MPSD

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2016-11-30
10:41
OpenAccess [PUBDB-2016-05742] Journal Article
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Single-shot diffraction data from the Mimivirus particle using an X-ray free-electron laser
ddc:610
Free-electron lasers (FEL) hold the potential to revolutionize structural biology by producing X-ray pules short enough to outrun radiation damage, thus allowing imaging of biological samples without the limitation from radiation damage. Thus, a major part of the scientific case for the first FELs was three-dimensional (3D) reconstruction of non-crystalline biological objects. [...]
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2016-08-22
10:42
OpenAccess [PUBDB-2016-03283] Journal Article
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High-Field High-Repetition-Rate Sources for the Coherent THz Control of Matter
ddc:000
Ultrashort flashes of THz light with low photon energies of a few meV, but strong electric or magneticfield transients have recently been employed to prepare various fascinating nonequilibrium statesin matter. Here we present a new class of sources based on superradiant enhancement of radiationfrom relativistic electron bunches in a compact electron accelerator that we believe will revolutionizeexperiments in this field. [...]
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2016-08-22
10:24
OpenAccess [PUBDB-2016-03265] Journal Article
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Coupled Motion of Xe Clusters and Quantum Vortices in He Nanodroplets
ddc:530
Single He nanodroplets doped with Xe atoms are studied via ultrafast coherent x-ray diffraction imaging. The diffraction images show that rotating He nanodroplets about 200 nm in diameter contain a small number of symmetrically arranged quantum vortices decorated with Xe clusters. [...]
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2016-08-22
10:05
OpenAccess [PUBDB-2016-03250] Journal Article
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Stimulated x-ray Raman Scattering – a critical assessment of the building block of nonlinear x-ray spectroscopy
ddc:540
With the invention of femtosecond X-ray free-electron lasers (XFELs), studies of light-induced chemical reaction dynamics and structural dynamics reach a new era, allowing for time-resolved X-ray diffraction and spectroscopy. To ultimately probe coherent electron and nuclear dynamics on their natural time and length scales, coherent nonlinear X-ray spectroscopy schemes have been proposed. [...]
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2016-08-22
09:58
OpenAccess [PUBDB-2016-03241] Journal Article
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Synchronised photoreversion of spirooxazine ring opening in thin crystals to uncover ultrafast dynamics.
CrystEngComm 18(38), 7212 - 7216 (2016) [10.1039/C6CE01049K]  GO
ddc:540
Reversibility is an important issue that prevents ultrafast studies of chemical reactions in solid state due to product accumulation. Here we present an approach that makes use of spectrally-selected, post-excitation, ultrashort laser pulses to minimise photoproduct build-up, i.e. [...]
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2016-08-22
09:55
[PUBDB-2016-03238] Journal Article
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Parametric amplification of a superconducting plasma wave
Nature physics 12(11), 1012 - 1016 (2016) [10.1038/nphys3819]  GO
ddc:530
Many applications in photonics require all-optical manipulation of plasma waves1, which can concentrate electromagnetic energy on sub-wavelength length scales. This is difficult in metallic plasmas because of their small optical nonlinearities. [...]
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2016-08-22
09:32
OpenAccess [PUBDB-2016-03228] Journal Article
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Semiconductor saturable absorbers for ultrafast terahertz signals
ddc:530
We demonstrate saturable absorber behavior of n-type semiconductors GaAs, GaP, and Ge in theterahertz (THz) frequency range at room temperature using nonlinear THz spectroscopy. Thesaturation mechanism is based on a decrease in electron conductivity of semiconductors at highelectron momentum states, due to conduction band nonparabolicity and scattering into satellitevalleys in strong THz fields. [...]
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2016-08-22
09:31
OpenAccess [PUBDB-2016-03227] Journal Article
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Terahertz electro-absorption effect enabling femtosecond all-optical switching in semiconductor quantum dots
ddc:530
We demonstrate an instantaneous all-optical manipulation of optical absorption in InGaAs/GaAsquantum dots (QDs) via an electro-absorption effect induced by the electric field of an incidentfree-space terahertz signal. A terahertz signal with the full bandwidth of 3 THz was directly encodedonto an optical signal probing the absorption in QDs, resulting in the encoded temporal features asfast as 460 fs. [...]
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2016-08-22
09:27
OpenAccess [PUBDB-2016-03225] Journal Article
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A flexible apparatus for attosecond photoelectron spectroscopy of solids and surfaces
ddc:530
We describe an apparatus for attosecond photoelectron spectroscopy of solids and surfaces, whichcombines the generation of isolated attosecond extreme-ultraviolet (XUV) laser pulses by high har-monic generation in gases with time-resolved photoelectron detection and surface science techniquesin an ultrahigh vacuum environment. This versatile setup provides isolated attosecond pulses withphoton energies of up to 140 eV and few-cycle near infrared pulses for studying ultrafast electrondynamics in a large variety of surfaces and interfaces. [...]
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2016-08-22
09:23
[PUBDB-2016-03224] Journal Article
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Femtosecond electron diffraction: heralding the era of atomically resolved dynamics
ddc:530
One of the great dream experiments in Science is to directly observe atomic motions as theyoccur. Femtosecond electron diffraction provided the first ‘light’ of sufficient intensity toachieve this goal by attaining atomic resolution to structural changes on the relevanttimescales. [...]
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