Ultrafast dynamics of localized light modes. - In: Annalen der Physik, ISSN 1521-3889, Bd. 525 (2013), 1/2, S. 199-204
Multiple coherent scattering gives rise to a variety of localization phenomena. However, the localization of electromagnetic waves is notoriously hard to observe. Here, hotspots found in optical wavefunctions in the visible range in random zinc-oxide nano-needle arrays are discussed. In particular, results from 3D and 2D calculations of light localization in random arrays of dielectric cylinders are compared. While 3D calculations with periodic boundary conditions reproduce various aspects of the experimental results very well, open boundary 2D calculations proof the coexistence of propagating and lossy localized modes showing distinct hot-spots.
http://dx.doi.org/10.1002/andp.201200228
Simulation, parameter estimation and optimization of an industrial-scale evaporation system. - In: Simulation and modeling methodologies, technologies and applications, (2013), S. 71-84
Design and operation of complex industrial systems can be improved based on simulation and optimization using physical process models. However, this endeavor is particularly challenging for hybrid systems, where in addition to the continuous evolution described by differential algebraic equations the dynamic process shows instantaneous switches between different operating modes. In this study, we consider parameter estimation for an industrial evaporation system with discrete mode switches due to phase transitions. Simulation results of the hybrid evaporator model are compared with those of a smooth evaporator model. A smoothing approach is applied in order to modify the hybrid model such that the discrete transitions are integrated into the system of differential algebraic equations. This leads to exclusively smooth trajectories, making the model suitable for parameter estimation to be solved by means of gradient-based optimization methods. The dependence of the parameter estimation results on the smoothing parameter is investigated. Keywords: Parameter estimation, Nonlinear dynamic optimization, Large-scale hybrid systems.
Enhancement of block-block entanglement due to localized impurities in the 1D Fermi-Hubbard model. - In: DPG-Frühjahrstagung, spring meeting of the Section AMOP (SAMOP) with the Divisions Atomic Physics, Extraterrestrial Physics, Mass Spectrometry, Molecular Physics, Plasma Physics, Quantum Optics and Photonics, Short Time-scale Physics, 2012, Q 54.78
Trapping light in random ZnO nanorod arrays - localization of light in space and time. - In: 76th Jahrestagung der DPG (76th annual conference of the DPG) and DPG-Frühjahrstagung (spring meeting) of the Condensed Matter Section (SKM) with further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as well as the DPG working groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, young DPG ; March 25 - 30, 2012, Technische Universität Berlin, 2012, O 3.4
Investigation of parametrizations for the valence band structure of GaN. - In: 76th Jahrestagung der DPG (76th annual conference of the DPG) and DPG-Frühjahrstagung (spring meeting) of the Condensed Matter Section (SKM) with further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as well as the DPG working groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, young DPG ; March 25 - 30, 2012, Technische Universität Berlin, 2012, HL 25.8
Electron spectroscopy study of the interaction of copper with [EMIm]Tf 2 N under the influence of aerobic conditions. - In: 76th Jahrestagung der DPG (76th annual conference of the DPG) and DPG-Frühjahrstagung (spring meeting) of the Condensed Matter Section (SKM) with further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as well as the DPG working groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, young DPG ; March 25 - 30, 2012, Technische Universität Berlin, 2012, CPP 16.32
DFT-reconstructed photoelectron spectra for metals in ionic liquids. - In: 76th Jahrestagung der DPG (76th annual conference of the DPG) and DPG-Frühjahrstagung (spring meeting) of the Condensed Matter Section (SKM) with further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as well as the DPG working groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, young DPG ; March 25 - 30, 2012, Technische Universität Berlin, 2012, CPP 16.46
Coherent control of the electron emission from metal nanotips due to ultrashort laser pulses. - In: 76th Jahrestagung der DPG (76th annual conference of the DPG) and DPG-Frühjahrstagung (spring meeting) of the Condensed Matter Section (SKM) with further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as well as the DPG working groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, young DPG ; March 25 - 30, 2012, Technische Universität Berlin, 2012, O 34.59
Far-field control of optical near-field enhancement. - In: 76th Jahrestagung der DPG (76th annual conference of the DPG) and DPG-Frühjahrstagung (spring meeting) of the Condensed Matter Section (SKM) with further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as well as the DPG working groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, young DPG ; March 25 - 30, 2012, Technische Universität Berlin, 2012, O 34.60
Localization of light-modes in disordered ZnO nanoneedle-arrays. - In: 76th Jahrestagung der DPG (76th annual conference of the DPG) and DPG-Frühjahrstagung (spring meeting) of the Condensed Matter Section (SKM) with further DPG Divisions: Environmental Physics, Microprobes, Radiation and Medical Physics, as well as the DPG working groups: Energy, Equal Opportunities, Industry and Business, Information, Philosophy of Physics, Physics and Disarmament, young DPG ; March 25 - 30, 2012, Technische Universität Berlin, 2012, HL 49.4