A5034440038- Laser-Matter Interactions and Applications
- Orbital Angular Momentum in Optics
- Spectroscopy and Quantum Chemical Studies
- Laser-Plasma Interactions and Diagnostics
- Advanced X-ray Imaging Techniques
- Advanced Fiber Laser Technologies
- Advanced Chemical Physics Studies
- Advanced Electron Microscopy Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Crystallography and Radiation Phenomena
- CO2 Reduction Techniques and Catalysts
- Quantum optics and atomic interactions
- Quantum Information and Cryptography
- Semiconductor Quantum Structures and Devices
- Mass Spectrometry Techniques and Applications
- Electrocatalysts for Energy Conversion
- Metal-Catalyzed Oxygenation Mechanisms
- Diamond and Carbon-based Materials Research
- Advanced Materials and Mechanics
- Advanced NMR Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Tribology and Lubrication Engineering
- Atomic and Molecular Physics
- Quantum and electron transport phenomena
- Electron and X-Ray Spectroscopy Techniques
Universidad Autónoma de Madrid
2018-2024
Institute of Photonic Sciences
2017-2021
Universidad de Salamanca
2017-2019
Argonne National Laboratory
2013-2019
Alex's Lemonade Stand Foundation
2017
Southern Federal University
2016
University of Castilla-La Mancha
2015
Joint Institute for Laboratory Astrophysics
2011
Universitat Autònoma de Barcelona
2007-2008
We present a theoretical study of high-order harmonic generation (HHG) and propagation driven by an infrared field carrying orbital angular momentum (OAM). Our calculations unveil the following relevant phenomena: extreme-ultraviolet vortices are generated survive to effects, transport high-OAM multiples corresponding OAM driving and, finally, different emitted with similar divergence. also show possibility combining HHG phase locking produce attosecond pulses helical pulse structure.
This paper has been prepared by the Symphony collaboration (University of Warsaw, Uniwersytet Jagielloński, DESY/CNR and ICFO) on occasion 25th anniversary 'simple man's models' which underlie most phenomena that occur when intense ultrashort laser pulses interact with matter. The in question include high-harmonic generation (HHG), above-threshold ionization (ATI), non-sequential multielectron (NSMI). 'Simple provide both an intuitive basis for understanding numerical solutions...
Abstract Quantum optics with X-rays has long been a somewhat exotic activity, but it is now rapidly becoming relevant as precision x-ray and novel X-ray light sources, high-intensity lasers are available. This article gives an overview of the current state field outlook to future prospects. Keywords: quantum opticsparametric down conversionsingle-photon superradiancecollective Lamb shiftcoherent controlEITresonance fluorescence Acknowledgements work was supported by U.S. Department Energy,...
High-order harmonic generation (HHG) has been recently proven to produce extreme-ultraviolet (XUV) vortices from the nonlinear conversion of infrared twisted beams. Previous works have demonstrated a linear scaling law vortex charge with order. We demonstrate that this simple hides an unexpectedly rich scenario for buildup orbital angular momentum (OAM) due nonperturbative behavior HHG. The complexity these XUV beams appears only when HHG is driven by nonpure modes, where OAM content...
The future technological revolution in the production of ultrafast devices lies control materials that will speed-up transistors. recent discovery topological states matter promises a unique opportunity to address this challenge. However, and diagnostics remain hard achieve. Here, authors show an alternative distinguish phase by its nonlinear-light circular dichroism (CD): asymmetry material-light emissivity while is subjected right-circularly (RCP) left-circularly polarized (LCP)...
A molecular water oxidation catalyst based on the copper complex of general formula [(Lpy)CuII]2–, 22–, (Lpy is 4-pyrenyl-1,2-phenylenebis(oxamidate) ligand) has been rationally designed and prepared to support a more extended π-conjugation through its structure in contrast with homologue, [(L)CuII]2– catalyst, 12– (L o-phenylenebis(oxamidate)). The catalytic performance both catalysts comparatively studied homogeneous phase heterogeneous by π-stacking anchorage graphene-based electrodes. In...
X-ray transient absorption spectroscopy (X-TAS) has been used to study the light-induced hydrogen evolution reaction catalyzed by a tetradentate macrocyclic cobalt complex with formula [LCo(III)Cl2](+) (L = ligand), [Ru(bpy)3](2+) photosensitizer, and an equimolar mixture of sodium ascorbate/ascorbic acid electron donor in pure water. near edge structure (XANES) extended fine (EXAFS) analysis binary octahedral Co(III) precatalyst after illumination revealed situ formation Co(II) intermediate...
Vector beams, beams with a non-uniform state of polarization, have become an indispensable tool in many areas science and technology.Harnessing topological light properties paves the way to control manipulate light-matter interactions at different levels, from quantum macroscopic physics.Here we generate tabletop extreme ultraviolet (EUV) vector driven by high-order harmonic generation (HHG).Our experimental theoretical results demonstrate that HHG imprints polarization fundamental...
Free-electron lasers provide a source of x-ray pulses short enough and intense to drive nonlinearities in molecular systems. Impulsive interactions driven by these way create probe valence electron motions with high temporal spatial resolution. Observing electronic is crucial understand the role coherence chemical processes. A simple nonlinear technique for probing motion, impulsive stimulated Raman scattering (ISXRS), involves single interaction produce coherent superposition states. We...
Recent developments in attosecond technology led to tabletop X-ray spectroscopy the soft range, thus uniting element- and state-specificity of core-level x-ray absorption with time resolution follow electronic dynamics real time. We describe recent work investigations into materials such as Si, SiO2, GaN, Al2O3, Ti, TiO2, enabled by convergence these two capabilities. showcase state-of-the-art on isolated pulses for near edge (XANES) observe 3d-state semi-metal TiS2 at Ti L-edge (460 eV)....
Abstract We investigate theoretically the generation of extreme-ultraviolet (EUV) beams carrying fractional orbital angular momentum. To this end, we drive high-order harmonic with infrared conical refraction (CR) beams. show that emitted in EUV/soft x-ray regime preserve characteristic signatures driving beam, namely ringlike transverse intensity profile and CR-like polarization distribution. As a result, through spin momentum conservation, are momentum, they can be synthesized into...
Phase transitions of solids and structural transformations molecules are canonical examples important photo-induced processes, whose underlying mechanisms largely elude our comprehension due to inability correlate electronic excitation with atomic position in real time. Here, we present a decisive step towards such new methodology based on water-window-covering (284 eV 543 eV) attosecond soft X-ray pulses that can simultaneously access lattice parameters via dispersive absorption...
Vortex light beams are structures of the electromagnetic field with a spiral phase ramp around point-phase singularity. These vortices have many applications in optical regime, ranging from trapping and quantum information to spectroscopy microscopy. The extension into extreme-ultraviolet (XUV)/X-ray regime constitutes significant step forward bring those nanometer or even atomic scale. recent development new generation X-ray sources, refinement other techniques, such as harmonic generation,...
High-order harmonic generation stands as a unique nonlinear optical up-conversion process, mediated by laser-driven electron recollision mechanism, which has been shown to conserve energy, momentum, and spin orbital angular momentum. Here we present theoretical simulations demonstrate that this process also conserves mixture of the latter, torus-knot momentum $J_\gamma$, producing high-order harmonics with driving pulses are invariant under coordinated rotations. We charge $J_\gamma$ emitted...
High harmonic generation in atomic or molecular targets stands as a robust mechanism to produce coherent ultrashort pulses with controllable polarization the extreme-ultraviolet. However, production of elliptically circularly-polarized harmonics is not straightforward, demanding complex combinations drivers, use alignment techniques. Nevertheless, recent studies show feasibility high-harmonic solids. In contrast atoms and molecules, solids are high-density therefore more efficient radiation...
We study the high-harmonic spectrum emitted by a single-layer graphene, irradiated an ultrashort intense infrared laser pulse. show emergence of typical non-perturbative spectral features, harmonic plateau and cut-off, for mid-infrared driving fields, at fluences below damage threshold. In contrast to previous works, using THz drivings, we demonstrate that cut-off frequency saturates with intensity. Our results are derived from numerical integration time-dependent Schrödinger equation...
We report the light-induced electronic and geometric changes taking place within a heteroleptic CuI photosensitizer, namely [(xant)Cu(Me2 phenPh2 )]PF6 (xant=xantphos, Me2 =bathocuproine), by time-resolved X-ray absorption spectroscopy in ps-μs time regime. Time-resolved near edge structure (XANES) extended fine (EXAFS) analysis enabled elucidation of structural configuration copper center excited state as well its decay dynamics different solvent conditions with without triethylamine acting...
The technology to produce attosecond pulses opens the door manipulate electrons in matter before their loss of quantum coherence. In two-dimensional materials, where excitonic interactions dominate optical response, a laser-induced superposition excitons may induce migration charge across system. Here, instead tailoring laser pulse order control exciton superposition, we propose strain as more feasible and robust scheme migration. Uniaxial break crystal symmetry lift degeneracy 1s states. We...
Atomic-scale reproducibility and tunability endorse magnetic molecules as candidates for spin qubits spintronics. A major challenge is to implant those molecular spins into circuit geometries that may allow one, two, or a few be addressed in controlled way. Here, the formation of mechanically bonded, porphyrin dimeric rings around carbon nanotubes (mMINTs) presented. The mechanical bond places cores close contact with nanotube without disturbing their structures. combination spectroscopic...
The concomitant motion of electrons and nuclei on the femtosecond time scale marks fate chemical biological processes. Here we demonstrate ability to initiate track ultrafast electron rearrangement bond breaking site-specifically in real for carbon monoxide diatomic molecule. We employ a local resonant x-ray pump at oxygen atom probe shifts core-electron binding energy. observe charge redistribution accompanying core-excitation followed by Auger decay, eventually leading dissociation hole...
In this manuscript, we present a theoretical framework and its numerical implementation to simulate the out-of-equilibrium electron dynamics induced by interaction of ultrashort laser pulses in condensed-matter systems. Our approach is based on evolving real time density matrix system reciprocal space. It considers excitonic nonperturbative light-matter interactions. We show some relevant examples that illustrate efficiency flexibility describe realistic ultrafast spectroscopy experiments....
When light is transmitted through optically inhomogeneous and anisotropic media the spatial distribution of can be modified according to its input polarization state. A complete analysis this process, based on paraxial approximation, presented, we show how it exploited produce a spin-controlled change in orbital angular momentum beams propagating patterned space-variant optical axis phase plates. We also unveil new effect: development strong modulation upon variation path
X-ray free-electron lasers (XFELs) are now able to provide tunable pairs of intense sub-fs pulses in the soft x-ray regime, paving way for time-resolved investigations attosecond charge migration molecules. However, stochastic shot-to-shot variation XFEL may degrade and eventually hide observable features. We show by means state-of-the-art calculations that damping induced 260 eV p-aminophenol due generated at Linac Coherent Light Source is negligible comparison natural intrinsic fluctuation...