Actual research project
3D photonic crystals allow to custom design the photonic density of states and therefore to omit spontaneous emission for certain wavelengths. This opens the possibility to study atom-photon bound states and new relaxation channels, which are not observable in vacuum. We fabricate 3D photonic crystals with complete gaps via different templating methods (e.g. artifical opals, laser direct writing) and subsequent Silicon or Tungsten inversion. PbS quantum dots are used as active medium emitting around 1.5um.
Work: Dept. of Chemistry
1992-1998 studying physics at Universität Karlsruhe (TH) in Germany, focusing on near-field optics and semiconductor physics
1998-2001 Ph.D. student at Universität Karlsruhe (TH) in Germany in Martin Wegener's group. Research topics: low temperature near-field microscopy, influence of disorder on the emission properties and the excitonic energy level statistics in semiconductor quantum wells
2001-2002 PostDoc at the Institute for Nanotechnology at the Forschungszentrum Karlsruhe in Martin Wegener's group. Research topics: characterization of 2D and 3D photonic crystals via white-light interferometry, fabrication of 3D photonic crystals via laser holography and laser direct writing.
2003-… Joint PostDoc at the University of Toronto in the groups of Sajeev John and Geoffrey A. Ozin . Research topics: Thermal and spontaneous emission from 3D photonic crystals, fabrication and characterization of 3D photonic crystals, fabrication and characterization of PbS quantum dots.
List of publications
Computer simulations: Subwavelength resolution with an apertureless SNOM
Parallel computing on Near-field Scanning Optical Microscopy (NSOM)
Computer simulations on near-field scanning optical microscopy: Can subwavelength resolution be obtained using uncoated optical fibre probes?
Depolarization Near-field Scanning Optical Microscopy: Influence of Wavelength and Tip-Shape on the Lateral Resolution
The Depolarization NSOM: Comparison of Experiment and Theory
Near-Field Photoluminescence Imaging of Single Defects in a ZnSe Quantum Well Structure at Low Temperatures
Statistical Analysis of Near-Field Photoluminescence Spectra of Single Ultrathin Layers of CdSe/ZnSe
Autocorrelation spectroscopy on single ultrathin layers of CdSe/ZnSe: hints for a non-thermal distribution of excitons in quantum islands
Hints for a non-thermal distribution of excitons in CdSe/ZnSe quantum islands.
Level repulsion in nano-photoluminescence spectra from single GaAs quantum wells.
Combining a scanning near-field optical microscope with a picosecond streak-camera: Statistical analysis of exciton kinetics in GaAs single quantum wells
Spatial autocorrelation analysis of nanophotoluminescence images of single GaAs quantum wells.
Investigations on phonon-assisted relaxation mechanisms in CdSe/ZnSe quantum islands using time-resolved near-field spectroscopy.
Influence of the quantum island distribution on relaxation of localized excitons in CdSe/ZnSe heterostructures.
Autocorrelation spectroscopy on single GaInAs/GaAs quantum wells.
Three-dimensional face-centered-cubic photonic crystal templates by laser holography: fabrication, optical characterization, and band-structure calculations.
Diffraction properties of two-dimensional photonic crystals.
Poster: Computer simulations: subwavelength resolution with an apertureless SNOM
Poster: Computersimulationen: Abbildungseigenschaften des Internal-Reflection SNOM
Poster: Parallelrechner in der optischen Nahfeldmikroskopie
Poster: Computer simulations and experiments on the Depolarization-NSOM
Talk: The Depolarization NSOM: Subwavelength resolution with uncoated optical fiber probes
Talk: Das Depolarisations SNOM: Nahfeldauflösung mit unbedampften Glasfaserspitzen
Talk: Nanocharakterisierung mit dem Nahfeldmikroskop
Talk: Abbildung einzelner Defekte in einer ZnSe Quantentrogstruktur mittels Nahfeld-Photolumineszenz bei tiefen Temperaturen
Talk: Imaging of single defects in a ZnSe Quantum Well Structure with Nanophotoluminescence at low temperatures
Poster: Statistical analysis of near-field photoluminescence spectra of ultrathin layers of CdSe/ZnSe
Poster: Autokorrelationsspektroskopie an CdSe/ZnSe: Hinweise auf eine nicht-thermische Exzitonenverteilung in Quanten-Inseln
Talk: Optische Nahfeld-Autokorrelationsspektroskopie an GaAs Einzelquantenfilmen
Talk: Autocorrelation optical near-field spectroscopy of single GaAs quantum wells
Poster: Level repulsion in nanophotoluminescence spectra from single GaAs quantum wells
Talk: Polarisation Dependent Coupling in Ring Resonator Filters
Poster: Fabrication of 3D fcc Photonic Crystal Templates by Holography
Talk: Angle- and spectrally-resolved Bragg scattering on two-dimensional silicon-based photonic crystals