband light source interference pattern." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/4kaz3t.
Full text國立臺北科技大學
光電工程系研究所
105
This research proposes a line-scan profilometer using broadband light source interference pattern. It containsan interference module, a stage, an object under test, and a light detection module. Wherein, the interference module projects a broadband source interference pattern on the object, the light detection module captures the image of the projection, and the profilometer reconstructs the contours of the object by examining the displacement of the zeroth-order fringe of the interference pattern while the object is scanned vertically orthe interference pattern is shifted transversely. This research also verifies the profilometer using experiments, the results not only confirm its validity but also exhibit a high measurement repeatability.
Shen, Yen-Jie, and 沈彥傑. "Measuring step height by using Linnik type low coherent light interference." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/13390596906328173032.
Full text明道大學
光電暨能源工程學系碩士班
99
The purpose of the work was to set up a microscopy interferometer and measuring step height by using low coherence light interferometry . A Super Luminescent Diode, SLD was used as the light source , and the center wavelength of SLD is 844.8 nm and coherence length is 15.38 μm . A Linnk type microscope interferometer was set up , and the interference fringe ‘s variation was measured while shifting the sample by PZT. The interference fringe was analyzed by using Fourier Transform Method to obtain the step height , and it was discovered that while the samples with thin film and step height , the step height and the thickness of the thin film could be determined simultaneously. In conclusion, we discovered that the image of the sample could be viewed by using the Linnk type microscope interferometer set up in this research
CHUNG, I.-HAO, and 鍾宜豪. "Wide-field White-light Interference Microscopy for 3D Color Surface Measurement." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/87cfck.
Full text逢甲大學
光電學系
106
In this study, we have successfully extended the capability of traditional scanning white-light interference microscopy (SWIM) to wide-field 3D color surface measurement. The new SWIM system uses a color CCD to record interference images. The outputs of the CCD are three RGB interferograms. In order to maintain high axial resolution, the RGB interference images are combined to generate one white-light interferogram. The surface profile of a tested sample is restored via vertical scanning and centroid methods. The colors of the sample are the average values of RGB interference signals near zero optical path difference. The field of view is broadened by stitching many surface-profiles together. Every two adjacent fields overlap partially. The heights of the overlapped regions are corrected according to plane-fitting results. Finally, we use least root-mean-square error of the height difference between the overlapped areas for determining the offset along X and Y directions of two adjacent fields. 3×3-field measurements with this new SWIM were performed on multiple samples, the system is proved very effective in measuring wide-field 3D color surface. The measurement area is increased by 6 times compared with the conventional white-light interference microscope.
Su, Yuan-Jun, and 蘇緣峻. "Interference Rejection Using Filter-Based Sensor Array for Visible Light Communication Systems." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/933647.
Full text國立臺北科技大學
電機工程系所
99
The goal of this thesis is to research into multi-antenna diversity techniques for spectrum sensor array receiver in visible light communication systems and to improve the performance of this system. Conventionally, photoelectric-diodes are implemented to convert optical signals into electronic signals. Since conventional photoelectric-diodes cannot distinguish inputs of different spectra, using conventional photoelectric-diodes have the disadvantage that the system is vulnerable to interference and noise, and hard to achieve wavelength division multiplexing (WDM) for light sources of different wavelengths. In this work, a spectrum sensor array is proposed to be implemented on the receiver side to achieve interference and noise rejection. By proper design of the weightings for individual spectrum sensor, the effective output signal-to-noise ratio (SNR) or signal-to-interference ratio (SIR) or signal-to-interference-plus-noise ratio (SINR) can be maximized. Following the concept of multi-antenna communication systems, signal fusion algorithms include maximum SINR combining (MSC), maximum ratio combining (MRC), equal gain combining (EGC), selection combining (SC) and matched filter combining (MFC) are presented. The simulation results demonstrate robust interference and noise rejection is made possible using the low-cost spectrum sensor array.
"Optical Simulation and Optimization of Light Extraction Efficiency for Organic Light Emitting Diodes." Master's thesis, 2016. http://hdl.handle.net/2286/R.I.38677.
Full textDissertation/Thesis
Masters Thesis Mechanical Engineering 2016
Huang, Yung-Kuo, and 黃永國. "Inspection of 3D Profile and Internal Structure with Polarized Low Coherent Light Interference Microscope." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/93011580853076290987.
Full text國立中正大學
機械工程所
94
Abstract In this paper, we set up a polarized sensitivity optical coherence tomography microscope (PS-OCM) of Linnik type. This PS-OCM was modified mechanism of the reference arm in order to compensate the difference of optical path. So the microscope can achieve the function of white light interference microscope (WLI), virtual confocal microscope and the PS-OCM. The resolution of WLI reached to nanometers scale. So it is indispensable to MENS or semiconductor manufacture procedure. The optical tomography had the functions which was transparent material internal structure measured and bio-tissue internal imaging. Therefore, it was increasingly attach importance to field of optical inspection except field of biotechnology. Additionally, OCM will inspect the birefringence, when the OCM used the polarization light source. Inspection of 3D profile with this PS-OCM, we developed a new scanning algorithm. This algorithm combined Hilbert transform to search the zero order fringe of the interferogram. And measure a 3D profile standard to prove the correctness of the algorithm. The PS-OCM can execute the function of microscope, and this paper develops a virtual confocal algorithm. Use this algorithm, the PS-OCM except inspected 3D profile and provide the full depth of field image of the sample. The PS-OCM can measure the internal structure of transparent material which operated with the mechanism of optical difference compensated. And the paper drove an equation of optical difference compensated which regulated the displacement of the compensation mechanism. Because, the sample arm of the PS-OCM would be longer when focus fall in transparent material internal. So, this PS-OCM is unrestricted with the depth of field of objective on the depth of measurement. Finally, we demonstrate a measurement of the stress induce birefringence with the PS-OCM.
楊音光. "Design and development of real-time light shape monitor system of laser interference lithography." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/44974939267411994160.
Full text徐世雄. "A Study of White Light Interference Detection System Based on Texture Analysis and Fuzzy Theory." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/49987220331287206316.
Full text國立交通大學
電控工程研究所
99
Among the many high-tech industries, such as semiconductors, flat panel displays, optical communications, MEMS, biomedical and electronic packaging, the micro-structure of the surface contour determines the accuracy of product performance and function in its manufacturing process units are required for the micro- structure of the surface contour to conduct quality monitoring. As most of the three-dimensional white light interferometer detection system algorithms, most only consider the fixed relationship between the pixels in each image, that is, taking into account only the vertical direction, so there is no perfect approach to the use of white light interference of the texture features. Discussed in this paper three-dimensional white light interferometer detection system algorithms, taking into account the use of white light interference of regional texture features, the use of texture analysis, image processing and fuzzy theory can filter the data points in addition to non-interference effects, and reduce errors caused by noise height data. Capability of vertical resolution up to 0.1μm, measured repeatedly degrees up to 2μm, and have a variety of detection for the off poor height, angle, area, volume, coarse degree, ups and downs as well as film thickness and other requirements, to provide a sperm does the testing program .