Bibliografías temáticas / Optical detection of ultrafast phenomena

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Literatura académica sobre el tema "Optical detection of ultrafast phenomena"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 17 de febrero de 2022

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Artículos de revistas sobre el tema "Optical detection of ultrafast phenomena"

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Cheskis, Dima. "Magneto-Optical Tools to Study Effects in Dirac and Weyl Semimetals". Symmetry 12, n.º 9 (25 de agosto de 2020): 1412. http://dx.doi.org/10.3390/sym12091412.

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Research regarding topological Dirac and Weyl semimetals contributes to our understanding not only of the field of solid-state physics, but also the field of high-energy physics as the physics of Dirac and Weyl semimetals resembles the physics of Dirac and Weyl massless fermions. In condensed matter physics, the Weyl nodes are detached in momentum space and may be realized as emergent quasiparticles with a distinct chirality, left-handed or right-handed. These states lead to phenomena like the chiral anomaly and the anomalous Hall effect (AHE). Furthermore, the combination of quantum effects and magnetic effects in magnetic Weyl semimetals is very intriguing. Magneto-optical tools, which are usually used to study magnetic phenomena, also contribute to magnetic Weyl semimetals. Moreover, with the magneto-optical technique, it is possible to follow the dynamics of the processes and to study the lifetime of the Weyl states. In this work, we review and discuss the effects of using magneto-optical tools for studying quantum effects like the chiral anomaly or magnetic effects in magnetic Weyl and Dirac systems using the magneto-optical Kerr effect (MOKE) or Faraday systems including a single detection and imaging. Examples of using magneto-optical systems in the research of ultrafast magnetic dynamics of thin polycrystalline nickel and permaloy are reviewed as are the magnetic spatial dynamics by employing magneto-optical Kerr or Faraday microscopy tools with ferromagnetic thin films. Interestingly, the excitation of a circularly polarized femtosecond laser pulse could lead to the breakage of time-reversal symmetry and to the transformation of the Dirac state to the Floquet–Weyl semimetal state. The development of a suitable ultrafast magneto-optical system for Weyl systems is discussed, and the practical difficulties for the realization of such a system are considered.
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Guedri, Kamel, Shougi Suliman Abosuliman y Mowffaq Oreijah. "FTn Finite Volume Analysis of Ultrafast Laser Radiation Transport through Human Skin Cancer". Applied Sciences 10, n.º 20 (12 de octubre de 2020): 7090. http://dx.doi.org/10.3390/app10207090.

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In this work, we develop a numerical tool for the early detection of skin cancer using a 3D numerical transient radiative heat transfer study of ultrafast-laser transport through normal and malignant human skins. The curved-line advection method (CLAM) spatial scheme and the FTn angular scheme of the finite volume method (FVM) are investigated to analyze the above-cited physical phenomena. Both Fresnel specular and diffuse boundary conditions are analyzed. Human skin is considered based on optical properties available from other sources. The temporal radiative signals of skin with malignancies were compared to those of normal skin. Malignancies in the basal layer and epidermis were simulated. Further, the effects of laser light wavelength and the volume of the cancerous region and its scattering coefficient on these signals were studied. The results show that (1) the effect of the Fresnel boundary in the modeling was pronounced; (2) the peak magnitude for human skin with the cutaneous melanoma (CM) had the maximum value in comparison with those obtained for the two other malignancies; and (3) when cancer fully affected the living epidermis with any of these malignancies, the reflectance was more than its predicted value when affected by the basal only.
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Kuznetsov, Alex V. "S-Matrix Theory of Ultrafast Optical Phenomena in Semiconductors". Annals of Physics 258, n.º 2 (agosto de 1997): 157–209. http://dx.doi.org/10.1006/aphy.1997.5701.

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TSUCHIYA, Yutaka. "Imaging and Analysis of Ultra-Low-Light-Level Phenomena and Ultrafast Optical Phenomena". Review of Laser Engineering 13, n.º 1 (1985): 52–68. http://dx.doi.org/10.2184/lsj.13.52.

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Ferguson, A. I. "Ultrafast Phenomena IV. Chemical Physics Series Vol. 38". Optica Acta: International Journal of Optics 32, n.º 11 (noviembre de 1985): 1313. http://dx.doi.org/10.1080/716099682.

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Hurley, David H. y Oliver B. Wright. "Detection of ultrafast phenomena by use of a modified Sagnac interferometer". Optics Letters 24, n.º 18 (15 de septiembre de 1999): 1305. http://dx.doi.org/10.1364/ol.24.001305.

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Chaliasos, E. "Detection of black holes from optical phenomena". Monthly Notices of the Royal Astronomical Society 237, n.º 3 (1 de abril de 1989): 653–59. http://dx.doi.org/10.1093/mnras/237.3.653.

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Ferry, D. K. "Theory of ultrafast phenomena in laser-excited semiconductors". Semiconductor Science and Technology 9, n.º 11S (1 de noviembre de 1994): 1978–82. http://dx.doi.org/10.1088/0268-1242/9/11s/020.

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Haug, Hartmut. "Quantum Coherence in Ultrafast Semiconductor Spectroscopy". Journal of Nonlinear Optical Physics & Materials 07, n.º 02 (junio de 1998): 227–39. http://dx.doi.org/10.1142/s0218863598000193.

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Coherent optical phenomena such as the optical Stark effect, Rabi flopping, photon echo and quantum beating which are well-known in atomic spectroscopy can also be observed in semiconductors by using femtosecond laser pulses. On these short time scales, the quantum coherence of the optical excitations in the solid do not only influence the optical properties but change at the same time the relaxation and dephasing kinetics. The quasi-classical Boltzmann kinetics has to be replaced by quantum kinetics. Coherence leads to the appearance of memory in the scattering integrals. For femtosecond four-wave mixing and pump-and-probe spectroscopy the use of quantum kinetics for LO-phonon and for carrier-carrier scattering will be reviewed.
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Lavoie, C., C. Cabral, J. M. E. Harper, G. Tas, C. J. Morath, R. J. Stoner y H. J. Maris. "Detection of cobalt silicide phase formations by ultrafast optical measurements". Thin Solid Films 374, n.º 1 (octubre de 2000): 42–48. http://dx.doi.org/10.1016/s0040-6090(00)01191-3.

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Tesis sobre el tema "Optical detection of ultrafast phenomena"

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Papageorgiou, Georgios. "Ultrafast nonlinear optical phenomena in wide-bandgap II-VI semiconductor quantum wells". Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/2026.

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Català, García Carme. "Optical methods for ultrafast screening of microorganisms". Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/450874.

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En aquesta tesi doctoral hem desenvolupat un mètode per la detecció i quantificació múltiple dels microorganismes més comuns que causen infeccions bacterianes amb una velocitat de detecció sense precedents a baix cost i alta sensibilitat. A més a més, fent servir fluids humans reals directament evitant així, els pretractaments tediosos de les mostres. El disseny del sistema està basat en augments d'intensitat del senyal obtingut per espectroscòpia SERS. Això s'aconsegueix utilitzant nanopartícules plasmòniques codificades i funcionalitzades amb elements de reconeixement biològics. D'aquesta manera, quan una mostra conté el patogen a identificar interactua amb els elements de reconeixement units a les nanopartícules, induint la seva acumulació en la superfície del microorganisme. Aquesta agregació de partícules a la membrana dels bacteris produeix espais molt petits entre les partícules fent que el senyal Raman s'amplifiqui en diversos ordres de magnitud respecte a les partícules soltes. Permetent així, la identificació de múltiples microorganismes a la vegada. La quantificació d'aquests, s'aconsegueix passant la mostra a través d'un dispositiu de micro-fluids amb una finestra de recol•lecció on un làser interroga i classifica els agregats a temps real. A més a més, també hem investigat els avantatges de fer servir aptàmers en lloc d'anticossos com a elements de reconeixement biològic. Aquest nou sistema de detecció de patògens obre interessants perspectives per al diagnòstic ràpid i econòmic d'infeccions bacterianes.
En esta tesis doctoral hemos desarrollado un método para la detección y cuantificación múltiple de los microorganismos más comunes que causan infecciones bacterianas con una velocidad de detección sin precedentes a bajo coste y alta sensibilidad. Utilizando además, fluidos humanos reales directamente evitando así, pre-tratamientos tediosos de las muestras. El diseño del sistema está basado en aumentos de intensidad de la señal obtenida por espectroscopia SERS. Esto se logra utilizando nanopartículas plasmónicas codificadas y funcionalizadas con elementos de reconocimiento biológico. De esta manera, cuando una muestra que contiene el patógeno a identificar interactúa con los elementos de reconocimiento unidos a las nanopartículas, induce su acumulación en la superficie del microorganismo. Esta agregación de partículas en las membranas de las bacterias produce espaciados muy pequeños entre las partículas haciendo que la señal Raman se amplifique en varios órdenes de magnitud con respecto a las partículas sueltas. Permitiendo así la identificación de múltiples microorganismos a la vez. La cuantificación de los mismos, se logra pasando la muestra a través de un dispositivo de micro-fluidos con una ventana de recolección donde un láser interroga y clasifica los agregados en tiempo real. Además, también hemos investigado las ventajas de usar aptámeros frente a anticuerpos como elementos de reconocimiento biológico. Este nuevo sistema de detección de patógenos abre interesantes perspectivas para el diagnóstico rápido y barato de las infecciones bacterianas.
This doctoral thesis intended to develop and optimize a method for multiplex detection and quantification of the most common microorganisms causing bacterial infections. This detection approach envisions to directly use different real human fluids avoiding thus, tedious pre-treatments of the samples with an unprecedented speed, low cost, and sensitivity. The design of the system is based on variations in the SERS intensity. This is accomplished using encoded plasmonic nanoparticles functionalized with bio-recognition elements. Consequently, when a sample containing the biological target to be identified interacts with the recognition elements attached to the nanoparticle, will induce an accumulation of them at the surface of the targeted microorganism. This particle aggregation on the bacteria membranes renders a dense array of inter-particle gaps in which the Raman signal is amplified by several orders of magnitude relative to the dispersed particles, enabling a multiplexed deterministic identification of the microorganisms. Quantification is achieved by passing the sample through a microfluidic device with a collection window where a laser interrogates and classifies the bacteria–nanoparticle aggregates in real time. Additionally, a comparison between two of the most common bio-recognition elements (antibodies and aptamers) was performed. This new pathogen detection system opens exciting prospects for fast inexpensive diagnosis of bacterial infections.
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Lai, Yu Hang. "Strong Field Phenomena in Atoms and Molecules from Near to MidInfrared Laser Fields". The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1514852456303011.

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Pohl, Martin [Verfasser], Ilya [Akademischer Betreuer] Akimov y Heinz [Gutachter] Hövel. "Ultrafast optical phenomena in magneto-plasmonic crystals and magnetically ordered materials / Martin Pohl. Betreuer: Ilya Akimov. Gutachter: Heinz Hövel". Dortmund : Universitätsbibliothek Dortmund, 2014. http://d-nb.info/1105476111/34.

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ALMEIDA, Euclides Cesar Lins. "Ultrafast dynamics of nanoscale systems: NaNbO3 nanocrystals, colloidal silver nanoparticles and dye functionalized TiO2 nanoparticles". Universidade Federal de Pernambuco, 2012. https://repositorio.ufpe.br/handle/123456789/18659.

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O principal objetivo deste trabalho foi investigar fenômenos ópticos ultrarrápidos em sistemas nanoestruturados empregando diferentes técnicas espectroscópicas não lineares, tanto no domínio do tempo quanto no domínio da frequência. Para fornecer uma base adequada que permita entender os experimentos feitos nessa tese, os princípios físicos das espectroscopias ópticas não lineares são apresentados. Inicialmente é apresentada uma descrição da função resposta não linear no domínio do tempo. A evolução temporal da polarização óptica, que gera o sinal espectroscópico, é descrita em detalhes usando uma teoria de perturbação diagramática. Técnicas ópticas não lineares são apresentadas, tais como eco de fótons, bombeamento-e-sonda e hole burning, assim como o comportamento dinâmico de um material pode ser interpretado a partir do sinal gerado. A técnica de mistura degenerada de quatro ondas com luz incoerente foi usada para investigar, pela primeira vez, o defasamento ultrarrápido de éxcitons em uma vitrocerâmica contendo nanocristais de niobato de sódio. O tempo de defasamento medido (T2 = 20 fs) indica qu empregada para investigar processos de transferência de carga em colóides com nanopartículas de TiO2 e rodamina 6G. O comportamento do sinal de depleção transiente é comparado com o observado para a rodamina livre suspensa em etanol. A análise dos resultados permitiu atribuir o comportamento de depleção à transferência de carga de estados excitados termalizados das moléculas de corante para a banda de condução do semicondutor e a transferência no sentido inverso do semicondutor para as moléculas.
The main objective of this work was the investigation of ultrafast optical phenomena in selected nanostructured systems employing different nonlinear spectroscopic techniques, either in the time or the frequency domain. To provide an appropriate background to understand the performed experiments the principles of nonlinear optical spectroscopies are presented. Initially a description of the nonlinear optical response function in the time domain is given. The time evolution of the optical polarization, that gives rise to the spectroscopic signal, is described in detail using a diagrammatic perturbation theory. Nonlinear optical techniques are discussed such as photon echoes, pump-and-probe and hole-burning, as well as how the dynamical behavior of a material can be interpreted from the generated signals. The degenerate four-wave mixing technique with incoherent light was used to investigate for the first time the ultrafast dephasing of excitons in a glass-ceramic containing sodium niobate nanocrystals. The short dephasing time measured (T2 = 20 fs) indicates that different dephasing channels contribute for the excitonic dephasing, namely: electron-electron scattering, electron-phonon coupling and fast trapping of electrons in defects on the nanocrystals interface. Low-temperature luminescence experiments were also performed to measure excitonic and trap states lifetimes. The persistent spectral holeburning technique was applied to measure localized surface plasmons dephasing times in colloidal silver nanoparticles capped with different stabilizing molecules. The dependence of T2 with three different stabilizers was demonstrated and theoretically analyzed. The results show that the dephasing times are shorter than the theoretically calculated T2 using the bulk dielectric functions of the metal. This discrepancy is attributed to changes in the electronic density of states at the nanoparticles interface caused by the presence of the stabilizers. Ab-initio calculations based on the Density Functional Theory were performed to further understand the interaction between the nanoparticles and stabilizing agents. The femtosecond transient absorption technique was employed to study the ultrafast dynamics of in-gap states in a glassceramics containing sodium niobate nanocrystals. Two main temporal components were found for the excited state absorption signal: a fast component, with decay time of ≈ 1 ps, and a slower component which is attributed to deep trap states. This slower component is responsible for the excited state absorption contribution in optical limiting experiments previously reported in the literature. The dynamics of the optical limiting in this sample was also studied, in the millisecond range, exciting the sample with a train of femtosecond pulses. The optical limiting behavior reflects the dynamics of population in the excited and trap states and this dynamics was modeled using rate equations for the electronic states’ populations. Finally, the pump-andprobe transient absorption technique was employed to investigate charge-transfer processes in colloids with rhodamine 6G and TiO2 nanoparticles. The transient bleaching signal behavior is compared with the one observed for unlinked rhodamine 6G dissolved in ethanol. The analysis of the results allowed the attribution of the bleaching behavior to charge-transfer from thermalized excited states of the dye molecules to the semiconductor conduction band and to the back charge-transfer from the semiconductor to the molecules.
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Ducousso, Mathieu. "Acoustique picoseconde dans une cellule biologique individuelle". Phd thesis, Université Sciences et Technologies - Bordeaux I, 2010. http://tel.archives-ouvertes.fr/tel-00537030.

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L'acoustique picoseconde est une technique qui permet de générer et de détecter des ondes acoustiques de longueur d'onde submicrométrique par l'utilisation d'impulsions lumineuses ultrarapides (100 fs). Si la technique commence à être appliquée industriellement pour le contrôle non-destructif de films solides micrométriques, comme les microprocesseurs, très peu d'études concernent son application aux milieux liquides ou mous, malgré son potentiel unique pour les mesures acoustiques très hautes fréquences (supérieur à la dizaine de GHz). Ce travail de thèse dresse un premier panorama d'applications possibles de la technique d'acoustique picoseconde pour l'étude d'une cellule biologique unique, dont l'épaisseur peut être d'une centaine de nanomètres à quelques micromètres. Les résolutions atteintes permettent des applications pour l'imagerie et la tomographie acoustique d'une cellule unique par la détermination locale de ses propriétés physiques. Un modèle de simulation analytique est développé pour aider à la compréhension des signaux détectés et pour la résolution du problème inverse. La génération acoustique est simulée en résolvant les équations couplées de diffusion de la chaleur et de la propagation acoustique. La détection optique est ensuite étudiée en résolvant l'équation de Maxwell où les phénomènes thermiques et acoustiques perturbent l'indice optique du matériau. Pour les besoins expérimentaux, une enceinte biologique, étanche et thermostatée, est conçue. De même, le montage laser est adapté pour permettre une détection bicolore de l'onde acoustique se propageant dans la cellule. Enfin, un microscope combinant la visualisation des cellules par épifluorescence au dispositif laser expérimental est développé. Ce dernier permet de localiser précisément les éléments subcellulaires de la cellule, pour ensuite les étudier par acoustique picoseconde. La démonstration du potentiel de la méthode pour l'imagerie cellulaire et l'évaluation de sa sensibilité est faite sur cellule végétale. Ensuite, une mesure quantitative des propriétés viscoélastiques de cellules ostéoblastes (MC3T3-E1), adhérentes sur un matériau mimant une prothèse de titane, est réalisée. Puis, l'effet du peptide RGD et de la protéine BMP-2 sur les propriétés viscoélastiques de la cellule ostéoblaste est quantifié. Ce travail est réalisé en partenariat avec une équipe de recherche en bio-ingénierie et reconstruction tissulaire, l'U577.
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Jönsson, Olof. "Ultrafast Structural and Electron Dynamics in Soft Matter Exposed to Intense X-ray Pulses". Doctoral thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-331936.

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Investigations of soft matter using ultrashort high intensity pulses have been made possible through the advent of X-ray free-electrons lasers. The last decade has seen the development of a new type of protein crystallography where femtosecond dynamics can be studied, and single particle imaging with atomic resolution is on the horizon. The pulses are so intense that any sample quickly turns into a plasma. This thesis studies the ultrafast transition from soft matter to warm dense matter, and the implications for structural determination of proteins.                    We use non-thermal plasma simulations to predict ultrafast structural and electron dynamics. Changes in atomic form factors due to the electronic state, and displacement as a function of temperature, are used to predict Bragg signal intensity in protein nanocrystals. The damage processes started by the pulse will gate the diffracted signal within the pulse duration, suggesting that long pulses are useful to study protein structure. This illustrates diffraction-before-destruction in crystallography. The effect from a varying temporal photon distribution within a pulse is also investigated. A well-defined initial front determines the quality of the diffracted signal. At lower intensities, the temporal shape of the X-ray pulse will affect the overall signal strength; at high intensities the signal level will be strongly dependent on the resolution. Water is routinely used to deliver biological samples into the X-ray beam. Structural dynamics in water exposed to intense X-rays were investigated with simulations and experiments. Using pulses of different duration, we found that non-thermal heating will affect the water structure on a time scale longer than 25 fs but shorter than 75 fs. Modeling suggests that a loss of long-range coordination of the solvation shells accounts for the observed decrease in scattering signal. The feasibility of using X-ray emission from plasma as an indicator for hits in serial diffraction experiments is studied. Specific line emission from sulfur at high X-ray energies is suitable for distinguishing spectral features from proteins, compared to emission from delivery liquids. We find that plasma emission continues long after the femtosecond pulse has ended, suggesting that spectrum-during-destruction could reveal information complementary to diffraction.
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Padilha, Junior Lázaro Aurélio 1980. "Estudo de fenômenos ópticos ultra-rapidos lineares e não-lineares em pontos quânticos semicondutores". [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277411.

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Orientador: Carlos Henrique de Brito Cruz
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin
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Resumo: Nesta tese as propriedades ópticas lineares e não-lineares em pontos quânticos de semicondutores de band-gap diretos, CdTe e CdSe, são estudados em escala temporal de femtossegundos, especialmente aquelas propriedades importantes para aplicações em chaveamento totalmente óptico, como o tempo de resposta e a susceptibilidade de terceira ordem. Os processos de recombinação de elétrons fotoexcitados são investigados assim como seus tempos de resposta, usando um modelo teórico que considera a influência dos estados de armadilhas de superfície e da recombinação Auger. As propriedades ópticas não lineares de terceita ordem, absorção de dois fótons e efeito Kerr óptico, são estudados através de diferente técnicas experimentais: Z-scan, bombeio e prova e foto-luminescência excitada por dois fótons. Forte influência do tamanho dos nanocristais é observada, especialmente nos espectros de absorção de dois-fótons. Modelos teóricos baseados na aproximação de massa efetiva e no modelo p k de Kane são usados para descrever a influência do confinamento quântico nos processos de absorção de dois-fótons degenerados e não-degenerados. A importância da mistura das bandas de buracos é observada no ajuste teórico dos espectros de absorção de dois fótons. Finalmente, chaves totalmente ópticas operando por saturação de absorção e por controle de polarização são demonstradas para pontos quânticos de CdTe em matriz vítrea
Abstract: In this thesis the linear and non-linear optical properties of direct band-gap semiconductors, CdTe and CdSe, quantum dots are studied at femtosecond time scale, mainly those properties important for applications in all-optical switching such as response time and third order susceptibility. The photo-excited electron recombination processes are investigated as well their response time using a theoretical model considering the influence of the surface trapping states and the Auger recombination. The third order nonlinear optical properties, two-photon absorption and optical Kerr effect, are studied by different experimental techniques: Z-scan, pump and probe and two-photon induced photo-luminescence. Strong influence from the nanocrystals size is observed, especially on the two-photon absorption spectra. Theoretical models based on the effective mass approximation and Kane¿s p k model are used to describe the influence of the quantum confinement on the degenerate and non-degenerate two-photon absorption processes. The importance of the hole band mixing is easily seen from the two-photon absorption fitting. Finally, all-optical switching by absorption saturation and polarization control are demonstrated for CdTe quantum dots in doped glass
Doutorado
Propriedades Óticas e Espectroscopia da Matéria Condensada ; Outras Inter. da Matéria Com. Rad. e Part
Doutor em Ciências
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Dubois, Jonathan. "Electron dynamics for atoms driven by intense and elliptically polarized laser pulses". Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0297.

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Assujettir des atomes ou des molécules à des impulsions lasers de fortes intensités done lieu à une variété de phénomènes hautement non-linéaires, tels que par exemple l'ionisation des électrons et la radiation de photons de hautes fréquences. Les distributions des vitesses des électrons ionisés ou des fréquences des photons radiés encodent des informations pertinentes sur les atomes ou les molécules ciblés à l'échelle temporelle naturelle des électrons, l'attoseconde-qui est un millionième, d'un millionième, d'un millionième d'une seconde. Comprendre la dynamique des électrons ionisés ainsi qu'identifier les mécanismes de radiation de hautes fréquences sont des étapes essentielles afin d'interpréter et décoder les informations cryptées dans les mesures expérimentales.Dans cette thèse, des atomes soumis à des impulsions lasers de fortes intensités polarisées elliptiquement dans le régime infra-rouge sont étudiés théoriquement. Malgré leur nature fondamentalement quantique dans les atomes, les électrons manifestent certains comportements classiques lorsqu'ils sont sujets à des impulsions lasers de fortes intensités. Nous exploitons ces traits classiques pour comprendre et illustrer, à l'aide des trajectoires, les mécanismes physiques en jeu afin d'interpréter les résultats expérimentaux. Après ioniser, le mouvement des électrons est analysé en utilisant des techniques issues de la dynamique non-linéaire. Ce travail de thèse démontre la complémentarité de la mécanique quantique et de la dynamique non-linéaire pour comprendre et illustrer des mécanismes impliqués lorsque des atomes sont sujets à des impulsions lasers de fortes intensités polarisées elliptiquement
Subjecting atoms or molecules to intense laser pulses gives rise to a variety of highly nonlinear phenomena, such as for instance the ionization of electrons and the radiation of high-frequency photons. The distributions of the velocity of the ionized electrons of the frequency of the radiated photons measured at the detector encode relevant informations on the target atoms and molecules at the natural time scale of the electrons, the attosecond-that is, million, million, millionths of a second. Understanding the dynamics of the ionized electrons and identifying the mechanisms of high-frequency radiation are essential steps toward interpreting and decoding the informations encrypted in the experimental measurements.In this thesis, atoms subjected to intense and elliptically polarized laser fields in the infrared regime are theoretically studied. Despite their fundamental quantal nature in atoms, electrons display some classical behaviors when subjected to intense laser pulses. We exploit these classical features to understand and picture, with the help of trajectories, the physical mechanisms at play in order to interpret experimental measurements. After ionizing, the motion of the electrons is analyzed using techniques from nonlinear dynamics. This thesis work demonstrates the complementarity of quantum mechanics and nonlinear dynamics for understanding and illustrating the mechanisms involved when atoms are subjected to intense and elliptically polarized laser pulses
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"Metasurface-Based Optoelectronic Devices for Polarization Detection and Ultrafast Optical Modulation". Doctoral diss., 2020. http://hdl.handle.net/2286/R.I.62822.

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abstract: Optical metasurfaces, i.e. artificially engineered arrays of subwavelength building blocks supporting abrupt and substantial light confinement, was employed to demonstrate a novel generation of devices for circularly polarized detection, full-Stokes polarimetry and all-optical modulation with ultra-compact footprint and chip-integrability. Optical chirality is essential for generation, manipulation and detection of circularly polarized light (CPL), thus finds many applications in quantum computing, communication, spectroscopy, biomedical diagnosis, imaging and sensing. Compared to natural chiral materials, chiral metamaterials and metasurfaces enable much stronger chirality on subwavelength scale; therefore, they are ideal for device miniaturization and system integration. However, they are usually associated with low performance due to limited fabrication tolerance and high dissipation mainly caused by plasmonic materials. Here, a bio-inspired submicron-thick chiral metamaterial structure was designed and demonstrated experimentally with high contrast (extinction ratio >35) detection of CPL with different handedness and high efficiency (>80%) of the overall device. Furthermore, integration of left- and right-handed CPL detection units with nanograting linear polarization filters enabled full-Stokes polarimetry of arbitrarily input polarization states with high accuracy and very low insertion loss, all on a submillimeter single chip. These unprecedented highly efficient and high extinction ratio devices pave the way for on-chip polarimetric measurements. All-optical modulation is widely used for optical interconnects, communication, information processing, and ultrafast spectroscopy. Yet, there’s deficiency of ultrafast, compact and energy-efficient solutions all in one device. Here, all-optical modulation of light in the near- and mid-infrared regimes were experimentally demonstrated based on a graphene-integrated plasmonic nanoantenna array. The remarkable feature of the device design is its simultaneous near-field enhancement for pump and probe (signal) beams, owing to the localized surface plasmon resonance excitation, while preserving the ultrafast photocarrier relaxation in graphene. Hence, a distinct modulation at 1560nm with record-low pump fluence (<8μJ/cm^2) was reported with ~1ps response time. Besides, relying on broadband interaction of graphene with incident light, a first-time demonstration of graphene-based all-optical modulation in mid-infrared spectral region (6-7μm) was reported based on the above double-enhancement design concept. Relying on the tunability of metasurface design, the proposed device can be used for ultrafast optical modulation from near-infrared to terahertz regime.
Dissertation/Thesis
Doctoral Dissertation Electrical Engineering 2020
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Libros sobre el tema "Optical detection of ultrafast phenomena"

1

Tsen, Kong-Thon. Ultrafast Phenomena in Semiconductors. New York, NY: Springer New York, 2001.

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2

Song, Jin-Joo. Ultrafast phenomena in semiconductors and nanostructure materials XIV: 24-27 January 2010, San Francisco, California, United States. Editado por SPIE (Society). Bellingham, Wash: SPIE, 2010.

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V, Shuvalov Vladimir, Zheltikov Alexei M, Scientific Council for Coherent and Nonlinear Optics (Rossiīskai͡a︡ akademii͡a︡ nauk. y Society of Photo-optical Instrumentation Engineers., eds. ICONO '95: Nonlinear spectroscopy and ultrafast phenomena, 27 June-1 July, 1995, St. Petersburg, Russia. Bellingham, Wash: SPIE, 1996.

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4

N, Drabovich Konstantin, Akadėmii͡a︡ navuk Belarusi y Society of Photo-optical Instrumentation Engineers., eds. ICONO 2001: Nonlinear optical phenomena and Nonlinear dynamics of optical systems : 26 June-1 July 2001, Minsk, Belarus. Bellingham, Washington: SPIE, 2002.

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ICONO '98 (1998 Moscow, Russia). ICONO '98: Ultrafast phenomena and interaction of superstrong laser fields with matter--nonlinear optics and high-field physics : 29 June-3 July 1998, Moscow, Russia. Editado por Fedorov M. V. 1940-, Scientific Council for Coherent and Nonlinear Optics (Rossiĭskai͡a akademii͡a nauk) y Russia (Federation). Ministerstvo nauki i tekhnologiĭ. Bellingham, Wash: SPIE--the International Society for Optical Engineering, 1999.

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Ultrafast Phenomena in Semiconductors. Springer, 2000.

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7

Eriksson, Olle, Anders Bergman, Lars Bergqvist y Johan Hellsvik. Ultrafast Switching Dynamics. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198788669.003.0011.

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The time-integrated amount of data and stored information, is doubled roughly every eighteen months, and since the majority of the worlds information is stored in magnetic media, the possibility to write and retrieve information in a magnetic material at ever greater speed and with lower energy consumption, has obvious benefits for our society. Hence the seemingly simple switching of a magnetic unit, a bit, is a crucial process which defines how efficiently information can be stored and retrieved from a magnetic memory. Of particular interest here are the concepts of ultrafast magnetism and all-optical control of magnetism which have in recent decades become the basis for an intense research field. The motivation is natural; the mechanisms behind these phenomena are far from trivial and the technological implications are huge.
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Thon, Tsen Kong y Society of Photo-optical Instrumentation Engineers., eds. Ultrafast phenomena in semiconductors and nanostructure materials XI and Semiconductor photodetectors IV: 22-24 January, 2007, San Jose, California, USA. Bellingham, Wash: SPIE, 2007.

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9

(Editor), M. V. Fedorov, Vyacheslav M. Gordienko (Editor), Vladimir V. Shuvalov (Editor) y Vladimir D. Taranukhin (Editor), eds. Ultrafast Phenomena and Interaction of Superstrong Laser Fields With Matter: Nonlinear Optics and High-Field Physics : 29 June-3 July 1998, Moscow, Russia (Icono '98). SPIE-International Society for Optical Engine, 1999.

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Valenzuela, S. O. y T. Kimura. Experimental observation of the spin Hall effect using electronic nonlocal detection. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198787075.003.0014.

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This chapter shows how the spin Hall effect (SHE) has been described as a source of spin-polarized electrons for electronic applications without the need for ferromagnets or optical injection. Because spin accumulation does not produce an obvious measurable electrical signal, electronic detection of the SHE proved to be elusive and was preceded by optical demonstrations. Several experimental schemes for the electronic detection of the SHE had been originally proposed, including the use of ferromagnetic electrodes to determine the spin accumulation at the edges of the sample. However, the difficulty of sample fabrication and the presence of spin-related phenomena such as anisotropic magnetoresistance or the anomalous Hall effect in the ferromagnetic electrodes could mask or even mimic the SHE signal in the sample layouts.
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Capítulos de libros sobre el tema "Optical detection of ultrafast phenomena"

1

van der Valk, N. C. J., W. Th Wenckebach y P. C. M. Planken. "Electro-optic detection of sub-wavelength THz spot sizes in the near-field of a metal tip". En Ultrafast Phenomena XIII, 295–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59319-2_92.

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Astinov, V., K. J. Kubarych, C. J. Milne, S. Lin y R. J. Dwayne Miller. "Diffractive optics based 2-colour six wave mixing: heterodyne detection of the fifth-order Raman response of liquids". En Ultrafast Phenomena XII, 510–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56546-5_149.

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Saruwatari, M., K. Nakagawa, S. Kawanishi y A. Takada. "Advanced Optical Communications Technologies Utilizing Ultrashort Optical Pulses". En Ultrafast Phenomena VI, 164–68. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83644-2_47.

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Hirlimann, Charles y Benjamin Thomas. "Induced Optical Tunnelling". En Ultrafast Phenomena XIII, 502–4. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59319-2_156.

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Stone, Katherine W., Thomas Hornung, Joshua C. Vaughan y Keith A. Nelson. "Coherently Controlled Multidimensional Optical Spectroscopy". En Ultrafast Phenomena XV, 371–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_120.

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Kafka, J. D., J. W. Pieterse y M. L. Watts. "A Subpicosecond Optical Sampling System". En Ultrafast Phenomena VIII, 116–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84910-7_30.

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Kobayashi, T., A. Morimoto, M. Doi, Bong Young Lee y T. Sueta. "Picosecond to Femtosecond Optical Synthesizers". En Ultrafast Phenomena VI, 135–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-83644-2_39.

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Nakamura, Kazutaka G., Yoichiro Hironaka, Jun Irisawa, Ken-ichi Kondo, Kunie Ishioka y Masahiro Kitajima. "Ultrafast X-ray diffraction and Optical Reflection Measurements of Coherent Optical Phonons of CdTe". En Ultrafast Phenomena XV, 731–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_234.

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Gu, Xun, Mark W. Kimmel, Erik Zeek, Patrick O’Shea, Rick Trebino y Robert S. Windeler. "Cross-correlation frequency-resolved optical gating measurements of ultrabroadband continuum from microstructure optical fiber". En Ultrafast Phenomena XIII, 193–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59319-2_59.

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Omenetto, Fiorenzo G., Dzmitry Yarotski y Antoinette J. Taylor. "Femtosecond Pulse Propagation in Optical Fibers". En Ultrafast Phenomena XII, 186–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56546-5_55.

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Actas de conferencias sobre el tema "Optical detection of ultrafast phenomena"

1

Hirlimann, C., O. Crégut, S. Haacke, N. Le Cong, J. L. Rehspringer y S. Lecler. "Nonlinear Optical Detection of Photonic Jets". En International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/up.2006.tue6.

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Schmitt-Sody, A., K. Masuda, A. Velten y J. C. Diels. "Optical Magnetic Field Detection: Intracavity Phase Interferometry". En International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/up.2010.the3.

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Mitrofanov, A. V., A. J. Verhoef, E. E. Serebryannikov, J. Lumeau, L. Glebov, A. M. Zheltikov y A. Baltuška. "Optical Detection of Attosecond Ionization Dynamics in Transparent Solids". En International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/up.2010.fb2.

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Cieslik, William C. y Kenneth J. Kaufmann. "Detection of ultrafast phenomena with streak cameras and PMTs". En Symposium on Integrated Optics, editado por Hongxing Jiang, Kong-Thon F. Tsen y Jin-Joo Song. SPIE, 2001. http://dx.doi.org/10.1117/12.424731.

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Astinov, V., K. J. Kubarych, C. J. Milne y R. J. Dwayne Miller. "Diffractive optics based 2-color six wave mixing: heterodyne detection of the fifth-order Raman response of liquids". En International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2000. http://dx.doi.org/10.1364/up.2000.wd1.

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Hirlimann, Charles y Benjamin Thomas. "Induced Optical Tunnelling". En International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2002. http://dx.doi.org/10.1364/up.2002.tue25.

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Thibault, Simon, Charles Pichette, Pierre Marquet y Michel Piché. "Ultrafast optical pulse from non-paraxial beam-shaping to optical metrology (Conference Presentation)". En Ultrafast Phenomena and Nanophotonics XXIV, editado por Markus Betz y Abdulhakem Y. Elezzabi. SPIE, 2020. http://dx.doi.org/10.1117/12.2542108.

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8

Stone, Katherine W., Thomas Hornung, Joshua C. Vaughan y Keith A. Nelson. "Coherently Controlled Multidimensional Optical Spectroscopy". En International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/up.2006.fa3.

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9

Nakamura, Kazutaka G., Yoichiro Hironaka, Jun Irisawa, Ken-ichi Kondo, Kunie Ishioka y Masahiro Kitajima. "Ultrafast X-ray diffraction and Optical Reflection Measurements of Coherent Optical Phonons of CdTe". En International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/up.2006.mh8.

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Gu, Xun, Mark W. Kimmel, Erik Zeek, Patrick O’Shea, Rick Trebino y Robert S. Windeler. "Cross-correlation frequency-resolved-optical-gating measurements of ultrabroadband continuum from microstructure optical fiber". En International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2002. http://dx.doi.org/10.1364/up.2002.wa2.

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Informes sobre el tema "Optical detection of ultrafast phenomena"

1

Vernon, S. y M. Lowry. Ultrafast Radiation Detection by Modulation of an Optical Probe Beam. Office of Scientific and Technical Information (OSTI), febrero de 2006. http://dx.doi.org/10.2172/877884.

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Gedik, Nuh. Optical Manipulation and Detection of Emergent Phenomena in Topological Insulators. Office of Scientific and Technical Information (OSTI), febrero de 2017. http://dx.doi.org/10.2172/1344100.

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