A5044584472- Particle Accelerators and Free-Electron Lasers
- Near-Field Optical Microscopy
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Spectroscopy Techniques in Biomedical and Chemical Research
- Calibration and Measurement Techniques
- Terahertz technology and applications
- Advancements in Photolithography Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Photonic and Optical Devices
- Particle accelerators and beam dynamics
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum Dots Synthesis And Properties
- Electron and X-Ray Spectroscopy Techniques
- Plasmonic and Surface Plasmon Research
- Spectroscopy and Laser Applications
- Physics of Superconductivity and Magnetism
- Photoacoustic and Ultrasonic Imaging
- Scientific Measurement and Uncertainty Evaluation
- Superconducting and THz Device Technology
- Magnetic properties of thin films
- Force Microscopy Techniques and Applications
- Optical Imaging and Spectroscopy Techniques
- Thermography and Photoacoustic Techniques
Physikalisch-Technische Bundesanstalt
2013-2024
Polish Botanical Society
2023
Technische Universität Berlin
2016
Helmholtz-Zentrum Berlin für Materialien und Energie
2010
University of Electro-Communications
2004
We have developed different types of photodetectors that are based on the photoionization a gas at low target density. The almost transparent devices were optimized and tested for online photon diagnostics current future x-ray free-electron laser facilities shot-to-shot basis with temporal resolution better than 100 ns. Characterization calibration measurements performed in laboratory Physikalisch-Technische Bundesanstalt electron storage ring BESSY II Berlin. As result, measurement...
Quasi-one-dimensional (quasi-1D) materials enjoy growing interest due to their unusual physical properties and promise for miniature electronic devices. However, the mechanical exfoliation of quasi-1D into thin flakes nanoribbons received considerably less attention from researchers than conventional layered crystals. In this study, we investigated micromechanical representative crystals, TiS3 whiskers, demonstrate that they typically split narrow with very smooth, straight edges clear...
We demonstrate scanning near-field optical microscopy with a spatial resolution below 100 nm by using low intensity broadband synchrotron radiation in the IR regime. The use of such source opens up possibility to perform nano-Fourier-transform infrared spectroscopy over wide spectral range.
The Metrology Light Source is a recently constructed 630 MeV electron storage ring, operating as synchrotron radiation source for the THz to extreme UV spectral range. It first ring optimized generating intense, broadband, coherent radiation, based on bunch shortening mode. Stable (``steady state'') or bursting up an average power of about 60 mW can be obtained. applied machine operation mode achieved by manipulating momentum compaction factor $\ensuremath{\alpha}$ novel tuning scheme....
We describe the application of scattering-type near-field optical microscopy to characterize various semiconducting materials using electron storage ring Metrology Light Source (MLS) as a broadband synchrotron radiation source.For verifying high-resolution imaging and nano-FTIR spectroscopy we performed scans across nanoscale Si-based surface structures.The obtained results demonstrate that spatial resolution below 40 nm can be achieved, despite use source with an extremely broad emission...
The Metrology Light Source (MLS), the new electron storage ring of Physikalisch-Technische Bundesanstalt (PTB) located in Berlin, is dedicated to metrology and technological developments UV extreme spectral range as well IR THz region. MLS can be operated at any beam energy between 105 630 MeV currents varying from 1 pA (one stored electron) up 200 mA. Moreover, it optimized for generation coherent synchrotron radiation far IR/THz range. Of special interest PTB operation a primary source...
Antiferromagnets offer spintronic device characteristics unparalleled in ferromagnets owing to their lack of stray fields, THz spin dynamics, and rich materials landscape. Microscopic imaging antiferromagnetic domains is one the key prerequisites for understanding physical principles operation. However, adapting common magnetometry techniques dipolar-field-free antiferromagnets has been a major challenge. Here we demonstrate collinear antiferromagnet thermoelectric detection method by...
Nanoscale plasmonic phenomena observed in single and bilayers of molybdenum disulfide (MoS 2 ) on silicon dioxide (SiO are reported.A scattering type scanning near-field optical microscope (s-SNOM) with a broadband synchrotron radiation (SR) infrared source was used.We also present complementary mapping using tunable CO 2laser radiation.Specifically, there is correlation the topography welldefined MoS islands grown by chemical vapor deposition, as determined atomic force microscopy, (IR)...
Scattering-type scanning near-field optical microscopy (s-SNOM) enables sub-diffraction spectroscopy, featuring high sensitivity to small spatial permittivity variations of the sample surface. However, due complexity probe-sample interaction, quantitative extraction complex leads a computationally demanding inverse problem, requiring further approximation system an invertible model. Black-box calibration methods, similar those applied microwave vector network analyzers, allow without...
A main challenge in understanding the structure of a cell membrane and its interactions with drugs is ability to chemically study different molecular species on nanoscale. We have achieved this for model system consisting mixed monolayers (MLs) biologically relevant phospholipid 1,2-distearoyl-sn-glycero-phosphatidylcholine antibiotic surfactin. By employing nano-infrared (IR) microscopy spectroscopy combination atomic force imaging, it was possible identify detect domain formation two...
Synchrotron radiation-based nano-FTIR spectroscopy utilizes the highly brilliant and ultra-broadband infrared (IR) radiation provided by electron storage rings for spectroscopic characterization of samples at nanoscale. In order to exploit full potential this approach we investigated influence properties source, such as bunch shape spectral bandwidth emitted radiation, on near-field spectra silicon-carbide (SiC). The adapted configuration ring optics enables a modification transverse profile...
Infrared scattering scanning near-field optical microscopy (IR s-SNOM) provides for spectroscopic imaging with nanometer spatial resolution, yet full spatio-spectral is constrained by long measurement times.Here, we demonstrate the application of compressed sensing algorithms to achieve hyperspectral FTIR-based nano-imaging at an order magnitude faster speed same spectral content compared conventional approaches.At example spectroscopy a single vibrational resonance, discuss relationship...
The photoresponse of YBa${}_{2}$Cu${}_{3}$O${}_{7\ensuremath{-}\ensuremath{\delta}}$ thin film microbridges with thicknesses between 15 and 50 nm was studied in the optical terahertz frequency range. voltage transients response to short radiation pulses were recorded real time a resolution few tens picoseconds. bridges excited by either femtosecond at wavelength 0.8 \ensuremath{\mu}m or broadband (0.1--1.5 THz) picosecond coherent synchrotron radiation. are qualitatively well explained...
Thin YBa2Cu3O7−δ (YBCO) film detectors embedded into a log-spiral planar antenna were implemented for the detection and analysis of ultrashort terahertz pulses emitted by electron bunches in synchrotron storage ring. In direct mode radiation from single resolved. A response time 45 ps was determined as full width at half maximum voltage transient output system. The sensitivity YBCO detector to pulsed 70 mV/pJ along with 30 V/W continuous 0.8 THz very broad dynamic range over dB. We found...
A method has been developed and applied to measure the beam waist spot size of a focused soft x-ray at free-electron laser FLASH Deutsches Elektronen-Synchrotron in Hamburg. The is based on saturation effect upon atomic photoionization represents an indestructible tool for characterization powerful beams ionizing electromagnetic radiation. At microfocus beamline BL2 FLASH, full width half maximum focus diameter (15±2)μm was determined.
The Metrology Light Source (MLS)—the dedicated electron storage ring of the Physikalisch-Technische Bundesanstalt (PTB), designed for metrology and technological applications in spectral range from far IR to VUV—started user operation April 2008. MLS is used as a primary source standard NIR VUV region therefore equipped with all instrumentation necessary measure low uncertainty parameters geometrical needed calculation photon flux according Schwinger theory. It can be operated at any beam...
Abstract In the family of functional oxide materials, interface between LaAlO 3 and SrTiO (LAO/STO) is an interesting example, as both materials are large‐bandgap insulators in their bulk state but give rise to a confined 2D electron gas (2DEG) when combined through thin‐film deposition. While this 2DEG exhibits remarkable properties, its experimental investigation mostly limited destructive or non‐local (i.e. averaging over larger areas) methods until recently. Scanning near‐field optical...
This paper reports the observation of beam energy widening and distortion from Gaussian due to a nonvanishing horizontal chromaticity at quasi-isochronous storage ring. The result originates an average path-length dependence on betatron oscillation amplitudes, which is intimately correlated transverse chromaticities. It first experimental validation impact such nonlinear transverse-longitudinal coupling effect equilibrium characteristics in results could be important for rings, steady-state...
Abstract Synchrotron radiation‐based Fourier transform infrared spectroscopy enables access to vibrational information from mid over far even terahertz domains. This may prove critical for the elucidation of fundamental bio‐molecular phenomena including folding‐mediated innate host defence mechanisms. Antimicrobial peptides (AMPs) represent one such phenomena. These are major effector molecules immune system, which favour attack on microbial membranes. AMPs recognise and bind membranes...
Abstract Infrared (IR) hyperspectral imaging is a powerful approach in the field of materials and life sciences. However, for extension to modern sub-diffraction nanoimaging it still remains highly inefficient technique, as acquires data via inherent sequential schemes. Here, we introduce mathematical technique low-rank matrix reconstruction scheme atomic force microscopy-based infrared spectroscopy (AFM-IR), efficient IR nanoimaging. To demonstrate its application potential, chose...
Near-field optical microscopy by means of infrared photocurrent mapping has rapidly developed in recent years. In this letter we introduce a near-field induced contrast mechanism arising when conducting surface, exhibiting magnetic moment, is exposed to nanoscale heat source. The magneto-caloritronic response the sample excitation localized thermal gradient leads determined local state magnetization. By comparing measured electric reference with numerical simulations derive an estimate field...
The low-energy electron storage ring Metrology Light Source (MLS), a dedicated synchrotron radiation source, is in user operation since April 2008 at operating energies ranging from 105 MeV up to 630 MeV. It provides coherent THz when it operated low alpha mode with short bunches. At the MLS, two bending magnet beamlines optimized for MIR and spectral range are operational. We report status of these present first results IR measurements MLS.