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1. Spin, time, and angle resolved photoemission spectroscopy on WTe_{2}

Author

Mauro Fanciulli, Jakub Schusser, Min-I Lee, Zakariae El Youbi, Olivier Heckmann, Maria Christine Richter, Cephise Cacho, Carlo Spezzani, David Bresteau, Jean-François Hergott, Pascal D'Oliveira, Olivier Tcherbakoff, Thierry Ruchon, Jan Minár, and Karol Hricovini

Subjects
Physics, QC1-999
Abstract

We combined a spin resolved photoemission spectrometer with a high-harmonic generation (HHG) laser source in order to perform spin, time, and angle resolved photoemission spectroscopy (STARPES) experiments on the transition metal dichalcogenide bulk WTe_{2}, a possible Weyl type-II semimetal. Measurements at different femtosecond pump-probe delays and comparison with spin resolved one-step photoemission calculations provide insight into the spin polarization of electrons above the Fermi level in the region where Weyl points of WTe_{2} are expected. We observe a spin accumulation above the Weyl points region, which is consistent with a spin-selective bottleneck effect due to the presence of spin-polarized conelike electronic structure. Our results support the feasibility of STARPES with HHG, which despite being experimentally challenging provides a unique way to study spin dynamics in photoemission.

Published
2020
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2. Cavity-Enhanced Photodetachment of H− as a Means to Produce Energetic Neutral Beams for Plasma Heating

Author

Christophe Blondel, David Bresteau, and Cyril Drag

Subjects
photodetachment, magnetically confined fusion, neutral beam injection, plasma heating, optical cavity amplification, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Neutral beam injection, for plasma heating, will supposedly be achieved, in ITER, by collisional detachment of a pre-accelerated D − beam. Collisional detachment, however, makes use of a D 2 -filled neutralisation chamber, which has severe drawbacks, including the necessity to set the D − -ion source at −1 MV. Photodetachment, in contradistinction, would have several advantages as a neutralisation method, including the absence of gas injection, and the possibility to set the ion source close to the earth potential. Photodetachment, however, requires a very high laser flux. The presented work has consisted in implementing an optical cavity, with a finesse greater than 3000, to make such a high illumination possible with a state-of-the-art CW (continuous-wave) laser. A 1.2 keV 1 H − -beam (only 20 times slower than the 1 MeV 2 D − ion beams to be prepared for ITER) was photodetached with more-than-50% efficiency, with only 24 W of CW laser input. This experimental demonstration paves the way for developing real-size photoneutralizers, based on the implementation of refolded optical cavities around the ion beams of neutral beam injectors. Depending on whether the specifications of the laser power or the cavity finesse will be more difficult to achieve in real scale, different architectures can be considered, with greater or smaller numbers of optical refoldings or (inclusively) optical cavities in succession, on the beam to be neutralised.

Published
2019
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3. Angularly resolved photoionization dynamics in atoms and molecules combining temporally and spectrally resolved experiments at ATTOLab and Synchrotron SOLEIL

Author

Jennifer Joseph, Fabian Holzmeier, David Bresteau, Thierry Ruchon, Jean-Christophe Houver, Robert R. Lucchese, Danielle Dowek, Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Lawrence Berkeley National Laboratory [Berkeley] (LBNL), ANR-10-LABX-0039,PALM,Physics: Atoms, Light, Matter(2010), ANR-11-EQPX-0005,ATTOLAB,Plateforme pour la dynamique attoseconde(2011), European Project: 674960,H2020,H2020-MSCA-ITN-2015,ASPIRE(2016), and European Project: 871124

Subjects
[PHYS]Physics [physics], General Physics and Astronomy, General Materials Science, Physical and Theoretical Chemistry
Abstract

International audience; We report results for XUV-IR two-photon ionization of Ar, Ne, NO, and O2, where an XUV attosecond pulse train is superimposed with a synchronized IR pulse, obtained at the ATTOLab laser facility using electron–ion coincidence 3D momentum spectroscopy. Temporally resolved photoelectron angular distributions providing angle-resolved time-delays for np ionization of Ar and Ne, achieved by reconstruction of attosecond beating by interference of two-photon transitions through a unified formalism (Joseph et al. in J Phys B At Mol Opt Phys 53:184007, 2020), are summarized. For inner valence XUV-IR dissociative photoionization of NO and O2 molecules, we report electron–ion kinetic energy correlation diagrams and disentangle the dissociative photoionization processes relying on parallel XUV experiments at Synchrotron SOLEIL. For ionization into the NO+(c3Π) ionic state, extending the formalism developed for single-photon ionization, we focus on photoelectron angular distributions averaged on the delay between the XUV and the IR field in the field frame, molecular frame, and electron frame of reference.

Published
2023
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4. Anisotropic dynamics of two-photon ionization: An attosecond movie of photoemission

Author

Alice Autuori, Dominique Platzer, Mariusz Lejman, Guillaume Gallician, Lucie Maëder, Antoine Covolo, Lea Bosse, Malay Dalui, David Bresteau, Jean-François Hergott, Olivier Tcherbakoff, Hugo J. B. Marroux, Vincent Loriot, Franck Lépine, Lionel Poisson, Richard Taïeb, Jérémie Caillat, Pascal Salières, Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Serveurs Laser (SLIC), Structure et dynamique multi-échelle des édifices moléculaires (DYNAMO), Institut Lumière Matière [Villeurbanne] (ILM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Dynamique Réactionnelle (DyR), Laboratoire de Chimie Physique - Matière et Rayonnement (LCPMR), Institut de Chimie du CNRS (INC)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ANR-20-CE30-0007,DECAP,Décrypter la cohérence dans la photoionisation attoseconde(2020), ANR-15-CE30-0001,CIMBAAD,Contrôle de l'ionisation moléculaire aux échelles attoseconde et Angström(2015), ANR-11-EQPX-0005,ATTOLAB,Plateforme pour la dynamique attoseconde(2011), ANR-10-LABX-0039,PALM,Physics: Atoms, Light, Matter(2010), and European Project: 871124

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Multidisciplinary, Atomic Physics (physics.atom-ph), Physics::Atomic and Molecular Clusters, FOS: Physical sciences, Physics::Atomic Physics, Physics - Atomic Physics
Abstract

Imaging in real time the complete dynamics of a process as fundamental as photoemission has long been out of reach due to the difficulty of combining attosecond temporal resolution with fine spectral and angular resolutions. Here, we achieve full decoding of the intricate angle-dependent dynamics of a photoemission process in helium, spectrally and anisotropically structured by twophoton transitions through intermediate bound states. Using spectrally- and angularly-resolved attosecond electron interferometry, we characterize the complex-valued transition probability amplitude towards the photoelectron quantum state. This allows reconstructing in space, time and energy the complete formation of the photoionized wavepacket., Comment: 7 pages, 4 figures

Published
2022
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5. In Situ Sub-50-Attosecond Active Stabilization of the Delay Between Infrared and Extreme-Ultraviolet Light Pulses

Author

Thierry Ruchon, Jean-François Hergott, Martin Luttmann, O. Tcherbakoff, David Bresteau, Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Serveurs Laser (SLIC), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Electron spectrometer, Atomic Physics (physics.atom-ph), Attosecond, Phase (waves), FOS: Physical sciences, General Physics and Astronomy, 02 engineering and technology, Photoionization, 01 natural sciences, Physics - Atomic Physics, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], Optics, Ionization, 0103 physical sciences, 010306 general physics, [PHYS]Physics [physics], Physics, business.industry, 021001 nanoscience & nanotechnology, Interferometry, Modulation, Extreme ultraviolet, 0210 nano-technology, business, Optics (physics.optics), Physics - Optics
Abstract

The blooming of attosecond science (1 as = $10^{-18}$ s) has raised the need to exquisitely control the delay between two ultrashort light pulses, one of them being intense and in the visible spectral range, while the second is weak and in the Extreme Ultra-Violet spectral range. Here we introduce a robust technique, named LIZARD (Laser-dressed IoniZation for the Adjustment of the pump-pRobe Delay), allowing an active stabilization of this pump-probe delay. The originality of the method lies in an error signal calculated from a two-photon photoelectron signal obtained by photoionizing a gas target in an electronic spectrometer with the two superimposed beams. The modulation of sidebands in phase quadrature allows us to perform an \textit{in situ} measurement of the pump-probe phase, and to compensate for fluctuations with an uniform noise sensitivity over a large range of delays. Despite an interferometer length of several meters, we achieved a long term stability of 28 as RMS over hours. This method could be applied to the stabilization of other types of two-color interferometers, provided that one of the propagating beams is capable of photoionizing a target., 10 pages, 8 figures

Published
2021
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6. Electromagnetic theory of Helicoidal Dichroism in reflection from magnetic structures

Author

Thierry Ruchon, Martin Luttmann, Mekha Vimal, David Bresteau, Maurizio Sacchi, Mauro Fanciulli, Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Cergy Pontoise (UCP), Université Paris-Seine, Croissance et propriétés de systèmes hybrides en couches minces (INSP-E8), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), ANR-11-EQPX-0005,ATTOLAB,Plateforme pour la dynamique attoseconde(2011), ANR-14-CE32-0010,Xstase,Étude du moment angulaire de faisceaux lumineux XUV: synthèse et transferts(2014), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Angular momentum, Kerr effect, Strongly Correlated Electrons (cond-mat.str-el), Condensed matter physics, Magnetic structure, FOS: Physical sciences, Physics::Optics, 01 natural sciences, Symmetry (physics), 010305 fluids & plasmas, Magnetization, Condensed Matter - Strongly Correlated Electrons, 0103 physical sciences, Reflection (physics), [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], Light beam, Classical electromagnetism, 010306 general physics, Optics (physics.optics), Physics - Optics
Abstract

We present the classical electromagnetic theory framework of reflection of a light beam carrying Orbital Angular Momentum (OAM) by an in-plane magnetic structure with generic symmetry. Depending on the magnetization symmetry, we find a change in the OAM content of the reflected beam due to magneto-optic interaction and an asymmetric far-field intensity profile. This leads to three types of Magnetic Helicoidal Dichroism (MHD), observed when switching the OAM of the incoming beam, the magnetization sign, or both. In cases of sufficient symmetries, we establish analytical formulas which link an experimentally accessible MHD signal up to $10\%$ to the Magneto-Optical Kerr Effect (MOKE) constants. Magnetic vortices are particularly enlightening and promising targets, for which we explore the implications of our theory in the joint publication XX XXX XXXXXX., A joint manuscript was submitted at the same time

Published
2021
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7. Spin, time, and angle resolved photoemission spectroscopy on WTe2

Author

Karol Hricovini, Min-I Lee, David Bresteau, J.-F. Hergott, Zakariae El Youbi, Jakub Schusser, O. Heckmann, Jan Minár, Cephise Cacho, O. Tcherbakoff, Carlo Spezzani, Thierry Ruchon, Mauro Fanciulli, Maria Christine Richter, P. d’Oliveira, Laboratoire de Physique des Matériaux et des Surfaces (LPMS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CY Cergy Paris Université (CY), Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), University of West Bohemia [Plzeň ], DIAMOND Light source, Elettra Sincrotrone Trieste, Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Serveurs Laser (SLIC), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Electronic structure, Materials science, FOS: Physical sciences, Angle-resolved photoemission spectroscopy, 02 engineering and technology, 7. Clean energy, 01 natural sciences, Korringa-Kohn- Rostoker method, Time & angle-resolved photoemission spectroscopy, Transition metal, 0103 physical sciences, 010306 general physics, Spin-½, [PHYS]Physics [physics], Condensed Matter - Materials Science, Condensed matter physics, Spin polarization, Topological classification, Materials Science (cond-mat.mtrl-sci), Transition-metal dichalcogenide, 021001 nanoscience & nanotechnology, Spin-resolved photoemission spectroscopy, Pulse (physics), High-harmonic generation, Condensed Matter::Strongly Correlated Electrons, 0210 nano-technology, Weyl semimetal
Abstract

We combined a spin-resolved photoemission spectrometer with a high-harmonic generation (HHG) laser source in order to perform spin-, time- and angle-resolved photoemission spectroscopy (STARPES) experiments on the transition metal dichalcogenide bulk WTe$_2$, a possible Weyl type-II semimetal. Measurements at different femtosecond pump-probe delays and comparison with spin-resolved one-step photoemission calculations provide insight into the spin polarization of electrons above the Fermi level in the region where Weyl points of WTe$_2$ are expected. We observe a spin accumulation above the Weyl points region, that is consistent with a spin-selective bottleneck effect due to the presence of spin polarized cone-like electronic structure. Our results support the feasibility of STARPES with HHG, which despite being experimentally challenging provides a unique way to study spin dynamics in photoemission., 6 pages, 4 figures

Published
2020
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8. Transfer of Orbital Angular Momentum in High Harmonic Generation using two Driving Beams

Author

Thierry Ruchon, Giovanni De Ninno, O. Gobert, David Bresteau, C Chappuis, Thierry Auguste, David Gauthier, and Romain Géneaux

Subjects
Quantum optics, Wavefront, Physics, 0303 health sciences, Angular momentum, Photon, business.industry, Attosecond, Physics::Optics, Polarization (waves), 01 natural sciences, 03 medical and health sciences, Optics, 0103 physical sciences, High harmonic generation, Light beam, 010306 general physics, business, 030304 developmental biology
Abstract

Light beams may carry both a spin and an orbital angular momentum (OAM). While the former is associated to their polarization state, the latter stems from the geometrical properties of their wavefront. In their prototypical form, beams with OAM have "donuts-like" intensity profile and helicoidal wavefront, carrying integral multiples of h as angular momenta. Since their "rediscovery" in the late 90's, beams with OAM of visible wavelengths have found innumerable applications in quantum optics, microscopy or information transfer. A major recent development was the generation of such beams with much smaller wavelengths — in the extreme ultraviolet (XUV) — using synchrotron sources, free electron lasers as well as high harmonic sources (HHG). In this latter case, it creates ultrashort XUV sources of beams with OAM, suited for time-resolved applications at femtosecond and attosecond time scales. Remarkably, we showed that even though HHG is a non-perturbative process, the OAM transfer from the driving beam to the harmonics was purely parametric; i.e., the q-th harmonic — which can be thought as the upconversion of q infrared photons — carries q times the OAM of the driver [3, 4]. However, this rule limits severely the flexibility in choosing the OAM of the XUV emission.

Published
2019
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9. Cavity-Enhanced Photodetachment of H− as a Means to Produce Energetic Neutral Beams for Plasma Heating

Author

C. Blondel, Cyril Drag, and David Bresteau

Subjects
optical cavity amplification, Nuclear and High Energy Physics, Materials science, Physics::Optics, 01 natural sciences, 010305 fluids & plasmas, Ion, law.invention, Finesse, neutral beam injection, Physics::Plasma Physics, law, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Laser power scaling, 010306 general physics, technology, industry, and agriculture, photodetachment, plasma heating, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, Neutral beam injection, Ion source, Optical cavity, Physics::Space Physics, Physics::Accelerator Physics, lcsh:QC770-798, Atomic physics, magnetically confined fusion, human activities, Beam (structure)
Abstract

Neutral beam injection, for plasma heating, will supposedly be achieved, in ITER, by collisional detachment of a pre-accelerated D &minus, beam. Collisional detachment, however, makes use of a D 2 -filled neutralisation chamber, which has severe drawbacks, including the necessity to set the D &minus, ion source at &minus, 1 MV. Photodetachment, in contradistinction, would have several advantages as a neutralisation method, including the absence of gas injection, and the possibility to set the ion source close to the earth potential. Photodetachment, however, requires a very high laser flux. The presented work has consisted in implementing an optical cavity, with a finesse greater than 3000, to make such a high illumination possible with a state-of-the-art CW (continuous-wave) laser. A 1.2 keV 1 H &minus, beam (only 20 times slower than the 1 MeV 2 D &minus, ion beams to be prepared for ITER) was photodetached with more-than-50% efficiency, with only 24 W of CW laser input. This experimental demonstration paves the way for developing real-size photoneutralizers, based on the implementation of refolded optical cavities around the ion beams of neutral beam injectors. Depending on whether the specifications of the laser power or the cavity finesse will be more difficult to achieve in real scale, different architectures can be considered, with greater or smaller numbers of optical refoldings or (inclusively) optical cavities in succession, on the beam to be neutralised.

Published
2019

10. High-order harmonic generation in an active grating

Author

O. Gobert, Thierry Auguste, David Bresteau, Thierry Ruchon, C Chappuis, Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Physique à Haute Intensité (PHI), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Diffraction, business.industry, Attosecond, Phase (waves), Physics::Optics, Grating, Laser, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, law.invention, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], Optics, law, 0103 physical sciences, Femtosecond, Physics::Atomic and Molecular Clusters, High harmonic generation, Physics::Atomic Physics, High order, 010306 general physics, business
Abstract

International audience; We study theoretically and experimentally high-order harmonic generation (HHG) using two noncollinear driving fields focused in gases. We show that these two fields form a nonstationary blazed active grating in the generation medium. The intensity and phase structure of this grating rule the far-field properties of the emission, such as the relative amplitude of the diffraction orders. Full macroscopic calculations and experiments support this wave-based picture of the process, complementing and extending its standard “photon” picture. This insight into the HHG process allows us to envision structuration schemes to convert femtosecond lasers to attosecond pulses with increased efficiency.

Published
2019
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11. Pump-Probe Delay Controlled by Laser-dressed Ionization with Isolated Attosecond Pulses

Author

Martin Luttmann, Thierry Ruchon, David Bresteau, Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Photoemission spectroscopy, business.industry, QC1-999, Attosecond, Physics::Optics, Laser, Streaking, law.invention, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], Amplitude, Optics, law, Ionization, Extreme ultraviolet, Physics::Atomic and Molecular Clusters, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Physics::Atomic Physics, business, In-phase and quadrature components
Abstract

International audience; In a recent work [1], we demonstrated how laser-dressed ionization can be harnessed to control with attosecond accuracy the time delay between an extreme-ultraviolet (XUV) attosecond pulse train and an infrared (IR) femtosecond pulse. In this case, the comb-like photoelectron spectrum obtained by ionizing a gas target with the two superimposed beams exhibits peaks oscillating with the delay. Two of them can be found to oscillate in phase quadrature, allowing an optimal measurement and stabilization of the delay over a large range. Here we expand this technique to isolated attosecond pulses, by taking advantage of the delay-modulation of attosecond streaking traces. Although the photoelectron spectrum contains no peaks in that case, it is possible to reconstruct the pump-probe delay by simply monitoring the mean energy of the spectrum and the amplitude at this energy. In general, we find that active delay stabilization based on laser-dressed ionization is possible as long as the XUV pulses are chirped.

Published
2021
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12. Angle-resolved studies of XUV–IR two-photon ionization in the RABBITT scheme

Author

Carlo Spezzani, David Bresteau, Fabian Holzmeier, Thierry Ruchon, Danielle Dowek, J. Joseph, J.-F. Hergott, O. Tcherbakoff, J. C. Houver, and Pascal D'Oliveira

Subjects
Physics, Two-photon excitation microscopy, Extreme ultraviolet, Ionization, 0103 physical sciences, Photoionization, Atomic physics, 010306 general physics, Condensed Matter Physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, 010305 fluids & plasmas
Published
2020
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14. Intra-cavity photodetachment microscopy and the electron affinity of germanium

Author

C. Blondel, David Bresteau, and Cyril Drag

Subjects
History, Ion beam, Chemistry, chemistry.chemical_element, Germanium, Electron, Computer Science Applications, Education, law.invention, Resonator, law, Electron affinity, Optical cavity, Microscopy, Atomic physics, Lepton
Abstract

Photodetachment microscopy is performed inside an optical cavity, on an ion beam and with an optical mode narrow enough not to blur out the output electron interferogram. This setting is used for an updated measurement of the electron affinity of germanium. Amplification of the photodetachment probability obtained in an optical cavity also opens the way to photodetachment microscopy with a p electron wave, even though photodetachment cross-sections are reduced considerably in this case, when compared to s-wave detachment, by the centrifugal barrier.

Published
2015
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16. Intra-cavity photodetachment microscopy and the electron affinity of germanium

Author

Ph Babilotte, Cyril Drag, C. Blondel, and David Bresteau

Subjects
Physics, Physics::Optics, chemistry.chemical_element, Germanium, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, Ion source, law.invention, Ion, chemistry, law, Optical cavity, Electron affinity, Microscopy, Physics::Atomic Physics, Atomic physics, Excitation
Abstract

A beam of Ge− ions produced by a cesium sputtering ion source is photodetached, in the presence of an electric field, inside a linear optical cavity injected with a single mode ring Ti:Sa laser. The laser wavenumber can be set either above the highest fine-structure excitation threshold or just above the , intermediate fine-structure threshold of the ground-term of Ge I. A single-electron interferogram is produced, according to the principles of photodetachment microscopy, which contains both photoelectron energies produced by the two opposite wave vectors contained in the optical cavity. This makes the Doppler-free measurement of the photodetachment threshold even more direct than with the usual double-spot photodetachment microscopy method, at the expense of some reduction of the contrast in the interferograms. Both methods concur in producing a revised value of the electron affinity of germanium: or , one order of magnitude more precise and significantly smaller than the last measured value or . This new technique can be applied to weaker detachment thresholds or p-wave detachment.

Published
2015
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17. Observation of magnetic helicoidal dichroism with extreme ultraviolet light vortices

Author

Mauro Fanciulli, Matteo Pancaldi, Emanuele Pedersoli, Mekha Vimal, David Bresteau, Martin Luttmann, Dario De Angelis, Primož Rebernik Ribič, Benedikt Rösner, Christian David, Carlo Spezzani, Michele Manfredda, Ricardo Sousa, Ioan-Lucian Prejbeanu, Laurent Vila, Bernard Dieny, Giovanni De Ninno, Flavio Capotondi, Maurizio Sacchi, Thierry Ruchon, Prejbeanu, Ioan Lucian, Plateforme pour la dynamique attoseconde - - ATTOLAB2011 - ANR-11-EQPX-0005 - EQPX - VALID, Appel à projets générique - Étude du moment angulaire de faisceaux lumineux XUV: synthèse et transferts - - Xstase2014 - ANR-14-CE32-0010 - Appel à projets générique - VALID, NANOSCIENCE FOUNDRIES AND FINE ANALYSIS - EUROPE - NFFA-Europe - - H20202015-09-01 - 2019-08-31 - 654360 - VALID, Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des Matériaux et des Surfaces (LPMS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CY Cergy Paris Université (CY), Elettra Sincrotrone Trieste, Paul Scherrer Institute (PSI), SPINtronique et TEchnologie des Composants (SPINTEC), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche Interdisciplinaire de Grenoble (IRIG), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA), Laboratory of Quantum Optics, University of Nova Gorica, Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Institut des Nanosciences de Paris (INSP), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Swiss National Science Foundation project No. P2ELP2 181877, ANR-11-EQPX-0005,ATTOLAB,Plateforme pour la dynamique attoseconde(2011), ANR-14-CE32-0010,Xstase,Étude du moment angulaire de faisceaux lumineux XUV: synthèse et transferts(2014), European Project: 654360,H2020,H2020-INFRAIA-2014-2015,NFFA-Europe(2015), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Attophysique (ATTO), Institut Rayonnement Matière de Saclay (IRAMIS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire Interactions, Dynamiques et Lasers (ex SPAM) (LIDyl), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), State Key Laboratory of Quantum Optics and Quantum Optics devices, Shanxi University, Croissance et propriétés de systèmes hybrides en couches minces (INSP-E8), and Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [PHYS.MECA.MEMA]Physics [physics]/Mechanics [physics]/Mechanics of materials [physics.class-ph], [PHYS]Physics [physics], FOS: Physical sciences, General Physics and Astronomy, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], Optics (physics.optics), [PHYS] Physics [physics], Physics - Optics
Abstract

We report on the experimental evidence of magnetic helicoidal dichroism, observed in the interaction of an extreme ultraviolet vortex beam carrying orbital angular momentum with a magnetic vortex. Numerical simulations based on classical electromagnetic theory show that this dichroism is based on the interference of light modes with different orbital angular momenta, which are populated after the interaction between the light phase chirality and the magnetic topology. This observation gives insight into the interplay between orbital angular momentum and magnetism, and sets the framework for the development of new analytical tools to investigate ultrafast magnetization dynamics., 7 pages, 4 figures

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