A5044415397- Laser-Matter Interactions and Applications
- Laser-induced spectroscopy and plasma
- Ion-surface interactions and analysis
- Mass Spectrometry Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Non-Invasive Vital Sign Monitoring
- Advanced Electron Microscopy Techniques and Applications
- Advanced Chemical Physics Studies
- COVID-19 diagnosis using AI
- Spectroscopy and Quantum Chemical Studies
- Atomic and Molecular Physics
- Gold and Silver Nanoparticles Synthesis and Applications
- Nonlinear Optical Materials Studies
- IoT and Edge/Fog Computing
- Advanced Fiber Laser Technologies
- Plasmonic and Surface Plasmon Research
- Fullerene Chemistry and Applications
- Electron and X-Ray Spectroscopy Techniques
- Healthcare Technology and Patient Monitoring
- Quantum, superfluid, helium dynamics
- Advanced Fluorescence Microscopy Techniques
- Vehicle Noise and Vibration Control
- Vestibular and auditory disorders
- Photoacoustic and Ultrasonic Imaging
- High-pressure geophysics and materials
Ludwig-Maximilians-Universität München
2015-2025
Max Planck Institute of Quantum Optics
2016-2025
Brigham and Women's Hospital
2021-2024
Harvard University
2021-2024
Kempten University of Applied Sciences
2023
ETH Zurich
2020-2021
University of Stuttgart
2019
The COVID-19 pandemic has accelerated methods to facilitate contactless evaluation of patients in hospital settings. By minimizing in-person contact with individuals who may have COVID-19, healthcare workers can prevent disease transmission and conserve personal protective equipment. Obtaining vital signs is a ubiquitous task that commonly done person by workers. To eliminate the need for sign measurement setting, we developed Dr. Spot, mobile quadruped robotic system. system includes IR RGB...
Abstract Near-fields of non-resonantly laser-excited nanostructures enable strong localization ultrashort light fields and have opened novel routes to fundamentally modify control electronic strong-field processes. Harnessing spatiotemporally tunable near-fields for the steering sub-cycle electron dynamics may ultrafast optoelectronic devices unprecedented in generation attosecond photon pulses. Here we utilize unsupported sub-wavelength dielectric nanospheres generate with adjustable...
The Johnson–Cook constitutive equation is very widely used for simulating cutting processes. Different methods are applied establishing parameters of the equation. Based on analysed in this study, two algorithms were worked out to determine prevailing conditions during In first algorithm, all established simultaneously with standardized test methods. second separately accordance machining developed methodology was verified AISI 1045 heat-treatable steel and Ti10V2Fe3Al (Ti-1023) titanium...
Extreme light confinement in plasmonic nanosystems enables novel applications photonics, sensor technology, energy harvesting, biology, and quantum information processing. Fullerenes represent an extreme case for nanoplasmonics: They are subnanometer carbon-based molecules showing high-energy ultrabroad plasmon resonances; however, the fundamental mechanisms driving response corresponding collective electron dynamics still elusive. Here, we uncover dominant role of correlations giant...
The free expansion of a planar plasma surface is fundamental non-equilibrium process relevant for various fields but as-yet experimentally still difficult to capture. significance the associated spatiotemporal motion ranges from astrophysics and controlled fusion laser machining, high-harmonic generation, mirrors, laser-particle acceleration. Here, we show that x-ray coherent diffractive imaging can surpass existing approaches enables quantitative real-time analysis sudden nanoplasmas. For...
Nanostructures exposed to ultrashort waveform-controlled laser pulses enable the generation of enhanced and highly localized near fields with adjustable local electric field evolution. Here, we study dielectric SiO2 nanospheres (d = 100–700 nm) under strong carrier-envelope phase-controlled few-cycle perform a systematic theoretical analysis resulting near-field driven photoemission. In particular, analyze impacts charge interaction ellipticity on electron acceleration. Our semiclassical...
Theoretical studies indicated that C_{60} exposed to linearly polarized intense infrared pulses undergoes periodic cage structural distortions with typical periods around 100 fs (1 fs=10^{-15} s). Here, we use the laser-driven self-imaging electron diffraction technique, previously developed for atoms and small molecules, measure laser-induced deformation of in an 3.6 μm laser field. A prolate molecular elongation along polarization axis is determined be (6.1±1.4)% via both angular-...
We study strong-field ionization of dielectric nanospheres and focus on the enhancement cut-off energies for backscattering electrons resulting from charge interaction. Though recent studies clearly demonstrated decisive impact a surface trapping field electron process, clear picture underlying mechanism is lacking. Here, we provide this present simple transparent extension famous three-step model science by adding triangular potential. justify case based high-level transport simulations....
Abstract Nanoparticles offer unique properties as photocatalysts with large surface areas. Under irradiation light, the associated near-fields can induce, enhance, and control molecular adsorbate reactions on nanoscale. So far, however, there is no simple method available to spatially resolve near-field induced reaction yield of nanoparticles. Here we close this gap by introducing nanoscopy based three-dimensional momentum-resolved photoionization. The technique demonstrated for selective...
Abstract Regarded as the most important ion in interstellar chemistry, trihydrogen cation, $${{\rm{H}}}_{{{3}}}^{+}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mrow> <mml:mi>H</mml:mi> </mml:mrow> <mml:mn>3</mml:mn> <mml:mo>+</mml:mo> </mml:msubsup> </mml:math> , plays a vital role formation of water and many complex organic molecules believed to be responsible for life our universe. Apart from traditional plasma discharges, recent laboratory studies have...
Ultrafast light-induced molecular reactions on aerosolized nanoparticles may elucidate early steps in the photoactivity of with potential impact fields ranging from chemistry and medicine to climate science. In situ morphology discrimination for nanoparticle streams when measuring reaction yields is crucial, but lacking. Here, we experimentally demonstrate, using nanoscopy technique, that proton momenta deprotonation induced by intense femtosecond pulses exhibit clear, distinguishable...
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We present the results of a systematic study photoelectron emission from gasphase dielectric nanoparticles (SiO2) irradiated by intense 25 fs, 780 nm linearly polarized laser pulses as function particle size (20 to 750 in diameter) and intensity. also introduce an experimental technique reduce effects focal volume averaging. The highest energies show strong dependence, increasing factor six over range particles sizes studied at fixed For smaller (up 200 nm), our findings agree well with...
The trade-off between spatial and temporal resolution remains a fundamental challenge in machine vision. A captured image often contains significant amount of redundant information, only small region interest (ROI) is necessary for object detection tracking. In this paper, we first systematically characterize the effects ROI on camera capturing, data transmission, processing. We then present closed-loop algorithm capable high as well wide scanning field view (FOV) single multi-object...
The development of attosecond metrology has enabled time-resolved studies on atoms, molecules, and (nanostructured) solids. Despite a wealth theoretical work, experiments isolated nanotargets, such as nanoparticles, clusters, droplets have been lacking. Only recently, streaking could be extended to silica nanospheres, enabling real-time measurements the inelastic scattering time in dielectric materials. Here, we revisit these describe single-shot analysis velocity-map images, which permits...
Accurate multiclass classification of electroencephalography (EEG) signals is still a challenging task towards the development reliable motor imagery brain-computer interfaces (MI-BCIs). Deep learning algorithms have been recently used in this area to deliver compact and accurate model. Reaching high-level accuracy requires store subjects-specific trained models that cannot be achieved with an otherwise model globally across all subjects. In paper, we propose new methodology closes gap...
Abstract Field localization by nanostructures illuminated with laser pulses of well-defined waveform enables spatio-temporal tailoring the near-fields for sub-cycle control electron dynamics at nanoscale. Here, we apply intense linearly-polarized two-color all-optical highest energy emission from SiO 2 nanoparticles. For size regime where light propagation effects become important, demonstrate possibility to preferential angle a considerable fraction fastest electrons varying relative phase...
Utilization of the plasmonic response in nanosystems is a key component nanophotonics that typically altered by varying incident optical frequency or material configuration. However, this work we demonstrate employing intense, femtosecond laser fields unlock nonlinear light–matter interactions such precise control achieved solely adjusting intensity. The properties Au/SiO2 nanoshells are manipulated exploiting index refraction gold and experimentally observed photoelectrons emitted during...
The low-energy photoelectron spectra from strong-field ionization of ${\mathrm{C}}_{60}$ fullerenes and noble gases (xenon krypton) with $3\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{m}$ laser pulses are measured compared. It is found that the structure (LES), a universal spikelike feature in limit atoms small molecules, significantly suppressed distribution. We propose large polarizability core disrupts corresponding electron trajectories. In particular, induced dipole force repels...
Abstract Detailed knowledge about photo-induced electron dynamics in water is key to the understanding of several biological and chemical mechanisms, particular for those resulting from ionizing radiation. Here we report a method obtain photoelectron spectra neutral clusters following ionization by an extreme-ultraviolet (XUV) attosecond pulse train, representing first step towards time-resolved analysis. Typically, large background signal experiment arises monomers carrier gas used cluster...
<p>The Covid-19 Pandemic has renewed interest in contactless vital signs monitoring using state-of-the-art computer vision, which can efficiently screen for symptoms while reducing the risk of disease transmission. Despite promising perfor- mance, use static camera setups requires subjects to remain inside a field view (FoV) pre-specified duration. Due inconsistent ambient environmental conditions, transit individuals through FoV, and time it may take triage individuals, widespread...
We investigated the attosecond electronic collisional dynamics in a dielectric nanomaterial, which are of primary importance to fully understand transport properties future dielectric-electronic devices with up petahertz switching speeds.