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Dissertations / Theses on the topic '3 photons'

Author: Grafiati
Published: 18 May 2024

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1

Telliez, Cécile. "Advanced optical microscopy for spatially and temporally precise deep brain interrogation." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS041.

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Dans le domaine des neurosciences, l'avènement des outils optogénétiques sensibles à la lumière a ouvert de nouvelles opportunités pour contrôler précisément l'activité neuronale et étudier le fonctionnement cérébral optiquement. En optique, cela a motivé le développement de diverses stratégies d'illumination et de collecte de la lumière pour imager l'activité neuronale et la manipuler avec une précision spatiotemporelle élevée. En particulier, les approches de mise en forme de la lumière, telles que l'holographie générée par ordinateur combinée à la focalisation temporelle, ont permis de cibl
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2

Hayward, Robert M. "A coarse mesh transport method for photons and electrons in 3-D." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/51928.

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A hybrid stochastic-deterministic method, COMET-PE, is developed for dose calculation in radiotherapy. Fast, accurate dose calculation is a key component of successful radiotherapy treatment. To calculate dose, COMET-PE solves the coupled Boltzmann Transport Equations for photons and electrons. The method uses a deterministic iteration to compose response functions that are pre-computed using Monte Carlo. Thus, COMET-PE takes advantage of Monte Carlo physics without incurring the computational costs typically required for statistical convergence. This work extends the method to 3-D problems wi
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3

Grootoonk, Sylke. "Dual energy window correction for scattered photons in 3-D positron emission tomography." Thesis, University of Surrey, 1995. http://epubs.surrey.ac.uk/844524/.

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In the past few years, the collection of positron emission tomography (PET) data without inter-plane shielding has become a widely accepted technique for significantly increasing the sensitivity of multi-ring scanners. However, the resultant increase in the registration of counts due to scattered events is undesirable for quantitative studies, since it reduces contrast and confounds the linear response of the scanner to activity concentration. This thesis describes the development, implementation and evaluation of a correction for scattered photons based on the simultaneous acquisition of emis
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4

Bouhadida, Maha. "Étude d’effets optiques non linéaires d’ordres 2 et 3 dans des nanofibres optiques." Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPASP019.

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Cette thèse de doctorat porte sur l'étude d'effets optiques non linéaires d’ordres 2 et 3 dans des nanofibres optiques de silice qui sont des fibres optiques étirées jusqu'à atteindre des diamètres de l'ordre de la longueur d'onde.La première application étudiée est la réalisation de convertisseurs de longueur d’onde dans le visible en régime sub-nanoseconde, domaine peu couvert par les sources impulsionnelles actuelles. Le principe de ces convertisseurs repose sur la diffusion Raman stimulée dans le champ évanescent d’une nanofibre optique de silice baignée dans un liquide. En définissant et
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5

GRISCOM, LAURENT. "Synthese et proprietes optiques des verres de chalco-halogenures : spectroscopie a 1,3 microns et addition de photons des ions nd 3 + et pr 3 +." Rennes 1, 1999. http://www.theses.fr/1999REN10191.

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Des sources lumineuses sont, a ce jour activement recherchees a 1,3 m pour augmenter la capacite des reseaux de telecommunications par fibres optiques. Pour cela, des compositions de verres dopes aux terres rares et optimises du point de leurs proprietes optiques sont necessaires. Les verres de chalcogenures ayant des indices de refraction eleves et une transparence dans l'infrarouge qui s'etend au-dela de 10 m possedent les qualites necessaires pour operer a cette longueur d'onde. Les verres de chalco-halogenures, avec les elements ge-ga-s-csx ou x = c1, br, i ont ete synthetise au laboratoir
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Harlé, Thibault. "Sources fibrées de paires de photons : caractérisation et influence de la non-uniformité." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLO009/document.

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Les sources de paires de photons constituent un bloc de base pour les technologies de traitement et transmission de l'information quantique. Une source consistant en une fibre microstructurée à coeur liquide permet à la fois une réduction du bruit de diffusion Raman, une adaptation simple et efficace aux réseaux de télécommunication quantique, et l'ajustement de ses propriétés d'émission par ingénierie de la microstructure et choix du liquide non linéaire. Ces recherches se concentrent sur l'étude de l'émission de paires de photons d'une telle source, et du mélange à quatre ondes à leur origin
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MORAES, JAIR R. de. "Estudo da preparação de microcristais de LiLa(WOsub(4))sub(2):TRsup(3+) para aplicações fotônicas." reponame:Repositório Institucional do IPEN, 2013. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10510.

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Made available in DSpace on 2014-10-09T12:41:19Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:03Z (GMT). No. of bitstreams: 0<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP<br>FAPESP:08/10721-9
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8

Longueteau, Emmanuel. "Synthèse d'ouverture à 3 télescopes : Etude et caractérisation des sources d'erreurs sur les données interférométriques." Limoges, 2002. http://www.theses.fr/2002LIMO0020.

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Le développement des interféromètres stellaires nécessite une phase d'étalonnage des instruments en laboratoire. La connaissance et le contrôle des objets étudiés est obligatoire pour la caractérisation de défauts instrumentaux. Ce manuscrit présente différentes sources de dégradations de mesures obtenues sur deux interféromètres stellaires de laboratoire réalisés à l'IRCOM. L'interféromètre ISTROG, réalisé uniquement à l'aide de composant d'optique guidée, a révélé, lors son étalonnage, une erreur systématique résultant des effets différentiels de dispersion chromatique sur les données interf
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9

Feve, Jean-Philippe. "Existence et symétrie des interactions à 3 et 4 photons dans les cristaux anisotropes : méthodes de mesure des paramètres affectant les couplages à 3 ondes : étude de KTP et isotypes." Nancy 1, 1994. http://www.theses.fr/1994NAN10038.

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Les propriétés optiques linéaires sont très importantes dans l'expression des propriétés optiques non-linéaires: nous étudions la localisation des accords de phase colinéaires et non colinéaires pour les interactions à 3 photons. L'extension du formalisme des facteurs de champs aux interactions à 4 ondes met en évidence les 7 types d'accord de phase. Il permet un traitement unifié des interactions de somme et différence de fréquence. La fiabilisation des mesures des propriétés optiques linéaires et non-linéaires nécessite la mise au point de méthodes spécifiques. KTP et ses isotypes constituen
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10

D'Hose, Nicole. "Étude expérimentale des mécanismes de photoproduction de pions et de photodésintégration sur l'hélium-3 dans la région de la résonance delta (1232)." Paris 11, 1988. http://www.theses.fr/1988PA112406.

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Le but de ce travail est l'étude des mécanismes d'absorption d'un photon réel mettant en jeu un, deux ou trois nucléons dans le noyau ³He, dans la région de la résonance Δ (1232). La sélection de ces mécanismes est réalisée par le choix de la réaction : la photo-production de pions s'effectue préférentiellement sur un nucléon quasi-libre du noyau, alors que la photodésintégration sans émission de pions implique l'absorption par plusieurs nucléons corrélés. Ces expériences ont été réalisées à l'Accélérateur Linéaire de Saclay sur la ligne de faisceau de photons quasi- monochromatiques obtenus p
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11

Andraud, Chantal. "Defauts d'empilement dans le materiau unidimensionnel cscdbr::(3) : etude spectroscopique." Paris 6, 1987. http://www.theses.fr/1987PA066140.

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L'etude des proprietes optiques de cscdbr::(3) a montre l'existence de centres br::(2)**(2-). L'excitation des echantillons par des rayonnements ionisants (rx, faisceau d'electrons) et des experiences d'absorption a deux photons ont permis d'associer les differentes bandes d'emission et d'absorption observees a des transitions appartenant a ces centres. L'existence de ces centres br::(2)**(2-) est attribuee a la presence de defauts d'empilement. L'effet d'une pression hydrostatique, le dopage par des ions pb**(2x) et le recuit des cristaux confirment l'hypothese
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TOUAHRI, DRISS. "Developpement d'une chaine de synthese de frequences de l'infrarouge au visible : application a la mesure de la frequence de la transition a deux photons 5s#1#/#2 (f=3) - 5d#5#/#2 (f=5) du rubidium (#8#5rb) a 385 thz (778 nm)." Paris 11, 1996. http://www.theses.fr/1996PA112262.

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L'objet de cette these est la mesure de la frequence absolue de la transition a deux photons 5s#1#/#2 (f=3) - 5d#5#/#2 (f=5) du rubidium a 385 thz (778 nm) sur laquelle est asservie une diode laser. Les performances metrologiques de ce dispositif sont: stabilite: 4 x 10#-#1#3 #-#1#/#2 repetabilite: 5 x 10#-#1#3 reproductibilite: 2 x 10#-#1#2 elles en font un candidat tres prometteur en tant qu'etalon secondaire de frequence dans le domaine visible. La frequence de cette transition est mesuree a l'aide d'une chaine de multiplication de frequence. La frequence d'un laser a co#2 stabilisee sur un
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Maksymov, Ivan. "Modelling of photonic components based on ÷(3)nonlinear photonic crystals." Doctoral thesis, Universitat Rovira i Virgili, 2006. http://hdl.handle.net/10803/8474.

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En esta tesis se llevó a cabo un estudio de diversas propiedades de los cristales fotónicos 1D y 2D no lineales de tercer orden y de cómo se pueden aplicar dichas propiedades al desarrollo de dispositivos totalmente ópticos (por ejemplo, limitadores y conmutadores, compuertas lógicas, transistores ópticos, etc.). Se propuso una aproximación numérica para calcular las características básicas de los cristales fotónicos no lineales como, por ejemplo, el diagrama de bandas o la transmisión. La aproximación numérica presentada en la tesis tiene ciertas ventajas útiles para cualquiera que diseñe dis
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14

Melo, Emerson Gonçalves de. "Integração monolítica de guias de onda, curvas e junções em Y baseados em cristais fotônicos planares de silício e com baixas velocidades de grupo." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-15012018-150947/.

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A fotônica em silício é um campo de pesquisas emergente com grande potencial para contribuir com a resolução de alguns dos problemas tecnológicos da atualidade. O gargalo imposto por interconexões metálicas na expansão da taxa de transmissão de dados em sistemas de comunicação como os de computadores de alto desempenho talvez seja um dos maiores desafios a serem superados. A propagação de luz em baixas velocidades de grupo e com controle de dispersão é uma das linhas de pesquisa atuais nas quais se busca explorar de forma mais eficiente as propriedades ópticas do silício, e assim, aumentar a c
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15

Pouya, Caroline. "Investigating naturally occurring 3-dimensional photonic crystals." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3744.

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This thesis describes my research into the highly tuned naturally occurring 3D photonic structures that are present on a selection of insects. The experimental and theoretical work presented in this thesis was performed in both the optical and microwave regimes. The work performed in the optical regime included both the geometric and optical characterisation of the native photonic structures present on the beetle Eupholus magni cus and the butter y Parides sesostris. The native photonic structures of these organisms were probed in order to determine their photonic responses and also to ascerta
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16

Sunter, Kristen Ann. "Optical Modeling of Superconducting Nanowire Single Photon Detectors." Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:13106421.

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Superconducting nanowire single photon detectors (SNSPDs) can detect single photons or low levels of infrared light in applications that require high speed and low timing jitter, such as integrated circuit analysis. Most applications also require a high device detection efficiency (DDE), but the DDE of SNSPDs is limited by many factors. A good optical design with an integrated optical cavity and dielectric layers can increase the absorptance of 1550-nm light in the active area to over 90%. Therefore, optical modeling using the transfer matrix method was used to guide the design and fabrication
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Buzbee, Michael Laurence. "3-Dimensional Photonic Circuits for Quantum Information Processing." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1461970290.

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Shneidman, Anna Vitalyevna. "Photonics in Low Index Media." Thesis, Harvard University, 2016. http://nrs.harvard.edu/urn-3:HUL.InstRepos:33493317.

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Many applications in photonics rely on the ability to confine light in small volumes. This is commonly achieved by utilizing two or more materials with a large refractive index contrast, such as silicon and silicon dioxide, diamond and air, etc. However, techniques available to fabricate sub-wavelength structures in these materials, including electron beam lithography followed by etching, or focused ion beam milling, are often costly and time consuming. In addition, there are few options to tune the optical response of fabricated devices. A panoply of new photonic applications can be unlocked
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Romijn, Elisabeth Inge. "Development of 3-D Quantitative Analysis of Multi-Photon Microscopy Images." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18425.

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Motivation: Cartilage is a robust but flexible connective tissue found in most joints of the body. The collagen fibres present in the extracellular matrix of cartilage contribute to its tensile strength and stiffness. The purpose of this study is to develop and implement methods to determine the orientation and anisotropy of collagen fibres in 3-D images gen- erated with multi-photon microscopy. The motivation behind developing these techniques is to improve the foundation for further studies on understanding the characteristics of the cartilage matrix. This in turn would give a better foundat
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20

Sun, Chengwei. "First measurement of the reaction helium-3(photon,proton -proton)neutron." W&M ScholarWorks, 1990. https://scholarworks.wm.edu/etd/1539623791.

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Differential cross sections for the {dollar}\sp3{dollar}He({dollar}\gamma{dollar},pp)n reaction were measured with a bremsstrahlung beam for kinematics selected in the quasi-free two-nucleon region with neutron recoil q{dollar}\sb{lcub}\rm n{rcub}\approx{dollar} 0. Five photon energy points were taken between 200 and 440 MeV. The two proton detectors were positioned in such a way that the angle of one proton, in the CM of the pp pair, relative to the photon direction is 75{dollar}\sp\circ{dollar}. The data confirm the predicted quenching of the cross section. In the photon energy region from 3
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Tang, Xiaofeng. "The fabrication of 3-D photonic band gap structures." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/43305.

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Thesis (Elec. E.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.<br>Includes bibliographical references (leaves 85-88).<br>by Xiaofeng Tang.<br>Elec.E.
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Damon, Vianney. "Filtrage programmable et mémoire quantique dans Er 3+ YSO." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00877060.

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Les ions de terres rares en matrice cristalline, refroidis à très basse température, offrent des propriétés remarquables pour le traitement analogique du signal sur porteuse optique. L'élargissement inhomogène du spectre d'absorption peut en effet atteindre plusieurs centaines de gigahertz alors que la largeur homogène des raies d'absorption des ions individuels ne dépasse pas quelques kilohertz. Par pompage optique il est alors possible de modifier à volonté le profil du spectre d'absorption. On dispose ainsi d'un filtre programmable présentant à la fois une très grande bande passante, donnée
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Yilmaz, Ercan. "Characteristic X-ray, Photoelectron And Compton-scattered Photon Escape From A Hpge Detector." Phd thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/3/1210061/index.pdf.

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Escape of photoelectrons, Compton-scattered photons and Ge X-rays from a HPGe detector was studied as a function of energy in the range 8-52 keV. A variable-energy source producing Cu, Rb, Mo, Ag, Ba, and Tb X-rays was used. All three mechanisms for energy loss were observed in the same experiment for Ba and Tb, while only X-ray and photoelectron escapes were evident in the spectra for Ag, Mo, Rb, and Cu. Spectral features and possible mechanisms for partial energy deposition were investigated. A Monte Carlo program was used to simulate the relevant interactions and to estimate the escape prob
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Hui, Pui Chuen. "Optomechanics and nonlinear mechanics of suspended photonic crystal membranes." Thesis, Harvard University, 2014. http://nrs.harvard.edu/urn-3:HUL.InstRepos:13068536.

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The recent demonstration of strong interactions between optical force and mechanical motion of an optomechanical structure has led to the triumphant result of mechanical ground-state cooling, where the quantum nature of a macroscopic object is revealed. Another intriguing demonstration of quantum physics on a macroscopic level is the measurement of the Casimir force which is a manifestation of the zero- point energy. An interesting aspect of the Casimir effect is that the anharmonicity of the Casimir potential becomes significant when the separation of microscale objects is in the sub-100nm re
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Nunes, Luiz Antonio de Oliveira. "Espectroscopia de dois fotons do ion Gd+3 em estruturas perovskitas." Universidade de São Paulo, 1988. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-10032008-113404/.

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Através da absorção de um e de dois fótons estudamos as diferentes transições do íon \'Gd POT.+3\' e GGG. Utilizando técnicas espectroscópicas com laser pulsado e laser contínuo, analisamos a influência do campo cristalino sobre o íon. Estes resultados estão em concordância com as previsões advindas da teoria de grupo. A partir da análise dos espectros de luminescência das amostras de GdAl\'O IND.3\', conseguimos detectar pequenos traços de impurezas nas mesmas. Não conseguimos detectar nenhuma anomalia nos espectros obtidos, de modo a não acreditarmos na existência de alguma interação Gadolín
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Zoubir, Arnaud. "TOWARDS DIRECT WRITING OF 3-D PHOTONIC CIRCUITS USING ULTRAFAST LASERS." Master's thesis, University of Central Florida, 2004. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3907.

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The advent of ultrafast lasers has enabled micromachining schemes that cannot be achieved by other current techniques. Laser direct writing has emerged as one of the possible routes for fabrication of optical waveguides in transparent materials. In this thesis, the advantages and limitations of this technique are explored. Two extended-cavity ultrafast lasers were built and characterized as the laser sources for this study, with improved performance over existing systems. Waveguides are fabricated in oxide glass, chalcogenide glass, and polymers, these being the three major classes of material
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Aldousari, Hanan. "Study of 2-to-3 photon annihilation using hydrophilic material as hypoxic tumour phantom." Thesis, University of Surrey, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616952.

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The use of three gamma annihilation as a new PET molecular imaging modality which can predict tumour hypoxia was proposed by Kacperski and Spyrou in 2004. The positronium and its annihilation, could then serve as an oxygen-sensitive marker. The relative magnitude of three photon annihilation is increased in an oxygen deficient environment. The main questions addressed in this thesis are the potential use of the lanthanum bromide LaBr3: Ce (5%) scintillator detector for three-photon positron annihilation measurements. Also, the optimum source-to-detector distance that achieves good efficiency a
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Pooley, Kathryn Jessica. "Patterned Aqueous Growth of Single Crystalline Zinc Oxide for Photonic Applications." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467362.

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Typically a top-down approach is used in the fabrication of functional nanodevices beginning with the bulk material and imposing a two or three-dimensional structure on the material through a combination of lithography and etching. Pre-patterning of a substrate, resulting in the selective growth of a material, has potential for forming three-dimensional device structures in ways that can be more efficient and which can avoid process complexity and process induced damage. In this thesis, the low temperature (90°C) aqueous growth of complex, single crystalline zinc oxide (ZnO) three-dimensiona
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Makgopa, Bessie Mmakgoto. "Simulation of the irradiation behaviour of the PBMR fuel in the SAFARI-1 reactor / B.M. Makgopa." Thesis, North-West University, 2009. http://hdl.handle.net/10394/4030.

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Irradiation experiments for the pebble bed modular reactor PBMR fuel (coated fuel particles and pebble fuel) are planned at the South African First Atomic Reactor Installation (SAFARI-1). The experiments are conducted to investigate the behavior of the fuel under normal operating and accelerated/accident simulating conditions because the safe operation of the reactor relies on the integrity of the fuel for retention of radioactivity. For fuel irradiation experiments, the accurate knowledge and analysis of the neutron spectrum of the irradiation facility is required. In addition to knowledge of
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Mankin, Max Nathan. "Advances in Crystal Growth and Assembly for Imparting Novel Photonic Properties to Semiconductor Nanowires." Thesis, Harvard University, 2015. http://nrs.harvard.edu/urn-3:HUL.InstRepos:23845427.

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Semiconductor nanowires comprise a versatile materials platform with which to characterize the properties of nanomaterials. The vast range of structural and compositional diversity of nanowires has also enabled their use as low-footprint building blocks in a variety of applications including bioelectronics, photonics, and energy conversion. Synthetic control of nanowire size, morphology, and composition as well as assembly of nanowires into pre-determined positions and orientations are paramount to enabling the aforementioned fundamental and applied research. To this end, this thesis presents
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LIBRANTZ, ANDRE F. H. "Estudo comparativo da emissoes do Nd(3+) nas configuracoes 4fsup(2)5d e 4fsup(3) induzidas pela excitacao multifotonica em cristais de YLF, GLF, LLF." reponame:Repositório Institucional do IPEN, 2000. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10830.

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Lloyd, Christopher. "The Photo-initiated Bergamn Cyclisation of Z-hex-3-ene-1,5-diyne." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499954.

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Bettahar, Houari. "High accurate 3-D photo-robotic nano-positioning for hybrid integrated optics." Thesis, Bourgogne Franche-Comté, 2019. http://www.theses.fr/2019UBFCD019/document.

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L'intégration hybride d'éléments photoniques individuels offre la promesse de fournir des performances très élevées, de proposer de nouvelles fonctionnalités et produits optiques mais aussi pour exploiter de nouveaux modes de propagation des faisceaux lumineux. Cette approche repose sur la capacité d'un positionnement multi Degré-De-Liberté (DDL) précis des éléments photoniques individuels. Ainsi, la mesure multi-DDL imprécise et le contrôle inexact des robots sont les principaux verrous à surmonter, notamment à l'échelle micrométrique Pour cela, une approche photo-robotique originale a été pr
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Petersson, Johan. "Effect of body posture on regional ventilation and perfusion at normal and increased gravity /." Stockholm, 2006. http://diss.kib.ki.se/2006/91-7140-920-3/.

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Henry, Samuel C. "3-D Terahertz Synthetic-Aperture Imaging and Spectroscopy." PDXScholar, 2013. https://pdxscholar.library.pdx.edu/open_access_etds/693.

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Terahertz (THz) wavelengths have attracted recent interest in multiple disciplines within engineering and science. Situated between the infrared and the microwave region of the electromagnetic spectrum, THz energy can propagate through non-polar materials such as clothing or packaging layers. Moreover, many chemical compounds, including explosives and many drugs, reveal strong absorption signatures in the THz range. For these reasons, THz wavelengths have great potential for non-destructive evaluation and explosive detection. Three-dimensional (3-D) reflection imaging with considerable depth r
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Graham, Matthew. "DEVELOPMENT OF HIGH REFRACTIVE INDEX POLY(THIOPHENE) FOR THE FABRICATION OF ALL ORGANIC 3-D PHOTONIC MATERIALS WITH A COMPLETE PHOTONIC BAND GAP." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1164049666.

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Shim, Dong Eun. "UV nanoimprinting using a polymer mold and its application to 3-D photonic crystal fabrication." Diss., Restricted to subscribing institutions, 2009. http://proquest.umi.com/pqdweb?did=1970611211&sid=54&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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Cameron, Craig G. "Natural and artificial fluorescence on 3-dimensional bioorganic nanostructures." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53451.

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A challenge exists for understanding the origin of color for structurally colored, 3-dimensional bioorganic nanostructures, such as the scales of butterflies, beetles, and moths. Complex, hierarchical structures found within such scales create the overall scale appearance. The controlled alteration of color through material deposition and the addition of new optical functionalities to such structures are other areas of scientific interest. This dissertation addresses these challenges with a first-of-its-kind, systematic isolation (deconstruction) of scale component nanostructures, followed by
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Paulik, Julia [Verfasser]. "[123I]-3-Iodcytisin als möglicher Radiotracer für die Darstellung der nikotinergen Acetylcholinrezeptoren mittels Single-Photon-Emissions-Tomographie / Julia Paulik." Bonn : Universitäts- und Landesbibliothek Bonn, 2015. http://d-nb.info/1077271263/34.

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Khanduyeva, Natalya. "Conjugated Polymer Brushes (Poly(3-hexylthiophene) brushes): new electro- and photo-active molecular architectures." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1232556562686-70575.

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The aim of the present work was to screen the main methods for the synthesis of conjugated polymers for their suitability in the preparation of conductive polymer brushes. The main focus was put on the grafting of intrinsically soluble substituted regioregular polyalkylthiophenes because of their excellent optoelectronic properties. The resulting polymer films were characterized and their optoelectrical properties studied. For the first time, a synthesis of conductive polymer brushes on solid substrates using “grafting-from” method was performed. The most important, from my opinion, finding of
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Hintz, Holger [Verfasser], and Thomas [Akademischer Betreuer] Chassé. "Photo-oxidation Kinetics of Poly-3-hexylthiophene Thin Films / Holger Hintz ; Betreuer: Thomas Chassé." Tübingen : Universitätsbibliothek Tübingen, 2012. http://d-nb.info/1162699760/34.

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Khanduyeva, Natalya. "Conjugated Polymer Brushes (Poly(3-hexylthiophene) brushes): new electro- and photo-active molecular architectures." Doctoral thesis, Technische Universität Dresden, 2008. https://tud.qucosa.de/id/qucosa%3A23635.

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The aim of the present work was to screen the main methods for the synthesis of conjugated polymers for their suitability in the preparation of conductive polymer brushes. The main focus was put on the grafting of intrinsically soluble substituted regioregular polyalkylthiophenes because of their excellent optoelectronic properties. The resulting polymer films were characterized and their optoelectrical properties studied. For the first time, a synthesis of conductive polymer brushes on solid substrates using “grafting-from” method was performed. The most important, from my opinion, finding of
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Fuentes, Iriarte Gonzalo. "AlN Thin Film Electroacoustic Devices." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://publications.uu.se/theses/91-554-5557-3/.

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Silva, Diego Silvério da. "Produção e caracterização de guias de onda dopados com terras-raras contendo nanopartículas semicondutoras." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-20062016-153455/.

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O presente trabalho tem como objetivo estudar a produção e caracterização de filmes finos do tipo GeO2-Bi2O3 (BGO) produzidos por sputtering-RF com e sem nanopartículas (NPs) semicondutoras, dopados e codopados com íons de Er3+ ou Er3+/Yb3+ para a produção de amplificadores ópticos. A produção de guias de onda do tipo pedestal baseados nos filmes BGO foi realizada a partir de litografia óptica seguida por processo de corrosão por plasma e deposição física a vapor. A incorporação dos íons de terras-raras (TRs) foi verificada a partir dos espectros de emissão. Análises de espectroscopia e micros
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Pauwels, Jaël. "High performance optical reservoir computing based on spatially extended systems." Doctoral thesis, Universite Libre de Bruxelles, 2021. https://dipot.ulb.ac.be/dspace/bitstream/2013/331699/3/thesis.pdf.

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In this thesis we study photonic computation within the framework of reservoir computing. Inspired by the insight that the human brain processes information by generating patterns of transient neuronal activity excited by input sensory signals, reservoir computing exploits the transient dynamics of an analogue nonlinear dynamical system to solve tasks that are hard to solve by algorithmic approaches. Harnessing the massive parallelism offered by optics, we consider a generic class of nonlinear dynamical systems which are suitable for reservoir computing and which we label photonic computing li
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Bahrs, Sabine. "Persistent photo induced effects in high-temperature superconducting RBa2Cu3O7-ddelta [RBa 2 Cu 3 O 7 delta]." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=978946693.

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Araujo, Leandro Goulart de. "Photo-oxidative degradation of bisphenol A by H2O2/UV: process study and kinetic modelling." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-17072018-111837/.

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Bisphenol A (BPA) is widely used in the production of plastics, epoxy resins and polycarbonates. It is a toxic, endocrine disruptor compound. Different studies have shown the presence of BPA in several environmental systems, classifying it as a worldwide persistent pollutant which may act synergistically with other pollutants. In this context, advanced oxidation processes (AOP) have received great attention due to their ability to degrade pollutants with such characteristics, through their transformation into less hazardous compounds or even their mineralization. Although there are investigati
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Carvalho, Daniel Orquiza de. "Desenvolvimento de processos de fabricação de dispositivos óptico integrados em tecnologia de silício para aplicação em sensoriamento." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-19092012-170421/.

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Os objetivos desta tese são: o estudo e aprimoramento dos diferentes parâmetros geométricos e de processo de fabricação de guias de onda ARROW (Anti-Resonant Reflecting Optical Waveguides), visando reduzir as perdas por propagação; e o projeto, fabricação e caracterização de sensores óptico integrados utilizando os processos aprimorados. Os parâmetros estudados foram: os materiais utilizados nas camadas antirresonantes, as espessuras destas camadas, a profundidade de corrosão para definição do rib e a rugosidade nas paredes laterais, que considera-se o parâmetro mais crítico no que diz respeit
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Rizzo, Vinícius Zacarias. "Estudo das propriedades ópticas e eletro-ópticas de filmes de carbono amorfo tipo diamante - DLC." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3140/tde-10012011-143459/.

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Neste trabalho foram estudadas as características elétricas e ópticas de filmes de carbono tipo diamante (DLC Diamond-Like Carbon) depositados em um sistema de sputtering RF magnetron reativo em substratos de silício e vidro. Foram depositadas amostras em condições de processo distintas em cada tipo de substrato, sendo duas condições de pressão (5 mTorr e 10 mTorr) e para cada uma, quatro condições de potência de RF (100 W, 150 W, 200 W e 250 W). Os filmes depositados foram submetidos às seguintes técnicas de caracterização: perfilometria, para obtenção da espessura dos filmes e com isso a ta
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Pereira, Luciana. "Lições da indústria fotônica para o desenvolvimento tecnológico." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/3/3136/tde-18082008-143542/.

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Esta tese analisa como tecnologias emergentes podem ajudar a fortalecer o desenvolvimento industrial. A preocupação é pertinente, pois a produção tecnológica é um importante componente do desenvolvimento econômico. A partir das observações empíricas da indústria fotônica, nós extraímos algumas lições e propomos um modelo que explica como ocorre a evolução tecnoindustrial. Trata-se, pois, de um modelo geral que ajuda a entender os mecanismos que levam ao aumento da participação da produção industrial intensiva em tecnologia e que serve tanto para países em desenvolvimento quanto para os desenvo
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