A5086103859- Terahertz technology and applications
- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Spectroscopy and Quantum Chemical Studies
- Orbital Angular Momentum in Optics
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Advanced Optical Sensing Technologies
- Gold and Silver Nanoparticles Synthesis and Applications
- Mass Spectrometry Techniques and Applications
- Semiconductor Quantum Structures and Devices
Ludwig-Maximilians-Universität München
2021-2025
Max Planck Institute of Quantum Optics
2021-2025
Measuring the field of visible light with high spatial resolution has been challenging, as many established methods only detect a focus-averaged signal. Here, we introduce near-field method for optical sampling that overcomes limitation by employing localization enhanced nanometric needle tip. A probe perturbs photoemission from tip, which is induced pump pulse, generating field-dependent current modulation can easily be captured our electronic detection scheme. The approach provides...
The response of metal nanostructures to optical excitation leads localized surface plasmon (LSP) generation with nanoscale field confinement driving applications in, for example, quantum optics and nanophotonics. Field sampling in the terahertz domain has had a tremendous impact on ability trace such collective excitations. Here, we extend capabilities introduce direct LSPs more relevant petahertz domain. method allows measure LSP arbitrary subcycle precision. We demonstrate technique...
The carrier-envelope phase (CEP) is a key parameter for attosecond waveform control of ultrashort laser pulses. For systems with high repetition rates, however, single-shot CEP detection still challenging. Building on recent findings electric current generation in gases, we show that an optimized method, long-term stable feasible. We investigate the achievable performance depending various parameters such as pulse duration, gas pressure, or incident intensity. latter exhibits regime where...
Abstract Strong-field photoemission from nanostructures and the associated temporally modulated currents play a key role in development of ultrafast vacuum optoelectronics. Optical light fields could push their operation bandwidth into petahertz domain. A critical aspect functionality context applications is impact charge interaction effects. Here, we investigated photocurrents nanometric tungsten needle tips exposed to carrier-envelope phase (CEP)-controlled few-cycle laser fields. We...
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%...
Photoconductive field sampling is a key methodology for advancing our understanding of light-matter interaction and ultrafast optoelectronic applications. For visible light the bandwidth photoconductive fields field-induced dynamics can be extended to petahertz domain. Despite growing importance measurements, rigorous model connecting microscopic electron macroscopic external signal lacking. This has caused conflicting interpretations about origin currents. Here, we present systematic...
We describe the emergence of macroscopic currents in photoconductive field sampling and implemented spatio-temporal near-petahertz fields, enabling full vectorial characterization light beams with orbital angular momentum.
We demonstrate a carrier-envelope-phase-stable mid-infrared optical parametric amplifier, delivering 20fs pulses at 3.5 mJ energy. Its excellent stability and high repetition rate make it an outstanding frontend for flux, soft x-ray attosecond spectroscopy.
Plasmon excitation in nanosystems allows for extreme light confinement beyond the diffraction limit, therefore enabling a number of new applications photonics, energy harvesting and biology. In this context, it is key to obtain realtime characterization onset from plasmonic field its ultrafast dephasing dynamics.
The collective response of metal nanostructures to optical excitation leads localized plasmon generation with nanoscale field confinement driving applications in e.g. quantum optics, optoelectronics, and nanophotonics, where a bottleneck is the ultrafast loss coherence by different damping channels. present understanding built-up on indirect measurements dictated extreme timescales involved. Here, we introduce straightforward sampling method that allows measure plasmonic arbitrary most...
Measuring the field of visible light with high spatial resolution has been challenging, as many established methods only detect a focus-averaged signal. Here, we introduce near-field method for optical sampling that overcomes limitation by employing localization enhanced nanometric needle tip. A probe perturbs photoemission from tip, which is induced pump pulse, generating field-dependent current modulation can easily be captured our electronic detection scheme. The approach provides...
Strong-field photoemission from nanostructures and the associated temporally modulated currents play a key role in development of ultrafast vacuum optoelectronics. Optical light fields could push their operation bandwidth into petahertz domain. A critical aspect for functionality context applications is charge interactions, including space effects. Here, we investigated photocurrents nanometric tungsten needle tips exposed to carrier-envelope phase-controlled few-cycle laser fields. We...