Search Results
Quenching of material dependence in few-cycle driven electron acceleration from nanoparticles under many-particle charge interaction
2016-12-25, Rupp, Philipp, Seiffert, Lennart, Liu, Qingcao, Süßmann, Frederik, Ahn, Byungnam, Förg, Benjamin, Schäfer, Christian G., Gallei, Markus, Mondes, Valerie, Kessel, Alexander, Trushin, Sergei, Graf, Christina, Rühl, Eckart, Lee, Jinwoo, Kim, Min Su, Kim, Dong Eon, Fennel, Thomas, Kling, Matthias F., Zherebtsov, Sergey
The excitation of nanoscale near-fields with ultrashort and intense laser pulses of well-defined waveform enables strongly spatially and temporally localized electron emission, opening up the possibility for the generation of attosecond electron pulses. Here, we investigate the electron photoemission from isolated nanoparticles of different materials in few-cycle laser fields at intensities where the Coulomb field of the ionized electrons and residual ions significantly contribute to the electron acceleration process. The dependences of the electron cut-off energy on the material’s dielectric properties and electron binding energy are investigated systematically in both experiments and semi-classical simulations. We find that for sufficiently high near-field intensities the material dependence of the acceleration in the enhanced near-fields is quenched by many-particle charge-interaction.
Nanoplasmonic electron acceleration by attosecond-controlled forward rescattering in silver clusters
2017, Passig, Johannes, Zherebtsov, Sergey, Irsig, Robert, Arbeiter, Mathias, Peltz, Christian, Göde, Sebastian, Skruszewicz, Slawomir, Meiwes-Broer, Karl-Heinz, Tiggesbäumker, Josef, Kling, Matthias F., Fennel, Thomas
In the strong-field photoemission from atoms, molecules, and surfaces, the fastest electrons emerge from tunneling and subsequent field-driven recollision, followed by elastic backscattering. This rescattering picture is central to attosecond science and enables control of the electron's trajectory via the sub-cycle evolution of the laser electric field. Here we reveal a so far unexplored route for waveform-controlled electron acceleration emerging from forward rescattering in resonant plasmonic systems. We studied plasmon-enhanced photoemission from silver clusters and found that the directional acceleration can be controlled up to high kinetic energy with the relative phase of a two-color laser field. Our analysis reveals that the cluster's plasmonic near-field establishes a sub-cycle directional gate that enables the selective acceleration. The identified generic mechanism offers robust attosecond control of the electron acceleration at plasmonic nanostructures, opening perspectives for laser-based sources of attosecond electron pulses.
All-optical spatio-temporal control of electron emission from SiO2 nanospheres with femtosecond two-color laser fields
2019, Liu, Qingcao, Zherebtsov, Sergey, Seiffert, Lennart, Skruszewicz, Slawomir, Zietlow, Dominik, Ahn, Seongjin, Rupp, Philipp, Wnuk, Pawel, Sun, Shaohua, Kessel, Alexander, Trushin, Sergei, Schlander, Annika, Kim, Dongeon, Rühl, Eckart, Ciappina, Marcelo F., Tiggesbäumker, Josef, Gallei, Markus, Fennel, Thomas, Kling1, Matthias F.
Field localization by nanostructures illuminated with laser pulses of well-defined waveform enables spatio-temporal tailoring of the near-fields for sub-cycle control of electron dynamics at the nanoscale. Here, we apply intense linearly-polarized two-color laser pulses for all-optical control of the highest energy electron emission from SiO2 nanoparticles. For the size regime where light propagation effects become important, we demonstrate the possibility to control the preferential emission angle of a considerable fraction of the fastest electrons by varying the relative phase of the two-color field. Trajectory based semi-classical simulations show that for the investigated nanoparticle size range the directional steering can be attributed to the two-color effect on the electron trajectories, while the accompanied modification of the spatial distribution of the ionization rate on the nanoparticle surface has only a minor effect. © 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft
Three-Dimensional Shapes of Spinning Helium Nanodroplets
2018, Langbehn, Bruno, Sander, Katharina, Ovcharenko, Yevheniy, Peltz, Christian, Clark, Andrew, Coreno, Marcello, Cucini, Riccardo, Drabbels, Marcel, Finetti, Paola, Di Fraia, Michele, Giannessi, Luca, Grazioli, Cesare, Iablonskyi, Denys, LaForge, Aaron C., Nishiyama, Toshiyuki, Oliver Álvarez de Lara, Verónica, Piseri, Paolo, Plekan, Oksana, Ueda, Kiyoshi, Zimmermann, Julian, Prince, Kevin C., Stienkemeier, Frank, Callegari, Carlo, Fennel, Thomas, Rupp, Daniela, Möller, Thomas
A significant fraction of superfluid helium nanodroplets produced in a free-jet expansion has been observed to gain high angular momentum resulting in large centrifugal deformation. We measured single-shot diffraction patterns of individual rotating helium nanodroplets up to large scattering angles using intense extreme ultraviolet light pulses from the FERMI free-electron laser. Distinct asymmetric features in the wide-angle diffraction patterns enable the unique and systematic identification of the three-dimensional droplet shapes. The analysis of a large data set allows us to follow the evolution from axisymmetric oblate to triaxial prolate and two-lobed droplets. We find that the shapes of spinning superfluid helium droplets exhibit the same stages as classical rotating droplets while the previously reported metastable, oblate shapes of quantum droplets are not observed. Our three-dimensional analysis represents a valuable landmark for clarifying the interrelation between morphology and superfluidity on the nanometer scale.
Intracluster Coulombic decay following intense NIR ionization of clusters
2015, Schütte, Bernd, Arbeiter, Mathias, Fennel, Thomas, Jabbari, Ghazal, Gokhberg, Kirill, Kuleff, Alexander I., Vrakking, Marc J. J., Rouzée, Arnaud
We report on the observation of a novel intracluster Coulombic decay process following Rydberg atom formation in clusters ionized by intense near-infrared fields. A new decay channel emerges, in which a Rydberg atom relaxes to the ground state by transferring its excess energy to a weakly bound electron in the environment that is emitted from the cluster. We find evidence for this process in the electron spectra, where a peak close to the corresponding atomic ionization potential is observed. For Ar clusters, a decay time of 87 ps is measured, which is significantly longer than in previous time-resolved studies of interatomic Coulombic decay.
Publisher Correction: Coherent diffractive imaging of single helium nanodroplets with a high harmonic generation source (Nature communications (2017) 8 1 (493))
2018, Rupp, Daniela, Monserud, Nils, Langbehn, Bruno, Sauppe, Mario, Zimmermann, Julian, Ovcharenko, Yevheniy, Möller, Thomas, Frassetto, Fabio, Poletto, Luca, Trabattoni, Andrea, Calegari, Francesca, Nisoli, Mauro, Sander, Katharina, Peltz, Christian, Vrakking, Marc J., Fennel, Thomas, Rouzée, Arnaud
In the original version of this Article, the affiliation for Luca Poletto was incorrectly given as 'European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Hamburg, Germany', instead of the correct 'CNR, Istituto di Fotonica e Nanotecnologie Padova, Via Trasea 7, 35131 Padova, Italy'. This has now been corrected in both the PDF and HTML versions of the Article.
Coherent diffractive imaging of single helium nanodroplets with a high harmonic generation source
2017, Rupp, Daniela, Monserud, Nils, Langbehn, Bruno, Sauppe, Mario, Zimmermann, Julian, Ovcharenko, Yevheniy, Möller, Thomas, Frassetto, Fabio, Poletto, Luca, Trabattoni, Andrea, Calegari, Francesca, Nisoli, Mauro, Sander, Katharina, Peltz, Christian, J. Vrakking, Marc, Fennel, Thomas, Rouzée, Arnaud
Coherent diffractive imaging of individual free nanoparticles has opened routes for the in situ analysis of their transient structural, optical, and electronic properties. So far, single-shot single-particle diffraction was assumed to be feasible only at extreme ultraviolet and X-ray free-electron lasers, restricting this research field to large-scale facilities. Here we demonstrate single-shot imaging of isolated helium nanodroplets using extreme ultraviolet pulses from a femtosecond-laser-driven high harmonic source. We obtain bright wide-Angle scattering patterns, that allow us to uniquely identify hitherto unresolved prolate shapes of superfluid helium droplets. Our results mark the advent of single-shot gas-phase nanoscopy with lab-based short-wavelength pulses and pave the way to ultrafast coherent diffractive imaging with phase-controlled multicolor fields and attosecond pulses.
Correlated electronic decay following intense near-infrared ionization of clusters
2015, Schütte, Bernd, Arbeiter, Mathias, Fennel, Thomas, Jabbari, Ghazal, Kuleff, Alexander I., Vrakking, Marc J. J., Rouzée, Arnaud
We report on a novel correlated electronic decay process following extensive Rydberg atom formation in clusters ionized by intense near-infrared fields. A peak close to the atomic ionization potential is found in the electron kinetic energy spectrum. This new contribution is attributed to an energy transfer between two electrons, where one electron decays from a Rydberg state to the ground state and transfers its excess energy to a weakly bound cluster electron in the environment that can escape from the cluster. The process is a result of nanoplasma formation and is therefore expected to be important, whenever intense laser pulses interact with nanometer-sized particles.
Publisher Correction: Nanoplasmonic electron acceleration by attosecond-controlled forward rescattering in silver clusters (Nature communications (2017) 8 1 (1181))
2018, Passig, Johannes, Zherebtsov, Sergey, Irsig, Robert, Arbeiter, Mathias, Peltz, Christian, Göde, Sebastian, Skruszewicz, Slawomir, Meiwes-Broer, Karl-Heinz, Tiggesbäumker, Josef, Kling, Matthias F., Fennel, Thomas
The original PDF version of this Article contained an error in Equation 1. The original HTML version of this Article contained errors in Equation 2 and Equation 4. These errors have now been corrected in both the PDF and the HTML versions of the Article. The original PDF version of this Article contained an error in Equation 1. A dot over the first occurrence of the variable ri was missing, and incorrectly read: (Formula Presented). The correct form of Equation 1 is as follows: (Formula Presented). This has now been corrected in the PDF version of the Article. The HTML version was correct from the time of publication. The original HTML version of this Article contained errors in Equation 2 and Equation 4. In Equation 2, a circle over the first occurrence of the variable ri replaced the intended dot, and incorrectly read: (Formula Presented). The correct form of Equation 2 is as follows: (Formula Presented). In Equation 4, circles over the first and fifth occurrences of the variable ri replaced the intended dots, and incorrectly read: (Formula Presented). The correct form of Equation 4 is as follows: (Formula Presented). This has now been corrected in the HTML version of the Article. The PDF version was correct from the time of publication.
Recombination dynamics of clusters in intense extreme-ultraviolet and near-infrared fields
2015, Schütte, Bernd, Oelze, Tim, Krikunova, Maria, Arbeiter, Mathias, Fennel, Thomas, Vrakking, Marc J. J., Rouzée, Arnaud
We investigate electron-ion recombination processes in clusters exposed to intense extreme-ultraviolet (XUV) or near-infrared (NIR) pulses. Using the technique of reionization of excited atoms from recombination (REAR), recently introduced in Schütte et al (2014 Phys. Rev. Lett. 112 253401), a large population of excited atoms, which are formed in the nanoplasma during cluster expansion, is identified under both ionization conditions. For intense XUV ionization of clusters, we find that the significance of recombination increases for increasing cluster sizes. In addition, larger fragments are strongly affected by recombination as well, as shown for the case of dimers. We demonstrate that for mixed Ar–Xe clusters exposed to intense NIR pulses, excited atoms and ions are preferentially formed in the Xe core. As a result of electron-ion recombination, higher charge states of Xe are efficiently suppressed, leading to an overall reduced expansion speed of the cluster core in comparison to the shell.