Thematische Bibliographien / Pump-Probe imaging

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Auswahl der wissenschaftlichen Literatur zum Thema „Pump-Probe imaging“

Autor: Grafiati

Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Pump-Probe imaging"

Furukawa, Naoki, Chad E. Mair, Valeria D. Kleiman und Jun Takeda. „Femtosecond real-time pump–probe imaging spectroscopy“. Applied Physics Letters 85, Nr. 20 (15.11.2004): 4645–47. http://dx.doi.org/10.1063/1.1823039.

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Massaro, Eric S., Andrew H. Hill, Casey L. Kennedy und Erik M. Grumstrup. „Imaging theory of structured pump-probe microscopy“. Optics Express 24, Nr. 18 (31.08.2016): 20868. http://dx.doi.org/10.1364/oe.24.020868.

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Simpson, Mary Jane, Keely E. Glass, Jesse W. Wilson, Philip R. Wilby, John D. Simon und Warren S. Warren. „Pump–Probe Microscopic Imaging of Jurassic-Aged Eumelanin“. Journal of Physical Chemistry Letters 4, Nr. 11 (23.05.2013): 1924–27. http://dx.doi.org/10.1021/jz4008036.

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Linne, M. A., J. R. Gord, D. C. Morse, J. L. Skilowitz und G. J. Fiechtner. „Two-dimensional pump–probe imaging in reacting flows“. Optics Letters 20, Nr. 23 (01.12.1995): 2414. http://dx.doi.org/10.1364/ol.20.002414.

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Geiser, Joseph D., und Peter M. Weber. „Pump–probe diffraction imaging of vibrational wave functions“. Journal of Chemical Physics 108, Nr. 19 (15.05.1998): 8004–11. http://dx.doi.org/10.1063/1.476239.

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Märk, Julia, Franz-Josef Schmitt, Christoph Theiss, Hakan Dortay, Thomas Friedrich und Jan Laufer. „Photoacoustic imaging of fluorophores using pump-probe excitation“. Biomedical Optics Express 6, Nr. 7 (15.06.2015): 2522. http://dx.doi.org/10.1364/boe.6.002522.

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Matthews, T. E., I. R. Piletic, M. A. Selim, M. J. Simpson und W. S. Warren. „Pump-Probe Imaging Differentiates Melanoma from Melanocytic Nevi“. Science Translational Medicine 3, Nr. 71 (23.02.2011): 71ra15. http://dx.doi.org/10.1126/scitranslmed.3001604.

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Dong, C. Y., P. T. So, T. French und E. Gratton. „Fluorescence lifetime imaging by asynchronous pump-probe microscopy“. Biophysical Journal 69, Nr. 6 (Dezember 1995): 2234–42. http://dx.doi.org/10.1016/s0006-3495(95)80148-7.

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Wei, Lu, und Wei Min. „Pump-probe optical microscopy for imaging nonfluorescent chromophores“. Analytical and Bioanalytical Chemistry 403, Nr. 8 (13.03.2012): 2197–202. http://dx.doi.org/10.1007/s00216-012-5890-1.

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Barmaki, Samira, Karima Guessaf und Stéphane Laulan. „Imaging of ultrafast electron motion in molecules“. Canadian Journal of Physics 89, Nr. 6 (Juni 2011): 703–7. http://dx.doi.org/10.1139/p11-039.

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We probe the attosecond electron motion in [Formula: see text], at short internuclear distances, by exact numerical solution of the 3D time-dependent Schrödinger equation in the Born–Oppenheimer approximation. We simulate a pump-probe experiment to calculate the energy distributions of ionized electrons. We start the experiment with a pump pulse that creates a coherent electronic wavepacket combination of the 1sσg and 2pσu states. We let the electronic wavepacket oscillate during a time delay Δt. In the second step of the experiment, we submit the wavepacket to an intense attosecond X-ray laser pulse. We observe an asymmetry in the energy distributions of ionized electrons that allows the mapping of the attosecond electron motion in [Formula: see text].

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Dissertationen zum Thema "Pump-Probe imaging"

Lozan, Olga. „Surface plasmons and hot electrons imaging with femtosecond pump-probe thermoreflectance“. Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0021/document.

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Ce travail est consacré à l’étude de la dynamique ultrarapide d’électrons chauds photo-excité dans des structures plasmonique. L’intérêt particulier de ce domaine réside dans le fait que les SPs, en raison de leurs caractéristiques spatio-temporelles spécifique, offrent un nouvel attrait technologique pour les processus de transport d’information ultra-rapide aux nano-échelles. Dans ce contexte, ce manuscrit offre une compréhension et une exploitation de l’une des principales limitations des technologies à base de SP : les pertes par effet Joule. Nous exploitons le fait que le mécanisme d’absorption des plasmons dans les métaux est suivi par la génération d’électrons chauds à l’échelle femtoseconde, ainsi les pertes peuvent être considrées comme une conversion d’énergie plasmon-électrons chauds. Cette conversion d’énergie est mesurée à l’aide d’une technique pompe-sonde laser femtoseconde. Nous lançons des impulsions SP que nous sondons sur des centaines de femtosecondes grace aux variations de permittivité diélectrique induites par le gaz d’électrons chaud accompagnant la propagation de SP. Le profil de température électronique est par conséquent une image de la distribution de densité de puissance de plasmon (absorption) non élargi spatialement et temporellement par diffusion de porteurs d’énergie. Nous avons pu démontrer la capacité de relier la mesure de température électronique à l’absorption du SP, révélant une absorption anormale autour d’une fente nanométrique. Les résultats expérimentaux sont en accord quantitatif avec les prédictions théoriques de la distribution de densité de puissance. Dans une seconde partie, nous avons étudié les pertes plasmoniques et leurs caractéristiques lors de sa propagation sur un film métallique semi-infini. Nous avons déterminé la vitesse de l’onde thermique électronique et son atténuation. Dans la dernière partie, nous utilisons une structure en pointe pour guider adiabatiquement et focaliser le plasmon à l’extrémité. Nous avons démontré ainsi la génération d’un point chaud nanométrique et avons mis en évidence un retard dans l’échauffement des électrons à l’extrémité de la pointe. Les perspectives et les questions ouvertes sont également discutées
In this work we explored the ultrafast dynamics of photo-excited hot electrons in plasmonic structures. The particular interest of this field resides on the fact surface plasmons (SP), because of their unrivaled temporal and spatial characteristics, provide a technological route for ultrafast information processes at the nanoscale. In this context, this manuscript provides a comprehension and the harnessing of one of the major limitation of the SP-based technologies : absorption losses by Joule heating. We exploit the fact that the mechanism of plasmon absorption in metals is followed by generation of hot electrons at femtosecond time scale, thus losses can be seen as a plasmon-to-hot-electron energy conversion. This energy conversion is measured with femtosecond pump-probe technique. Femtosecond SP pulses are launched and probed over hundred femtoseconds through the permittivity variations induced by the hot-electron gas and which accompany the SP propagation. The measured electron temperature profile is therefore an image of plasmon power density distribution (absorption) not broadened spatially and temporally by energy carrier diffusion. As an important result we demonstrated the capability to link the electronic temperature measurement to the plasmonic absorption, revealing an anomalous light absorption for a sub- slit surroundings, in quantitative agreement with predictions of the power density distribution. In a second part we studied plasmon losses and their characteristics when they propagate on semi-infinite metal film. We determined the electronic thermal wave velocity and damping. In the last part we used a focusing taper-structure to adiabatically guide and focus the plasmon at the apex. Was demonstrated the generation of a nanoscale hot spot and put in evidence a delayed electron heating at the taper apex. Perspectives and the remaining open questions are also discussed

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Kim, Yang-Hyo. „Wide-field structured illumination microscopy for fluorescence and pump-probe imaging“. Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/121846.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2019
Cataloged from PDF version of thesis.
Includes bibliographical references.
The optical resolution of microscopy is limited by the wave-like characteristic of the light. There are many recent advances in overcoming this diffraction limited resolution, but mostly focused on fluorescent imaging. Furthermore, there are few non-fluorescence wide-field super-resolution techniques that can fully utilize the applicable laser power to optimize imaging speed. Structured illumination microscopy is a super-resolution method that relies on patterned excitation. This thesis has presented novel applications of structured illumination microscopy to surface plasmon resonance fluorescence and pump-probe scattering imaging. First, structured illumination microscopy was introduced to surface plasmon resonance fluorescence imaging for high signal-to-noise and high resolution. Secondly, a theoretical framework for three-dimensional wide-field pump-probe structured illumination microscopy has been developed to increase the lateral resolution and enable depth sectioning. Further, structured illumination wide-field photothermal digital phase microscopy is proposed as a high throughput, high sensitivity super-resolution imaging tool to diagnose ovarian cancer. Finally, I have derived the exact analytical solution to the heat conduction problem in which a sphere absorbs temporally modulated laser beam for photothermal microscopy. The proposed method also has a great potential to be applied to other pump-probe modalities such as transient absorption and stimulated Raman scattering.
Funding sources and sponsors: National Institutes of Health (9P41EB015871-26A1, 5R01NS051320, 4R44EB012415, and 1R01HL121386-OlAl), National Science Foundation (CBET-09395 11), Hamamatsu Corporation, Singapore-Massachusetts Institute of Technology Alliance for Research and Technology (SMART) Center, BioSystems and Micromechanics (BioSyM), and Samsung Scholarship
by Yang-Hyo Kim.
Ph. D.
Ph.D. Massachusetts Institute of Technology, Department of Mechanical Engineering

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Clements, Ethan Robert. „CHARACTERIZATION OF OPTICAL LATTICES USING PUMP-PROBESPECTROSCOPY AND FLUORESCENCE IMAGING“. Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1470323164.

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Hassan, Mostafa. „Ultrafast imaging of Bessel beam generated nano-plasmas within dielectrics“. Electronic Thesis or Diss., Bourgogne Franche-Comté, 2022. http://indexation.univ-fcomte.fr/nuxeo/site/esupversions/9cc27edd-c3bb-4525-a1f5-e5e8f55c54c1.

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Les lasers femtoseconde ultra-intense sont largement utilisés pour le traitement des matériaux à l'échelle micro et nanométrique. Dans ce contexte, il est nécessaire de contrôler l'interaction laser-matière. Les faisceaux non diffractants, tels que les faisceaux de Bessel, offrent des avantages substantiels en ce qui concerne la stabilité de la propagation non linéaire dans les diélectriques. Ils ont permis la génération de nano-vides de rapport d'aspect extrêmement élevé. Cependant, les modèles conventionnels décrivant l'interaction Bessel-diélectrique ne parviennent pas à expliquer les observations expérimentales. Par conséquent, cette thèse vise à développer un ensemble de techniques pour retrouver les paramètres des plasmas générés par laser. La première partie développe une approche pour façonner la polarisation du faisceau de Bessel le long de sa propagation grâce à des lames demi-onde variant dans l'espace. La deuxième partie de ce travail est dédiée à l'imagerie de l'interaction entre le plasma généré par le début de l'impulsion et la majeure partie de l'impulsion. Nous avons confirmé une génération de nano-plasma avec une densité dépassant la densité critique, et un diamètre de typiquement 200 nm. La troisième partie de ce travail se concentre sur l'imagerie du plasma en utilisant une approche pompe-sonde. Ce nouveau concept est basé sur la mise en forme de la sonde comme un faisceau de Bessel d'ordre supérieur. Les paramètres du plasma sont extraits d'un ensemble de mesures de réflectivité en amplitude et en phase pour différents ordres et angles de l'impulsion de la sonde
Ultra-intense femtosecond lasers are widely used for nano and micro-material processing. Explaining the laser-matter interaction is needed to control the processing. In this context, non-diffracting beams, such as Bessel beams, provided substantial advantages regarding the stability of the non-linear propagation within dielectrics. They allowed the generation of extremely high aspect ratio nanovoids. However, conventional models describing Bessel-dielectric interaction fail to explain experimental observations. Therefore, this thesis aims to develop a set of techniques to retrieve the parameters of laser-generated plasmas. The first part develops an approach to shape the polarization of the Bessel beam along its propagation based on spatially-varying waveplates. The second part of this work is dedicated to the imaging of the interaction between the plasma generated by the onset of the pulse and the trailing part inside sapphire. We confirmed a generation of nano-plasma with a density exceeding the critical density, and a diameter of typically 200 nm. Then, the third part of this work focuses on imaging the plasma using a pump-probe approach. This new concept is based on shaping the probe as a higher-order Bessel beam. The plasma parameters are extracted from a set of measurements of reflectivity in amplitude and phase for different orders and angles of the probe pulse

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Abbas, Allaoua. „Développement d'un dispositif pompe-sonde hétérodyne : application à l'imagerie en acoustique picoseconde“. Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00988758.

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L' acoustique picoseconde permet l'étude de structures aux dimensions sub-microniques grâce à l'utilisation d'ultrasons dont le contenu spectral peut s' étendre au-delà du THz. La génération et la détection de ces ondes sont rendues possibles par l'association de lasers impulsionnels femtosecondes à dispositifs de type pompe-sonde. Ce manuscrit de thèse décrit la mise en place d'une expérience d' imagerie opto-acoustique avec une résolution spatiale submicronique. L' utilisation combinée d'un échantillonnage optique hétérodyne et de cavités lasers à bas taux de répétition (50 MHz) permet de gagner plusieurs ordres de grandeur sur les temps d'acquisition et de disposer d'une très bonne résolution spectrale. Le manuscrit s'articule autour de trois parties. Dans un premier temps les deux cavités laser aux taux de répértition légèrement différents permettant l'échantillonnage otpique hétérdodyne sont présentées. Puis l'architecture et les performances du système d'asservissement de leur taux de répétion sont décrites. Dans la seconde partie du manuscrit, l'implémentation de cette double cavité dans une expérience pompre-sonde est détaillée et la possibilité de détecter des ondes acoustiques sub-THz avec une résolution de 50 MHz est démontrée. Enfin, dans le dernier chapitre, la puissance de cette expérience pour réaliser de l'imagerie ultra-rapide est illustrée au travers de deux exemples : l'étude d'ondes acoustiques de surface GHz dont la dispersion est induite par la présence d'une couche nanométrique et la détection d'hétérogénéités élastiques submicroniques

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Handschin, Charles. „Spectroscopie EUV résolue temporellement à l'échelle femtoseconde par imagerie de vecteur vitesse et génération d'harmoniques d'ordres élevés“. Phd thesis, Université Sciences et Technologies - Bordeaux I, 2013. http://tel.archives-ouvertes.fr/tel-00944627.

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Cette thèse fait l'étude expérimentale de dynamiques de relaxations ultrarapides au sein d'atomes et de molécules (Ar, NO2, C2H2). Les méthodes expérimentales qui sont utilisées sont basées sur l'interaction d'un rayonnement laser avec le système atomique ou moléculaire étudié et font intervenir le processus de génération d'harmoniques d'ordres élevés, ainsi que la spectrométrie d'imagerie de vecteur vitesse. Au cours de cette thèse, deux approchesexpérimentales de type pompe-sonde ont été mises en œuvre. Une première approche exploitela sensibilité du processus de génération d'harmoniques à la structure électronique dumilieu pour la sonder. Cette méthode a été utilisée sur la molécule de dioxyde d'azote pourobserver sa relaxation électronique à travers l'intersection conique des états X2A1-A2B2suite à une excitation autour de 400 nm. Une seconde approche utilise le rayonnementharmonique comme source de photons dans le domaine de l'extrême ultraviolet (EUV)pour exciter ou sonder les espèces d'intérêt. Cette approche a été couplée avec l'utilisationd'un spectromètre d'imagerie de vecteur vitesse (VMIS), qui a été développé durant lathèse. Des expériences menées sur un système modèle comme l'argon ont permis de validerle dispositif expérimental, qui a ensuite été mis en application pour étudier la photodissociationde la molécule d'acétylène, après excitation autour de 9,3 eV du complexe deRydberg 3d-4s. Les deux méthodes mises en œuvre permettent toutes-deux de réaliserdes études dynamiques résolues en temps à l'échelle femtoseconde.

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Matthews, Thomas. „Pump-Probe Molecular Imaging“. Diss., 2011. http://hdl.handle.net/10161/5685.

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In this dissertation, we develop pump probe spectroscopy as a method to differentiate different chemical varieties of melanin, a common biopigment, and exploit these differences to improve the accuracy of melanoma diagnosis. This method gives insight into the chemical makeup and secondary structure of melanins. Pump probe spectroscopy is implemented in a scanning laser microscope as a form of multiphoton imaging, where it is used to image biopsies of human pigmented cutaneous lesions. Melanoma diagnosis is clinically challenging: the accuracy of visual inspection by dermatologists is highly variable and heavily weighted toward false positives. Even the current gold standard of biopsy results in varying diagnoses among pathologists. Using pump probe imaging, significant chemical and morphological changes were found between melanoma and melanocytic nevi, including increased eumelanin content, chemical heterogeneity and general pigmentation. Signal processing methods revealed further differences between melanoma and melanocytic nevi on the cellular scale. Pump probe imaging directly in H&E stained biopsy samples allows integration of this technique with existing histopathology protocols. High resolution imaging found chemical heterogeneity of melanin within pigmented cells. We show that oxyhemoglobin and deoxyhemoglobin may also be differentiated by pump probe imaging. Epi mode imaging of eumelanin, pheomelanin and microvasculature is demonstrated in vivo in human xenograft mouse models of melanoma.

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Jacob, Desmond. „Design and Optimize a Two Color Fourier Domain Pump Probe Optical Coherence Tomography System“. 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-796.

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Molecular imaging using fluorescence spectroscopy-based techniques is generally inefficient due to the low quantum yield of most naturally occurring biomolecules. Current fluorescence imaging techniques tag these biomolecules chemically or through genetic manipulation, increasing the complexity of the system. A technique capable of imaging these biomolecules without modifying the chromophore and/or its environment could provide vital biometric parameters and unique insights into various biological processes at a molecular level. Pump probe spectroscopy has been used extensively to study the molecular properties of poorly fluorescing biomolecules, because it utilizes the known absorption spectrum of these chromophores. Optical Coherence Tomography (OCT) is an optical imaging modality that harnesses the power of low coherence interferometry to measure the 3-D spatially resolved reflectivity of a tissue sample. We plan to develop a new molecular imaging modality that combines these techniques to provide 3-D, highresolution molecular images of various important biomolecules. The system uses a Fourier domain OCT setup with a modified sample arm that combines the "pump" and "probe" beams. The pump beam drives the molecules from the ground state to excited state and the probe interrogates the population change due to the pump and is detected interferometrically. The pump and the probe beam wavelengths are optimized to maximize absorption at the pump wavelength and maximize the penetration depth at the probe wavelength. The pump-probe delay can be varied to measure the rate at which the excited state repopulates the ground state, i.e., the ground state recovery time. The ground state recovery time varies for different chromophores and can potentially be used to identify different biomolecules. The system was designed and optimized to increase the SNR of the PPOCT signals. It was tested by imaging hemoglobin and melanin samples and yielded encouraging results. Potential applications of imaging hemoglobin using this technique include the mapping of tissue microvasculature and measuring blood-oxygen saturation levels. These applications could be used to identify hypoxic areas in tissue. Melanin imaging can provide means of demarcation of melanoma in various organs such as skin, eye and intestines.

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Wan, Qiujie. „Development of Molecular Contrast in Coherence Domain Optical Imaging“. Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10554.

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Optical imaging has been developed quickly in the past decades because it has become an important research tool in biology, biochemistry, and biomedical sciences. Coherence domain optical imaging is one of the well developed optical imaging modalities, as it provides high resolution and long penetration depth. In this dissertation, we will report our work on development of molecular contrast in coherence domain optical imaging. In order to image important molecules which are poor fluorophores, we developed a high resolution molecular imaging technique, pump-probe optical coherence microscopy (PPOCM), which does not rely on fluorescent tags. PPOCM is the fusion of Pump-Probe spectroscopy and optical coherence microscopy (OCM). We have demonstrated the prototype system on a fixed human skin sample containing a nodular melanoma. The results indicate that PPOCM can clearly provide strong contrast between the melanotic and amelanotic regions. This technique can be applied to early diagnosis of melanoma and the mapping of tumor margins during excision. It also can be extended to any biological chromophore with a known absorption spectrum and sufficient concentration. In order to differentiate further multiple chromophores, we developed a spectrally resolved two color pump-probe Optical Coherence Microscopy (SRPPOCM). We showed the prototype system on a red hair and a black hair. Our preliminary results show that the SRPPOCM technique could provide a contrast between pheomelanin and eumelanin. This technique could be used potentially as a clinical tool for diagnosing different progression stages of melanoma. This technique could also be applied to differentiate other mixed chromophores. Second harmonic optical coherence tomography (SHOCT) is non-linear high resolution optical molecular imaging modality which is widely used in non-centrosymmetric material. However, depth ambiguity is associated with SHOCT in tissue sample because forward generated second harmonic signal does not correctly report where the second harmonic signal is generated. We studied the feasibility of collecting the backward generated second harmonic signal from nanocrystals through a Second Harmonic Optical Coherence Tomography in Fourier domain. The preliminary result shows that we can collect backward generated second harmonic signal from nanocrystals which indicates that this technique could suppress the depth ambiguity.

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Dong, Puting. „Single-cell pump probe imaging of intrinsic chromophores identifies diagnostic marker and therapeutic target of diseases“. Thesis, 2020. https://hdl.handle.net/2144/41526.

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When photons transport inside the biological samples, the interaction between photons and biological analytes enable us to map a specific diagnostic biomarker for disease. However, biological media are composed of discrete scattering particles. Propagation of photons are highly attenuated due to scattering and absorption, which makes it challenging for clinical diagnosis. There is a need for identifying biomarkers for precision medicine and diagnosis. Chromophores exists endogenously in various organisms and cells; however, their potential of precision diagnosis and treatment still remain under-explored. Note that lots of research has been harnessed, for example, autofluorescence from FAD and NADH has been used for cancer diagnosis, but the potential of this area needs to be further mined, as most of the intrinsic chromophores has considerably low fluorescent quantum yield. This thesis illustrates how we came with an absorption-based chemical microscopy approach to study these chromophores at single cell level, and that these opens new discoveries for diagnosis and treatment. It first outlines how transient absorption microscopy is utilized to diagnose diabetes at single cell level, and then this technique enabled the discovery of a molecular signature, staphyloxanthin photolysis, for efficacious treatment of methicillin-resistant Staphylococcus aureus (MRSA)-caused infections through photo-disassembling its cell membrane microdomains. Besides staphyloxanthin, we also uncovered that catalase, which exists in most of the microbes (Candida auris, and drug-resistant gram-negative pathogens included), can be efficiently photo-inactivated, thus enabling these catalase-positive pathogens to be sensitive to exogenous antimicrobial agents. We also utilized stimulated Raman scattering microscopy to map the orientation amphotericin B, a golden standard antifungal agent, in a single fungal cell membrane to reveal its working mechanism. Collectively, nonlinear chemical imaging offers a profound tool to visualize in situ microbial metabolic dynamics, and discover molecular markers for precision treatment and diagnostic purposes.
2022-10-09T00:00:00Z

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Buchteile zum Thema "Pump-Probe imaging"

Johnston, Michael B., und James Lloyd-Hughes. „Pump-Probe Spectroscopy at Terahertz Frequencies“. In Terahertz Spectroscopy and Imaging, 251–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29564-5_10.

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Adachi, Shunsuke, Motoki Sato, Yoshi-ichi Suzuki und Toshinori Suzuki. „Pump-Probe Photoelectron Imaging with 90-nm Excitation Pulses“. In Springer Proceedings in Physics, 164–67. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13242-6_39.

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Dong, Chen-Yuan, Christof Buehler, Peter T. C. So, Todd French und Enrico Gratton. „Biological Applications of Time-Resolved, Pump-Probe Fluorescence Microscopy and Spectroscopy in the Frequency Domain“. In Methods in Cellular Imaging, 324–40. New York, NY: Springer New York, 2001. http://dx.doi.org/10.1007/978-1-4614-7513-2_19.

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Kunitski, Maksim. „Small Helium Clusters Studied by Coulomb Explosion Imaging“. In Topics in Applied Physics, 41–66. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94896-2_2.

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AbstractSmall helium clusters consisting of two and three helium atoms are unique quantum systems in several aspects. The helium dimer has a single weakly bound state and is of huge spatial extent, such that most of its probability distribution resides outside the potential well in the classically forbidden tunnelling region. The helium trimer possesses only two vibrational states, one of which is of Efimov nature. In this chapter, we discuss application of the Coulomb explosion imaging technique for studying geometries and binding energies of these peculiar two- and three-body quantum systems. Irradiation of a helium cluster by a strong laser field allows tuning interactions between helium atoms. Such ultrashort interaction modification induces response dynamics in a cluster that is observed by combination of the imaging technique with the pump-probe approach.

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Furukawa, Naoki, Chad E. Mair, Valeria D. Kleiman und Jun Takeda. „Direct visualization of transient absorption by real-time pump-probe imaging spectroscopy“. In Springer Series in Chemical Physics, 133–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27213-5_43.

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Suzuki, Toshinori, und Benjamin J. Whitaker. „Photoelectron and photoion imaging with femtosecond pump-probe time clocking“. In Imaging in Molecular Dynamics, 165–86. Cambridge University Press, 2003. http://dx.doi.org/10.1017/cbo9780511535437.008.

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Rothhardt, J., und L. Loetgering. „Ultrafast Nanoscale Imaging with High Harmonic Sources“. In Structural Dynamics with X-ray and Electron Scattering, 233–53. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781837671564-00233.

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The principle of high harmonic generation (HHG) is the basis of a new era of compact, high-flux radiation sources, which deliver short wavelengths at ultrafast timescales. Various metrology techniques reported so far, such as pump–probe spectroscopy and microscopy, are either time-, frequency-, or space-resolved, but relatively few combined approaches exist. Recent advances in both source and algorithm development have enabled multimodal acquisition and data analysis schemes that bridge the gap between these separate domains. Here, we describe emerging techniques in ultrafast lensless imaging, which have gained traction in the HHG community. In particular, this chapter includes a discussion on coherent diffraction imaging (CDI), Fourier transform holography (FTH), and ptychography. Emphasis is given to extending the abovementioned diffractive imaging techniques to broadband experimental conditions – a necessary requirement for imaging at attosecond timescales.

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Pfau, B., und S. Eisebitt. „X-ray Resonant Scattering and Holography with Application to Magnetization Dynamics“. In Structural Dynamics with X-ray and Electron Scattering, 254–300. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781837671564-00254.

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We introduce resonant magnetic scattering using extreme ultraviolet radiation and soft X-rays. We discuss time-resolved studies of lateral magnetization dynamics in thin film systems with nanometre spatial resolution on ultrafast timescales based on classical ensemble-averaged reciprocal-space information provided by incoherent scattering. Moreover, we provide a formalism to expand the resonant atomic scattering factor into the corresponding charge and magnetic scattering amplitude components. We also examine the opportunities offered by interference-based approaches, which have only recently become available due to the development of short-pulse soft-X-ray sources with large coherent photon flux. Correlation analysis of speckle patterns and X-ray holography are discussed, with the latter currently being the only commonly used approach for sub-50 nm resolution magnetization imaging at free-electron X-ray lasers and high harmonic generation sources. We discuss pioneering work and examples of scattering-based experiments on magnetization dynamics, focusing predominantly on laser-induced lateral dynamics in thin films and multilayers on the femtosecond to nanosecond timescale. In addition to approaches providing temporal resolution via pump–probe experiments, we provide details on real-time imaging of magnetization dynamics in thermal equilibrium based on a combination of coherent X-ray scattering and holography.

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Konferenzberichte zum Thema "Pump-Probe imaging"

Bigot, Jean-Yves, Abdelghani Laraoui, Mircea Vomir und Michele Albrecht. „Magneto optical pump probe imaging“. In 2008 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2008. http://dx.doi.org/10.1109/cleo.2008.4551482.

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Stoker, David, Michael Bruce, Eric Lavelle, Erik Matlin, James Potthast, Christopher Sakai und Neil Troy. „Pump-Probe Imaging of Integrated Circuits“. In ISTFA 2013. ASM International, 2013. http://dx.doi.org/10.31399/asm.cp.istfa2013p0168.

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Abstract We present a new method of imaging integrated circuits (ICs) using a dual-laser scanning confocal microscope. In this method we introduce physical and/or functional changes to the integrated circuit using the first ‘pump’ laser and then image the response of the circuit using the second ‘probe’ laser. We propose several novel applications of this imaging method. Specifically, we show how to image the flow of injected charge carriers and use the derived images to improve the resolution of material interfaces. We also show how to image changes to activity and laser voltage-probed waveforms and use the information to discover electrical connections between logic cells.

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Cao, Fei, Zhihai Qiu, Rui Zhang, Puxiang Lai und Lei Sun. „Nonlinear Photoacoustic Imaging by Pump-Probe Excitation“. In International Conference on Photonics and Imaging in Biology and Medicine. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/pibm.2017.w3a.79.

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Cao, Fei, Puxiang Lai, Lei Sun, Zhihai Qiu und Kinfung Wong. „Nonlinear photoacoustic generation by pump-probe excitation“. In Photons Plus Ultrasound: Imaging and Sensing 2019, herausgegeben von Alexander A. Oraevsky und Lihong V. Wang. SPIE, 2019. http://dx.doi.org/10.1117/12.2507342.

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Ferrari, Raffaele, Cosimo D'Andrea, Andrea Bassi, Gianluca Valentini und Rinaldo Cubeddu. „Time-gated real-time pump-probe imaging spectroscopy“. In European Conference on Biomedical Optics. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/ecbo.2007.6631_46.

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ROETERDINK, W. G., und M. H. M. JANSSEN. „FEMTOSECOND PUMP-PROBE PHOTO-ION VELOCITY MAP IMAGING“. In With Foreword by Prof A H Zewail, Nobel Laureate in Chemistry, 1999. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777980_0057.

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Ferrari, Raffaele, Cosimo D'Andrea, Andrea Bassi, Gianluca Valentini und Rinaldo Cubeddu. „Time-gated real-time pump-probe imaging spectroscopy“. In European Conference on Biomedical Optics, herausgegeben von Christian D. Depeursinge. SPIE, 2007. http://dx.doi.org/10.1117/12.728074.

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Settersten, T., C. Fisher, N. Middleton, M. Linne, J. Gord, P. Paul, G. Fiechtner et al. „Demodulating camera system for picosecond Pump/Probe imaging“. In 35th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-158.

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„Photon-counting detectors for pump-probe science“. In 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC). IEEE, 2013. http://dx.doi.org/10.1109/nssmic.2013.6829693.

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Zhang, William, und Jun Jiang. „Proposal of Multicolor Polarization Resolved Pump-Probe Microscopy“. In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.jw4b.47.

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We proposed a new pump-probe microscope with improved imaging throughput and imaging sensitivity compared to existing pump-probe microscopes. It will significantly broaden the spectrum of molecular imaging in fundamental cell biology, disease diagnosis, and nanomaterials.

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