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Dissertations / Theses on the topic 'Ultrafast pump-probe spectroscopy'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Walke, Daniel John. "New instrumentation and methods for ultrafast pump-probe spectroscopy." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/48040.

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Recent advances have led to the demonstration of trains of attosecond pulses and isolated attosecond pulses in the vacuum ultraviolet (VUV) and extreme ultraviolet (XUV) regions of the electromagnetic spectrum in a number of laboratories. This has raised the possibility of direct time resolved measurements of correlation driven electron dynamics within molecules, with a long term aim of unprecedented control over the dynamics of matter at atomic and molecular length scales. Particular interest has arisen towards the possibility of a charge migration mechanism within molecules, in which purely

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2

Cheng, Yu-Hsiang. "Photoinduced dynamics studied by ultrafast single-shot pump-probe spectroscopy." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122684.

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This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 155-168).<br>This thesis focuses on the development of dual-echelon single-shot spectroscopy and its applications to study irreversible photoinduced dynamics. First, the ultrafast laser sources and the related control and chara

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3

Griessel, Annelle. "The investigation of resveratrol with conventional and ultrafast pump-probe spectroscopy techniques." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/3098.

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Thesis (MSc (Physics))--University of Stellenbosch, 2009.<br>An ultrafast pump-probe spectroscopy experiment was developed in order to investigate the fast photoinduced isomerization reaction of the molecule resveratrol. Characteristics of the resveratrol molecule are discussed, including the photoisomerization reaction from trans- to cis-resveratrol. The experimental setup for the conventional spectroscopy measurement was developed and characterized in order to investigate and understand the conventional absorption and uorescence spectroscopy of resveratrol thoroughly. The absorption s

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4

Wen, Xiaoming, and n/a. "Ultrafast spectroscopy of semiconductor nanostructures." Swinburne University of Technology, 2007. http://adt.lib.swin.edu.au./public/adt-VSWT20070426.110438.

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Semiconductor nanostructures exhibit many remarkable electronic and optical properties. The key to designing and utilising semiconductor quantum structures is a physical understanding of the detailed excitation, transport and energy relaxation processes. Thus the nonequilibrium dynamics of semiconductor quantum structures have attracted extensive attention in recent years. Ultrafast spectroscopy has proven to be a versatile and powerful tool for investigating transient phenomena related to the relaxation and transport dynamics in semiconductors. In this thesis, we report investigations into th

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5

ARESTI, MAURO. "Ultrafast Optical Spectroscopy Techniques applied to colloidal nanocrystals." Doctoral thesis, Università degli Studi di Cagliari, 2014. http://hdl.handle.net/11584/266450.

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In this thesis I will describe my experimental work based on ultrafast optical spectroscopy techniques applied to colloidal nanocrystals. Colloidal semiconductor nanocrystals in recent years have attracted a lot of attention in particular in optoelectronic applications, because they present unique optical, electronic and charge carrier transport properties that can be easily modified via colloidal chemical synthesis. In the first chapter of this thesis, I will introduce the basic concepts of nanocrystals and their optical properties, I will consider some simple models to explain the physic

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6

Cavanagh, Molly Christine. "Using the ultrafast pump-probe spectroscopy of atomic anions and the solvated electron to probe solvent structure and solvation dynamics." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1581642021&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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7

Leitner, Torsten [Verfasser], and Wolfgang [Akademischer Betreuer] Eberhardt. "Ultrafast processes in molecules visualized with femtosecond pump-probe photoelectron spectroscopy / Torsten Leitner. Betreuer: Wolfgang Eberhardt." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1029192677/34.

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8

Doig, Katie I. "Ultrafast and continuous-wave spectroscopy of multiferroic oxide thin films." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:e44e0a2a-a675-4923-90de-a1bdfa24f184.

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Thin film multiferroic oxides with co-existing ferroelectric and ferromagnetic ordering have attracted much interest in recent years, partly as a result of the enhancements achieved through the adoption of strained thin film geometries. This thesis presents work on two such thin film oxides; lanthanide substituted BiFeO<sub>3</sub> and Fe substituted PbTiO<sub>3</sub>. Coherent magnons and acoustic phonons were impulsively excited and probed in thin films of the room temperature multiferroic Bi<sub>1-x-y</sub>Dy<sub>x</sub>La<sub>y</sub>FeO<sub>3</sub> using femtosecond laser pulses. The elast

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9

Gador, Niklas. "Experimental studies of dynamics in gas-phase diatomic molecules. From lifetime-measurements of BaF tofemtosecond pump-probe spectroscopy of Rb2." Licentiate thesis, KTH, Physics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1457.

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10

ESPOSITO, MARTINA. "A new spectroscopic approach to collective excitations in solids: pump-probe quantum state tomography." Doctoral thesis, Università degli Studi di Trieste, 2016. http://hdl.handle.net/11368/2908073.

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In a classical description the displacement of the atoms along the vibrational eigenmodes of a crystal can be measured with unlimited precision. Conversely, in the quantum formalism positions and momenta of the atoms can be determined simultaneously only within the boundary given by the Heisenberg uncertainty principle. For this reason, in real materials, in addition to the thermal disorder, the atomic displacements are subject to fluctuations which are intrinsic to their quantum nature. Because a crystalline solid has symmetries, these vibrations can be analyzed in terms of collective modes o

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11

Singh, Asmita. "Illuminating the ultrafast excited state dynamics of protein-bound carotenoids in plants." Diss., University of Pretoria, 2017. http://hdl.handle.net/2263/63170.

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Global energy demands have escalated over the past few decades, creating a necessity for alternative energy sources. Solar technologies inspired by the primary solar energy storing process known on earth, photosynthesis, have subsequently gained popularity. The natural photosynthetic apparatus comprises a network of membrane-bound pigment-protein complexes, with the main plant light-harvesting complex (LHCII) consisting of chlorophyll (Chl) and carotenoid (Car) pigments. Electronic excitation energy transfer (ET) of the harvested energy takes place amongst these pigments on ultrafast timescale

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12

MONTANARO, ANGELA. "Non-equilibrium response of quantum materials to resonant low-energy electronic photo-excitations." Doctoral thesis, Università degli Studi di Trieste, 2022. http://hdl.handle.net/11368/3030498.

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The properties of quantum materials are determined by the delicate balance among many interacting degrees of freedom. The existence of several competing orders makes these systems highly susceptible to even small perturbations that can induce giant responses and eventually change the macroscopic state of the material. The microscopic understanding of the intricate interplay between electrons, ions and spins is thus the key to attain new material functionalities. Pump-probe optical experiments are a powerful tool to study the non-equilibrium states of quantum materials, offering unique insight

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13

Rohwer, Egmont J. "Development of a non-collinearly phase matched optical parametric amplifier and application in pump-probe spectroscopy." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6607.

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14

Olitzky, Joshua D. "Time and Frequency Resolved Pump Probe Spectroscopy and Growth of Near Surface Quantum Confined Semiconductors Coupled to Metallic Nanostructures." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/595980.

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Metallic nano-structures provide for new and exciting domains to investigate light-matter interactions. The coupling of these metallic nano-structures to semiconductor emitters allows for the observation of cavity QED effects including Purcell enhancement and Vacuum Rabi splitting. The focus of this dissertation will be to present an introduction and background to semiconductor optics, and metallic metamaterial systems. This will be followed by the presentation of the spectroscopy systems designed and constructed during my tenure as graduate student and the experimental data obtained with thes

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15

Rivett, Jasmine Pamela Helen. "Charge carrier dynamics of lead halide perovskites probed with ultrafast spectroscopy." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/275095.

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In this thesis, we investigate the nature of charge carrier generation, relaxation and recombination in a range of lead halide perovskites. We focus on understanding whether the photophysical behaviour of these perovskite materials is like that of highly-ordered inorganic crystalline semiconductors (exhibiting ballistic charge transport) or disordered molecular semiconductors (exhibiting strong electron-phonon coupling and highly localised excited states) and how we can tune these photophysical properties with inorganic and organic additives. We find that the fundamental photophysical properti

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16

Chouthe, Sumedha [Verfasser], Heinrich [Akademischer Betreuer] Graener, Marius [Akademischer Betreuer] Grundmann, and Jürgen [Akademischer Betreuer] Christen. "Ultrafast dynamics of ZnO films using femtosecond pump probe spectroscopy / Sumedha Chouthe. Betreuer: Heinrich Graener ; Marius Grundmann ; Jürgen Christen." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2010. http://d-nb.info/1024976068/34.

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17

Kiel, Mareike. "Static and ultrafast optical properties of nanolayered composites : gold nanoparticles embedded in polyelectrolytes." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2012/6182/.

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In the course of this thesis gold nanoparticle/polyelectrolyte multilayer structures were prepared, characterized, and investigated according to their static and ultrafast optical properties. Using the dip-coating or spin-coating layer-by-layer deposition method, gold-nanoparticle layers were embedded in a polyelectrolyte environment with high structural perfection. Typical structures exhibit four repetition units, each consisting of one gold-particle layer and ten double layers of polyelectrolyte (cationic+anionic polyelectrolyte). The structures were characterized by X-ray reflectivity measu

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18

Kolodziej, Charles. "Laser Spectroscopic Studies of Ultrafast Charge Transfer Processes in Solar Cell Materials." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1586371698913592.

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19

McCabe, David J. "The formation of ultracold rubidium molecules using ultrafast photoassociation." Thesis, University of Oxford, 2010. http://ora.ox.ac.uk/objects/uuid:65e44f72-1995-45f0-8751-898735e54b6e.

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The establishment of robust laser-cooling techniques for the formation of ultracold atoms has provided a test-bed for low-temperature science, with scattering events changing character from incoherent thermal interactions to coherent quantum mechanical events. A natural extension is the pursuit of ultracold molecules in prescribed low-energy internal states. Atomic cooling techniques, however, do not generalize to the molecular regime due to the complex energy-level structure afforded by its extra degrees of motion. An indirect approach to ultracold molecule formation - photoassociation using

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20

Challa, Jagannadha Reddy. "Electronic and Vibrational Dynamics of Heme Model Compounds-An Ultrafast Spectroscopic Study." Case Western Reserve University School of Graduate Studies / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=case1181323422.

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21

Zhang, Bo. "Experimental Studies of Quantum Dynamics and Coherent Control in Homonuclear Alkali Diatomic Molecules." Doctoral thesis, KTH, Physics, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3420.

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<p>The main theme covered in this thesis is experimentalstudies of quantum dynamics and coherent control in homonuclearalkali diatomic molecules by ultrafast laser spectroscopy iththe implementation of pump-probe techniques.</p><p>A series of experiments have been performed on the Rb2molecules in a molecular beam as well as in a thermal oven. Thereal-time molecular quantum dynamics of the predissociatingelectronically excited D(3)<sup>1</sup>Πu state of Rb<sub>2</sub>, which couples to/intersects several otherneighbouring states, is investigated using wavepackets. Thepredissociation of the D s

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22

Zheldakov, Igor. "Ultrafast Photophysics and Photochemistry Of Hexacoordinated Bromides of Pt(IV), Os(IV), and, Ir(IV) in the Condensed Phase Studied by Femtosecond Pump-Probe Spectroscopy." Bowling Green State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1279998360.

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23

Kadi, Malin. "Ultrafast Photo-induced Reaction Dynamics of Small Molecules." Doctoral thesis, Uppsala University, Department of Physical Chemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3597.

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<p>The main focus of this thesis is the investigation of the dissociation dynamics of aryl halides using femtosecond pump-probe spectroscopy. In the monohalogenated aryl halides, iodo-, bromo- and chlorobenzene, the rate of dissociation following excitation at 266 nm in the gas phase increased with increasing mass of the halogen atom. This process was assigned to predissociation of the initially excited singlet (π, π*) state via a repulsive triplet (n, σ*) state due to spin-orbit interaction. In addition to the predissociative mechanism, a direct dissociation channel was observed in iodobenzen

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24

Matveev, Sergey M. "Photophysics and photochemistry of diiodomethane and hexabromoiridate - paradigm molecules for organic and inorganic chemistry - studied with sub-50-fs broadband pump-probe spectroscopy." Bowling Green State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1467909513.

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25

Rouxel, Romain. "Ultrafast thermo-optical dynamics of single plasmonic nanoparticles." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSE1306.

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Les changements de propriétés dynamiques de nanodisques d'or individuels supportés sur un substrat de saphir ont été étudiés sur des échelles de temps allant de la femtoseconde à la nanoseconde par la combinaison des techniques de spectroscopie par modulation spatiale et de spectroscopie optique résolue en temps. Les nanodisques sont mis hors-équilibre par l’absorption d’une impulsion optique de pompe, et leur relaxation est sondée optiquement par la mesure de la transmission d’une seconde impulsion. Dans la première partie de ce travail, la dynamique du transfert de chaleur du nano-objet au s

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26

Nontapot, Kanokwan. "Time-Resolved Studies of Magnetic and Non-Magnetic Narrow-Gap Semiconductors." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28712.

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In recent years, spin relaxation, injection, and manipulation in semiconductors have attracted considerable interest because of several potential applications in "spintronic" devices and the necessity to understand and control spin-based phenomena. In light of the growing interest in spin-related phenomena and devices, there is now renewed interest in the science and engineering of narrow gap semiconductors (NGS). NGS based heterostructures are particularly interesting for spintronic applications due to their large spin-orbit coupling, which leads to considerable zero-field spin splitting. NG

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27

Panais, Clément. "Ultrafast energy transfers at the nanoscale : cooling and vibrational dynamics of single supported metal nano-objects." Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10251.

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Ce travail de thèse porte sur l'étude optique des propriétés thermiques et vibrationnelles de nano-objets métalliques. Deux techniques optiques opérant à l’échelle du nano-objet unique (la spectroscopie par modulation spatiale et la spectroscopie pompe-sonde résolue en temps) ont été utilisées pour localiser des nanodisques d’or individuels déposés aléatoirement sur un substrat solide, caractériser leurs propriétés optiques et étudier leur dynamique ultrarapide. La première partie de ce travail décrit l'étude optique du refroidissement de nanodisques d'or colloïdaux déposés sur des substrats d

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28

Lejman, Mariusz. "Ultrafast photogeneration and photodetection of coherent acoustic phonons in ferroelectric BiFeO3." Thesis, Le Mans, 2015. http://www.theses.fr/2015LEMA1015/document.

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La technique d’optique ultra-rapide pompe-sonde, qui repose sur l’emploi de lasers à impulsion ultracourte(femtoseconde), permet de déclencher et étudier des processus ultrarapides dans la matière. L’acoustique picoseconde concerne pour sa part l’étude des processus de génération et détection de phonons acoustiques haute fréquence ainsi quel’analyse des nanomatériaux avec ces phonons (nanoéchographie). Les travaux de recherche de cette thèse avaient pourbut l’étude des couplages électronphonon acoustique dans le matériau ferroélectrique BiFeO3 par acoustique ultrarapide. Nous avons pu mettre e

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Walter, Arne. "Lichtinduzierte Primärprozesse in reversibel photoschaltbaren fluoreszierenden Proteinen: Zeitaufgelöste Spektroskopie von Padron0.9 und rsFastLime." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2014. http://hdl.handle.net/11858/00-1735-0000-0022-5FE5-5.

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30

Engel, Egbert. "Ultrafast exciton relaxation in quasi-one-dimensional perylene derivatives." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1143653858595-30675.

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This thesis deals with exciton relaxation processes in thin polycrystalline films and matrix-isolated molecules of the perylene derivatives PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride) and MePTCDI (N,N'-dimethylperylene-3,4,9,10-dicarboximide). Using femtosecond pump-probe spectroscopy, transient absorption spectra, excitonic relaxation in the lowest excited state subsequent to excitation, and exciton-exciton interaction and annihilation at high excitation densities have been addressed. Transient absorption spectroscopy in the range 1.2eV-2.6eV has been applied to thin polycrystalline

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31

Engel, Egbert. "Ultrafast exciton relaxation in quasi-one-dimensional perylene derivatives." Doctoral thesis, Technische Universität Dresden, 2005. https://tud.qucosa.de/id/qucosa%3A24681.

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This thesis deals with exciton relaxation processes in thin polycrystalline films and matrix-isolated molecules of the perylene derivatives PTCDA (3,4,9,10-perylenetetracarboxylic dianhydride) and MePTCDI (N,N'-dimethylperylene-3,4,9,10-dicarboximide). Using femtosecond pump-probe spectroscopy, transient absorption spectra, excitonic relaxation in the lowest excited state subsequent to excitation, and exciton-exciton interaction and annihilation at high excitation densities have been addressed. Transient absorption spectroscopy in the range 1.2eV-2.6eV has been applied to thin polycrystalline

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32

Faleiros, Marcelo Meira. "Espectroscopia ultrarrápida do polímero semicondutor luminescente MEH-PPV com excitação no ultravioleta." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-06122012-084909/.

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A indústria optoeletrônica passa por um período de transformação em que os materiais inorgânicos estão sendo substituídos pelos orgânicos, oligômeros e polímeros, na fabricação de alguns tipos de dispositivos. No entanto, fatores como baixa eficiência e tempo de vida impedem que os aparelhos com base nos polímeros entrem definitivamente no mercado. Para resolver estas questões, é necessário um conhecimento profundo da estrutura eletrônica desses materiais. Apesar do avanço científico, ainda existem pontos a esclarecer. Por exemplo, não existe um consenso sobre a natureza das excitações óticas

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33

Grüner, Barbara, Martin Schlesinger, Philipp Heister, Walter T. Strunz, Frank Stienkemeier, and Marcel Mudrich. "Vibrational relaxation and dephasing of Rb2 attached to helium nanodroplets." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-138750.

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The vibrational wave-packet dynamics of diatomic rubidium molecules (Rb2) in triplet states formed on the surface of superfluid helium nanodroplets is investigated both experimentally and theoretically. Detailed comparison of experimental femtosecond pump–probe spectra with dissipative quantum dynamics simulations reveals that vibrational relaxation is the main source of dephasing. The rate constant for vibrational relaxation in the first excited triplet state 13Σ+g is found to be constant γ ≈ 0.5 ns−1 for the lowest vibrational levels v [less, similar] 15 and to increase sharply when exciting

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34

Grüner, Barbara, Martin Schlesinger, Philipp Heister, Walter T. Strunz, Frank Stienkemeier, and Marcel Mudrich. "Vibrational relaxation and dephasing of Rb2 attached to helium nanodroplets." Royal Society of Chemistry, 2011. https://tud.qucosa.de/id/qucosa%3A27778.

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The vibrational wave-packet dynamics of diatomic rubidium molecules (Rb2) in triplet states formed on the surface of superfluid helium nanodroplets is investigated both experimentally and theoretically. Detailed comparison of experimental femtosecond pump–probe spectra with dissipative quantum dynamics simulations reveals that vibrational relaxation is the main source of dephasing. The rate constant for vibrational relaxation in the first excited triplet state 13Σ+g is found to be constant γ ≈ 0.5 ns−1 for the lowest vibrational levels v [less, similar] 15 and to increase sharply when exciting

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Mondal, Rajib. "Synthesis and Study of Higher Poly(Acene)s: Hexacene, Heptacene, and Derivatives." Bowling Green, Ohio : Bowling Green State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1187812264.

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Terschlüsen, Joachim A. "Constructing and Commissioning HELIOS – A High Harmonic Generation Source for Pump-Probe Measurements with sub 50 fs Temporal Resolution : The Development of Experimental Equipment for Extreme Ultraviolet Spectroscopy." Doctoral thesis, Uppsala universitet, Molekyl- och kondenserade materiens fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-281298.

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This thesis presents HELIOS, an in-house laboratory for time-resolved pump-probe spectroscopy with extreme-ultraviolet (XUV) probe radiation. A wide span of pump wavelengths can be generated using commercial laser equipment while XUV probe radiation is generated via a high harmonic generation process in a noble gas delivering probe photons with energies between 20 eV and 72 eV. The XUV beam path features a time-preserving monochromator and was constructed and built in-house. HELIOS features an overall time resolution of about 50 fs when using 800 nm pump and 41 eV probe photons. An energy reso

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Sinning, Steffen. "Ultraschnelle optoelektronische und Materialeigenschaften von Stickstoff-haltigem GaAs." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1144482170985-90756.

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This work summarizes properties of nitrogen containing GaAs, which are relevant for optoelectronic application and allow a deeper insight in the physics of this material. In the first part the dependence of the banggap energy of nitrogen implanted GaAs on several process parameters (implanted nitrogen concentration, implantation temperature, annealing duration and temperature) is investigated. The second part focuses on the relaxation dynamics of highly excited carriers. For this, the carrier relaxation dynamics in nitrogen implanted GaAs, in epitaxially grown GaAsN and in (pure) GaAs are inve

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Sinning, Steffen. "Ultraschnelle optoelektronische und Materialeigenschaften von Stickstoff-haltigem GaAs." Doctoral thesis, [S.l.] : [s.n.], 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979642523.

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Lantz, Gabriel. "Ultrafast electron dynamics in Mott materials." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112014/document.

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Les isolants de Mott sont un exemple parfait de l’impact des corrélations électroniques locales sur les propriétés macroscopiques des matériaux. En variant légèrement le dopage ou la pression, un métal peut se transformer en un isolant. Ces propriétés peuvent être modifiées de manière très rapide en plaçant ces matériaux loin de l'équilibre. Nous avons étudié un prototype de Mott-Hubbard, V2O3 dopé en Cr, en utilisant l'état de l’art des techniques pompe-sonde, à savoir la photoémission résolue en angle, la réflectivité optique, la spectroscopie THz, et la diffraction des rayons X. La réponse

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Villafana, Tana Elizabeth. "Ultrafast Pump-Probe Microscopy in Cultural Heritage Research." Diss., 2015. http://hdl.handle.net/10161/9934.

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<p>The materials and working method of a painting can reveal important information about our cultural history, as well as lend the conservator the necessary knowledge for treatment options. The removal of a cross-section sample reveals the three-dimensional (3d) structure of the painting and can be used to identify materials. However, cross-section samples are destructive and provide only local information. Nonlinear optical ultrafast pump-probe microscopy, originally developed for biomedical imaging, can provide high resolution 3d images with chemical contrast. In this dissertation, I adapt

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Chiu, Man-Li, and 邱曼麗. "Ultrafast Dynamics in Multilayer Graphene Studied by Femtosecond Pump-Probe Spectroscopy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/49437613428430188002.

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碩士<br>國立交通大學<br>電子物理系所<br>100<br>In this thesis, we study ultrafast dynamics of chemical vapor deposition multilayer graphene by the femtosecond spectroscopy. Graphene film which growth by chemical vapor deposition were transferred to the sapphire substrate. By repeating above steps we can obtain the multilayer graphene samples. Graphene could be applied to electro-optical devices potentially due to its extraordinary optical and electrical properties. Understanding the carriers cooling, carrier-carrier scattering and carrier dynamics of graphene are important topics. Using ultrafast optical pu

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Tseng, Kuo-Seng, and 曾國陞. "Ultrafast Dynamics of Bi2Se3 thin films studied by femtosecond pump-probe spectroscopy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/15714266051888588662.

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碩士<br>國立交通大學<br>電子物理系所<br>100<br>In this thesis, we have prepared bismuth selenide thin films which were grown on Sapphire(0001) substrates by pulsed laser deposition(PLD) and change various substrate temperature to get optimization. The surface morphology of samples with various substrate temperature was studied by means of Scanning Electron Microscopy (SEM).The crystal structure and carrier concentration were investigated by means of X-Ray Diffraction (XRD) and Hall measurement.The ultrafast carrier dynamics behavior have been studied by Optical Pump-Probe measureme

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Huang, Yung-Hung, and 黃永鴻. "Ultrafast Pump-probe Transient Absorption Spectroscopy of Layer-controllable Molybdenum Disulfide Films." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/qe5ha2.

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碩士<br>國立東華大學<br>材料科學與工程學系<br>107<br>In this thesis, we focus on the ultrafast dynamics of layer-controllable molybdenum disulfide films by using the pump-probe transient absorption technique. In addition, we compare the different fabrication process of molybdenum disulfide films. We verify the optical selection rule in molybdenum disulfide films by change the polarization properties of pump. In the first chapter, we introduce the recently research in two-dimensional material and include the molybdenum disulfide, which is in the family of the two-dimensional transition metal dichalcogenides. Ne

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Li, Jia-Xing, and 李嘉興. "Ultrafast Dynamics of Novel Photovoltaic Materials Studied by Femtosecond Pump Probe Spectroscopy." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7ae68h.

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博士<br>國立交通大學<br>電子物理系所<br>107<br>In recent years, metal halide semiconductor materials with a perovskite crystal structure have attracted the attention of scientists around the world, and this material has achieved extraordinary performance in photoelectric conversion. The academic circles have found that perovskite semiconductors have few defects and long carrier diffusion distances. These characteristics make the perovskite semiconductors have good luminous efficiency and can be applied to solar cells, light-emitting diodes, and lasers. In the photovoltaic element based on organic-inorganic

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Tseng, Pei-Shan, and 曾珮珊. "Study of ultrafast dynamics in graphene by optical pump mid-infrared probe spectroscopy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/17436663694962074193.

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碩士<br>國立交通大學<br>電子物理系所<br>100<br>Using ultrafast optical pump mid-infrared probe spectroscopy (OPMP), we study the relaxation dynamics of photoexcited carriers in monolayer and multilayer graphene. The substrate-induced charge density profile in graphene is determined through the spectra of transient reflectivity changes which are well described by carrier occupation probability near Fermi energy with tuning the probe photon energy. We succeeded in getting the Fermi energy of graphene films grown by chemical vapor deposition (CVD) on sapphire substrates. For photon energies about twice the val

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Lin, Chao-Ting, and 林照庭. "Ultrafast carrier dynamics of P3HT:PCBM solar cells studied by ultrabroadband pump-probe spectroscopy." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/10384096496569082346.

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碩士<br>國立交通大學<br>電子物理系所<br>101<br>In this thesis, a homemade NOPA (non-collinear optical parametric amplifier) system was used to study the ultrafast dynamics of solar cell of poly(3-hexylthiophene) (P3HT):[6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The sub-10 fs laser pulses with a broad spectrum in visible range are frequently used to study the ultrafast dynamics of photochemical reaction and transient molecular structure changes. Recently, P3HT:PCBM solar cell attracted a great deal of attention due to the low toxicity, low price, simple fabrication processes, adjustable electronic ba

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Magalhães, Tiago Emanuel da Cunha. "Femtosecond Pump-Probe Spectroscopy for Studies of the Ultrafast Carrier Dynamics in Graphene." Master's thesis, 2014. https://repositorio-aberto.up.pt/handle/10216/78209.

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張文誠. "Ultrafast carrier dynamics of PCPDTBT:PCBM solar cells studied by ultrabroadband pump-probe spectroscopy." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/3n63tj.

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碩士<br>國立交通大學<br>電子物理系所<br>106<br>Poly[2,6-(4,4-bis-(2-ethylhexyl)-4h-cyclopenta[2,1-b;3.4-b'] ditho–phene)-alt-4,7-(2,1,3-benzo-thiadiazole)] (PCPDTBT):[6,6]-phenyl-C61- butyric acid methyl ester (PCBM) solar cells have been attracting great attention due to its low price in production, efficient absorption of visible light, adjustable power conversion efficiency (PCE) by additives. However, formation and morphology of PCPDTBT:PCBM thin films seriously affect the PCE. Recently, Prof. Vohra of University of Electro-Communications (UEC) produced PCPDTBT:PCBM blend nanoparticles by miniemulsion

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Magalhães, Tiago Emanuel da Cunha. "Femtosecond Pump-Probe Spectroscopy for Studies of the Ultrafast Carrier Dynamics in Graphene." Dissertação, 2014. https://repositorio-aberto.up.pt/handle/10216/78209.

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Kanal, Florian. "Femtosecond Transient Absorption Spectroscopy – Technical Improvements and Applications to Ultrafast Molecular Phenomena." Doctoral thesis, 2015. https://nbn-resolving.org/urn:nbn:de:bvb:20-opus-118771.

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Photoinduced processes are nowadays studied with a huge variety of spectroscopic methods. In the liquid phase, transient absorption spectroscopy is probably the most versatile pump–probe technique used to study light-induced molecular phenomena. Optical time-resolved spectroscopy is established in a large number of laboratories and is still further being developed with respect to many technical aspects. Nevertheless, the full potential of shortening the data-acquisition time—necessary for the investigation of rapidly photodegrading samples and observation of macroscopically fast processes—achi

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