me Dr. Manfred Hammer
University of Paderborn
Theoretical Electrical Engineering
Warburger Strasse 100
33098 Paderborn

Phone: ++49 (0)5251/60-3560
Fax: ++49 (0)5251/60-3524

Building P1,    room P1.5.17.1
     Universität Paderborn
FG Theoretische Elektrotechnik
Warburger Strasse 100
33098 Paderborn

Tel: 05251/60-3560
Fax: 05251/60-3524

Gebäude P1,    Raum P1.5.17.1
OWTNM 2018

Barbara Hammer, Machine Learning, University of Bielefeld
University of Paderborn, Germany Theoretical Electrical Engineering group SiIO, simulations in integrated optics
Research topics Research topics: Things we have been / are busy with, including a bunch of figures. Keywords: Theoretical photonics, integrated optics, numerical modeling; dielectric waveguide theory, mode solvers; interferometric devices, nonreciprocal integrated optical devices; polarizer / isolator / circulator concepts; microresonator simulations ...
Publications Publications: References to journal papers, book chapters, and contributions to conference proceedings, a list of talks and poster presentations, and links to postscript versions of my PhD- and Diploma theses.
Teaching Teaching: Information about the courses and MSc projects (finished and upcoming) where I am involved in.
Metric - Mode expansion tool for rectangular integrated optical circuits Metric: Tools for semianalytic modeling in integrated optics / photonics, simulations of lossless 2D configurations with rectangular refractive index distributions. Includes a mode solver engine for dielectric multilayer slab waveguides, and solvers for guided-wave Helmholtz (-scattering) problems based on spectral discretizations along one (BEP: bidirectional eigenmode propagation) or two coordinate axes (QUEP: quadridirectional eigenmode propagation). A series of application examples, embedded in the html manual, complements the downloadable, commented C++ sources.
WMM mode solver WMM: A quasianalytic mode solver for rectangular dielectric integrated optical waveguide channels (3D configurations with 2D cross sections), programmed during my PhD period at the Department of Physics, University of Osnabrück, Germany. The html manual includes the downloadable, commented C++ sources, accompanied by several application examples.
OMS - 1D multilayer slab waveguide mode solver - Online ! OMS: A mode solver for optical dielectric multilayer slab waveguides with 1D cross sections. Following the waveguide definition in terms of refractive indices, layer thicknesses, and the vacuum wavelength, the script calculates the propagation constants / effective indices of guided modes and allows to inspect the corresponding optical field patterns. Facilities for evaluating simple parameter scans (modal dispersion properties) are provided. The solver is intended as a basic tool for integrated optics design, in particular for purposes of demonstration.
EIMS - 2D effective index mode solver - Online ! EIMS: Similar to its 1D counterpart, this script calculates and visualizes the guided fields of dielectric integrated optical waveguides with two-dimensional light confinement and weak lateral guiding. Note the remarks on the variant of the effective-index approximation the mode solver relies on.
MuLS - Plane wave reflection at dielectric multilayers - Online solver ! MuLS: A solver for problems of plane wave reflection from dielectric multilayer systems at oblique incidence. Given the stack definition in terms of refractive indices, layer thicknesses, vacuum wavelength, and the angle of incidence, the script calculates reflectance and transmittance properties for s- and p-polarized waves, and allows to inspect the corresponding optical fields. Facilities for evaluating parameter scans / spectra are available. The script can serve as a basic tool for the design of dielectric multilayer coatings / reflectors / filters, in particular for purposes of demonstration.
2-D frequency domain solver for rectangular optical guided-wave scattering problems - Online ! QuEPS: A frequency domain solver for 2-D rectangular optical guided-wave scattering problems. The scalar polarized 2-D Helmholtz equations are addressed, on a rectangular computational domain with transparent boundary conditions that permit guided wave in- and outflux. Following the problem specification in terms of interface positions, a matrix of refractive index values, polarization and wavelength parameters, and guided wave input, the script determines modal output amplitudes (elements of the scattering matrices), and the power levels associated with guided and nonguided directional outgoing waves (transmittances / reflectances, power balance). Facilities for detailed inspection of the optical electromagnetic field are provided, including animations of the harmonic oscillations in time, with options for exporting figures and data.
Wavelength / frequency / energy equivalents WaFE: Conversion between quantities that characterize the propagation of harmonic electromagnetic waves in vacuum. This concerns wavelength, wavenumber, spectroscopic wavenumber, frequency, angular frequency, time period, and photon energy, (mostly) in SI units.
Term evaluation Teval: A script that can evaluate simple C-style expressions. The script knows about the numerical values of some common physical constants, hence it is in particular useful for a certain class of basic exercises in physics courses ...
Links Bookmarks: Links that I find nice or useful or that I once found nice or useful.

15.05.2017  Profile at Google Scholar  Profile at ResearchGate