Article
Biology
Maria Neus Ballester Roig, Tanya Leduc, Julien Dufort-Gervais, Yousra Maghmoul, Olivier Tastet, Valerie Mongrain
Summary: The alkaloid component of the traditional Asian medicine Uncaria, rhynchophylline (RHY), was found to enhance sleep and modify brain oscillations during sleep. RHY was shown to affect the expression of genes related to cell movement, apoptosis/necrosis, transcription/translation, and sleep regulation. These findings have important implications for sleep and brain research.
Article
Optics
Mina R. Bionta, Felix Ritzkowsky, Marco Turchetti, Yujia Yang, Dario Cattozzo Mor, William P. Putnam, Franz X. Kaertner, Karl K. Berggren, Phillip D. Keathley
Summary: This on-chip optoelectronic device is capable of sampling low-energy near-infrared waveforms with sub-optical-cycle resolution under ambient conditions. By using resonant nanoantennas for field-driven photoemission, the device can create attosecond electron bursts to probe weak optical waveforms and reveal the localized plasmonic dynamics of the emitting nanoantennas. Applications include broadband time-domain spectroscopy, time-domain analysis of nonlinear phenomena, and detailed investigations of strong-field light-matter interactions.
Review
Chemistry, Multidisciplinary
Jong Goo Kim, Eun Hyuk Choi, Yunbeom Lee, Hyotcherl Ihee
Summary: Vibrational wavepacket motions play a critical role in determining the reaction dynamics of photoinduced reactions. Tracking the trajectory of wavepackets experimentally remains challenging, but the gold trimer complex (GTC) offers insight into the dynamics of bond formation in solution. Bond making in the solution phase has been difficult to study due to limitations caused by diffusion, but GTC allows for the tracking of bimolecular reactions with an ultrafast time resolution.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Optics
Daria Kolbasova, Maximilian Hartmann, Rui Jin, Alexander Blaettermann, Christian Ott, Sang-Kil Son, Thomas Pfeifer, Robin Santra
Summary: This study investigates the application of attosecond transient absorption spectroscopy in characterizing inner-shell-excited systems. The experimental setup involves preparing wave packets with an attosecond XUV pulse and probing them with a femtosecond NIR pulse to study coherent electron dynamics in core-excited xenon atoms. The theoretical analysis shows that the additional influence of an NIR dressing field on the transient absorption spectrum is substantial, highlighting the importance of precise characterization of the NIR pulse for qualitative and quantitative comparisons with experimental results.
Article
Neurosciences
Wan-Chen Jiang, Shengjin Xu, Joshua T. Dudman
Summary: This study investigates the differential contributions of hippocampal activity to experience-dependent learning of trajectories across spatial and relational contexts. The results indicate that the synchronous reactivation of hippocampal activity plays different roles in the evaluation and initiation of trajectories in navigational and non-navigational contexts.
NATURE NEUROSCIENCE
(2022)
Article
Multidisciplinary Sciences
Pontus Svensson, Thomas Campbell, Frank Graziani, Zhandos Moldabekov, Ningyi Lyu, Victor S. Batista, Scott Richardson, Sam M. Vinko, Gianluca Gregori
Summary: An extension of the wave packet description of quantum plasmas is proposed, allowing for elongation in arbitrary directions. A generalized Ewald summation is used to account for long-range Coulomb interactions, while fermionic effects are approximated using purpose-built Pauli potentials. The numerical implementation shows good parallel support and close to linear scaling in particle number. Comparisons with the common wave packet model employing isotropic states reveal differences primarily in the electronic subsystem, particularly in the electrical conductivity of dense hydrogen.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Physics, Multidisciplinary
Zsolt Lecz, Alexander Andreev, Christos Kamperidis, Nasr Hafz
Summary: This research presents a compact and tunable scheme for providing clean and mono-energetic electron bunches with less than one percent energy spread and with central energy on the GeV level. The scheme involves ionization injection with attosecond pulses and acceleration in a capillary plasma wave-guide. Semi-analytical theory and particle-in-cell simulations are used to accurately model the injection and acceleration steps.
NEW JOURNAL OF PHYSICS
(2021)
Article
Astronomy & Astrophysics
Saurya Das, Sujoy K. Modak
Summary: This study improves upon previous research and explores the potential for testing these improvements in the laboratory. The results show that despite the presence of relativistic corrections, the previous claims remain intact and are strengthened.
CLASSICAL AND QUANTUM GRAVITY
(2022)
Article
Chemistry, Physical
Fernando Aguilar-Galindo, Andrey G. Borisov, Sergio Diaz-Tendero
Summary: The study focuses on ultrafast electron transfer between adsorbed organic molecules and metal substrates, particularly examining the dynamics of active electrons and decay of molecule-localized electronic resonances. It is found that the strong coupling with the metal substrate results in an extremely short lifetime of molecular resonance, influencing the anisotropy of metal continuum states and potentially impacting molecular self-assembly at metal surfaces.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Qiang Zhang, Danjun Liu, Qun Ren, Nicolae C. Panoiu, Li Lin, Jian Ye, Yang Huang, Shao-Ding Liu, Chi Wah Leung, Dangyuan Lei
Summary: The study investigates the plasmonic properties of gold CMS nanojunctions and the impact of electron transport on them using two-photon luminescence spectroscopy. The results suggest that the near-field response is more affected by electron transport than the far-field property, contributing to the understanding of charge transport mechanisms in molecular structures.
Article
Optics
K. B. Oganesyan, M. Hnatic, P. Kopchancky
Summary: This paper compares the quantum mechanical and classical approaches in free electron lasers and studies the initial distribution of electrons over vibrational levels in relativistic free electron lasers.
LASER PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Naoki Ichiji, Yuka Otake, Atsushi Kubo
Summary: The spatiotemporal dynamics of a surface plasmon polariton wave packet interacting with a plasmonic nanocavity on a metal surface are studied. It is found that only the spectral component matching a specific energy level can continue propagating on the metal surface, leading to a spatial peak shift in the wave packet.
Article
Physics, Multidisciplinary
Michael Moskalets
Summary: Expressing currents and fluctuations in a multi-probe conductor with carrier wave functions injected into Fermi sea provides new insights into electric current physics. In the quantum coherent regime, there are two physically distinct contributions to shot noise, cross-correlation noise and autocorrelation noise, determined by wave packet duration and coherence. In the weak back-scattering regime, autocorrelation noise depends solely on coherence, allowing separate analysis of the contributions.
Article
Materials Science, Multidisciplinary
Junbo Sun, Weichen Tang, Yufei Wang, Xupei Yao, Bo Huang, Mohamed Saafi, Xiangyu Wang
Summary: This study developed a new wave-shaped EMW absorbing superstructure using 3D cement printing, which showed significant improvement in mechanical properties and EMW absorption performance. The research used molecular dynamic simulation to investigate the mechanism of enhanced mechanical properties and analyzed the EMW absorption performance of printed specimens. The optimized design of the superstructure demonstrated average reflection loss of -25 dB, peak reflectivity of -37.4 dB, and an absorbing bandwidth of 17 GHz, indicating its great potential in minimizing electromagnetic contamination.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Physics, Applied
Jiaqi Sun, Yang Li, Yenal Karaaslan, Cem Sevik, Youping Chen
Summary: The structure and thermal boundary conductance of the wurtzite GaN/AlN (0001) interface were investigated through molecular dynamics simulation. Different empirical interatomic potentials resulted in similar misfit dislocation networks and core structures, with pure edge dislocations and an eight-atom ring structure being predominant. Despite variations in dislocation properties and thermal conductance values, all potentials showed a significant impact of misfit dislocations on the thermal boundary conductance of the GaN/AlN (0001) interface.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
A. Korobenko, P. Rosenberger, J. Schoetz, A. Yu Naumov, D. M. Villeneuve, M. F. Kling, A. Staudte, P. B. Corkum, B. Bergues
Summary: This novel approach offers a cost-effective and alignment-insensitive method for single-shot characterization of spectral phase of broadband laser pulses. It combines the simplicity and robustness of dispersion scan technique with the advantages of single-shot pulse characterization methods like single-shot frequency-resolved optical gating.
Article
Materials Science, Multidisciplinary
Deepak L. N. Kallepalli, Alan T. K. Godfrey, Jesse Ratte, Andre Staudte, Chunmei Zhang, P. B. Corkum
Summary: The study found that using ultrafast laser pulses in a back-illumination geometry could decrease the surface wettability of polymer films while keeping the surface chemistry intact. Various methods were used to confirm this hypothesis, resulting in the discovery that back-illuminated surfaces showed increased hydrophobicity, which was different from the combined chemical and morphological changes caused by a front-illumination geometry.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Optics
A. Korobenko, S. Rashid, C. Heide, A. Yu Naumov, D. A. Reis, P. Berini, P. B. Corkum, G. Vampa
Summary: Short wavelength high-harmonic sources are undergoing intense development for applications in spectroscopy and microscopy. Spatial control over coherent extreme ultraviolet (XUV) beams remains a challenge, but a new approach using nanostructured MgO crystal shows potential for applications in shaped light beams. This demonstration paves the way for bridging applications of shaped light beams from visible to short wavelengths, with uses in microscopy and nanoscale machining.
Article
Optics
Peng Peng, Yonghao Mi, Marianna Lytova, Mathew Britton, Xiaoyan Ding, A. Yu. Naumov, P. B. Corkum, D. M. Villeneuve
Summary: By generating quantum coherence in the ground electronic state of hydrogen molecules, we are able to control the absorption spectrum, making it negative at 12 eV, which is the optical gain. These findings offer new insights into controlling spectral lineshapes and pave the way for achieving lasing without inversion in the XUV spectral range.
Article
Optics
Yonghao Mi, Kyle Johnston, Valentina Shumakova, Soren H. Moller, Kamalesh Jana, Chunmei Zhang, Andre Staudte, Shawn Sederberg, Paul B. Corkum
Summary: Intense laser fields focused in ambient air can generate high-bandwidth current densities, with the amplitude and sign of these currents controlled by adjusting the relative phase. Two-color filamentation in gas targets allows for increasing the energy of terahertz pulses. However, controlling the waveform stability is challenging. By comparing current density detection and terahertz field detection, a clear connection between phase-dependent plasma currents and terahertz radiation is established. Current measurement can be used as a feedback parameter to stabilize the terahertz waveform, providing a route to energetic terahertz pulses with exceptional waveform stability.
PHOTONICS RESEARCH
(2022)
Article
Optics
Ziyue Guo, Kailin Hu, Tao Cao, Shaozhen Liu, Jikun Yan, Zhou Li, Qi Xu, Paul B. Corkum, Jiahui Peng
Summary: This paper reports incubation experiments on ultrashort laser energy deposition and material modification control in dielectrics. A practical incubation model is developed by considering different ionization mechanisms, and a pre-pulse scheme is proposed to limit the absorption volume.
Article
Optics
Johannes Bloechl, Johannes Schoetz, Ancyline Maliakkal, Natalija Sreibere, Zilong Wang, Philipp Rosenberger, Peter Hommelhoff, Andre Staudte, Paul B. Corkum, Boris Bergues, Matthias F. Kling
Summary: In this study, we introduce a method for sampling the optical field by utilizing the enhanced near-field of a nanometric needle tip. This method provides reliable characterization of the spatial distribution and temporal evolution of visible light fields, as well as the resolution of the wavefront and orbital angular momentum of light pulses. The method is also polarization sensitive and applicable to vectorial field reconstruction.
Article
Optics
L. Arias, A. Longa, G. Jargot, A. Pomerleau, P. Lassonde, G. Fan, R. Safaei, P. B. Corkum, F. Boschini, H. Ibrahim, F. Legare
Summary: In this study, ultrashort pulse compression from 300 fs to 17 fs was achieved using multidimensional solitary states (MDSS) in a 1-meter hollow-core fiber (HCF) filled with N2O. The thermal limitations at this repetition rate were mitigated by using a differential pressure configuration, resulting in increased range of repetition rate for MDSS-based compression of sub-picosecond laser pulses.
Article
Optics
Sohail A. Jalil, Kashif M. Awan, Idriss A. Ali, Sabaa Rashid, Joshua Baxter, Aleksey Korobenko, Guilmot Ernotte, Andrei Naumov, David M. Villeneuve, Andrg Staudte, Pierre Berini, Lora Ramunno, Giulio Vampa
Summary: This study demonstrates the polarization and phase control of high harmonics using a plasmonic metasurface. By designing and fabricating gold antennas on a silicon crystal, circularly polarized deep-ultraviolet high harmonics were generated from a circularly polarized infrared driver. Our metasurface enhances the circularly polarized harmonics up to approximately 43 times compared to the unpatterned surface.
Article
Optics
Takashi Nakajima, Tasuku Shinoda, D. M. Villeneuve, Hiromichi Niikura
Summary: This study demonstrates the full mapping of the complex wave function of photoelectrons in two-dimensional momentum space using the interference between different optical transition pathways. The detailed structure of the phase and amplitude distributions of photoelectrons can be resolved within the bandwidth determined by the attosecond XUV pulse.
Article
Optics
T. Wang, Z. Dube, Y. Mi, G. Vampa, D. M. Villeneuve, P. B. Corkum, Xiaojun Liu, A. Staudte
Summary: In this study, the semiclassical two-step model is used to investigate subcycle interference structures in the photoelectron momentum distribution. The low-momentum region is found to be particularly sensitive to the ion potential, offering another pathway to probe ultrafast electronic structure dynamics.
Article
Optics
Graham G. Brown, Dong Hyuk Ko, Chunmei Zhang, P. B. Corkum
Summary: This study investigates the influence of transition-moment phase on recollision trajectories and uses a model to study all-optical measurements in argon and diatomic molecular systems. The results show that all-optical methods are generally sensitive to the transition-moment phase, but insensitive to the phase shifts caused by two-center interference and ionic structure.
Proceedings Paper
Engineering, Electrical & Electronic
Peng Peng, Yonghao Mi, Marianna Lytova, Mathew Britton, Xiaoyan Ding, A. Yu Naumov, P. B. Corkum, D. M. Villeneuve
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC)
(2021)
Article
Optics
D. M. Villeneuve, Peng Peng, Hiromichi Niikura
Summary: Development of attosecond laser technology has enabled measurement of electron dynamics like photoionization delays between different species or electronic states. By analyzing photoelectron angular distributions, researchers were able to determine the relative amplitudes and phases of each angular momentum component. Through the use of an XUV pulse train, they successfully separated the spectral phase of the XUV pulse and the atomic phases inherent to the optical transitions, reconstructing continuum wave functions associated with three individual photoionization pathways.
