A5001069974- Spectroscopy and Quantum Chemical Studies
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Mass Spectrometry Techniques and Applications
- Terahertz technology and applications
- Advanced Electron Microscopy Techniques and Applications
- Advanced Fluorescence Microscopy Techniques
- Advanced Chemical Physics Studies
- Topological Materials and Phenomena
- Semiconductor Quantum Structures and Devices
- Surface and Thin Film Phenomena
- Photoreceptor and optogenetics research
- Spectroscopy and Laser Applications
- Cold Atom Physics and Bose-Einstein Condensates
- 2D Materials and Applications
- Graphene research and applications
- Ion-surface interactions and analysis
- Photochemistry and Electron Transfer Studies
- Inorganic Chemistry and Materials
- Random lasers and scattering media
- Mechanical and Optical Resonators
- Gold and Silver Nanoparticles Synthesis and Applications
- nanoparticles nucleation surface interactions
- Copper-based nanomaterials and applications
- Nonlinear Optical Materials Studies
Max Planck Institute of Quantum Optics
2016-2024
Ludwig-Maximilians-Universität München
2017-2024
Abstract In recent years, the stacking and twisting of atom-thin structures with matching crystal symmetry has provided a unique way to create new superlattice in which properties emerge 1,2 . parallel, control over temporal characteristics strong light fields allowed researchers manipulate coherent electron transport such on sublaser-cycle timescales 3,4 Here we demonstrate tailored light-wave-driven analogue twisted layer stacking. Tailoring spatial waveform that lattice hexagonal boron...
We developed a high repetition rate optical parametric chirped-pulse amplification (OPCPA) laser system based on fiber-laser-seeded Innoslab to generate few-cycle pulses around 2 µm with passively stable carrier-envelope phase (CEP) by difference frequency generation (DFG).Incorporating piezo mirror before the DFG stage permits rapid CEP control.The OPCPA is seeded supercontinuum generated in bulk material picosecond pulses.Few-cycle durations of 17 fs and energies over 100 μJ were produced...
Altermagnetism has surfaced as a novel magnetic phase, bridging the properties of ferro- and anti-ferromagnetism. The momentum-dependent spin-splitting observed in these materials reflects their unique symmetry characteristics which also establish conditions for chiral magnons to emerge. Here we provide first direct experimental evidence magnon altermagnetic candidate MnTe, revealed by circular-dichroism resonant inelastic X-ray scattering (CD-RIXS). This mode term altermagnon exhibits...
We demonstrate a mid-infrared optical parametric chirped pulse amplifier (OPCPA), delivering 2.1 µm center wavelength pulses with 20 fs duration and 4.9 mJ energy at 10 kHz repetition rate. This self-seeded system is based on kW-class Yb:YAG thin-disk driving CEP stable short-wavelength-infrared (SWIR) generation three consecutive OPCPA stages. Our SWIR source achieves an average power of 49 W, while still maintaining excellent phase stability sub-100 mrad carrier-envelope-phase-noise 0.8%...
Transient near fields around metallic nanotips drive many applications, including the generation of ultrafast electron pulses and their use in microscopy. We have investigated emission from a gold nanotip driven by midinfrared few-cycle laser pulses. identify low-energy peak kinetic energy spectrum study its shift to higher energies with increasing intensities 1.7 $8.9\ifmmode\times\else\texttimes\fi{}{10}^{11}\phantom{\rule{0.28em}{0ex}}\mathrm{W}/{\mathrm{cm}}^{2}$. The experimental...
Molecular adsorbate reactions on nanoparticles play a fundamental role in areas such as nano-photocatalysis, atmospheric, and astrochemistry. They can be induced, enhanced, controlled by field localization enhancement the nanoparticle surface. In particular, ability to perform highly near-field-mediated is key deepening our understanding of surface photoactivity nanosystems. Here, using reaction nanoscopy, we experimentally demonstrate all-optical nanoscopic control yields tailoring near...
Abstract Nonlinear optical properties of organic semiconductors (OSCs) have been extensively investigated in the perturbative regime, while strong light induced high‐order processes solid‐state OSCs are less studied. Here, below‐threshold harmonic generation is examined, both experimentally and theoretically, two thin film OSCs, that is, tetraphenylporphyrin zinc tetraphenylporphyrin. Results show π–π* excitations porphyrin ring system generate emission. The contribution Brunel to 5th...
Abstract Tracing the dynamical behavior of light-induced surface charges on nanostructures is pivotal for elucidating fundamental processes governing catalysis and light-nanomaterial interactions. Extension to nanoscale charge dynamics, however, remained challenging due involved length time scales. Here, we demonstrate direct observation dynamics dielectric nanoparticles under strong-field irradiation using time-resolved reaction nanoscopy. Our technique offers four-dimensional visualization...
Surface charges play a fundamental role in physics and chemistry, particular shaping the catalytic properties of nanomaterials. However, tracking nanoscale surface charge dynamics remains challenging due to involved length time scales. Here, we demonstrate time-resolved access on dielectric nanoparticles using reaction nanoscopy. We present four-dimensional visualization spatiotemporal evolution density individual SiO 2 under strong-field irradiation with femtosecond-nanometer resolution....
The ability to measure and control the carrier envelope phase (CEP) of few-cycle laser pulses is paramount importance for both frequency metrology attosecond science. Here, we present a meter relying on CEP-dependent photocurrents induced by circularly polarized focused between electrodes in ambient air. new device facilitates compact single-shot, CEP measurements under conditions promises tagging at repetition rates orders magnitude higher than most conventional detection schemes as well...
We investigate the strong-field ion emission from surface of isolated silica nanoparticles aerosolized an alcoholic solution, and demonstrate applicability recently reported near-field imaging at 720 nm [Rupp et al., Nat. Comm., 10(1):4655, 2019] to longer wavelength (2 μ m) polarizations with arbitrary ellipticity. Based on experimental observations, we discuss validity a previously introduced semi-classical model, which is based driven charge generation by Monte-Carlo approach classical...
A simple and easy to implement technique for femtosecond pulse characterization is proposed experimentally verified. It based on the introduction of a known amount dispersion (by controlling number passes through dispersive material) subsequent recording spectral positions second harmonic peaks obtained in non-linear crystal. Such dependence allows direct retrieval phase. The presented method beneficial especially broadband pulses, where spectrum exceeds detection bandwidth single spectrometer.
Abstract In recent years, the stacking and twisting of atom-thin structures with matching crystal symmetry has provided a unique handle to create new superlattice where properties emerge 1,2 . parallel, control over temporal characteristics strong light fields allowed manipulate coherent electron transport in such on sub-laser-cycle timescales 3,4 Here, we demonstrate tailored lightwave-driven analogue twisted layer stacking. Tailoring spatial waveform that lattice hexagonal boron nitride...
The fifth-order optical nonlinearity of Tris-(8-hydroxyquinoline) aluminium (Alq3) thin films deposited on quartz substrates when exposed to an intense laser excitation mid-infrared femtosecond pulses is investigated. This property was examined by generating the fifth-harmonic frequency driving field whose signal strength as a function intensity well described power-law scaling. perturbative nature underlying mechanism enabled linking process directly nonlinear susceptibility χ(5). We also...
We demonstrate an efficient hybrid-scheme for nonlinear pulse compression of high-power thin-disk oscillator pulses to the sub-10 fs regime. The output a home-built, 16 MHz, 84 W, 220 Yb:YAG at 1030 nm is first compressed 17 in two multipass cells. In third stage, based on multiple thin sapphire plates, further 8.5 with 55 W power and overall optical efficiency 65% achieved. Ultrabroadband mid-infrared covering spectral range 2.4-8µm were generated from these by intra-pulse difference...
Surface charges play a fundamental role in physics and chemistry, particularly shaping the catalytic properties of nanomaterials. Tracking nanoscale surface charge dynamics remains challenging due to involved length time scales. Here, we demonstrate real-time access on dielectric nanoparticles employing reaction nanoscopy. We present four-dimensional visualization non-linear strong-field irradiated single SiO$_2$ with femtosecond-nanometer resolution reveal how affect molecular bonding...
We report on nonlinear compression of 2.5-μm, sub-100 fs laser pulses using a noble-gas-filled hollow core fiber. MgF 2 wedges are used to compress the pulse and perform dispersion-scan. Sub-3-cycle, 1.8-mJ obtained after compression.
Droplets provide unique opportunities for the investigation of laser-induced surface chemistry. Chemical reactions on charged droplets are ubiquitous in nature and can critical insight into more efficient processes industrial chemical production. Here, we demonstrate application reaction nanoscopy technique to strong-field ionized nanodroplets propanediol (PDO). The technique's sensitivity near-field around droplet allows in-situ characterization average size charge. use ultrashort laser...
Transient field-resolved spectroscopy enables studies of ultrafast dynamics in molecules, nanostructures, or solids with sub-cycle resolution, but previous work has so far concentrated on extracting the dielectric response at frequencies below 50 THz. Here, we implemented transient reflectometry 50–100 THz (3–6 µm) MHz repetition rate employing 800 nm few-cycle excitation pulses that provide sub-10 fs temporal resolution. The capabilities technique are demonstrated photorefractive changes...
Stacking and twisting atom-thin sheets create superlattice structures with unique emergent properties, while tailored light fields can manipulate coherent electron transport on ultrafast timescales. The unification of these two approaches may lead to creation manipulation band structure which is a crucial objective for the advancement quantum technology. Here, we address this by demonstrating lightwave-driven analogue twisted layer stacking. This results in sub-femtosecond control...
In article number 2203070, Weiwei Li, Zilong Wang, and co-workers present a study on Brunel harmonic generation in thin-film organic semiconductors exposed to intense ultrashort laser excitation. The authors find that resonant transitions induced by low-energy photons can substantially change the nonlinear behavior of materials manifesting as an early onset non-perturbative generation. image emitted harmonics from semiconducting molecules are represented both waves particles. Illustration:...
Intense laser fields with controlled waveform are an important tool in strong-field and attosecond physics. Mid-inirared systems based on difference frequency generation (DFG) provide passively carrier-envelope phase (CEP) stable femtosecond pulses [1]. As Mid-IR is inherently inefficient, optical parametric amplification (OPA) DFG either limited by the peak power [2] or repetition rate [3].