Dr. Stephan Winnerl

Head Spectroscopy
Phone: +49 351 260 3522


6-7.07.2023 | FWIH retreat has taken place in Neukirch/Lausitz

05.07.2023 | Our paper about pump-probe spectroscopy of BaFe2As2 under high pressures and low temperatures has been picked as an Editors' Suggestion.

09.06.2023 | FWIH reunion of present and former members

orangener PfeilBachelor, Master, and Doctoral Theses

We are continuously looking for students to join our topics. If you are interested, please get in touch with the contact person listed or with Dr. Stephan Winnerl.

Department of Spectroscopy (FWIH)

Research Topics

  • Optical investigations of novel materials in the visible, infrared, and terahertz regimes
  • Low-dimensional semiconductor structures: quantum wells, heterostructures, superlattices, quantum dots, graphene and other twodimensional semiconductors (monolayer transition metal dichalcogenides), topological insulators
  • Dynamical processes on femtosecond and picosecond time scales
  • Semiconductor electrons and excitons in strong terahertz fields
  • Terahertz emitters and detectors
  • Ultrafast optoelectronic components
  • Molecular beam epitaxy of III-V nanowires
  • Phase transitions in transition metal oxides under high pressure
  • Correlation effects kagome metals

Characterization Methods

  • Terahertz time-domain spectroscopy
  • Nonlinear laser spectroscopy, pump-probe, four-wave mixing
  • FTIR spectroscopy
  • Raman spectroscopy
  • Photoluminescence, electroluminescence
  • Time-resolved photoluminescence
  • Infrared and terahertz near-field microscopy

Time-resolved optical experiments are performed with table-top femtosecond lasers (Ti:sapphire oscillators, amplifiers, OPG/OPA, THz emitters) and with the free-electron laser at ELBE. The latter offers unique possibilities for time-resolved spectroscopy in the mid- and far-infrared regimes, in particular for investigations on semiconductors and their nanostructures. Synchronization of table-top femtosecond lasers to the free-electron laser is also possible (e. g, for two-color experiments). The department is also involved in the application of these measurement techniques at the Dresden High Magnetic Field Laboratory.