MPSD

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2017-04-21
10:55
OpenAccess [PUBDB-2017-01767] Journal Article
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Multiple Supersonic Phase Fronts Launched at a Complex-Oxide Heterointerface
ddc:550
Selective optical excitation of a substrate lattice can drive phase changes across heterointerfaces. This phenomenon is a nonequilibrium analogue of static strain control in heterostructures and may lead to new applications in optically controlled phase change devices [...]
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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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