Дисертації з теми "Photone"
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Snizhko, D. "Photone counting for single molecula acts registration." Thesis, КрНУ, 2018. http://openarchive.nure.ua/handle/document/7522.
Повний текст джерелаUpham, Jeremy. "Dynamic Photon Control by Photonic Crystals." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142228.
Повний текст джерелаHeinze, Dirk, Artur Zrenner, and Stefan Schumacher. "Polarization-entangled twin photons from two-photon quantum-dot emission." AMER PHYSICAL SOC, 2017. http://hdl.handle.net/10150/624438.
Повний текст джерелаLillich, Joachim. "Untersuchung der Produktion prompter Photonen und neutraler Pionen in der Photon-Photon-Streuung mit dem OPAL-Experiment." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970692706.
Повний текст джерелаSaulnier, Nicole A. "Computational Modeling of Photonic Crystal Microcavity Single-Photon Emitters." Research Showcase @ CMU, 2011. http://repository.cmu.edu/dissertations/53.
Повний текст джерелаCordier, Martin. "Photon-pair generation in hollow-core photonic-crystal fiber." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT024/document.
Повний текст джерелаPhoton pair sources are an essential component of the emerging quantum information technology. Despite ingenious proposals being explored in the recent years based on either second order nonlinear processes in crystals and waveguides or on third order processes in fibers, limitations remain, due to losses and specifically coupling losses in the former case and due to Raman generation in silica, giving rise to a broad spectrum noise in the latter. These limitations have been challenging to lift because of the limited alternative nonlinear materials that fulfil the conditions for the generation of bright and high fidelity photon pairs in integrable photonic structures. In the present project, we develop a new and versatile type of photonic architecture for quantum information applications that offers access to a variety of nonlinear optical materials that are micro-structured in optical fiber forms to generate photon pairs, without the drawback of Raman scattering and with a large design parameter-space. Indeed, with a careful design of the HCPCF along with the appropriate choice of fluid, one can (i) control the dispersion and the transmission to generate photons with the most favourable phase-matching condition over a large spectral range, (ii) adjust the fibre core size and/or shape to enhance nonlinearity or the coupling efficiency with other fibres, (iii) totally suppress the Raman effect in monoatomic gases for instance or have only narrow and separated Raman lines that can thus be easily separated from the useful parametric lines in liquids
Cajgfinger, Thomas. "Etudes théorique et expérimentale du suivi de particules uniques en conditions extrêmes : imagerie aux photons uniques." Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00999629.
Повний текст джерелаSimonyan, Ani. "Dark Photon Search with the HPS Experiment at JLab." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS561/document.
Повний текст джерелаThe heavy photon search (HPS) experiment in Jefferson Lab (USA) is looking for a new vector gauge boson, called "heavy photon" or "dark photon", in a mass range of 20 MeV to 1000 MeV. Such particle can couple to the standard model photon through kinetic mixing and therefore can be radiated in electron scatterings. Using a high intensity, one to six GeV electron beam sent onto a tungsten target, HPS will look for a narrow resonance above the QED background that would be a signature of a dark photon. HPS will also exploit the fact that for small couplings, this dark photon would also travel a detectable distance before decaying, providing a second signature in the form of a vertex away from the target. In this thesis, I will present the motivations to look for such a dark photon in this particular domain of phase space, then present the HPS spectrometer, with a particular focus on the electromagnetic calorimeter which was a focus of my work. Then, I will present my work using a Monte-Carlo integration to calculate the cross section of the expected background QED processes for the HPS experiment. The final part of my work presented in this thesis will be focused on my data analysis, looking for a bump on the QED background, I carried out using data taken in Spring 2015
Schröder, Tim. "Integrated photonic systems for single photon generation and quantum applications." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16723.
Повний текст джерелаThe presented thesis covers the development and investigation of novel integrated single photon (SP) sources and their application for quantum information schemes. SP generation was based on single defect centers in diamond nanocrystals. Such defect centers offer unique optical properties as they are room temperature stable, non-blinking, and do not photo-bleach over time. The fluorescent nanocrystals are mechanically stable, their size down to 20nm enabled the development of novel nano-manipulation pick-and-place techniques, e.g., with an atomic force microscope, for integration into photonic structures. Two different approaches were pursued to realize novel SP sources. First, fluorescent diamond nanocrystals were integrated into nano- and micrometer scaled fiber devices and resonators, making them ultra-stable and maintenance free. Secondly, a solid immersion microscope (SIM) was developed. Its solid immersion lens acts as a dielectric antenna for the emission of defect centers, enabling the highest photon rates of up to 2.4Mcts/s and collection efficiencies of up to 4.2% from nitrogen vacancy defect centers achieved to date. Implementation of the SIM at cryogenic temperatures enabled novel applications and fundamental investigations due to increased photon rates. The determination of the spectral diffusion time of a single nitrogen vacancy defect center (2.2µs) gave new insights about the mechanisms causing spectral diffusion. Spectral diffusion is a limiting property for quantum information applications. The table-top SIM was integrated into a compact mobile SP system with dimension of only 7x19x23cm^3 while still maintaining record-high stable SP rates. This makes it interesting for various SP applications. First, a quantum key distribution scheme based on the BB84 protocol was implemented, for the first time also with silicon vacancy defect centers. Secondly, a conceptually novel scheme for the generation of infrared SPs was introduced and realized.
Knauer, Sebastian. "Photonic structure coupling and strain sensing with single photon emitters." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.715786.
Повний текст джерелаKiyohara, Takayuki. "Generation of heralded multi-photon parallel state for realizing a large-scale photonic quantum circuit." Kyoto University, 2020. http://hdl.handle.net/2433/253284.
Повний текст джерелаCande, Manutea. "Entangled photons in disordered media : from two-photon speckle patterns to Schmidt decomposition." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY089/document.
Повний текст джерелаThis thesis deals with the transmission by multiple scattering of high-dimensional bipartite entangled states of light through a random medium. This theoretical work merges two branches of physics, quantum optics and wave physics in random media.In the first chapter, we provide the basic toolbox of quantum optics required to understand further work. After a presentation of the quantization of light in an open medium, we introduce the main quantum states of light that are studied in the thesis. Then, we present the most important properties of quantum states, the quantum entanglement. After a general introduction, the still debated concept of entanglement between indistinguishable particles is presented and discussed.Because of the randomness of the medium in which the light propagates, the observables considered in this thesis have to be treated statistically. Hence, the second chapter presents a statistical approach to the multiple scattering of light. We first consider a microscopic description of the multiple scattering based on the so-called Green's function formalism and then turn to a macroscopic description which uses the random S-matrix formalism.In the third chapter, we study the two-photon speckle patterns appearing in coincidence measurements. We first introduce the main properties of the two-photon state that we consider and discuss the coherence of the two-photon light. Then, a detailed analysis of the two-photon speckle pattern obtained with a broadband two-photon state incident on a disordered medium is given. We discuss whether or not signatures of non-classical light can be seen in coincidence measurements. Finally, we calculate the visibility of the one- and two-photon speckle patterns and show how the entanglement present in the incident state affects these visibilities.Finally, we develop a new theoretical approach to quantify the average amount of entanglement in the scattered state. Using the random matrix theory, we derive the Schmidt decomposition of the scattered entangled state. We show how the statistics of the disorder impacts on the density of the Schmidt eigenvalues and quantify the entanglement through several measures of entanglement like the von Neumann entropy of Schmidt eigenvalues and the Schmidt number
Danley, Tyler W. "Photon-Related Elliptic Azimuthal Asymmetry and Photon-Hadron Correlations with an Isolation Cut in Au+Au Collisions at v(s_NN )= 200 GeV at RHIC-PHENIX." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1542201804266935.
Повний текст джерелаZheng, Dingwei. "Study and manipulation of photoluminescent NV color center in diamond." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2010. http://tel.archives-ouvertes.fr/tel-00595302.
Повний текст джерелаMarseglia, Luca. "Nano-structures coupled to optically active defects in diamond." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573911.
Повний текст джерелаZhu, Di S. M. Massachusetts Institute of Technology. "Superconducting nanowire single-photon detectors on aluminum nitride photonic integrated circuits." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108974.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 85-91).
With recent advances in integrated single-photon sources and quantum memories, onchip integration of high-performance single-photon detectors becomes increasingly important. The superconducting nanowire single-photon detector (SNSPD) is the leading single-photon counting technology for quantum information processing. Among various waveguide materials, aluminum nitride (AlN) is a promising candidate because of its exceptionally wide bandgap, and intrinsic piezoelectric and electro-optic properties. In this Master's thesis, we developed a complete fabrication process for making high-performance niobium nitride SNSPDs on AlN, and demonstrated their integration with AlN photonic waveguides. The detectors fabricated on this new substrate material have demonstrated saturated detection efficiency from visible to near-IR, sub-60-ps timing jitter, and ~6 ns reset time. This work will contribute towards building a fully integrated quantum photonic processor.
by Di Zhu.
S.M.
Purtov, Julia [Verfasser]. "Bio-inspired photonic surfaces by enhanced Two-Photon Lithography / Julia Purtov." Saarbrücken : Saarländische Universitäts- und Landesbibliothek, 2021. http://d-nb.info/1240674147/34.
Повний текст джерелаKwan, Kai-Cheong. "The effects due to disorder in the applications of photonic band gap materials /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202002%20KWAN.
Повний текст джерелаIncludes bibliographical references (leaves 58-59). Also available in electronic version. Access restricted to campus users.
Choi, Hyeongrak. "Photonic crystal cavity with self-similar structure and single-photon Kerr nonlinearities." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/108985.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 31-34).
We propose a design of photonic crystal cavity with self-similar electromagnetic boundary conditions, that achieve ultrasmall mode volume (Vff). The electric energy density of a cavity mode can be maximized in the air or dielectric region, depending on the choice of boundary conditions. We illustrate the design concept with a silicon-air ID photon crystal cavity that reaches an ultrasmall mode volume of Vff ~ 7.01 x 10- 5 [lambda]3 at [lambda] ~ 1550 nm. We show that the extreme light concentration in our design can enable ultra-strong Kerr nonlinearities, even at the single photon level. These features open new directions in cavity quantum electrodynamics, spectroscopy, and quantum nonlinear optics.
by Hyeongrak Choi.
S.M.
Hassan, Safaa. "Optical Property Study of 2D Graded Photonic Super-Crystals for Photon Management." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1703318/.
Повний текст джерелаKlarup, Kyle. "Density Controlled Photon Pair Generation: a Prototype Source of Tunable Entangled Photons from Supercritical Xenon." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23127.
Повний текст джерелаGoegan, Bastien. "Synthèse et application d’inducteurs de gènes photo-activables pour le contrôle in vivo de l’expression d’un gène." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF078/document.
Повний текст джерелаThe structural neural network’s is a fundamental process that ensures the proper functioning of the brain. To understand the formation and activity of these networks, we are developing a method which spatio-temporally controlled in vivo, the expression of targeted genes involved in this process at individual neuron cells scale by light. To achieve this in vivo tests, it is necessary to work with methods which are orthogonal to their cellular environment. Photochemical activation by photo-cleavage of an inert biological precursor offers a unique orthogonal way to attain this spatio-temporal control. Therefore, we have recently developed a new family of photoremovable group which are sensitive to two-photon (TP) excitation sensitive, in order to irradiate at favorable wave-lengths for in vivo applications. Moreover, to photo-regulate the expression of genes with high spatial and temporal resolution, we are combining the inducible gene expression system by tetracycline called « Tet-on » system to different photo-activable precursors of tetracycline analogs obtained by hemi-synthesis. All this, should allow us to get an effective system for the in vivo expression of a gene of interest by light excitation in order to photoactivate Kir2.1, a gene that cell autonomously silences the electrical activity of neurons in a subset of cells
Tengner, Maria. "Photonic Qubits for Quantum Communication : Exploiting photon-pair correlations; from theory to applications." Doctoral thesis, KTH, Mikroelektronik och tillämpad fysik, MAP, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4798.
Повний текст джерелаQC 20100914
Najafi, Faraz. "Superconducting nanowire single-photon detectors : new detector architectures and integration with photonic chips." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99836.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 153-161).
Superconducting nanowire single-photon detectors (SNSPDs) are a promising technology for long-distance optical communication and quantum information processing. Recent advances in single-photon generation, storage and detection technologies have spurred interest in integration of these components onto a single microchip, which would act as a low-power non-classical optical processor. In this thesis, I will present a method for the scalable integration of SNSPDs with photonic chips. I will show that, using a micron-scale flip-chip process, waveguide-coupled SNSPDs can be integrated onto a variety of material systems with high yield. This technology enabled the assembly of the first photonic chip with multiple adjacent SNSPDs with average system detection efficiencies beyond 10%. Using this prototype, we will show the first on-chip detection of non-classical light. I will further demonstrate optimizations to the detector design and fabrication processes. These optimizations increased the direct fabrication yield and improved the timing jitter to 24 ps for detectors with high internal efficiency. Furthermore, I will show a novel single-photon detector design that may have the potential to reach photodetection dead times below 1ns.
by Faraz Najafi.
Ph. D.
Schwagmann, Andre. "On-chip single photon sources based on quantum dots in photonic crystal structures." Thesis, University of Cambridge, 2013. https://www.repository.cam.ac.uk/handle/1810/244393.
Повний текст джерелаXiong, Chunle. "Nonlinearity in photonic crystal fibres." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.512286.
Повний текст джерелаWilliams, Gareth Owen Scott. "Photochemical kinetics and fluorescence spectroscopy in photonic crystal fibres." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/11747.
Повний текст джерелаFrisson, Thibault. "Mesure de la luminosité pour l'expérience H1." Phd thesis, Université Paris Sud - Paris XI, 2006. http://tel.archives-ouvertes.fr/tel-00166327.
Повний текст джерелаJ'ai également étudié les événements Compton élastique. La diffusion Compton élastique est utilisée pour une mesure complémentaire de la luminosité car sa section efficace est connue avec une bonne précision et la signature des événements dans le détecteur H1 est facilement identifiable.
Di, Lorenzo Fabio. "Sintesi di immagini realistiche mediante l'uso del Photon differentials come estensione del Photon mapping." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3908/.
Повний текст джерелаDyndal, Mateusz. "Two-Photon Interactions in Proton-Proton Collisions with the ATLAS Experiment at the LHC." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112186/document.
Повний текст джерелаThis thesis presents a first measurement of the exclusive cross section for the reaction photon-photon-> di-leptons in proton-proton collisions at center of mass energy of 7 TeV in the ATLAS experiment at the LHC. The measurement is realized with all data accumulated during the year 2011 with an integrated luminosity of 4.6/fb. The first part of the thesis is dedicated to the theoretical description of this kind of interactions. The calculus of the amplitude for the reaction photon-photon-> di-leptons is well known in the context of the standard model of particle physics. However, the situation at the LHC is more complex. It requires taking into account the finite size effects of the protons. The understanding of this effect and its evaluation is one of my personal contributions, which has been published. The nominal cross section is then reduced by about 20% following this effect, which is non negligible. The second part of the thesis concerns the description of the detectors of the ATLAS experiment. In particular, I describe the work I have realized on the simulation of some of these devices, mainly the detectors located in the direction of flight of the protons that allows a measurement of the trajectory of the scattered (intact) protons. Finally, the last part of the thesis is devoted to the experimental measurement of the cross section of the reaction photon-photon-> di-leptons in proton-proton collisions, as mentioned above. When the lepton pair is a pair of muons, we find an exclusive cross section of 0.628 ± 0.032(stat) ± 0.021(syst) pb, for the kinematical domain M(di-muons)>20 GeV, pT(muons)>10 GeV and |muons|<2.4. When the lepton pair is a pair of electrons (positrons), we have obtained an exclusive cross section of 0.428 ± 0.035(stat) ± 0.018(syst) pb, for M(ee)>24 GeV, pT(e)>12 GeV et |muons(e)|<2.4. Moreover, these measurements confirm that the reduction (suppression) factor with respect to the nominal theory prediction (without taking into account the finite size effect of the protons) is of the order of 20% in the energy domain of the measurement. A perspective for this work is to make the measurement at larger energy with the new data recorded by the ATLAS experiment since 2015. Moreover, a direct measurement of the trajectory of protons could help for the exclusive selection
Bounouar, Samir. "Corrélation de photons sur un émetteur de photons uniques semi-conducteur à température ambiante." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00727393.
Повний текст джерелаChen, Vincent W. "Fabrication and chemical modifications of photonic crystals produced by multiphoton lithography." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/45918.
Повний текст джерелаChennoufi, Rahima. "Etudes des relations structure-activités de molécules photoactivables pour imager et déclencher des processus biologiques sous excitation 2-photon." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLN022/document.
Повний текст джерелаThe presented works in this manuscript approach the study of two distinct families of photoactivatable molecules that induce different biological processes under 2-photon excitation : triphenylamines (TPAs) and second generation Nanotriggers (NTs). TPAs present a great interest for 2-photon photodynamic therapy (PDT), thanks to their high 2-photon absorption cross-sections (325-764 GM) and their ability to induce cell death mediated by reactive oxygen species (ROS) production under 1- or 2-photon excitation. Moreover, their high fluorescence allows the imaging of cell death due to their particular behaviour in cells: TPAs initially localize in the cytoplasm of living cells, but translocate to the nucleus of apoptotic cells. Second generation NTs were designed based on the model of NT1, the first synthesized Nanotrigger. Their general structure has been designed to bind to the NO Synthase protein (NOS) and generate a high redox potential under excitation only, leading to the initiation of the electron flow through the protein and resulting in NO production. The chemical structures of the seven newly synthesized molecules differ on many levels. This study has identified, among the seven second generation NTs, two molecules which are able to penetrate in endothelial cells, target eNOS and initiate the electron transfer at the eNOS level under 1- or 2-photon excitation. The experiments presented in this thesis allowed to establish structure-activity relationships for each compound family regarding the different mechanisms induced by their photoactivation
Kelkar, Kapil S. "Semiconductor modeling for multi-layer, high field photo switch using sub-bandgap photons /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p1421147.
Повний текст джерелаRengstl, Ulrich [Verfasser]. "III-V Semiconductor Photonic Integrated Circuits with Quantum Dots as Single-Photon Emitters / Ulrich Rengstl." München : Verlag Dr. Hut, 2017. http://d-nb.info/1140977695/34.
Повний текст джерелаShirdel, Javid. "Photo-physical characterization of flavin-pyrene-phenothiazine molecular photonic complexes." [S.l.] : [s.n.], 2007. http://deposit.ddb.de/cgi-bin/dokserv?idn=985128062.
Повний текст джерелаBerman, Daniel. "From Photons to Photos: Mapping Functional and Organizational Properties of Human Visual Cortex with fMRI." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1422972281.
Повний текст джерелаChammam, Marwa. "Carbo-chromophores di, quadri, octupolaires pour l'absorption à deux photons." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30236.
Повний текст джерелаThe manuscript deals with the design, synthesis and study of optical properties of one- and two-photon absorption in a series of organic chromophores with extended pi-conjugated systems of the carbo-mers family, based on preliminary results obtained by the group for quadrupolar carbo-benzenes with fluorenyl substituents. The phenomenon of two-photon absorption (A2P) presenting a wide range of applications in various fields such as dynamic phototherapy, data storage, microfabrication or optical limitation, it has been the subject of numerous investigations which have allowed the establishment of structure-property relationships (SPRs) for the development of efficient systems, for which carbo-benzene derivatives meet several criteria a priori. Within the framework of this thesis, the work mainly concerns the synthesis and characterization of dipolar, quadrupolar and octupolar functional carbo-benzenes. The study of linear and non-linear optical properties of the isolated "carbo-chromophore" targets, performed in collaboration with Gabriel Ramos-Ortiz, CIO, Mexico, is also presented. The first chapter, bibliographical in nature, is divided into two parts. The first one presents the state of the art in nonlinear optics, in particular at the 3rd order for two photon absorption (A2P). The applications of A2P, techniques of cross-section measurement, and RSPs for the design of efficient chromophores are detailed. The second part provides a state of the art on carbo-meric molecules by giving an overview of their synthesis and properties. The second chapter describes results on the preparation and study of quadrupolar carbo- benzenes. It is divided into three parts. The first one describes the preparation of trifluorotolyl-substituted carbo-benzenes as well as the study of their properties of one-photon absorption, solubility, electro-chemical reductibility (by voltammetry) and self-assembly on surface (by STM imaging). The second part presents the synthesis and comparative study of one- and two-photon absorption properties of bis-dialkylthienylethynyl-carbo-benzenes and their parent molecule with a simple benzene core, the optical properties having been studied in collaboration with Gabriel Ramos-Ortiz. The third part envisages chromophores with a diketopyrrolopyrrole core, a classical chromophoric unit in A2P, aiming at the ultimate synthesis of derivatives with two carbo-benzene substituents. The third chapter focuses on the development of a new route for the synthesis of octupolar carbo-benzenes based on a novel macrocyclization strategy of the [6 + 6 + 6] type, the objective remaining to study of A2P properties of the targets. Three carbo-benzenes, with three fluorenylethynyl or dialkylthienylethynyl substituents were thus prepared and characterized. The fourth chapter addresses the challenge of the synthesis of dipolar carbo-benzenes carrying donor substituents (of 4-alkoxy- or 4-amino-phenyl type) and acceptor (of 4-nitro or 4-cyano-phenyl type) in para positions. The different synthesis strategies that have been envisaged and the obtained results are detailed
Rath, Patrik [Verfasser], and M. [Akademischer Betreuer] Wegener. "Integrated optomechanics and single-photon detection in diamond photonic integrated circuits / Patrik Rath ; Betreuer: M. Wegener." Karlsruhe : KIT-Bibliothek, 2016. http://d-nb.info/1123146136/34.
Повний текст джерелаSchmidt, Wolfgang-Gustav Ekkehart [Verfasser]. "Superconducting Nanowire Single-Photon Detectors for Quantum Photonic Integrated Circuits on GaAs / Wolfgang-Gustav Ekkehart Schmidt." Karlsruhe : KIT Scientific Publishing, 2020. http://d-nb.info/1213447836/34.
Повний текст джерелаLiu, Li. "Propriétés photo-physiques de nouveaux matériaux moléculaires pour la conversion de photons en énergie." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAE010/document.
Повний текст джерелаVarious photo-induced energy and energy transfer processes were investigated in solution and in the film by transient absorption and fluorescence spectroscopies for two types of solar cells. Combined with other experiments and through a global analysis, those ultrafast phenomena with their lifetimes were observed and the photo-induced scenarios were determined. The insight understanding of molecular materials could help chemists to design efficient solar cells.The first study about the influence of chemical designs on charge formation and separation involves different donor moieties and different solvents and the results were explained by Marcus-Jortner theory combined with quantum calculationThe second investigation is about Fe(II) complexes as photosensitizers for dye-sensitized solar cells. A series of homo- and heteroleptic Fe(II) complexes with carbene and terpyridine ligands have been studied in solution and in the film. The record triplet metal-to-ligand charge transfer state lifetime of Fe(II) complex is achieved in solution. The further understanding in the film is in progress
Gach, Jean-Luc. "Imageurs à amplification." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0317.
Повний текст джерелаThe quest for the perfect, noiseless detector, capable of detecting unique photons in the visible and infrared, and ultimately determining their energy is the grail of detection. To achieve this goal, many scientists have developed devices for several decades, and astronomers have always been at the forefront in this area. In this sense amplification imagers seem to be the fastest and most promising way to achieve this ultimate goal. Thus, after a brief history of the state of the art are exposed the photon counting systems (IPCS) developed at LAM, which were used on ESO telescopes 3m60, OHP 1m93 or WHT 4m20. Imaging integrated imaging devices such as Electron Multiplying Charge Coupled Devices (EMCCDs) are then discussed in the visible, with some examples of their use in astronomy. It is the technology that, applied to the wavefront sensors, has jointly enabled other developments the advent of extreme adaptive optics such as the VLT-SPHERE or SUBARU-SCExAO. To finish the e-APD (electron-induced avalanche photodiode) in the infrared will be discussed. E-APDs have this very interesting property of being almost perfect amplifiers, and have an ability to detect photon energy, properties that will be developed and analyzed. We will end up with the prospects and the progress that we are entitled to expect in the coming years
Verger, Arnaud. "Etude théorique des propriétés non-classiques de la lumière émise par des microcavités semiconductrices dans le régime de couplage fort." Paris 6, 2007. http://www.theses.fr/2007PA066669.
Повний текст джерелаLiu, Kun. "Observation du boson de Higgs dans sa désintégration en gamma+gamma et recherche de sa désintégration en Z+gamma avec le détecteur ATLAS." Phd thesis, Université Pierre et Marie Curie - Paris VI, 2014. http://tel.archives-ouvertes.fr/tel-01071714.
Повний текст джерелаJacques, Vincent. "Source de photons uniques et interférences à un seul photon.De l'expérience des fentes d'Young au choix retardé." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2007. http://tel.archives-ouvertes.fr/tel-00281163.
Повний текст джерелаDans la première partie, nous étudions la dualité onde-corpuscule pour un photon unique émis par excitation impulsionnelle d'un centre coloré NV individuel dans un nanocristal de diamant. Nous présentons dans un premier temps une expérience d'interférence à un photon réalisée avec un biprisme de Fresnel et par conséquent très proche conceptuellement de l'expérience standard des trous d'Young. Cette expérience permet de discuter de la complémentarité entre interférence et connaissance du chemin suivi par la particule dans l'interféromètre. Pour pénétrer davantage dans les problèmes conceptuels soulevés par la dualité onde-corpuscule, nous décrivons ensuite la réalisation expérimentale de l'expérience de pensée de "choix retardé", qui fût proposée par J. A. Wheeler au début des années soixante-dix.
La deuxième partie du mémoire est dédiée à l'amélioration des performances de sources de photons uniques. Nous décrivons ainsi la mise au point d'une nouvelle source de photons uniques fondée sur l'émission d'un centre coloré individuel à base d'impuretés de nickel dans le diamant, dont les propriétés d'émission sont bien adaptées à la cryptographie quantique en espace libre. Nous avons également mis en oeuvre une technique originale qui améliore de façon significative la photostabilité de molécules individuelles à température ambiante.
Sgandurra, Louis. "Calibration du calorimètre électromagnétique à l’aide des événements Z -> µµγ et recherches de bosons de Higgs additionnels dans le canal H -> γγ dans l’expérience CMS au LHC". Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10135/document.
Повний текст джерелаThe parameters of the Standard Model of particle physics have been verified experimentally with a very high accuracy. With the Higgs mechanism, this model explains the origin of the mass of the W and Z bosons, while keeping the photon massless, and thus breaks the gauge symmetry of the electroweak interaction. This mechanism is associated with a particle : the Higgs boson. The inability of this model to describe certain phenomena or the ad hoc choice of some parameters seems to suggest that it is only an approximation of a more general theory. Models beyond the Standard Model, such as 2HDM or NMSSM for example, can compensate some of its limitations and postulate the existence of additional Higgs bosons. Thus, in addition to the study of the photon energy in order to calibrate in situ the CMS electromagnetic calorimeter, my thesis also includes the search for additional Higgs bosons decaying into two photons.The first part of my work focuses on the study of decays Z → μ¯μγ, one of the only sources of real high-energy photons of the Standard Model selectable with a high purity. These events, in spite of their low cross section, are particularly suitable for the calibration of the CMS electromagnetic calorimeter. With these ones, we have extracted the energy scale of photons for 7 and 8 TeV data, have developed a method for measuring the energy resolution of the ECAL and have studied an algorithm designed to reduce the loss of resolution due to the increase of pileup. The second part of my work deals with the search for additional Higgs bosons decaying into a pair of photons with an invariant mass below 125 GeV. Our analysis is based on the Standard Model H → γγ study, which has been essential for the discovery of the new boson at 125 GeV. After the reoptimization of the analysis to improve efficiency on the signal and correctly take into account the Drell-Yan background, which becomes very important near the Z peak, we have been able to extract limits on the cross section of an additional Higgs boson between 90 and 115 GeV
Urdabayev, Nurtay. "Development of Photoreactive Organic Compounds with Large Two-Photon Absorption Cross Sections." Bowling Green State University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1148914562.
Повний текст джерелаSaravi, Sina [Verfasser], Thomas [Gutachter] Pertsch, Kurt [Gutachter] Busch, and Angelis Costantino [Gutachter] De. "Photon-pair generation in photonic crystal waveguides / Sina Saravi ; Gutachter: Thomas Pertsch, Kurt Busch, Costantino De Angelis." Jena : Friedrich-Schiller-Universität Jena, 2019. http://d-nb.info/1177386623/34.
Повний текст джерелаTal, Amir. "THREE-DIMENSIONAL MICRON-SCALE METAL PHOTONIC CRYSTALS VIA MULTI-PHOTON DIRECT LASER WRITING AND ELECTROLESS METAL DEPOSITION." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3889.
Повний текст джерелаM.S.
Optics and Photonics
Optics and Photonics
Optics MS
Jobunga, Eric Ouma. "Beyond-the-dipole effects in strong-field photoionization using short intense laser pulses." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2016. http://dx.doi.org/10.18452/17653.
Повний текст джерелаThe development of free-electron lasers and new generation light sources is enabling the realisation of high intensities and short pulse durations. In the weak-field intensity regime, the electric dipole approximation has been quite successful in describing the light-matter interaction dynamics reproducing many of the experimentally observed features. But at the unprecedented intensities and x-ray wavelengths produced by the new light sources, the electric dipole approximation is likely to break down. The role of higher multipole-order terms in the interaction Hamiltonian, associated with the radiation pressure, is then expected to become important in the accurate description of the interaction dynamics. This study extends the solution of the non-relativistic time dependent Schrödinger equation for a single active electron system interacting with short intense laser pulses beyond the standard dipole approximation. This is realized using both the Taylor and the Rayleigh plane-wave multipole expansion series of the spatial retardation term. The inclusion of higher multipole-order terms of the interaction is expected to increase the validity and accuracy of the calculated observables relative to the experimental measurements. In addition, it is shown that for equivalent laser parameters the Rayleigh multipole expansion series is more accurate and efficient in numerical convergence. The investigated non-dipole effects manifest in both differential and total ionization probabilities in form of the increased ion yields, the distorted above-threshold-ionization structure, and asymmetry of the photoelectron angular distribution in both polarization and propagation directions. The non-dipole effects are seen to increase with intensity, wavelength, and pulse duration. The results for hydrogen as well as helium atom are presented in this study.