A5044829462- Photonic and Optical Devices
- Astro and Planetary Science
- Planetary Science and Exploration
- Optical Coatings and Gratings
- Photonic Crystals and Applications
- Semiconductor Lasers and Optical Devices
- Astrophysics and Star Formation Studies
- Electromagnetic Simulation and Numerical Methods
- Microwave Engineering and Waveguides
- Space Exploration and Technology
- Stellar, planetary, and galactic studies
- Plasmonic and Surface Plasmon Research
- Advanced Fiber Optic Sensors
- Electromagnetic Scattering and Analysis
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Advanced Frequency and Time Standards
- Terahertz technology and applications
- Experimental and Theoretical Physics Studies
- Advanced Antenna and Metasurface Technologies
- Electromagnetic Compatibility and Noise Suppression
- Nonlinear Optical Materials Studies
TU Wien
2024
Austrian Cluster for Tissue Regeneration
2024
University of Hagen
2012-2022
Max Planck Institute for Nuclear Physics
2004-2010
Max Planck Society
2007
University of Hawaii System
2005-2006
University of Potsdam
2006
Friedrich Schiller University Jena
2006
Laboratory for Atmospheric and Space Physics
2006
University of Colorado Boulder
2006
Accurate modeling of photonic devices is essential for the development new, higher performance optical components required by current and future high-bandwidth communications systems. This paper reviews several key techniques such modeling, many which are used in commercial design tools. These include mode-solving techniques, beam propagation method, method lines, finite-difference time-domain technique.
During Cassini's close flyby of Enceladus on 14 July 2005, the High Rate Detector Cosmic Dust Analyzer registered micron-sized dust particles enveloping this satellite. The impact rate peaked about 1 minute before closest approach spacecraft to moon. This asymmetric signature is consistent with a locally enhanced production in south polar region Enceladus. Other Cassini experiments revealed evidence for geophysical activities near Enceladus' pole: high surface temperature and release water...
We present a comparison among several fully-vectorial methods applied to basic scattering problem governed by the physics of electromagnetic interaction between subwavelength apertures in metal film. The modelled structure represents slit-groove silver film deposited on glass substrate. benchmarked methods, all which use in-house developed software, include broad range approaches from finite-element volume-integral and finite-difference time domain various types modal based different...
Investigating the dynamical and physical properties of cosmic dust can reveal a great deal information about both its many sources. Over recent years, several spacecraft (e.g., Cassini, Stardust, Galileo, Ulysses) have successfully characterised interstellar, interplanetary, circumplanetary using variety techniques, including in situ analyses sample return. Charge, mass, velocity measurements are performed either directly (induced charge signals) or indirectly (mass from impact ionisation...
During Cassini's approach to Saturn, the Cosmic Dust Analyser (CDA) discovered streams of tiny (less than 20 nanometers) high-velocity (approximately 100 kilometers per second) dust particles escaping from saturnian system. A fraction these impactors originated outskirts Saturn's dense ring. The CDA time-of-flight mass spectrometer recorded 584 spectra stream particles. consist predominantly oxygen, silicon, and iron, with some evidence water ice, ammonium, perhaps carbon. primarily silicate...
An algorithm which allows the analysis of optical periodic structures with a very large number periods minimum numerical problems is presented, For this purpose stable impedance transfer combined Floquet's theorem. Numerical results for Bragg grating up to 20000 are presented featuring moderate effort.
Algorithms for the determination of eigenmodes and analysis longitudinally varying structures are presented. The media may be anisotropic devices consist an arbitrary number layers or waveguide sections, respectively. Starting with generalized transmission line equations, suitable expressions derived which implemented in method lines, a semianalytical algorithm. To ensure numerical stability, transformation reflection coefficient is performed. Numerical results presented Bragg-grating very...
A comprehensive numerical model for the analysis of vertical-surface emitting-lasers is presented. An optical, electrical, and thermal submodel are introduced. The complete based on method lines. temperature distribution current density calculated in whole structure. optical behavior investigated with a full vectorial wave equation cylindrical coordinates. Multimode effects considered when calculating output power. rate electrons holes used, which includes diffusion recombination inside...
We report an analysis of the Cosmic Dust Analyzer data obtained during interplanetary cruise Cassini spacecraft between Jupiter and Saturn. The cover time period flyby Saturn orbit insertion. Seventeen dust particles on bound unbound (hyperbolic) orbits were also detected, with sizes in submicrometer to micrometer range. Our measurements are compared Pioneer 30 years ago model predictions. Particles have low eccentricities inclinations. Possible sources short‐period family comets circumsolar...
The finite difference expressions for arbitrary positions of the dielectric steps in waveguide structures are derived and inserted into beam propagation algorithm based on method lines (MoL). accuracy these is tested by calculating effective indexes slab waveguides comparing results with analytic solutions. Tapered analyzed as an application this new approach. behavior field presented modal power loss compared other methods.
The performance and accuracy of a number propagative algorithms are compared for the simulation tapered high contrast step index slab waveguides. considered methods include paraxial as well nonparaxial formulations optical field propagation. In particular attention is paid to validity approximation. To test internal consistency various property reciprocity verified it shown that can only be fulfilled if approximation power flux expression using Poynting vector considered. Finally, modeling...