A5070204049- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Photonic and Optical Devices
- Optical Coatings and Gratings
- Crystallography and Radiation Phenomena
- Orbital Angular Momentum in Optics
- Metamaterials and Metasurfaces Applications
- Mechanical and Optical Resonators
- Advanced Fiber Optic Sensors
- Advanced X-ray and CT Imaging
- Advanced Surface Polishing Techniques
- Laser Material Processing Techniques
- Nanofabrication and Lithography Techniques
- Advanced Optical Sensing Technologies
- Digital Holography and Microscopy
- Surface Modification and Superhydrophobicity
- Adaptive optics and wavefront sensing
- Near-Field Optical Microscopy
Deutsches Elektronen-Synchrotron DESY
2023-2025
European X-Ray Free-Electron Laser
2023
Karlsruhe Institute of Technology
2018
RWTH Aachen University
2018
Qingdao University
2013
In this work, we describe the instrumentation used to perform first operando transmission X-ray microscopy (TXM) and simultaneous diffraction of laser melting simulating powder bed fusion on XCS instrument at Linac Coherent Light Source (LCLS) free-electron (XFEL). Our TXM with 40× magnification in regime 11 keV gave spatial resolutions down 940 nm per line pair, effective pixel sizes 206 nm, image integration times <100 fs, frame rates tunable between 2.1 119 ns for two probe frames (0.48...
Generally, nano-scale patterned sapphire substrate (NPSS) has better performance than micro-scale (MPSS) in improving the light extraction efficiency of LEDs. Laser interference lithography (LIL) is one powerful fabrication methods for periodic nanostructures without photo-masks different designs. However, Lloyd's mirror LIL system disadvantage that fabricated patterns are inevitably distorted, especially large-area twodimensional (2D) nanostructures. Herein, we introduce two-beam to...
AbstractA new reflecting polarizing beam splitter (RPBS), based on a metal–multilayer dielectric grating (MMDG), was designed using rigorous coupled wave analysis method and genetic algorithm. The RPBS reflects the TE in −1st order TM 0th for 800 nm. optimized has an extinction ratio of over 20 dB, from 765 nm to 823 nm, large angle, 43.8° 60°. At ratios orders reach maximum 41.0 dB 53.2 respectively. Furthermore, suggests that allows sufficient manufacture tolerance. These results show...
The realization of the Digital Optical Twin (DOT), which is in short digital representation physical state an optical system, particularly useful context automated assembly process systems. During process, system status continuously measured and compared with model. In case deviations between model, latter one adapted to match state. To reach goal described above, a first step measurement/characterization technologies concerning their suitability generate precise twin existing have be...
Recently, cylindrical vector beams have drawn considerable attention for their interesting properties and potential applications in super-resolution optical imaging, trapping manipulating. It's easy to obtain inhomogeneous status of polarization by designing the diffractive elements particularly. With change beams, three dimensional (3D) flattop fields could be obtained. Numerical analysis shows that full width at half maximum proposed 3D light field is nearly 5λ axial distributions. The...
Aberration-free x-ray optics are a prerequisite for nondestructive scanning microscopy with highest spatial resolution in order to understand complex material systems and processes. Nevertheless, due highly challenging manufacturing requirements, even state-of-the-art often still suffer from residual lens aberrations, diffraction-limited performance can only be achieved by inserting additional corrective optical elements. Here, the concept of tailor-made refractive phase plates is expanded...