Relevant bibliographies by topics / 3 photon / Dissertations / Theses
To see the other types of publications on this topic, follow the link: 3 photon.

Dissertations / Theses on the topic '3 photon'

Author: Grafiati
Published: 18 May 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic '3 photon.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

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

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
2

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
3

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

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
4

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
5

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
6

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
7

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
8

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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
9

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
10

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

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.

Full text
Abstract:
Made available in DSpace on 2014-10-09T12:44:29Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:07:22Z (GMT). No. of bitstreams: 1 07114.pdf: 5950239 bytes, checksum: a45c843d71dddc5fe0b565d5be615211 (MD5)<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
APA, Harvard, Vancouver, ISO, and other styles
12

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/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

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

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
14

Mitsuoka, Ronny Mikyo. "Aplicação de métodos de imagem molecular no estudo dos efeitos terapêuticos da galectina-3 em glioblastoma." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/5/5155/tde-27102015-115630/.

Full text
Abstract:
O glioma de grau IV (geralmente chamado de Glioblastoma Multiforme - GBM) é o tumor mais agressivo e maligno do sistema nervoso central. A elevada mortalidade e baixa expectativa de vida proporcionado por esta doença, tem direcionado os esforços de muitos pesquisadores no desenvolvimento de novas formas de diagnóstico precoce, assim como a busca por terapias inovadoras. A galectina-3, uma proteína ligante de glicanas, é expressa diferencialmente em tecido normal vs. neoplásico e possui um papel importante na adesão, diferenciação, imunomodulação, apoptose, ciclo celular, assim como processos d
APA, Harvard, Vancouver, ISO, and other styles
15

Waidyawansa, D. Buddhini P. "A 3% Measurement of the Beam Normal Single Spin Asymmetry in Forward Angle Elastic Electron-Proton Scattering using the Qweak Setup." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1375705139.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
17

Marhatta, Ramesh. "Circular Polarization Spectroscopy: Disorientation Cross-Section in the 133Cs 6p2 P3/2 Level by Using Two-Photon Two-Color Nano-Second Pulsed Laser." Miami University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=miami1185434201.

Full text
APA, Harvard, Vancouver, ISO, and other styles
18

Louchet, Anne. "Manipulation optique d'une cohérence de spin nucléaire dans l'ion thulium en matrice cristalline." Phd thesis, Université Paris Sud - Paris XI, 2008. http://tel.archives-ouvertes.fr/tel-00345345.

Full text
Abstract:
La plupart des protocoles de stockage quantique de l'information reposent sur l'enregistrement d'un signal lumineux dans une superposition d'états de longue durée de vie. L'élément clé pour réaliser un tel enregistrement est un système atomique à 3 niveaux en Lambda, où deux sous-niveaux fondamentaux sont couplés optiquement à un même niveau supérieur. L'excitation optique est alors stockée dans une superposition des deux sous-niveaux fondamentaux. Les cristaux dopés aux ions de terre rare sont des candidats prometteurs pour ces applications, car ils présentent des durées de vie des cohérences
APA, Harvard, Vancouver, ISO, and other styles
19

Nguyen, Dao. "Design, Synthesis, and Characterization of Novel Hydrophilic Fluorene-Based Derivatives for Bioimaging Applications." Doctoral diss., University of Central Florida, 2009. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/2842.

Full text
Abstract:
In this work, hydrophilic fluorene-based derivatives that contain ethylene oxide substituents, have been synthesized and characterized for potential use as new fluorophores for bioimaging applications and for fluorescence sensing of heavy metals. Symmetrical and unsymmetrical fluorene derivatives based on structural types of acceptor-pi-acceptor, acceptor-pi-donor, and donor-pi-donor were characterized by TGA, UV-vis absorption, fluorescence emission, lifetime, anisotropy, and two-photon absorption (2PA) cross section. They were found to possess high thermal stability, high photostability, hig
APA, Harvard, Vancouver, ISO, and other styles
20

Parpaleix, Alexandre. "Imagerie biphotonique de la Po2 intracérébrale : une mesure de l’activité neuronale." Thesis, Paris 5, 2013. http://www.theses.fr/2013PA05T072/document.

Full text
Abstract:
L’imagerie fonctionnelle cérébrale détecte les changements hémodynamiques induits par un stimulus pour déterminer les zones d’activation neuronale. Plus particulièrement, l’imagerie BOLD en IRMf détecte les changements d’oxygénation du sang grâce aux propriétés paramagnétiques de la déoxyhémoglobine. L’oxygène n’est donc pas uniquement un substrat énergétique pour le tissu neuronal, il joue également un rôle majeur dans l’imagerie noninvasive du cerveau humain. Au cours de ma thèse, j’ai tout d’abord participé à la mise au point d’une nouvelle technique non-invasive d’imagerie de l’oxygène dan
APA, Harvard, Vancouver, ISO, and other styles
21

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
22

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

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
23

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
24

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
25

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
26

Tang, Xiaofeng. "The fabrication of 3-D photonic band gap structures." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/43305.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
27

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
29

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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
30

Liu, Yanqing. "Thermal engineering in an epitaxial nanostructured germanium semiconductor." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY082/document.

Full text
Abstract:
Ce travail de thèse porte sur les propriétés de transport thermique liées aux phonons dans un nouveau matériau nanostructuré constituée de couches minces de Ge:Mn de type "electron crystal - phonon glass". Ce matériau est élaboré par épitaxie par jets moléculaire au CEA/INAC à Grenoble sur des substrats spécifiques « Germanium-on-insulator (GOI) ». Il consiste en une matrice de germanium possédant une qualité cristalline parfaite dans laquelle sont inclues une importante concentration de nano-inclusions de Ge3Mn5 de forme quasi-sphérique. Révélé par les caractérisations de TEM, les nano-inclus
APA, Harvard, Vancouver, ISO, and other styles
31

Ridah, Abderraouf CARABATOS DIR THESE. "CONTRIBUTION A L'ETUDE DE L'INTERACTION PHONON MOU-PIC CENTRAL AU VOISINAGE DES TRANSITIONS DE PHASE DE KNBO#3 ET AGNBO#3 /." [S.l.] : [s.n.], 1987. ftp://ftp.scd.univ-metz.fr/pub/Theses/1987/Ridah.Abderraouf.SMZ8719.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
32

Dupuis, Anne-Claire. "V 2 O 3 (0001)/Au(111) and /W(110)." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2002. http://dx.doi.org/10.18452/14834.

Full text
Abstract:
Ziel dieser Arbeit war es, die Reaktivität von V2O3(0001) zu untersuchen. In dieser Arbeit wird sich zunächst mit dem epitaktischen Wachstum von V2O3-Filmen auf Au(111)und W(110) befaßt. Stöchiometrie und Geometrie der dünnen Filme wurden mit Röntgenphotoelektronenspektroscopie (XPS), Röntgenabsorptionsspektroskopie (NEXAFS) und Beugung niederenergetischer Elektronen (LEED) charakterisiert. Wir haben gezeigt, dass die Oberfläche zwei Terminierungen aufweist, die sich durch die An- bzw. Abwesenheit von zusätzlichen Sauerstoffatomen auf der Oberfläche unterscheiden. Diese Sauerstoffatome bild
APA, Harvard, Vancouver, ISO, and other styles
33

Ftouni, Hossein. "Transport thermique dans des membranes très minces de SiN amorphe." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00995424.

Full text
Abstract:
Afin de comprendre les mécanismes de transport de la chaleur dans des films très minces des matériaux amorphes, nous avons proposé et démontré expérimentalement une nouvelle technique de mesure des propriétés thermiques de membranes très minces. Cette technique consiste à coupler la méthode 3 oméga avec la géométrie Völklein (membrane suspendue allongée). L'échantillon d'intérêt est alors monté dans un pont de Wheatstone spécifique afin d'éliminer le signal électrique 1 oméga. Cette technique permet de mesurer avec une très haute sensibilité le signal thermique 3 oméga et donc les propriétés t
APA, Harvard, Vancouver, ISO, and other styles
34

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
35

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
36

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
37

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
38

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
39

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
40

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
41

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
42

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
43

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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
44

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.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
45

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.

Full text
APA, Harvard, Vancouver, ISO, and other styles
46

Chen, Peixuan. "Thermal transport through SiGe superlattices." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-159170.

Full text
Abstract:
Understanding thermal transport in nanoscale is important for developing nanostructured thermolelectric materials and for heat management in nanoelectronic devices. This dissertation is devoted to understand thermal transport through SiGe based superlattices. First, we systematically studied the cross-plane thermal conductivity of SiGe superlattices by varying the thickness of Si(Ge) spacers thickness. The observed additive character of thermal resistance of the SiGe nanodot/planar layers allows us to engineer the thermal conductivity by varying the interface distance down to ~1.5 nm. Si-Ge in
APA, Harvard, Vancouver, ISO, and other styles
47

Côté, Denis. "Etude spectroscopique de defauts et d'impuretes dans les semi-conducteurs 3-5." Paris 6, 1988. http://www.theses.fr/1988PA066169.

Full text
Abstract:
Etude, par absorption ir a transformee de fourier et a la temperature de l'helium liquide, des impuretes vanadium et hydrogene. Mise en evidence du vanadium ionise dans inp par spectroscopie sous contrainte uniaxe. Observation dans gaas, inp et gap des modes localises de vibration attribues a des complexes hydrogene-defaut. Etude analytique du couplage vibronique d'un etat electronique triplet a un mode de vibration triplement degenere dans le domaine du couplage fort
APA, Harvard, Vancouver, ISO, and other styles
48

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/.

Full text
Abstract:
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
APA, Harvard, Vancouver, ISO, and other styles
49

Heron, Jean-Savin. "Transport des phonons à l'échelle du nanomètre." Phd thesis, Grenoble 1, 2009. http://tel.archives-ouvertes.fr/tel-00461703.

Full text
Abstract:
Pour comprendre les mécanismes du transport de la chaleur à l'échelle du nanomètre, nous avons fabriqué des dispositifs suspendus nanostructurés complexes et mesuré leur conductance thermique aux températures cryogéniques, notamment via la méthode 3 oméga. Nous avons pu ainsi démontrer la dépendance du transport des phonons aux dimensions et à la géométrie des nanostructures. Pour des nanofils de silicium d'une longueur comprise entre 8 et 10 µm, et d'une section de 200x100 nm^2, nous observons une déviation au régime diffusif de Casimir sous 5K, que nous pouvons expliquer en tenant compte de
APA, Harvard, Vancouver, ISO, and other styles
50

Heron, Jean-Savin. "Transport des phonons à l'échelle du nanomètre." Phd thesis, Grenoble 1, 2009. http://www.theses.fr/2009GRE10183.

Full text
Abstract:
Pour comprendre les mécanismes du transport de la chaleur à l'échelle du nanomètre, nous avons fabriqué des dispositifs suspendus nanostructurés complexes et mesuré leur conductance thermique aux températures cryogéniques, notamment via la méthode 3 oméga. Nous avons pu ainsi démontrer la dépendance du transport des phonons aux dimensions et à la géométrie des nanostructures. Pour des nanofils de silicium d'une longueur comprise entre 8 et 10 µm, et d'une section de 200x100 nm^2, nous observons une déviation au régime diffusif de Casimir sous 5K, que nous pouvons expliquer en tenant compte de
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography