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124 results on '"Schoenlein, R.W."'

1. Phase Transition in strongly-correlated VO2: Time-domain Assignment of Cause and Effect

Author

Cavalleri, A., Dekorsy, Th., Chong, H.H., Kieffer, J.C., and Schoenlein, R.W.

Subjects
Materials science, Condensed matter physics, superconductivity and superfluidity, correlated electron system vandium femtosecond spectroscopy
Abstract

We establish time-domain hierarchy between structural and electronic effects in the strongly correlated system VO2. The insulator-to-metal transition is driven directly by structural change rather than by electron-electron correlations.

Published
2004

2. Femtosecond Near Edge X-ray Absorption Measurement of the VO2 Phase Transition

Author

Cavalleri, A., Chong, H.H.W., Fourmaux, S., Glover, T.E., Heimann, P.A, Kieffer, J.C., Padmore, H.A., and Schoenlein, R.W.

Subjects
Materials science, Condensed matter physics, superconductivity and superfluidity, femtosecond x-ray correlated electron system vanadium ultrafast spectroscopy
Published
2004

5. Generation of femtosecond synchrotron pulses: Performance and characterization

Author

Schoenlein, R.W., Cavalleri, A., Chong, H.H.W., Glover, T.E., Heimann, P.A., Zholents, A.A., and Zolotorev, M.S.

Subjects
Particle accelerators, Materials science, femtosecond x-ray synchrotron time-resolved ultrafast
Abstract

Femtosecond synchrotron pulses of 13 MeV relative to the nominal 1.9 GeV beam energy. Femtosecond pulses are effectively isolated from the long-pulse background using the transverse dispersion of the storage ring in combination with an x-ray imaging optic and a pair of slits to achieve a signal/background ratio of ~;1.

Published
2003

8. Ultrafast x-ray science at the Advanced Light Source

Author

Schoenlein, R.W., Chin, A.H., Chong, H.H.W., Falcone, R.W., Glover, T.E., Heimann, P.A., Johnson, S.L., Lindenberg, A.M., Shank, C.V., Zholents, A.A., and Zolotorev, M.S.

Subjects
Instrumentation -- other, Materials science, Particle accelerators, femtosecond x-rays time-resolved dynamics synchrotron slice
Abstract

Our scientific understanding of the static or time-averaged structure of condensed matter on the atomic scale has been dramatically advanced by direct structural measurements using x-ray techniques and modern synchrotron sources. Of course the structure of condensed matter is not static, and to understanding the behavior of condensed matter at the most fundamental level requires structural measurements on the time scale on which atoms move. The evolution of condensed-matter structure, via the making and breaking of chemical bonds and the rearrangement of atoms, occurs on the fundamental time scale of a vibrational period, ~;100 fs. Atomic motion and structural dynamics on this time scale ultimately determine the course of phase transitions in solids, the kinetic pathways of chemical reactions, and even the efficiency and function of biological processes. The integration of x-ray measurement techniques, a high-brightness femtosecond x-ray source, femtosecond lasers, and stroboscopic pump-probe techniques will provide the unique capability to address fundamental scientific questions in solid-state physics, chemistry, AMO physics, and biology involving structural dynamics. In this paper, we review recent work in ultrafast x-ray science at the ALS including time-resolved diffraction measurements and efforts to develop dedicated beamlines for femtosecond x-ray experiments.

Published
2000

9. Femtosecond x-ray pulses from a synchrotron

Author

Schoenlein, R.W., Chong, H.H.W., Glover, T.E., Heimann, P.A., Shank, C.V., Zholents, A.A., and Zolotorev, M.S.

Subjects
Instrumentation -- other, Materials science, femtosecond x-ray synchrotron beamline structural dynamics
Abstract

An important frontier in ultrafast science is the application of femtosecond x-ray pulses to the study of structural dynamics in condensed matter. We show that femtosecond laser pulses can be used to generate high-brightness, tunable, femtosecond x-ray pulses from a synchrotron. Performance of existing and proposed femtosecond x-ray beamlines at the Advanced Light Source synchrotron are discussed.

Published
2000

13. Interaction of relativistic electrons with ultrashort laser pulses: generation of femtosecond x-rays and microprobing electron beams

Author

Leemans, W.P., Schoenlein, R.W., Volfbeyn, P., Chin, A.H., Glover, T.E., Balling, P., Zolotorev, M., Kim, K.-J., Chattopadhyay, S., and Shank, C.V.

Subjects
X-rays -- Research, Laser pulses, Ultrashort -- Research, Electron beams -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A study was conducted on terrawatt femtosecond laser pulse and relativistic electron interactions. The scattering process was considered for ultrashort x-ray pulse generation and for the assessment of the distribution of electron beam longitudinal phase space. A 300 fs duration x-ray pulse with a peak energy of 30 keV was achieved using 90-degrees Thomson scattering. Electron beam longitudinal and transverse distributions were derived from scattered x-ray beam characteristics.

Published
1997

14. The first step in vision: femtosecond isomerization of rhodopsin

Author

Schoenlein, R.W., Peteanu, L.A., Mathies, R.A., and Shank, C.V.

Subjects
Rhodopsin -- Research, Isomerization -- Research, Optics, Physiological -- Research, Science and technology, Research
Abstract

LIGHT DETECTION BY THE VISUAL system is one of nature's most important information transduction processes. It consists of a series of chemical reactions that are initiated by the absorption of [...]

Published
1991

16. Femtosecond X-ray pulses at 0.4 Angstroms generated by 90-degree Thomson scattering: a tool for probing the structural dynamics of materials

Author

Schoenlein, R.W., Leemans, W.P., Chin, A.H., Volfbeyn, P., Glover, T.E., Balling, P., Zolotorev, M., Kim, K.-J., Chattopadhyay, S., and Shank, C.V.

Subjects
X-rays -- Research, Scattering (Physics) -- Research, Structural dynamics -- Research, Science and technology, Research
Abstract

Pulses of x-rays 300 femtoseconds in duration at a wavelength of 0.4 angstroms (30,000 electron volts) have been generated by 90° Thomson scattering between infrared terawatt laser pulses and highly [...]

Published
1996

17. Ultrafast x-ray science at the Advanced Light Source

Author

Schoenlein, R.W., primary, Chin, A.H., additional, Chong, H.H.W., additional, Falcone, R.W., additional, Glover, T.E., additional, Heimann, P.A., additional, Johnson, S.L., additional, Lindenberg, A.M., additional, Shank, C.V., additional, Zholents, A.A., additional, and Zolotorev, M.S., additional

Published
2000
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18. Nanolocalization of Ultrashort Time-Reversed Pulses in Random Nanoparticle Assemblies

Author

Differt, Dominik, Garcia de Abajo, F.J., Pfeiffer, Walter, Strüber, Christian, Voronine, Dmitri, Chergui, M., Jonas, D.M., Riedle, E., Schoenlein, R.W., and Taylor, A.J.

Subjects
Materials science, Optics, Hierarchy (mathematics), Scattering, business.industry, Wave propagation, Optoelectronics, Ultrafast optics, Nanoparticle, business, Electromagnetic reverberation chamber
Abstract

Localization of time-reversed optical fields in random nano-assemblies is investigated. It is shown that a structural hierarchy of the scatterers (i.e., the presence of a far-field reverberation chamber) improves the nanolocalization of time-reversed waves.

Published
2010
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21. Femtosecond laser fabrication for the integration of optical sensors in microfluidic lab-on-chip devices

Author

Osellame, R., Martinez-Vazquez, R., Dongre, C., Dekker, R., Hoekstra, Hugo, Pollnau, Markus, Ramponi, R., Cerullo, G., Corkum, P., de Silvestri, S., Nelson, K.A., Riedle, E., and Schoenlein, R.W.

Subjects
Condensed Matter::Soft Condensed Matter, Physics::Fluid Dynamics, METIS-268962, EWI-18210, EC Grant Agreement nr.: FP6/034562, IOMS-SNS: SENSORS, Physics::Optics, Nonlinear Sciences::Pattern Formation and Solitons, Computer Science::Other, IR-72469
Abstract

Femtosecond lasers enable the fabrication of both optical waveguides and buried microfluidic channels on a glass substrate. The waveguides are used to integrate optical detection in a commercial microfluidic lab-on-chip for capillary electrophoresis.

Published
2009

22. Femtosecond spectral phase shaping for CARS spectroscopy and imaging

Author

Postma, S., van Rhijn, A.C.W., Korterik, Jeroen P., Herek, Jennifer Lynn, Offerhaus, Herman L., Corkum, P., de Silvestri, S., Nelson, K.A., Riedle, E., Schoenlein, R.W., Faculty of Science and Technology, and Optical Sciences

Subjects
Materials science, business.industry, Phase (waves), Signal, symbols.namesake, Optics, IR-72660, Microscopy, Femtosecond, symbols, Coherent anti-Stokes Raman spectroscopy, Raman spectroscopy, Spectroscopy, business, Raman scattering
Abstract

Coherent Anti-Stokes Raman Scattering (CARS) is a third-order non-linear optical process that provides label-free, chemically selective microscopy by probing the internal vibrational structure of molecules. Due to the resonant enhancement of the CARS process, faster imaging is possible compared to Raman microscopy. CARS is unaffected by background fluorescence, but the inherent non-resonant background signal can overwhelm the resonant signal. We demonstrate how simple phase shapes on the pump (and probe) beam reduce the background signal and enhance the resonant signal. We demonstrate chemically selective microscopy using these shaped pulses on plastic beads.

Published
2009

23. Ultrafast double pulse parametric amplification for precision Ramsey metrology

Author

Kandula, D.Z., Renault, A.A.L., Gohle, C., Wolf, A.L., Witte, S., Hogervorst, W., Ubachs, W.M.G., Eikema, K.S.E., Corkum, P., Silvestri, S., Nelson, K.A., Riedle, E., Schoenlein, R.W., Atoms, Molecules, Lasers, Biophysics Photosynthesis/Energy, and Earth Sciences

Subjects
Physics::Optics, Physics::Atomic Physics
Published
2009

24. 3 GHz RF streak camera for diagnosis of sub-100 fs, 100 keV electron bunches

Author

Oudheusden, van, T., Nohlmans, J.R., Roelofs, W.S.C., Root, op 't, W., Luiten, O.J., Corkum, P., Silvestri, S., Nelson, K.A., Riedle, E., Schoenlein, R.W., Coherence and Quantum Technology, and Molecular Materials and Nanosystems

Subjects
Materials science, Optics, Streak camera, business.industry, Electron bunches, Ultrafast electron diffraction, Resolution (electron density), Physics::Optics, Physics::Accelerator Physics, business, Ultrashort pulse
Abstract

We have designed and built a 3 GHz radio-frequency cavity for use as an ultrafast streak camera to measure with 10 fs resolution the duration of electron bunches that are suitable for single-shot ultrafast electron diffraction experiments. We present our first measurements of 10 ps electron bunches and explain how we will measure sub-100 fs bunch durations.

Published
2008

27. Phase fluctuations and the absence of topological defects in a photo-excited charge-ordered nickelate

Author

Lee, W.S., primary, Chuang, Y.D., additional, Moore, R.G., additional, Zhu, Y., additional, Patthey, L., additional, Trigo, M., additional, Lu, D.H., additional, Kirchmann, P.S., additional, Krupin, O., additional, Yi, M., additional, Langner, M., additional, Huse, N., additional, Robinson, J.S., additional, Chen, Y., additional, Zhou, S.Y., additional, Coslovich, G., additional, Huber, B., additional, Reis, D.A., additional, Kaindl, R.A., additional, Schoenlein, R.W., additional, Doering, D., additional, Denes, P., additional, Schlotter, W.F., additional, Turner, J.J., additional, Johnson, S.L., additional, Först, M., additional, Sasagawa, T., additional, Kung, Y.F., additional, Sorini, A.P., additional, Kemper, A.F., additional, Moritz, B., additional, Devereaux, T.P., additional, Lee, D.-H., additional, Shen, Z.X., additional, and Hussain, Z., additional

Published
2012
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46. Ultrafast Dynamics of Solid C60

Author

Dexheimer, S. L., primary, Mittleman, D. M., additional, Schoenlein, R.W., additional, Vareka, W., additional, Xiang, X.-D., additional, Zettl, A., additional, and Shank, C.V., additional

Published
1992
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