D. Stehr

TL;DR: The studies pave the way for quantum-dot terahertz device development, providing the fundamental knowledge of carrier relaxation times required for optimum device design.

TL;DR: The imaging of ferroelectric domains in BaTiO3 is demonstrated using an infrared-emitting free-electron laser as a tunable optical source for scattering scanning near-field optical microscopy and spectroscopy, showing that the orientation of the dielectric tensor with respect to the sample surface has a clear influence on the near- field signal.

TL;DR: Terahertz absorption and transmission spectra of broadband terahertz pulses are measured to probe the intersubband response of an optically excited quantum-well heterostructure and display strong Fano signatures due to the phase sensitive superposition of ponderomotive and tera hertz currents.

TL;DR: In this paper, a tunable free-electron laser and a scattering near-field optical microscope were used to investigate a phonon resonance in the infrared regime of a birefringent crystal.

TL;DR: This work uses table-top Ti:sapphire lasers and a free-electron laser emitting ps pulses as excitation sources and a streak camera coupled to a spectrometer for detection for time and wavelength resolved spectroscopy.